SEATTLE UNIV OF WASH, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457478) SEATTLE UNIV OF WASHING
From Year=1909 To Year=1983
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	792	635	603	440	279	140	58	58	148	358	571	720	4801
60	637	494	448	293	145	43	8	8	50	209	421	565	3321
57	544	409	355	210	82	14	1	2	19	131	332	472	2570
55	482	353	294	159	49	5	0	1	9	88	273	410	2122
50	329	216	152	57	9	0	0	0	1	21	138	258	1181

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