GRANITE REEF DAM, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023621) GRANITE REEF DAM
From Year=1893 To Year=1979
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	429	617	807	1066	1287	1535	1490	1290	985	627	408	10918
40 S	376	805	1422	2229	3295	4582	6117	7608	8897	9883	10510	10918	10918
45 M	232	291	462	657	911	1137	1380	1335	1140	830	478	260	9115
45 S	232	524	986	1643	2554	3691	5071	6406	7546	8377	8854	9115	9115
50 M	112	166	312	507	756	987	1225	1180	990	676	331	134	7376
50 S	112	278	590	1097	1853	2840	4065	5245	6235	6911	7242	7376	7376
55 M	36	71	176	359	602	837	1070	1025	840	521	197	48	5783
55 S	36	107	283	642	1244	2081	3151	4177	5016	5538	5735	5783	5783
60 M	7	19	75	222	448	687	915	870	690	370	91	11	4405
60 S	7	26	101	323	771	1458	2373	3244	3933	4303	4394	4405	4405

Corn Growing Degree Days
50 M	249	282	402	512	646	753	934	922	801	623	403	265	6791
50 S	249	530	932	1445	2090	2843	3777	4699	5500	6123	6526	6791	6791

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