UKIAH, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(049122) UKIAH
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
65 590 448 410 286 156 45 4 4 36 164 402 584 3129
60 435 307 261 158 63 9 0 0 7 65 256 429 1991
57 342 226 180 96 29 2 0 0 2 31 175 337 1421
55 281 174 133 64 15 1 0 0 1 17 128 277 1090
50 144 72 48 15 1 0 0 0 0 2 44 140 467
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