Degree days are the measure of the number of days from april 1 to oct 31, that the mean temperature is above 50. This was determined by Winkler
this is used to divide california into climate regions.
region I is 2500 degree days or lower
region II is 2501 to 3000
region III is 3001 to 3500
region IV is 3501 to 4000
region V is 4001 or more
Sunday, February 21, 2010
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