SPOKANE WSO AIRPORT, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457938) SPOKANE WSO AIRPORT
From Year=1889 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1167	929	794	530	311	134	30	39	193	515	858	1099	6602
60	1012	788	639	383	183	54	6	9	96	364	708	944	5188
57	919	703	546	299	120	25	2	3	56	279	618	851	4421
55	857	647	484	245	85	13	1	1	36	226	559	789	3944
50	702	506	333	128	27	1	0	0	9	115	410	635	2865

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