BOTHELL, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(450826) BOTHELL 2 N
From Year=1931 To Year=1959
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	856	700	670	490	341	221	119	125	218	434	651	771	5597
60	701	559	515	341	198	94	26	29	97	282	501	616	3959
57	608	475	422	255	124	40	6	6	49	198	411	523	3117
55	546	419	361	200	83	19	2	2	28	147	351	461	2618
50	393	280	213	83	19	2	0	0	5	54	208	308	1565

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