DIABLO DAM, WASHINGTON

Period of Record General Climate Summary - Cooling Degree Days

Station:(452157) DIABLO DAM
From Year=1931 To Year=2006
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	0	0	10	76	156	303	312	158	18	0	0	1033
57	0	0	0	5	53	117	246	254	117	9	0	0	800
60	0	0	0	2	27	70	170	175	69	2	0	0	515
65	0	0	0	0	7	23	73	76	21	0	0	0	200
70	0	0	0	0	1	5	23	23	3	0	0	0	55

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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