GILROY, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(043417) GILROY
From Year=1957 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 514 367 316 213 109 30 3 3 16 101 315 511 2497
60 359 228 176 99 34 4 0 0 2 31 176 357 1466
57 268 152 107 52 13 1 0 0 0 11 109 266 979
55 211 108 70 30 6 0 0 0 0 5 73 208 712
50 92 33 16 5 0 0 0 0 0 0 17 90 253
Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Jul 28, 2006
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu