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Freeze index?

Freeze index?

Freeze index?

(OP)
Defenition of freeze index?

RE: Freeze index?

The Air Freezing Index (AFI) for a location is the number of degree-days below freezing over a winter.  Calculated using the average air temperature of a day, in degrees below freezing.  For example, if a daily average temperature is 25 degrees Farenheit, there are 7 degree-days towards the Freezing Index: (32 - 25) x 1 day.  A location has an "average" AFI, and a "design" AFI. The design AFI is based on a design cold winter, such as the coldest over a 30-year period. Explained better/in more detail in various publications, such as http://www1.ncdc.noaa.gov/pub/data/documentlibrary/tddoc/td9712d.doc  

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