DIABLO DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(452157) DIABLO DAM
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 1011 817 756 540 345 191 80 72 190 483 768 958 6211
60 856 676 601 392 208 87 23 18 88 331 618 803 4698
57 763 591 508 305 139 44 7 5 46 243 528 710 3888
55 701 534 446 250 100 24 3 2 27 189 468 648 3390
50 546 393 293 128 31 2 0 0 3 79 318 493 2287
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