PORT TOWNSEND, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(456678) PORT TOWNSEND
From Year=1948 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	747	621	608	466	329	201	113	101	192	409	592	724	5102
60	592	480	453	317	182	74	19	15	69	255	442	569	3466
57	499	395	360	229	105	25	3	2	25	166	352	476	2636
55	437	339	298	172	63	9	0	0	10	113	292	414	2149
50	284	199	150	56	9	0	0	0	0	26	150	260	1135

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