gives the most recent measurement for air pressure near the current location.


gives the air pressure value for the specified time near the current location.


gives the most recent measurement for air pressure near the specified locations.


gives the value or values for the specified date and location.


gives values for all specified locations on the specified dates.

Details and Options

  • AirPressureData gives current and historical mean sea level pressure data for all standard weather stations worldwide. Mean sea level pressure is the atmospheric pressure at sea level, or for locations at altitude, the station pressure reduced to sea level.
  • AirPressureData[] makes use of $GeoLocation and $TimeZone to determine your location and time zone. It returns the most recent measurement of air pressure for the nearest high-reliability weather station to the location specified by $GeoLocation.
  • The location can be specified as an ICAO code such as "KNYC", a WMO code such as "WMO12345", an amateur weather station code such as "C1234", or another standardized weather station identifier.
  • The location can also be specified by latitude/longitude pairs, assuming degrees as units, a GeoPosition specification, or Entity objects, assuming they represent objects with geographic coordinates. They can also be GeoGraphics primitives such as GeoDisk, or a city specification of the type used in CityData. AirPressureData gives measurements for the nearest high-reliability weather station to the location.
  • locationspec can be either individual locations or lists of them.
  • datespec can be specified as a date list, a string in DateString format, or as a DateObject.
  • AirPressureData[locationspec,datespec] by default takes datespec to be given in local time and uses UTC for all output times.
  • When specific times are given, an interpolated result for that time is returned. datespec specifications for a day or longer period return the interval of air pressure measurements.
  • datespec can be specified as {start,end,step} for compatibility with DateRange specifications. step can be All, "Day", "Week", "Month", or "Year". All gives all recorded observations. If omitted, step is assumed to have the value All.
  • Location and date can also be specified together as Association["Location"->locationspec,"Date"datespec].
  • AirPressureData[locationspec,datespec,func] is used to specify the format of output when locations are specified.
  • Possible settings for func include:
  • Allreturn all values for extended locations and times
    Automaticreturn intervals for extended locations and indeterminate times
    Intervalreturn intervals for extended locations and times
    Maxreturn maximum values for extended locations and times
    Meanreturn mean value for extended locations and times
    Minreturn minumum values for extended locations and times
    StandardDeviationreturn standard deviation for extended locations and times
    "Stations"return all values along with their source weather station
  • Pressure is returned as a Quantity in either millibars or inches of mercury.
  • The option UnitSystem controls output units. The default value is set by $UnitSystem. The following settings can also be used:
  • "Imperial"return results in imperial units
    "Metric"return results in metric units
  • AirPressureData[locationspec,"property"] returns the specified weather station property for the location corresponding to locationspec.
  • Properties related to identifying weather stations include:
  • "Coordinates"weather station coordinates as a GeoPosition
    "Memberships"WMO, NCDC, and CWOP reporting network membership
    "NearestStation"the nearest weather station
    "StationDistance"distance in km between specified location and station given
    "StationName"weather station name
  • AirPressureData can retrieve observational air pressure data from meteorological stations throughout the world.


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Basic Examples  (1)

Find the most recent air pressure measurement near your current location:

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Air pressure can be returned in millibars or inches of mercury:

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Discover the recorded air pressure for a specific weather station:

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Obtain the interpolated air pressure at a specific date and weather station:

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Scope  (19)

Options  (2)

Applications  (2)

Properties & Relations  (3)

Neat Examples  (2)

Introduced in 2014