SPOKANE INTL AP, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457938) SPOKANE WSO AIRPORT
From Year=1889 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	1166	929	795	533	313	136	29	39	190	517	859	1103	6610
60	1011	788	640	386	185	54	6	9	94	366	709	948	5198
57	918	703	547	302	121	25	2	3	55	281	619	855	4431
55	856	646	485	248	86	14	1	1	35	227	559	793	3953
50	701	505	334	131	28	2	0	0	9	116	411	639	2873

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