diff --git a/.pylintrc b/.pylintrc
new file mode 100644
index 0000000..3585c5a
--- /dev/null
+++ b/.pylintrc
@@ -0,0 +1,582 @@
+[MASTER]
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code.
+extension-pkg-whitelist=
+
+# Add files or directories to the blacklist. They should be base names, not
+# paths.
+ignore=CVS,test
+
+# Add files or directories matching the regex patterns to the blacklist. The
+# regex matches against base names, not paths.
+ignore-patterns=
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Use multiple processes to speed up Pylint. Specifying 0 will auto-detect the
+# number of processors available to use.
+jobs=1
+
+# Control the amount of potential inferred values when inferring a single
+# object. This can help the performance when dealing with large functions or
+# complex, nested conditions.
+limit-inference-results=100
+
+# List of plugins (as comma separated values of python module names) to load,
+# usually to register additional checkers.
+load-plugins=
+
+# Pickle collected data for later comparisons.
+persistent=yes
+
+# Specify a configuration file.
+#rcfile=
+
+# When enabled, pylint would attempt to guess common misconfiguration and emit
+# user-friendly hints instead of false-positive error messages.
+suggestion-mode=yes
+
+# Allow loading of arbitrary C extensions. Extensions are imported into the
+# active Python interpreter and may run arbitrary code.
+unsafe-load-any-extension=no
+
+
+[MESSAGES CONTROL]
+
+# Only show warnings with the listed confidence levels. Leave empty to show
+# all. Valid levels: HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED.
+confidence=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once). You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable=print-statement,
+        parameter-unpacking,
+        unpacking-in-except,
+        old-raise-syntax,
+        backtick,
+        long-suffix,
+        old-ne-operator,
+        old-octal-literal,
+        import-star-module-level,
+        non-ascii-bytes-literal,
+        raw-checker-failed,
+        bad-inline-option,
+        locally-disabled,
+        file-ignored,
+        suppressed-message,
+        useless-suppression,
+        deprecated-pragma,
+        use-symbolic-message-instead,
+        apply-builtin,
+        basestring-builtin,
+        buffer-builtin,
+        cmp-builtin,
+        coerce-builtin,
+        execfile-builtin,
+        file-builtin,
+        long-builtin,
+        raw_input-builtin,
+        reduce-builtin,
+        standarderror-builtin,
+        unicode-builtin,
+        xrange-builtin,
+        coerce-method,
+        delslice-method,
+        getslice-method,
+        setslice-method,
+        no-absolute-import,
+        old-division,
+        dict-iter-method,
+        dict-view-method,
+        next-method-called,
+        metaclass-assignment,
+        indexing-exception,
+        raising-string,
+        reload-builtin,
+        oct-method,
+        hex-method,
+        nonzero-method,
+        cmp-method,
+        input-builtin,
+        round-builtin,
+        intern-builtin,
+        unichr-builtin,
+        map-builtin-not-iterating,
+        zip-builtin-not-iterating,
+        range-builtin-not-iterating,
+        filter-builtin-not-iterating,
+        using-cmp-argument,
+        eq-without-hash,
+        div-method,
+        idiv-method,
+        rdiv-method,
+        exception-message-attribute,
+        invalid-str-codec,
+        sys-max-int,
+        bad-python3-import,
+        deprecated-string-function,
+        deprecated-str-translate-call,
+        deprecated-itertools-function,
+        deprecated-types-field,
+        next-method-defined,
+        dict-items-not-iterating,
+        dict-keys-not-iterating,
+        dict-values-not-iterating,
+        deprecated-operator-function,
+        deprecated-urllib-function,
+        xreadlines-attribute,
+        deprecated-sys-function,
+        exception-escape,
+        comprehension-escape,
+        missing-module-docstring,
+
+# Enable the message, report, category or checker with the given id(s). You can
+# either give multiple identifier separated by comma (,) or put this option
+# multiple time (only on the command line, not in the configuration file where
+# it should appear only once). See also the "--disable" option for examples.
+enable=c-extension-no-member
+
+
+[REPORTS]
+
+# Python expression which should return a score less than or equal to 10. You
+# have access to the variables 'error', 'warning', 'refactor', and 'convention'
+# which contain the number of messages in each category, as well as 'statement'
+# which is the total number of statements analyzed. This score is used by the
+# global evaluation report (RP0004).
+evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / statement) * 10)
+
+# Template used to display messages. This is a python new-style format string
+# used to format the message information. See doc for all details.
+#msg-template=
+
+# Set the output format. Available formats are text, parseable, colorized, json
+# and msvs (visual studio). You can also give a reporter class, e.g.
+# mypackage.mymodule.MyReporterClass.
+output-format=text
+
+# Tells whether to display a full report or only the messages.
+reports=no
+
+# Activate the evaluation score.
+score=yes
+
+
+[REFACTORING]
+
+# Maximum number of nested blocks for function / method body
+max-nested-blocks=5
+
+# Complete name of functions that never returns. When checking for
+# inconsistent-return-statements if a never returning function is called then
+# it will be considered as an explicit return statement and no message will be
+# printed.
+never-returning-functions=sys.exit
+
+
+[SPELLING]
+
+# Limits count of emitted suggestions for spelling mistakes.
+max-spelling-suggestions=4
+
+# Spelling dictionary name. Available dictionaries: none. To make it work,
+# install the python-enchant package.
+spelling-dict=
+
+# List of comma separated words that should not be checked.
+spelling-ignore-words=
+
