SEDRO WOOLLEY 1 E, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457507) SEDRO WOOLLEY 1 E
From Year=1931 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	809	659	618	458	312	178	99	86	198	418	627	774	5235
60	654	518	463	310	169	61	18	13	76	266	477	619	3645
57	561	434	370	224	98	21	4	2	31	181	387	526	2839
55	500	377	309	170	61	8	1	0	14	131	328	464	2365
50	348	240	165	61	9	0	0	0	1	42	191	313	1370

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