GILROY, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(043417) GILROY
From Year=1906 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	267	341	461	548	714	832	963	961	873	723	439	268	7391
40 S	267	607	1069	1616	2331	3163	4126	5087	5960	6684	7122	7391	7391
45 M	133	204	307	398	559	682	808	806	723	568	291	132	5612
45 S	133	337	644	1042	1601	2284	3092	3898	4621	5189	5480	5612	5612
50 M	43	90	166	252	405	532	653	651	573	414	156	43	3979
50 S	43	133	299	552	956	1489	2142	2793	3366	3780	3936	3979	3979
55 M	7	24	65	129	255	383	498	496	423	263	61	7	2611
55 S	7	31	96	225	480	862	1361	1857	2280	2543	2604	2611	2611
60 M	0	3	16	49	127	237	344	341	275	134	13	0	1538
60 S	0	3	19	68	195	431	775	1116	1391	1524	1538	1538	1538

Corn Growing Degree Days
50 M	155	194	270	334	435	508	596	597	537	445	266	161	4499
50 S	155	349	619	953	1388	1896	2493	3090	3626	4072	4338	4499	4499

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