+# A path to a file that contains the private dictionary; one word per line.
+spelling-private-dict-file=
+
+# Tells whether to store unknown words to the private dictionary (see the
+# --spelling-private-dict-file option) instead of raising a message.
+spelling-store-unknown-words=no
+
+
+[MISCELLANEOUS]
+
+# List of note tags to take in consideration, separated by a comma.
+notes=FIXME,
+      XXX,
+      TODO
+
+
+[SIMILARITIES]
+
+# Ignore comments when computing similarities.
+ignore-comments=yes
+
+# Ignore docstrings when computing similarities.
+ignore-docstrings=yes
+
+# Ignore imports when computing similarities.
+ignore-imports=no
+
+# Minimum lines number of a similarity.
+min-similarity-lines=4
+
+
+[TYPECHECK]
+
+# List of decorators that produce context managers, such as
+# contextlib.contextmanager. Add to this list to register other decorators that
+# produce valid context managers.
+contextmanager-decorators=contextlib.contextmanager
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E1101 when accessed. Python regular
+# expressions are accepted.
+generated-members=
+
+# Tells whether missing members accessed in mixin class should be ignored. A
+# mixin class is detected if its name ends with "mixin" (case insensitive).
+ignore-mixin-members=yes
+
+# Tells whether to warn about missing members when the owner of the attribute
+# is inferred to be None.
+ignore-none=yes
+
+# This flag controls whether pylint should warn about no-member and similar
+# checks whenever an opaque object is returned when inferring. The inference
+# can return multiple potential results while evaluating a Python object, but
+# some branches might not be evaluated, which results in partial inference. In
+# that case, it might be useful to still emit no-member and other checks for
+# the rest of the inferred objects.
+ignore-on-opaque-inference=yes
+
+# List of class names for which member attributes should not be checked (useful
+# for classes with dynamically set attributes). This supports the use of
+# qualified names.
+ignored-classes=optparse.Values,thread._local,_thread._local
+
+# List of module names for which member attributes should not be checked
+# (useful for modules/projects where namespaces are manipulated during runtime
+# and thus existing member attributes cannot be deduced by static analysis). It
+# supports qualified module names, as well as Unix pattern matching.
+ignored-modules=
+
+# Show a hint with possible names when a member name was not found. The aspect
+# of finding the hint is based on edit distance.
+missing-member-hint=yes
+
+# The minimum edit distance a name should have in order to be considered a
+# similar match for a missing member name.
+missing-member-hint-distance=1
+
+# The total number of similar names that should be taken in consideration when
+# showing a hint for a missing member.
+missing-member-max-choices=1
+
+# List of decorators that change the signature of a decorated function.
+signature-mutators=
+
+
+[BASIC]
+
+# Naming style matching correct argument names.
+argument-naming-style=snake_case
+
+# Regular expression matching correct argument names. Overrides argument-
+# naming-style.
+#argument-rgx=
+
+# Naming style matching correct attribute names.
+attr-naming-style=snake_case
+
+# Regular expression matching correct attribute names. Overrides attr-naming-
+# style.
+#attr-rgx=
+
+# Bad variable names which should always be refused, separated by a comma.
+bad-names=foo,
+          bar,
+          baz,
+          toto,
+          tutu,
+          tata
+
+# Naming style matching correct class attribute names.
+class-attribute-naming-style=any
+
+# Regular expression matching correct class attribute names. Overrides class-
+# attribute-naming-style.
+#class-attribute-rgx=
+
+# Naming style matching correct class names.
+class-naming-style=PascalCase
+
+# Regular expression matching correct class names. Overrides class-naming-
+# style.
+#class-rgx=
+
+# Naming style matching correct constant names.
+const-naming-style=UPPER_CASE
+
+# Regular expression matching correct constant names. Overrides const-naming-
+# style.
+#const-rgx=
+
+# Minimum line length for functions/classes that require docstrings, shorter
+# ones are exempt.
+docstring-min-length=-1
+
+# Naming style matching correct function names.
+function-naming-style=snake_case
+
+# Regular expression matching correct function names. Overrides function-
+# naming-style.
+#function-rgx=
+
+# Good variable names which should always be accepted, separated by a comma.
+good-names=i,
+           j,
+           k,
+           ex,
+           Run,
+           _
+
+# Include a hint for the correct naming format with invalid-name.
+include-naming-hint=no
+
+# Naming style matching correct inline iteration names.
+inlinevar-naming-style=any
+
+# Regular expression matching correct inline iteration names. Overrides
+# inlinevar-naming-style.
+#inlinevar-rgx=
+
+# Naming style matching correct method names.
+method-naming-style=snake_case
+
+# Regular expression matching correct method names. Overrides method-naming-
+# style.
+#method-rgx=
+
+# Naming style matching correct module names.
+module-naming-style=snake_case
+
+# Regular expression matching correct module names. Overrides module-naming-
+# style.
+#module-rgx=
+
+# Colon-delimited sets of names that determine each other's naming style when
+# the name regexes allow several styles.
+name-group=
+
+# Regular expression which should only match function or class names that do
+# not require a docstring.
+no-docstring-rgx=^_
+
+# List of decorators that produce properties, such as abc.abstractproperty. Add
+# to this list to register other decorators that produce valid properties.
+# These decorators are taken in consideration only for invalid-name.
+property-classes=abc.abstractproperty
+
+# Naming style matching correct variable names.
+variable-naming-style=snake_case
+
+# Regular expression matching correct variable names. Overrides variable-
+# naming-style.
+#variable-rgx=
+
+
+[STRING]
+
