EL CAJON 2 E, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(042705) EL CAJON YALE RANCH
From Year=1899 To Year=1959
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	376	392	496	586	718	832	1016	1037	937	775	569	431	8165
40 S	376	768	1264	1849	2567	3400	4416	5453	6390	7165	7734	8165	8165
45 M	226	253	341	436	563	682	861	882	787	620	419	277	6347
45 S	226	478	819	1255	1818	2500	3362	4244	5031	5651	6070	6347	6347
50 M	100	127	190	287	408	532	706	727	637	465	272	137	4588
50 S	100	226	417	703	1111	1644	2350	3077	3714	4179	4451	4588	4588
55 M	25	41	75	148	256	382	551	572	487	311	139	43	3030
55 S	25	66	141	289	545	927	1479	2051	2538	2848	2987	3030	3030
60 M	4	8	17	51	119	234	396	417	337	166	50	7	1806
60 S	4	11	29	80	199	432	829	1246	1583	1749	1799	1806	1806

Corn Growing Degree Days
50 M	267	258	314	353	429	520	654	673	586	485	396	311	5248
50 S	267	526	840	1193	1622	2142	2796	3469	4055	4540	4936	5248	5248

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