PORTOLA, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(047085) PORTOLA
From Year=1915 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
55 0 0 0 1 31 112 267 214 91 11 0 0 727
57 0 0 0 0 17 77 211 162 59 6 0 0 532
60 0 0 0 0 6 39 136 97 26 2 0 0 306
65 0 0 0 0 0 9 48 30 4 0 0 0 91
70 0 0 0 0 0 1 10 7 0 0 0 0 18
Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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