PHOENIX S MTN, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(026479) PHOENIX SOUTH MOUNTAIN
From Year=1975 To Year=1983
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	387	449	540	803	1047	1412	1489	1477	1292	1020	655	472	11044
40 S	387	836	1376	2179	3227	4639	6128	7605	8897	9917	10572	11044	11044
45 M	248	311	387	653	892	1262	1334	1322	1142	865	507	324	9247
45 S	248	559	946	1599	2491	3753	5087	6409	7551	8416	8923	9247	9247
50 M	130	189	245	506	737	1112	1179	1167	992	710	365	191	7524
50 S	130	319	564	1070	1808	2920	4099	5266	6258	6968	7333	7524	7524
55 M	53	92	131	370	582	962	1024	1012	842	555	234	91	5949
55 S	53	145	276	646	1229	2191	3215	4227	5069	5624	5858	5949	5949
60 M	13	33	57	246	430	812	869	857	692	404	131	30	4574
60 S	13	46	103	349	780	1592	2460	3317	4009	4413	4544	4574	4574

Corn Growing Degree Days
50 M	167	219	284	519	705	944	989	994	886	688	380	223	6999
50 S	167	386	670	1189	1894	2838	3828	4821	5707	6395	6775	6999	6999

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