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:

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

Discover the recorded air pressure for a specific weather station:

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

Scope  (19)

Location Specification  (6)

The current air pressure from a high-reliability station at the approximate coordinates of "KBOS":

Coordinates can be supplied for a location:

Entity objects can be used:

Obtain the appropriate Entity using free-form input ():

Discover the range of air pressure measurements in a 180-degree arc to the west of London:

Find the recorded air pressure across a geographic region:

To return the station from coordinates or a city name, use the "StationName" property:

Station Properties  (3)

Find the name and coordinates of the station used:

Discover the approximate distance of the station used from a specified location:

Learn a station's recorded altitude:

Date Specification  (3)

Dates can be input using DateObject:

Dates can also be specified in DateList format:

Date ranges in the format {start,end} will return all data within that range:

Date specifications for a time period larger than an hour will return the Interval for the recorded pressures for that time period:

Lists of Locations  (3)

Lists of locations can be provided:

Calculate the air pressure for multiple locations at a specific time:

Find the calculated air pressures of multiple locations and dates:

Format Specification  (2)

Find the air pressure for an extended location:

Obtain the maximum or minimum pressure:

Use the setting Mean to obtain the average pressure:

Return the station for all displayed values:

Association Specification  (2)

Date and location can be specified together using Association:

Association specification works with format arguments:

Options  (2)

UnitSystem  (2)

By default, results use the format given by $UnitSystem:

Set UnitSystem to "Imperial" to specify inches of mercury:

Or set UnitSystem to "Metric" to specify millibars:

UnitConvert can also be used to adjust the units:

Applications  (2)

Calculate the air density based on temperature and pressure for large cities in New Jersey:

Calculate the absolute air pressure near a location:

Properties & Relations  (2)

By default, location is specified by $GeoLocation:

Find all stations in a region with GeoEntities:

Find the pressure at all stations:

Neat Examples  (2)

Examine pressure reading drops from major storms:

Fit the distribution of recorded air pressures for a location to a normal distribution:

Wolfram Research (2014), AirPressureData, Wolfram Language function,


Wolfram Research (2014), AirPressureData, Wolfram Language function,


Wolfram Language. 2014. "AirPressureData." Wolfram Language & System Documentation Center. Wolfram Research.


Wolfram Language. (2014). AirPressureData. Wolfram Language & System Documentation Center. Retrieved from


@misc{reference.wolfram_2024_airpressuredata, author="Wolfram Research", title="{AirPressureData}", year="2014", howpublished="\url{}", note=[Accessed: 15-July-2024 ]}


@online{reference.wolfram_2024_airpressuredata, organization={Wolfram Research}, title={AirPressureData}, year={2014}, url={}, note=[Accessed: 15-July-2024 ]}