IMPERIAL CO AP, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(044224) IMPERIAL FAA AIRPORT
From Year=1962 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	424	514	699	842	1141	1362	1616	1610	1365	1048	680	429	11730
40 S	424	938	1637	2479	3620	4981	6597	8207	9572	10621	11301	11730	11730
45 M	275	373	544	692	986	1212	1461	1455	1215	893	530	278	9914
45 S	275	649	1192	1884	2870	4081	5543	6998	8213	9106	9636	9914	9914
50 M	143	236	389	542	831	1062	1306	1300	1065	739	382	141	8134
50 S	143	378	768	1309	2140	3202	4508	5808	6873	7612	7993	8134	8134
55 M	51	114	242	392	676	912	1151	1145	915	584	238	45	6464
55 S	51	165	406	798	1474	2386	3537	4682	5597	6181	6420	6464	6464
60 M	11	38	123	249	521	762	996	990	765	431	117	8	5012
60 S	11	49	172	421	943	1704	2700	3690	4455	4887	5004	5012	5012

Corn Growing Degree Days
50 M	291	336	441	520	698	811	977	985	847	660	430	287	7283
50 S	291	626	1068	1588	2286	3097	4075	5059	5906	6566	6996	7283	7283

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