Data Set ID:

Northern Hemisphere EASE-Grid Annual Freezing and Thawing Indices, 1901 - 2002, Version 1

This data set contains annual freezing and thawing indices for each year from 1901 to 2002 on the 25 km resolution Equal-Area Scalable Earth Grid (EASE-Grid). Annual freezing and thawing indices are defined as the cumulative number of degree-days when air temperatures are below and above 0 degrees C. The values were calculated based upon the monthly mean air temperature from the 1901-2002, 0.5 deg. global land temperatures from the University of East Anglia Climate Research Unit (Mitchell and Jones, 2005).

Two ASCII files are available for each year for the freezing and thawing indices, respectively. Each file is approximately 5.5 MB in size. In addition, there is one 10.4 MB ASCII file defining the latitude and longitude coordinates for each grid point. The data set is available in compressed form via FTP.

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Geographic Coverage

Data Set Tabs

Spatial Coverage:
  • N: 90, S: 0, E: 180, W: -180

Spatial Resolution:
  • 25 km x 25 km
Temporal Coverage
  • 1901-01-01 to 2002-12-31
Temporal Resolution:
12 month
  • Atmospheric Temperature > Air Temperature
  • Atmospheric Temperature > Degree Days > Freezing/Thawing Index
  • Atmospheric Temperature > Surface Air Temperature
Not specified
Sensor(s): Not specified
Data Format(s):
  • ASCII Text (.txt)
Data Contributor(s): Tingjun Zhang, Oliver Frauenfeld, R. Barry

Data Citation

As a condition of using this data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

T. Zhang, O. W. Frauenfeld, James McCreight, Roger Barry 2005. Northern Hemisphere EASE-Grid Annual Freezing and Thawing Indices, 1901 - 2002, Version 1. [indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. [Date Accessed].

Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA