SEDRO WOOLLEY, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457507) SEDRO WOOLLEY 1 E
From Year=1896 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	826	669	625	458	313	176	98	91	206	422	626	783	5293
60	671	528	470	309	171	61	18	16	83	270	476	628	3700
57	578	443	377	224	99	22	3	3	36	185	387	535	2891
55	516	387	316	170	61	8	1	1	17	134	328	473	2413
50	364	250	172	62	9	0	0	0	1	43	191	321	1413

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