WALLA WALLA RGNL AP, 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