PORT TOWNSEND, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(456678) PORT TOWNSEND
From Year=1891 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	766	639	619	475	343	212	124	118	209	412	591	725	5233
60	611	498	464	325	194	83	24	21	81	258	441	570	3571
57	518	413	371	236	114	30	4	3	31	170	351	477	2720
55	456	357	309	180	70	12	1	1	13	116	291	415	2222
50	303	217	161	61	10	0	0	0	1	28	150	262	1193

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