SAN FRAN ACAD OF SCI, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047765) SAN FRANCISCO ACAD OF S
From Year=1951 To Year=1957
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	286	327	364	404	488	506	509	505	593	569	461	333	5345
40 S	286	612	976	1381	1869	2374	2883	3388	3981	4550	5011	5345	5345
45 M	138	186	210	254	333	356	354	350	443	414	312	183	3533
45 S	138	324	535	789	1122	1478	1831	2182	2625	3038	3350	3533	3533
50 M	37	72	81	111	178	206	199	195	293	259	169	63	1863
50 S	37	109	189	300	479	684	883	1078	1371	1630	1800	1863	1863
55 M	4	15	20	27	52	67	52	60	147	117	61	8	630
55 S	4	19	39	66	118	185	237	297	444	561	622	630	630
60 M	0	1	5	5	14	16	3	6	46	34	14	0	144
60 S	0	1	5	11	24	40	44	50	96	130	144	144	144

Corn Growing Degree Days
50 M	90	136	148	160	212	219	205	201	294	277	210	120	2273
50 S	90	226	374	535	746	965	1171	1372	1666	1943	2153	2273	2273

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 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