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Period of Record General Climate Summary - Cooling Degree Days

Station:(047772) SAN FRAN MISSION DOLORE
From Year=1914 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	12	31	58	70	92	138	149	173	229	212	91	18	1271
57	4	15	34	43	56	89	94	116	172	155	54	7	838
60	1	4	14	20	27	42	39	51	98	86	22	1	405
65	0	0	3	5	8	13	8	10	33	27	3	0	110
70	0	0	0	1	2	4	2	2	11	7	0	0	29

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 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