WHITE SWAN, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(459191) WHITE SWAN
From Year=1927 To Year=1981
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1136	817	659	430	235	94	24	31	137	435	773	982	5754
60	981	676	504	286	121	29	4	5	56	289	624	827	4401
57	888	591	412	206	71	10	1	1	28	209	534	734	3684
55	826	535	352	158	45	4	0	0	17	161	474	672	3243
50	671	394	210	62	9	0	0	0	3	69	328	519	2267

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