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University of Delaware Air Temperature & Precipitation

V3.01 has been converted to netCDF4-classic, unpacked. We are transitioning all files to netCDF4.

Brief Description:

Temporal Coverage:

  • Monthly values for 1901/01 - 2010/12 V3.01.
  • Monthly values for 1901/01 - 2008/12 V2.01.
  • Long term monthly means, derived from data for years 1981 - 2010 V3.01.
  • Long term monthly means, derived from data for years 1950 - 1999 V2.01.

Spatial Coverage:

  • 0.5 degree latitude x 0.5 degree longitude global grid (720x360).
  • 89.75N - 89.75S, 0.25E - 359.75E.


  • N/A

Update Schedule:

  • Static

Download/Plot Data:

Variable Statistic Level Units Download File Create Plot/Subset
Air Temperature Monthly Mean V3.01 Surface deg C air.mon.mean.v301.nc plot
Air Temperature Monthly Mean V2.01 Surface deg C air.mon.mean.v201.nc plot
Air Temperature V3.01 Monthly Long Term Mean Surface deg C air.mon.ltm.v301.nc plot
Air Temperature V2.01 Monthly Long Term Mean Surface deg C air.mon.ltm.v201.nc plot
Precipitation V3.01 Monthly Total Surface cm/month precip.mon.total.v301.nc plot
Precipitation V2.01 Monthly Total Surface cm/month precip.mon.total.v201.nc plot
Precipitation V3.01 Monthly Long Term Mean Surface cm/month precip.mon.ltm.v301.nc plot
Precipitation V2.01 Monthly Long Term Mean Surface cm/month precip.mon.ltm.v201.nc plot

Usage Restrictions:

  • None

Detailed Description:

  • Cort Willmott & Kenji Matsuura of the University of Delaware have put data together from a large number of stations, both from the GHCN2 (Global Historical Climate Network) and, more extensively, from the archive of Legates & Willmott. More details can be found here for temperature and here for precipitation. The result is a monthly climatology of precipitation and air temperature, both at the surface, and a time series, spanning 1900 to 2010, of monthly mean surface air temperatures, and monthly total precipitation. It is land-only in coverage, and complements the ICOADS (International Comprehensive Ocean-Atmosphere Data Set) data set well. For a complete description of the data as given by the providers, related datasets and references to relevant papers please see their web pages at the University of Delaware.


  • None

Related File Naming & Structure Information:

File Names:

  • var.time.stat.nc   (In directory: /Datasets/udel.airt.precip/)

OpenDap File Names:

  • http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/udel.airt.precip/var.time.stat.nc   

Dataset Format and Size:

  • PSD standard NetCDF 311 Mbyte file for each monthly file (packed).
  • PSD standard NetCDF 30 Mbyte file for each long term mean file (packed).

Missing Data:

  • Missing data is flagged with a value of 32767s.


  • Please note: If you acquire UDel_AirT_Precip data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as UDel_AirT_Precip data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the UDel_AirT_Precip data set freely available online in the future. Thank you!


  • See list at bottom of for temperature
  • See list at bottom of for precipitation

Original Source:

  • Center for Climatic Research Department of Geography University of Delaware Newark, DE 19716 The University of Delaware Web site offers extensive documentation of this data set. Please address questions on the analysis method to Kenji Matsuura (kenjisan@udel.edu) University of Delaware.


  • Physical Sciences Division: Data Management
    325 Broadway
    Boulder, CO 80305-3328