MOUNT DIABLO JUNCTION, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(045915) MOUNT DIABLO JUNCTION
From Year=1952 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	11	18	31	77	171	332	565	552	449	264	64	16	2549
57	6	10	19	56	135	280	504	491	392	215	45	8	2160
60	1	3	8	32	93	211	415	401	309	152	23	3	1651
65	0	0	1	9	44	123	278	263	191	75	6	0	991
70	0	0	0	2	16	64	163	151	101	32	1	0	531

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