WALLA WALLA FAA AIRPORT, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(458928) WALLA WALLA FAA AIRPORT
From Year=1949 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
65 968 730 605 392 209 62 7 8 82 348 694 924 5029
60 813 589 451 253 101 16 1 1 29 212 544 769 3778
57 720 504 359 177 56 5 0 0 13 142 455 676 3109
55 659 448 300 132 33 2 0 0 7 103 397 615 2697
50 508 313 165 46 5 0 0 0 1 37 260 463 1799
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