PASADENA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046719) PASADENA
From Year=1893 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
65 328 262 232 150 82 21 1 1 5 49 160 306 1597
60 190 142 111 58 20 2 0 0 0 10 64 168 764
57 121 83 59 25 5 0 0 0 0 3 29 101 426
55 83 53 35 12 2 0 0 0 0 1 15 66 268
50 24 12 6 1 0 0 0 0 0 0 2 16 62
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