+# This flag controls whether the implicit-str-concat-in-sequence should
+# generate a warning on implicit string concatenation in sequences defined over
+# several lines.
+check-str-concat-over-line-jumps=no
+
+
+[LOGGING]
+
+# Format style used to check logging format string. `old` means using %
+# formatting, `new` is for `{}` formatting,and `fstr` is for f-strings.
+logging-format-style=old
+
+# Logging modules to check that the string format arguments are in logging
+# function parameter format.
+logging-modules=logging
+
+
+[VARIABLES]
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid defining new builtins when possible.
+additional-builtins=
+
+# Tells whether unused global variables should be treated as a violation.
+allow-global-unused-variables=yes
+
+# List of strings which can identify a callback function by name. A callback
+# name must start or end with one of those strings.
+callbacks=cb_,
+          _cb
+
+# A regular expression matching the name of dummy variables (i.e. expected to
+# not be used).
+dummy-variables-rgx=_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy|^ignored_|^unused_
+
+# Argument names that match this expression will be ignored. Default to name
+# with leading underscore.
+ignored-argument-names=_.*|^ignored_|^unused_
+
+# Tells whether we should check for unused import in __init__ files.
+init-import=no
+
+# List of qualified module names which can have objects that can redefine
+# builtins.
+redefining-builtins-modules=six.moves,past.builtins,future.builtins,builtins,io
+
+
+[FORMAT]
+
+# Expected format of line ending, e.g. empty (any line ending), LF or CRLF.
+expected-line-ending-format=
+
+# Regexp for a line that is allowed to be longer than the limit.
+ignore-long-lines=^\s*(# )?<?https?://\S+>?$
+
+# Number of spaces of indent required inside a hanging or continued line.
+indent-after-paren=4
+
+# String used as indentation unit. This is usually "    " (4 spaces) or "\t" (1
+# tab).
+indent-string='    '
+
+# Maximum number of characters on a single line.
+max-line-length=120
+
+# Maximum number of lines in a module.
+max-module-lines=1000
+
+# List of optional constructs for which whitespace checking is disabled. `dict-
+# separator` is used to allow tabulation in dicts, etc.: {1  : 1,\n222: 2}.
+# `trailing-comma` allows a space between comma and closing bracket: (a, ).
+# `empty-line` allows space-only lines.
+no-space-check=trailing-comma,
+               dict-separator
+
+# Allow the body of a class to be on the same line as the declaration if body
+# contains single statement.
+single-line-class-stmt=no
+
+# Allow the body of an if to be on the same line as the test if there is no
+# else.
+single-line-if-stmt=no
+
+
+[DESIGN]
+
+# Maximum number of arguments for function / method.
+max-args=5
+
+# Maximum number of attributes for a class (see R0902).
+max-attributes=7
+
+# Maximum number of boolean expressions in an if statement (see R0916).
+max-bool-expr=5
+
+# Maximum number of branch for function / method body.
+max-branches=12
+
+# Maximum number of locals for function / method body.
+max-locals=15
+
+# Maximum number of parents for a class (see R0901).
+max-parents=7
+
+# Maximum number of public methods for a class (see R0904).
+max-public-methods=20
+
+# Maximum number of return / yield for function / method body.
+max-returns=6
+
+# Maximum number of statements in function / method body.
+max-statements=50
+
+# Minimum number of public methods for a class (see R0903).
+min-public-methods=2
+
+
+[IMPORTS]
+
+# List of modules that can be imported at any level, not just the top level
+# one.
+allow-any-import-level=
+
+# Allow wildcard imports from modules that define __all__.
+allow-wildcard-with-all=no
+
+# Analyse import fallback blocks. This can be used to support both Python 2 and
+# 3 compatible code, which means that the block might have code that exists
+# only in one or another interpreter, leading to false positives when analysed.
+analyse-fallback-blocks=no
+
+# Deprecated modules which should not be used, separated by a comma.
+deprecated-modules=optparse,tkinter.tix
+
+# Create a graph of external dependencies in the given file (report RP0402 must
+# not be disabled).
+ext-import-graph=
+
+# Create a graph of every (i.e. internal and external) dependencies in the
+# given file (report RP0402 must not be disabled).
+import-graph=
+
+# Create a graph of internal dependencies in the given file (report RP0402 must
+# not be disabled).
+int-import-graph=
+
+# Force import order to recognize a module as part of the standard
+# compatibility libraries.
+known-standard-library=
+
+# Force import order to recognize a module as part of a third party library.
+known-third-party=enchant
+
+# Couples of modules and preferred modules, separated by a comma.
+preferred-modules=
+
+
+[CLASSES]
+
+# List of method names used to declare (i.e. assign) instance attributes.
+defining-attr-methods=__init__,
+                      __new__,
+                      setUp,
+                      __post_init__
+
+# List of member names, which should be excluded from the protected access
+# warning.
+exclude-protected=_asdict,
+                  _fields,
+                  _replace,
+                  _source,
+                  _make
+
+# List of valid names for the first argument in a class method.
+valid-classmethod-first-arg=cls
+
+# List of valid names for the first argument in a metaclass class method.
+valid-metaclass-classmethod-first-arg=cls
+
+
+[EXCEPTIONS]
+
+# Exceptions that will emit a warning when being caught. Defaults to
+# "BaseException, Exception".
+overgeneral-exceptions=BaseException,
+                       Exception
diff --git a/Makefile b/Makefile
index 13a968e..059ab77 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,8 @@ test: ## Run tests
 	@pytest
 	@flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude venv
 	@flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127  --exclude venv
+	@pylint fmi_weather_client
+	@pylint fmi_weather_client/parsers
 
