SNOQUALMIE PASS, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457781) SNOQUALMIE PASS
From Year=1910 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	1192	984	959	769	614	409	234	235	377	640	928	1128	8470
60	1037	842	804	619	460	268	113	113	240	486	778	973	6734
57	944	758	711	529	369	192	61	61	168	394	688	880	5756
55	882	701	649	469	311	146	36	36	126	335	628	818	5138
50	727	560	494	322	177	57	6	5	49	198	479	663	3736

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