SNOQUALMIE FALLS, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457773) SNOQUALMIE FALLS
From Year=1898 To Year=2010
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	822	675	643	483	331	186	83	84	211	440	632	788	5378
60	667	534	488	335	190	75	17	16	91	288	482	633	3818
57	574	449	396	250	118	33	4	3	43	202	393	540	3005
55	512	393	335	197	78	15	1	1	23	151	334	478	2519
50	360	257	191	84	17	1	0	0	3	56	195	325	1488

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