 clean: ## Clean build and dist directories
 	@rm -rf ./build ./dist ./fmi_weather_client.egg-info
diff --git a/example.py b/example.py
index 21c5e77..556e43b 100644
--- a/example.py
+++ b/example.py
@@ -2,10 +2,10 @@
 from fmi_weather_client.models import Forecast, Weather, WeatherData
 
 
-def print_weather(observation: Weather):
-    print(observation.place)
-    print("Location: %s, %s" % (observation.lat, observation.lon))
-    print_weather_data(observation.data)
+def print_weather(weather: Weather):
+    print(weather.place)
+    print("Location: %s, %s" % (weather.lat, weather.lon))
+    print_weather_data(weather.data)
     print(" ")
 
 
@@ -18,11 +18,11 @@ def print_forecast(station_forecast: Forecast):
 
 
 def print_weather_data(weather: WeatherData):
-    print("  Timestamp: %s" % weather.time)
-    print("  Temperature: %s" % weather.temperature)
-    print("  Humidity: %s" % weather.humidity)
-    print("  Wind speed: %s" % weather.wind_speed)
-    print("  Cloud cover: %s" % weather.cloud_cover)
+    print(f"  Timestamp: {weather.time}")
+    print(f"  Temperature: {weather.temperature}")
+    print(f"  Humidity: {weather.humidity}")
+    print(f"  Wind speed: {weather.wind_speed}")
+    print(f"  Cloud cover: {weather.cloud_cover}")
 
 
 weather1 = fmi_weather_client.weather_by_coordinates(60.170998, 24.941325)
diff --git a/fmi_weather_client/__init__.py b/fmi_weather_client/__init__.py
index 944b3ca..162eeef 100644
--- a/fmi_weather_client/__init__.py
+++ b/fmi_weather_client/__init__.py
@@ -28,10 +28,7 @@ async def async_weather_by_coordinates(lat: float, lon: float) -> Weather:
     :return: Latest weather information
     """
     loop = asyncio.get_event_loop()
-    response = await loop.run_in_executor(None, http.request_weather_by_coordinates, lat, lon)
-    forecast = forecast_parser.parse_forecast(response)
-    weather_state = forecast.forecasts[-1]
-    return Weather(forecast.place, forecast.lat, forecast.lon, weather_state)
+    return await loop.run_in_executor(None, weather_by_coordinates, lat, lon)
 
 
 def weather_by_place_name(name: str) -> Weather:
@@ -55,10 +52,7 @@ async def async_weather_by_place_name(name: str) -> Weather:
     :return: Latest weather information
     """
     loop = asyncio.get_event_loop()
-    response = await loop.run_in_executor(None, http.request_weather_by_place, name)
-    forecast = forecast_parser.parse_forecast(response)
-    weather_state = forecast.forecasts[-1]
-    return Weather(forecast.place, forecast.lat, forecast.lon, weather_state)
+    return await loop.run_in_executor(None, weather_by_place_name, name)
 
