SNOQUALMIE PASS, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457781) SNOQUALMIE PASS
From Year=1931 To Year=1972
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1193	981	954	755	595	401	229	234	359	628	937	1124	8388
60	1038	839	799	605	441	261	112	116	224	474	787	969	6664
57	945	755	706	515	351	186	62	64	155	383	697	876	5694
55	883	698	644	456	293	141	38	38	116	324	637	814	5082
50	728	557	489	309	163	54	7	6	43	189	487	659	3690

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