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Period of Record General Climate Summary - Heating Degree Days

Station:(047772) SAN FRAN MISSION DOLORE
From Year=1914 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 432 315 307 269 241 179 171 147 104 126 233 401 2925
60 277 178 163 133 105 58 46 33 19 30 101 248 1393
57 188 104 90 66 41 15 8 5 2 6 44 160 731
55 133 63 52 33 15 3 1 1 0 1 21 109 433
50 37 10 5 2 0 0 0 0 0 0 1 27 82
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 Oct 31, 2012
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