DIABLO DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(452157) DIABLO DAM
From Year=1931 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	997	809	752	538	341	191	84	76	190	479	762	944	6161
60	842	668	597	389	206	88	25	20	88	326	612	789	4649
57	749	583	504	303	139	44	9	5	47	239	522	696	3839
55	687	527	442	248	100	24	3	2	27	186	462	634	3341
50	532	385	289	127	32	2	0	0	4	78	313	479	2240

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