SAN FRANCISCO RICHMOND, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047767) SAN FRANCISCO RICHMOND
From Year=1948 To Year=2005
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	335	359	415	422	476	511	567	603	606	588	455	345	5680
40 S	335	694	1109	1531	2006	2517	3084	3687	4292	4880	5335	5680	5680
45 M	185	218	260	272	321	361	412	448	456	433	305	194	3864
45 S	185	403	663	935	1256	1616	2028	2476	2931	3364	3669	3864	3864
50 M	65	90	113	126	166	211	257	293	306	278	160	69	2133
50 S	65	155	268	394	560	771	1028	1321	1626	1904	2064	2133	2133
55 M	9	19	26	30	39	69	104	139	157	131	52	11	786
55 S	9	28	54	83	122	192	296	435	592	723	775	786	786
60 M	0	2	3	6	4	8	13	26	41	40	10	0	153
60 S	0	2	5	11	15	23	36	62	103	143	153	153	153

Corn Growing Degree Days
50 M	123	141	164	169	188	218	258	293	306	287	201	126	2475
50 S	123	264	428	597	785	1003	1261	1554	1860	2147	2349	2475	2475

M = Monthly Data
S - Running sum of monthly data.
Growing 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.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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