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API Name	Description	Category	Followers	Versions
GeoNames API	Geonames is a geographical database with web services that let users extract useful information about different places, such as weather, timezone and post codes. The GeoNames geographical database...	Reference	560	REST
Weather Channel API	(This API is now part of IBM Cloud's The Weather Company APIs) From their site: Since 1982, The Weather Channel has brought timely weather information to the world. Now you can include weather from...	Weather	1,662	REST
NOAA National Weather Service (NWS) NDFD SOAP API	The NOAA National Weather Service (NWS) NDFD SOAP API provides programmatic access to forecasts, weather watches/warnings, current observations, tropical cyclone advisories, and storm prediction...	Weather	445	RPC v1.0
Weather Underground (Wunderground) API	Weather Underground provides real-time weather information via the Internet. Weather Underground provides weather reports for cities across the world as well as local weather reports for newspapers...	Weather	667	REST
OpenWeatherMap API	[This API has been deprecated and replaced by the Current Weather Data, 5 Day Weather Forecast, 16 Day Weather Forecast, Historical Data, History Bulk, Weather Map Layers, Ultraviolet Index, Weather...	Weather	233	REST v2.5
World Weather Online API	[This API is no longer available. Its functions have been split among the following APIs: World Weather Online City Search, World Weather Online Time Zone, World Weather Online Ski and Mountain,...	Weather	283	REST
Yahoo Weather API	The Yahoo Weather API allows developers to integrate weather information for any location into third-party applications. Available information includes the 5-day forecast, wind, atmospheric...	Weather	1,301	REST v1
AMEE API	AMEE is a platform for greenhouse gas calculation, with access to emissions factors, calculation algorithms, and storage for data history. Our science team take the published methodologies from the...	Science	43	REST
Norway Weather API	met.no is the joint online weather service from the Norwegian Meteorological Institute (met.no) and the Norwegian Broadcasting Corporation (NRK). met.no offers weather forecasts in English for more...	Weather	131	REST
NOAA Climate Data Online API	The service gives access to accumulated data on climate for locations worldwide but with emphasis on the continental United States. Data sum conditions recorded annually, by month, by day, and even...	Weather	121	REST v2
AerisWeather API	AerisWeather is a site that provides traditional weather content such as local weather and weather maps. AerisWeather's core product is an API that provides the necessary weather data to power...	Weather	130	REST v1.9.10
Weather Central API	The Weather Central DataCloud API lets you programmatically access Weather Centralâ€™s real-time updating weather datasets. This allows you to give your users mission critical weather information...	Weather	90	REST
Brighter Planet CM1 API	This web service, part of Brighter Planet's carbon middleware suite, enables developers to build flexible, real-time carbon footprint estimates from sources such as cars, flights, and houses into...	Environment	30	REST
MAAS2 API	MAAS2 is a REST API that provides the latest weather data transmitted by the Curiosity Rover on Mars. This API is built upon the REMS (Rover Environmental Monitoring Station). MAAS2 responds in JSON...	Astronomy	29	REST v1.0.0
OpenWeatherMap Air Pollution API	Gain access to OpenWeatherMap's Carbon Monoxide index for any location on Earth. This includes location, latitude, pressure and more. OpenWeatherMap provides open weather data, satellite imagery,...	Weather	22	REST v1.0
Met.no Weather API	Met.no is a Norwegian Meteorological Institute that provides the public with meteorological services for both civil and military puposes. The Met.no Weather API lets developers to integrate the...	Weather	11	REST
Environmental Life Cycle Impact Assessment API	The service from the Center for Energy and Processes (CEP) in France provides estimates of environmental impact of photovoltaic (PV) technologies over their complete life cycles. It assesses impact...	Weather	5	RPC
Climate Counts API	Climate Counts is a nonprofit organization that scores corporations on their efforts towards mitigating climate change. Corporations are scored on whether they have reviewed their own emissions, set...	Other	9	REST
National Weather Service NDFD API	The National Oceanic and Atmospheric Administration (NOAA) provides the public, government agencies, and commercial enterprises with XML data from the National Weather Service's (NWS) digital...	Weather	27	RPC
AccuWeather API	AccuWeather APIs are now easily available to developers with our new AccuWeather API Developer Portal. Sign up today for a free trial package, or one of three package options — Standard, Prime, and...	Weather	1,737	REST
InnerGears Weather by City API	From their site: This Web service returns a detailed weather report of current conditions for any given city in the world. Simply enter a city name and instantly receive the city, state, country,...	Weather	46	RPC
Globaleur Content API	The Globaleur Content API provides details and photos for 1 million points of interest in 200 cities. The API returns unique information such as themes, suggested visit duration. Methods are...	Travel	2	REST v1
Great Circle Forecast API	The Great Circle Forecast API provides weather forecasts primarily for sailing races. Data returned includes wind, pressure, temperature, precipitations, sea currents, etc. for a specified location....	Weather	2	REST v1
Fogerizer Fog Detection API	Fog Detection API - Fogerizer (also known as Fog Recognition API or Fog Storm Detector API) is a cross browsers REST API which get a JSON input with a still photo (NOT a radar photo) (as base64...	Artificial Intelligence	2	REST v1.0
HailQuid Hail Rain Detection API	Hail Rain Detection API - HailQuid (also known as Hail Rain Recognition API or Hail Storm Detector API) is a cross browsers REST API which get a JSON input with a still photo (NOT a radar photo) (as...	Artificial Intelligence	2	REST v1.0