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Freezing points

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View Resource Global Annual Freezing and Thawing Indices

The National Snow and Ice Data Center provide these data showing the "cumulative number of degree-days when air temperatures are below and above zero degrees Celsius." Two data files, one each for the freezing and thaw data, and a readme file are available. A Fortran program is provided in the data documentation to read the data that are in flat binary format.

https://nsidc.org/data/nsidc-0063