SAN RAFAEL CIVIC CTR, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047880) SAN RAFAEL CIVIC CENTER
From Year=1894 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	263	341	444	521	651	750	855	855	803	702	460	287	6933
40 S	263	605	1049	1570	2221	2971	3826	4681	5484	6187	6646	6933	6933
45 M	126	204	290	371	496	600	700	700	653	547	311	148	5146
45 S	126	330	620	991	1488	2087	2788	3487	4140	4688	4998	5146	5146
50 M	37	87	148	224	342	450	545	545	503	392	171	49	3493
50 S	37	124	272	496	838	1287	1833	2377	2881	3273	3444	3493	3493
55 M	5	20	50	102	192	300	390	390	354	240	64	9	2116
55 S	5	25	74	176	368	669	1059	1449	1803	2043	2107	2116	2116
60 M	0	2	10	33	81	160	236	235	208	109	15	1	1090
60 S	0	2	12	45	126	286	522	758	966	1075	1089	1090	1090

Corn Growing Degree Days
50 M	102	159	222	283	366	444	528	529	488	411	235	116	3883
50 S	102	260	482	766	1132	1576	2103	2633	3121	3532	3767	3883	3883

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