EL CAJON, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(042706) EL CAJON
From Year=1979 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	496	479	595	685	817	903	1086	1132	1037	869	614	474	9186
40 S	496	975	1571	2256	3073	3976	5061	6193	7229	8099	8713	9186	9186
45 M	342	338	440	535	662	753	931	977	887	714	464	320	7362
45 S	342	679	1120	1655	2317	3070	4000	4977	5864	6578	7042	7362	7362
50 M	192	200	286	385	507	603	776	822	737	559	315	174	5555
50 S	192	392	678	1064	1571	2174	2949	3771	4507	5067	5381	5555	5555
55 M	76	84	143	238	352	453	621	667	587	405	175	62	3861
55 S	76	160	303	541	893	1346	1966	2633	3220	3624	3799	3861	3861
60 M	16	21	44	110	200	303	466	512	437	253	67	10	2438
60 S	16	37	81	191	391	694	1160	1671	2108	2361	2428	2438	2438

Corn Growing Degree Days
50 M	313	285	341	406	502	586	727	758	674	546	382	304	5825
50 S	313	598	939	1345	1847	2433	3160	3919	4593	5139	5521	5825	5825

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