 
 def forecast_by_place_name(name: str, timestep_hours: int = 24):
@@ -80,8 +74,7 @@ async def async_forecast_by_place_name(name: str, timestep_hours: int = 24):
     :return: Latest forecast
     """
     loop = asyncio.get_event_loop()
-    response = await loop.run_in_executor(None, http.request_forecast_by_place, name, timestep_hours)
-    return forecast_parser.parse_forecast(response)
+    return await loop.run_in_executor(None, forecast_by_place_name, name, timestep_hours)
 
 
 def forecast_by_coordinates(lat: float, lon: float, timestep_hours: int = 24):
@@ -105,5 +98,4 @@ async def async_forecast_by_coordinates(lat: float, lon: float, timestep_hours:
     :return: Latest forecast
     """
     loop = asyncio.get_event_loop()
-    response = await loop.run_in_executor(None, http.request_forecast_by_coordinates, lat, lon, timestep_hours)
-    return forecast_parser.parse_forecast(response)
+    return await loop.run_in_executor(None, forecast_by_coordinates, lat, lon, timestep_hours)
diff --git a/fmi_weather_client/errors.py b/fmi_weather_client/errors.py
index fbdda50..e057886 100644
--- a/fmi_weather_client/errors.py
+++ b/fmi_weather_client/errors.py
@@ -1,6 +1,6 @@
 class NoDataAvailableError(Exception):
-    pass
+    """Represents data not available error"""
 
 
 class ServiceError(Exception):
-    pass
+    """Represents unknown FMI service error"""
diff --git a/fmi_weather_client/http.py b/fmi_weather_client/http.py
index bdf0861..8be2daa 100644
--- a/fmi_weather_client/http.py
+++ b/fmi_weather_client/http.py
@@ -1,5 +1,6 @@
 import logging
 from datetime import datetime, timedelta, timezone
+from enum import Enum
 from typing import Any, Dict, Optional
 
 import requests
@@ -9,6 +10,12 @@
 _LOGGER = logging.getLogger(__name__)
 
 
+class RequestType(Enum):
+    """Possible request types"""
+    WEATHER = 0
+    FORECAST = 1
+
+
 def request_weather_by_coordinates(lat: float, lon: float) -> str:
     """
     Get the latest weather information by coordinates.
@@ -17,9 +24,7 @@ def request_weather_by_coordinates(lat: float, lon: float) -> str:
     :param lon: Longitude (e.g. 62.39758)
     :return: Latest weather information
     """
-    end_time = datetime.utcnow().replace(tzinfo=timezone.utc)
-    start_time = end_time - timedelta(minutes=10)
-    params = _create_params(start_time, end_time, 10, lat=lat, lon=lon)
+    params = _create_params(RequestType.WEATHER, 10, lat=lat, lon=lon)
     return _send_request(params)
 
 
@@ -30,9 +35,7 @@ def request_weather_by_place(place: str) -> str:
     :param place: Place name (e.g. Kaisaniemi, Helsinki)
     :return: Latest weather information
     """
-    end_time = datetime.utcnow().replace(tzinfo=timezone.utc)
-    start_time = end_time - timedelta(minutes=10)
-    params = _create_params(start_time, end_time, 10, place=place)
+    params = _create_params(RequestType.WEATHER, 10, place=place)
     return _send_request(params)
 
 
@@ -45,10 +48,8 @@ def request_forecast_by_coordinates(lat: float, lon: float, timestep_hours: int
     :param timestep_hours: Forecast steps in hours
     :return: Forecast response
     """
-    start_time = datetime.utcnow().replace(tzinfo=timezone.utc)
-    end_time = start_time + timedelta(days=4)
-    timestep = timestep_hours * 60
-    params = _create_params(start_time, end_time, timestep, lat=lat, lon=lon)
+    timestep_minutes = timestep_hours * 60
+    params = _create_params(RequestType.FORECAST, timestep_minutes, lat=lat, lon=lon)
     return _send_request(params)
 
 
@@ -60,23 +61,18 @@ def request_forecast_by_place(place: str, timestep_hours: int = 24) -> str:
     :param timestep_hours: Forecast steps in hours
     :return: Forecast response
     """
-    start_time = datetime.utcnow().replace(tzinfo=timezone.utc)
-    end_time = start_time + timedelta(days=4)
-    timestep = timestep_hours * 60
-    params = _create_params(start_time, end_time, timestep, place=place)
+    timestep_minutes = timestep_hours * 60
+    params = _create_params(RequestType.FORECAST, timestep_minutes, place=place)
     return _send_request(params)
 
 
-def _create_params(start_time: datetime,
-                   end_time: datetime,
+def _create_params(request_type: RequestType,
                    timestep_minutes: int,
                    place: Optional[str] = None,
                    lat: Optional[float] = None,
                    lon: Optional[float] = None) -> Dict[str, Any]:
     """
     Create query parameters
-    :param start_time: Start datetime
-    :param end_time: End datetime
     :param timestep_minutes: Timestamp minutes
     :param place: Place name
     :param lat: Latitude
@@ -87,6 +83,15 @@ def _create_params(start_time: datetime,
     if place is None and lat is None and lon is None:
         raise Exception("Missing location parameter")
 
