Weather Data
The Wolfram Language has direct access to a worldwide feed of real-time weather data, together with complete historical data, stretching back more than a century in many locations. Within the Wolfram Language, weather data immediately becomes fully computable, using symbolic representations for measured quantities, geo positions, dates, time series, etc.
WeatherData — complete current and historical worldwide weather data
WeatherForecastData — forecasted worldwide weather data
AirTemperatureData ▪ AirPressureData
WindSpeedData ▪ WindDirectionData ▪ WindVectorData
Entity — give a geographic entity to specify a position (use 
for free-form input)
GeoPosition — give a lat-lon geo position
DateObject — specify a date and time
LocalTime — find the local time for any location
Quantity — representation of a quantity with units
UnitConvert — convert between different units and unit systems
IconData — access graphical icons for common weather measurements
TimeSeries — represent a time series of data, suitable for further computation
DateListPlot — plot data that is tagged with dates
GeoGraphics — plot data on geographical maps
Historical Severe Weather
TropicalStorm — historical data on named hurricanes and other tropical storms
StandardAtmosphereData — computable standard atmosphere model
Astronomical Computations »
Sunrise ▪ Sunset ▪ SunPosition ▪ MoonPhase ▪ ...
TideData — computed tides for all standard tide stations
Local Data Acquisition »
DeviceOpen — connect to a real-time measuring device