SANTA ROSA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047965) SANTA ROSA
From Year=1931 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	229	307	408	486	628	749	837	842	797	676	408	250	6616
40 S	229	536	944	1430	2057	2806	3644	4485	5282	5958	6366	6616	6616
45 M	104	173	255	336	473	599	682	687	647	521	260	119	4855
45 S	104	276	531	867	1340	1939	2621	3308	3955	4476	4736	4855	4855
50 M	30	67	121	192	318	449	527	532	497	367	129	37	3265
50 S	30	96	217	409	727	1176	1703	2235	2732	3099	3228	3265	3265
55 M	4	14	37	78	171	300	372	377	347	217	43	6	1967
55 S	4	18	55	134	305	604	977	1353	1700	1917	1961	1967	1967
60 M	0	1	6	22	64	159	218	222	200	95	8	0	996
60 S	0	1	8	29	94	252	470	692	893	988	996	996	996

Corn Growing Degree Days
50 M	120	173	244	299	379	454	513	518	487	424	250	132	3994
50 S	120	294	537	837	1216	1669	2183	2701	3188	3612	3861	3994	3994

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