+    if request_type is RequestType.WEATHER:
+        end_time = datetime.utcnow().replace(tzinfo=timezone.utc)
+        start_time = end_time - timedelta(minutes=10)
+    elif request_type is RequestType.FORECAST:
+        start_time = datetime.utcnow().replace(tzinfo=timezone.utc)
+        end_time = start_time + timedelta(days=4)
+    else:
+        raise Exception(f"Invalid request_type {request_type}")
+
     params = {
         'service': 'WFS',
         'version': '2.0.0',
@@ -114,11 +119,11 @@ def _send_request(params: Dict[str, Any]) -> str:
     """
     url = 'http://opendata.fmi.fi/wfs'
 
-    _LOGGER.debug(f"Sending GET to {url} with parameters: {params}")
+    _LOGGER.debug("Sending GET to %s with parameters: %s", url, params)
     response = requests.get(url, params=params)
 
     if response.status_code >= 500:
         raise ServiceError("Invalid FMI service response", {'status_code': response.status_code, 'body': response.text})
 
-    _LOGGER.debug(f"Received a response from FMI in {response.elapsed.microseconds / 1000} ms", )
+    _LOGGER.debug("Received a response from FMI in %s ms", response.elapsed.microseconds / 1000)
     return response.text
diff --git a/fmi_weather_client/models.py b/fmi_weather_client/models.py
index a734289..e664b1f 100644
--- a/fmi_weather_client/models.py
+++ b/fmi_weather_client/models.py
@@ -1,91 +1,78 @@
 from datetime import datetime
-from typing import Dict, List, Optional
+from typing import List, Optional, NamedTuple
 
 
-class FMIPlace:
-    def __init__(self, name: str, lat: float, lon: float):
-        self.name: str = name
-        self.lat: float = lat
-        self.lon: float = lon
+class FMIPlace(NamedTuple):
+    """Represent a place in FMI response"""
+    name: str
+    lat: float
+    lon: float
 
     def __str__(self):
         return f"{self.name} ({self.lat}, {self.lon})"
 
 
-class Value:
-    def __init__(self, value: Optional[float], unit: str):
-        self.value: Optional[float] = value
-        self.unit: str = unit
+class Value(NamedTuple):
+    """Represents a weather value"""
+    value: Optional[float]
+    unit: str
 
     def __str__(self):
         return f"{self.value} {self.unit}"
 
