FOUNTAIN HILLS, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023190) FOUNTAIN HILLS
From Year=1979 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	436	475	687	882	1185	1412	1593	1577	1369	1072	652	420	11758
40 S	436	910	1597	2479	3664	5076	6669	8246	9614	10686	11338	11758	11758
45 M	284	336	532	732	1030	1262	1438	1422	1219	917	502	271	9944
45 S	284	620	1152	1884	2914	4176	5614	7036	8254	9171	9674	9944	9944
50 M	150	206	379	583	875	1112	1283	1267	1069	762	357	141	8183
50 S	150	355	734	1317	2192	3304	4587	5854	6922	7684	8041	8183	8183
55 M	55	99	238	435	720	962	1128	1112	919	608	224	52	6550
55 S	55	154	392	827	1546	2508	3636	4748	5667	6275	6499	6550	6550
60 M	11	34	124	296	565	812	973	957	769	456	116	11	5123
60 S	11	45	170	465	1030	1842	2815	3772	4541	4996	5112	5123	5123

Corn Growing Degree Days
50 M	256	285	423	550	734	843	975	977	857	685	404	247	7236
50 S	256	542	964	1514	2248	3091	4066	5043	5900	6585	6989	7236	7236

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