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=2001
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	973	729	606	393	207	61	7	9	85	348	694	923	5034
60	818	588	452	253	100	16	1	1	30	212	545	768	3783
57	725	503	360	178	55	5	0	0	14	142	456	675	3114
55	663	447	301	133	33	2	0	0	8	103	398	614	2702
50	512	312	166	47	5	0	0	0	1	37	261	462	1804

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 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