 
-class WeatherData:
-    def __init__(self, timestamp: datetime, values: Dict[str, float]):
-
-        def to_value(o: Dict[str, float], variable_name: str, unit: str) -> Value:
-            value = o.get(variable_name, None)
-            return Value(value, unit)
-
-        self.time: datetime = timestamp
-
-        self.temperature: Value = to_value(values, 'Temperature', '°C')
-        self.dew_point: Value = to_value(values, 'DewPoint', '°C')
-
-        self.pressure: Value = to_value(values, 'Pressure', 'hPa')
-        self.humidity: Value = to_value(values, 'Humidity', '%')
-
-        self.wind_direction: Value = to_value(values, 'WindDirection', '°')
-        self.wind_speed: Value = to_value(values, 'WindSpeedMS', 'm/s')
-        self.wind_u_component: Value = to_value(values, 'WindUMS', 'm/s')
-        self.wind_v_component: Value = to_value(values, 'WindVMS', 'm/s')
-        self.wind_max: Value = to_value(values, 'MaximumWind', 'm/s')  # Max 10 min average
-        self.wind_gust: Value = to_value(values, 'WindGust', 'm/s')  # Max 3 sec average
-
-        self.symbol: Value = to_value(values, 'WeatherSymbol3', '')
-        self.cloud_cover: Value = to_value(values, 'TotalCloudCover', '%')
-
-        self.cloud_low_cover: Value = to_value(values, 'LowCloudCover', '%')
-        self.cloud_mid_cover: Value = to_value(values, 'MediumCloudCover', '%')
-        self.cloud_high_cover: Value = to_value(values, 'HighCloudCover', '%')
-
-        # Amount of rain in the past 1h
-        self.precipitation_amount: Value = to_value(values, 'Precipitation1h', 'mm/h')
-
-        # No idea what this is since it is missing the time
-        # self.precipitation_amount: Value = to_value(values, 'PrecipitationAmount', 'mm')
-
-        # Short wave radiation (light, UV) accumulation
-        self.radiation_short_wave_acc: Value = to_value(values, 'RadiationGlobalAccumulation', 'J/m²')
-
-        # Short wave radiation (light, UV) net accumulation on the surface
-        self.radiation_short_wave_surface_net_acc: Value = to_value(values, 'RadiationNetSurfaceSWAccumulation', 'J/m²')
-
-        # Long wave radiation (heat, infrared) accumulation
-        self.radiation_long_wave_acc: Value = to_value(values, 'RadiationLWAccumulation', 'J/m²')
-
-        # Long wave radiation (light, UV) net accumulation on the surface
-        self.radiation_long_wave_surface_net_acc: Value = to_value(values, 'RadiationNetSurfaceLWAccumulation', 'J/m²')
-
-        # Diffused short wave
-        self.radiation_short_wave_diff_surface_acc: Value = to_value(values, 'RadiationDiffuseAccumulation', 'J/m²')
-
-        self.geopotential_height: Value = to_value(values, 'GeopHeight', 'm')
-        self.land_sea_mask: Value = to_value(values, 'LandSeaMask', '')
-
-
-class Weather:
-    def __init__(self, place: str, lat: float, lon: float, weather_data: WeatherData):
-        self.place: str = place
-        self.lat: float = lat
-        self.lon: float = lon
-        self.data: WeatherData = weather_data
-
-
-class Forecast:
-    def __init__(self, place: str, lat: float, lon: float, forecasts: List[WeatherData]):
-        self.place: str = place
-        self.lat: float = lat
-        self.lon: float = lon
-        self.forecasts: List[WeatherData] = forecasts
+class WeatherData(NamedTuple):
+    """Represents a weather"""
+    time: datetime
+    temperature: Value
+    dew_point: Value
+    pressure: Value
+    humidity: Value
+    wind_direction: Value
+    wind_speed: Value
+    wind_u_component: Value
+    wind_v_component: Value
+    wind_max: Value  # Max 10 minutes average
+    wind_gust: Value  # Max 3 seconds average
+    symbol: Value
+    cloud_cover: Value
+    cloud_low_cover: Value
+    cloud_mid_cover: Value
+    cloud_high_cover: Value
+
+    # Amount of rain in the past 1h
+    precipitation_amount: Value
+
+    # Short wave radiation (light, UV) accumulation
+    radiation_short_wave_acc: Value
+
+    # Short wave radiation (light, UV) net accumulation on the surface
+    radiation_short_wave_surface_net_acc: Value
+
+    # Long wave radiation (heat, infrared) accumulation
+    radiation_long_wave_acc: Value
+
+    # Long wave radiation (light, UV) net accumulation on the surface
+    radiation_long_wave_surface_net_acc: Value
+
+    # Diffused short wave
+    radiation_short_wave_diff_surface_acc: Value
+
+    geopotential_height: Value
+    land_sea_mask: Value
+
+
+class Weather(NamedTuple):
+    """Represents a weather"""
+    place: str
+    lat: float
+    lon: float
+    data: WeatherData
+
+
+class Forecast(NamedTuple):
+    """Represents a forecast"""
+    place: str
+    lat: float
+    lon: float
+    forecasts: List[WeatherData]
diff --git a/fmi_weather_client/parsers/forecast.py b/fmi_weather_client/parsers/forecast.py
index 59e88d9..e6ed7fd 100644
--- a/fmi_weather_client/parsers/forecast.py
+++ b/fmi_weather_client/parsers/forecast.py
@@ -1,11 +1,14 @@
+# pylint: disable=bad-continuation
+# Just because I like to align them like this ;)
+import math
 from datetime import datetime, timezone
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Optional
 
 import xmltodict
 
-from fmi_weather_client import errors, utils
+from fmi_weather_client import errors
 from fmi_weather_client.errors import NoDataAvailableError
-from fmi_weather_client.models import FMIPlace, Forecast, WeatherData
+from fmi_weather_client.models import FMIPlace, Forecast, WeatherData, Value
 
 
 def parse_forecast(body: str):
@@ -33,8 +36,8 @@ def parse_forecast(body: str):
 
     # Combine typed values with times
     for idx, time in enumerate(times):
-        if utils.is_non_empty_forecast(typed_value_sets[idx]):
-            forecast.forecasts.append(WeatherData(time, typed_value_sets[idx]))
+        if _is_non_empty_forecast(typed_value_sets[idx]):
+            forecast.forecasts.append(_create_weather_data(time, typed_value_sets[idx]))
 
     return forecast
 
@@ -51,7 +54,7 @@ def _body_to_dict(body: str) -> Dict[str, Any]:
     if 'ExceptionReport' in data.keys():
         if 'No locations found for the place' in data['ExceptionReport']['Exception']['ExceptionText'][0]:
             raise errors.NoDataAvailableError
-        elif 'No data available for' in data['ExceptionReport']['Exception']['ExceptionText'][0]:
+        if 'No data available for' in data['ExceptionReport']['Exception']['ExceptionText'][0]:
             raise errors.NoDataAvailableError
         raise errors.ServiceError(data['ExceptionReport']['Exception']['ExceptionText'][0])
 
