SAN FRANCISCO RICHMOND, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(047767) SAN FRANCISCO RICHMOND
From Year=1948 To Year=2005
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	440	348	361	329	300	240	209	175	152	198	297	431	3479
60	285	208	208	184	148	97	66	44	35	72	155	276	1779
57	194	130	123	103	68	31	15	8	6	23	83	186	970
55	139	84	76	58	28	9	2	1	1	8	47	131	585
50	40	14	8	4	0	0	0	0	0	0	5	35	106

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 Apr 5, 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