GILROY, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(043417) GILROY
From Year=1957 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	264	341	461	550	714	832	963	963	874	724	437	268	7389
40 S	264	605	1065	1615	2329	3160	4123	5087	5960	6685	7121	7389	7389
45 M	132	204	307	400	559	682	808	808	724	569	288	132	5612
45 S	132	335	642	1042	1600	2282	3090	3899	4622	5192	5480	5612	5612
50 M	43	90	167	254	404	532	653	653	574	415	154	43	3982
50 S	43	133	299	554	958	1489	2142	2796	3370	3784	3938	3982	3982
55 M	7	24	66	130	254	382	498	498	424	264	59	7	2615
55 S	7	32	97	227	482	864	1362	1860	2284	2548	2608	2615	2615
60 M	0	3	16	49	127	236	343	343	275	136	13	1	1543
60 S	0	3	19	68	196	432	775	1119	1394	1529	1542	1543	1543

Corn Growing Degree Days
50 M	153	195	269	337	435	508	595	597	538	447	266	162	4503
50 S	153	349	617	954	1389	1898	2493	3090	3628	4075	4341	4503	4503

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 Jul 28, 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