@@ -111,7 +114,7 @@ def _get_values(data: Dict[str, Any]) -> List[List[float]]:
         value_set = []
         for value in forecast_values:
             value_set.append(float(value))
-            if not contains_values and utils.float_or_none(value) is not None:
+            if not contains_values and _float_or_none(value) is not None:
                 contains_values = True
 
         result.append(value_set)
@@ -120,3 +123,65 @@ def _get_values(data: Dict[str, Any]) -> List[List[float]]:
         raise NoDataAvailableError
 
     return result
+
+
+def _create_weather_data(time, values: Dict[str, float]) -> WeatherData:
+    """Create weather data from raw values"""
+
+    def to_value(vals: Dict[str, float], variable_name: str, unit: str) -> Value:
+        value = vals.get(variable_name, None)
+        return Value(value, unit)
+
+    return WeatherData(
+        time=time,
+        temperature=to_value(values, 'Temperature', '°C'),
+        dew_point=to_value(values, 'DewPoint', '°C'),
+        pressure=to_value(values, 'Pressure', 'hPa'),
+        humidity=to_value(values, 'Humidity', '%'),
+        wind_direction=to_value(values, 'WindDirection', '°'),
+        wind_speed=to_value(values, 'WindSpeedMS', 'm/s'),
+        wind_u_component=to_value(values, 'WindUMS', 'm/s'),
+        wind_v_component=to_value(values, 'WindVMS', 'm/s'),
+        wind_max=to_value(values, 'MaximumWind', 'm/s'),
+        wind_gust=to_value(values, 'WindGust', 'm/s'),
+        symbol=to_value(values, 'WeatherSymbol3', ''),
+        cloud_cover=to_value(values, 'TotalCloudCover', '%'),
+        cloud_low_cover=to_value(values, 'LowCloudCover', '%'),
+        cloud_mid_cover=to_value(values, 'MediumCloudCover', '%'),
+        cloud_high_cover=to_value(values, 'HighCloudCover', '%'),
+        precipitation_amount=to_value(values, 'Precipitation1h', 'mm/h'),
+        radiation_short_wave_acc=to_value(values, 'RadiationGlobalAccumulation', 'J/m²'),
+        radiation_short_wave_surface_net_acc=to_value(values, 'RadiationNetSurfaceSWAccumulation', 'J/m²'),
+        radiation_long_wave_acc=to_value(values, 'RadiationLWAccumulation', 'J/m²'),
+        radiation_long_wave_surface_net_acc=to_value(values, 'RadiationNetSurfaceLWAccumulation', 'J/m²'),
+        radiation_short_wave_diff_surface_acc=to_value(values, 'RadiationDiffuseAccumulation', 'J/m²'),
+        geopotential_height=to_value(values, 'GeopHeight', 'm'),
+        land_sea_mask=to_value(values, 'LandSeaMask', ''))
+
+
+def _float_or_none(value: Any) -> Optional[float]:
+    """
+    Get value as float. None if conversion fails.
+    :param value: Any value
+    :return: Value as float if successful; None otherwise
+    """
+    try:
+        float_value = float(value)
+        if not math.isnan(float_value):
+            return float_value
+        return None
+    except (ValueError, TypeError):
+        return None
+
+
+def _is_non_empty_forecast(forecast: Dict[str, float]) -> bool:
+    """
+    Check if forecast contains proper values
+    :param forecast: Forecast dictionary
+    :return: True if forecast contains values; False otherwise
+    """
+    for _, value in forecast.items():
+        if not math.isnan(value):
+            return True
+
+    return False
diff --git a/fmi_weather_client/utils.py b/fmi_weather_client/utils.py
deleted file mode 100644
index c69e1a7..0000000
--- a/fmi_weather_client/utils.py
+++ /dev/null
@@ -1,26 +0,0 @@
-from typing import Any, Dict, Optional
-
-import math
-
-
-def float_or_none(v: Any) -> Optional[float]:
-    """
-    Get value as float. None if conversion fails.
-    :param v: Any value
-    :return: Value as float if successful; None otherwise
-    """
-    try:
-        f = float(v)
-        if not math.isnan(f):
-            return f
-        return None
-    except (ValueError, TypeError):
-        return None
-
-
-def is_non_empty_forecast(forecast: Dict[str, float]) -> bool:
-    for _, value in forecast.items():
-        if not math.isnan(value):
-            return True
-
-    return False
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3f5f423..28d6cc4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,2 +1,3 @@
 flake8==3.7.9
 pytest==5.3.5
+pylint==2.4.4
diff --git a/setup.py b/setup.py
index a498872..5907aa4 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="fmi-weather-client",
-    version="0.0.10",
+    version="0.0.11",
     author="Mika Hiltunen",
     author_email="saaste@gmail.com",
     description="Library for fetching weather information from Finnish Meteorological Institute (FMI)",
@@ -15,7 +15,7 @@
     packages=setuptools.find_packages(),
     install_requires=[
         'asyncio>=3.4.3',
-        'requests>=2.22.0',
+        'requests>=2.23.0',
         'xmltodict>=0.12.0'
     ],
     classifiers=[