COLORADO CITY, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(021920) COLORADO CITY
From Year=1963 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	30	80	199	365	664	927	1147	1095	840	520	183	40	6089
40 S	30	110	308	673	1338	2265	3411	4507	5347	5867	6050	6089	6089
45 M	5	28	100	235	511	777	992	940	690	373	89	8	4748
45 S	5	33	133	368	879	1656	2648	3588	4278	4651	4740	4748	4748
50 M	0	6	39	129	364	627	837	785	541	240	32	1	3602
50 S	0	7	45	175	539	1166	2003	2788	3329	3569	3601	3602	3602
55 M	0	1	10	55	230	479	682	630	394	127	6	0	2614
55 S	0	1	11	66	296	775	1457	2087	2480	2607	2614	2614	2614
60 M	0	0	1	16	119	334	527	475	252	49	0	0	1774
60 S	0	0	1	18	136	470	997	1472	1724	1773	1774	1774	1774

Corn Growing Degree Days
50 M	36	69	151	252	427	582	722	704	542	342	138	45	4008
50 S	36	105	256	507	934	1516	2237	2941	3483	3825	3963	4008	4008

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