SAN FRAN ACAD OF SCI, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(047765) SAN FRANCISCO ACAD OF S
From Year=1951 To Year=1957
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	489	382	412	346	291	248	266	270	171	216	292	442	3825
60	334	241	261	201	146	111	114	121	53	85	153	287	2106
57	242	161	175	120	68	41	37	49	15	33	83	196	1220
55	183	114	121	72	28	12	9	19	4	13	50	140	766
50	61	29	27	7	0	0	0	0	0	1	8	40	171

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