COTTONWOOD, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(022193) COTTONWOOD
From Year=1949 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	136	222	374	572	835	1088	1308	1229	1030	738	360	148	8040
40 S	136	358	731	1304	2139	3227	4535	5763	6794	7532	7893	8040	8040
45 M	49	113	236	425	680	938	1153	1074	880	585	223	54	6410
45 S	49	162	398	823	1503	2441	3594	4668	5548	6133	6356	6410	6410
50 M	10	43	123	285	525	788	998	919	730	434	109	11	4975
50 S	10	53	175	460	985	1774	2772	3690	4421	4854	4964	4975	4975
55 M	1	10	46	160	374	638	843	764	580	289	35	1	3741
55 S	1	11	57	217	591	1229	2072	2836	3416	3705	3740	3741	3741
60 M	0	1	10	65	233	488	688	609	431	161	5	0	2691
60 S	0	1	12	76	310	798	1486	2094	2525	2686	2691	2691	2691

Corn Growing Degree Days
50 M	137	191	286	393	527	653	803	769	643	479	274	147	5300
50 S	137	328	613	1006	1533	2186	2988	3757	4401	4879	5153	5300	5300

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 Jul 28, 2006
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