WHITE SWAN, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(459191) WHITE SWAN
From Year=1948 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	1142	800	675	448	242	92	29	35	139	452	774	998	5826
60	987	659	520	303	127	29	5	5	58	302	624	843	4462
57	894	574	428	221	76	11	1	1	29	219	535	750	3738
55	832	518	367	171	49	4	0	0	17	170	475	688	3291
50	678	377	222	69	11	0	0	0	3	72	329	534	2295

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