COTTONWOOD, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(022193) COTTONWOOD
From Year=1911 To Year=1977
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	142	237	403	594	863	1113	1329	1243	1043	747	374	160	8247
40 S	142	379	782	1376	2238	3351	4680	5923	6966	7713	8087	8247	8247
45 M	53	123	261	446	708	963	1174	1088	893	593	236	61	6598
45 S	53	176	437	883	1591	2554	3727	4815	5708	6301	6536	6598	6598
50 M	11	46	142	304	554	813	1019	933	743	441	119	12	5136
50 S	11	57	199	503	1057	1870	2888	3821	4564	5005	5124	5136	5136
55 M	1	10	57	177	403	663	864	778	593	296	40	1	3882
55 S	1	11	68	245	648	1311	2174	2952	3545	3841	3881	3882	3882
60 M	0	1	14	78	260	513	709	623	443	167	8	0	2815
60 S	0	1	15	93	353	866	1574	2197	2640	2807	2815	2815	2815

Corn Growing Degree Days
50 M	132	186	291	395	547	679	825	789	661	480	269	140	5393
50 S	132	318	609	1004	1551	2229	3055	3844	4505	4984	5253	5393	5393

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