PORTOLA, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(047085) PORTOLA
From Year=1948 To Year=2006
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 33 116 273 231 102 14 0 0 770
57 0 0 0 0 19 80 216 176 67 6 0 0 565
60 0 0 0 0 7 41 138 105 30 1 0 0 323
65 0 0 0 0 1 8 47 32 5 0 0 0 92
70 0 0 0 0 0 0 8 6 0 0 0 0 15
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 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