PHOENIX SKY HARBOR INTL AP, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(026481) PHOENIX WSFO AP
From Year=1933 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	433	488	701	906	1209	1440	1647	1596	1383	1073	657	439	11973
40 S	433	921	1622	2529	3738	5177	6825	8421	9804	10877	11534	11973	11973
45 M	285	349	546	756	1054	1290	1492	1441	1233	918	507	289	10160
45 S	285	634	1180	1936	2990	4280	5772	7213	8446	9365	9871	10160	10160
50 M	152	218	393	606	899	1140	1337	1286	1083	763	360	154	8392
50 S	152	370	763	1369	2269	3408	4745	6031	7115	7878	8238	8392	8392
55 M	57	109	250	458	744	990	1182	1131	933	609	225	57	6745
55 S	57	166	417	874	1618	2608	3790	4921	5855	6463	6689	6745	6745
60 M	13	39	133	316	589	840	1027	976	783	456	115	10	5298
60 S	13	52	185	501	1090	1929	2957	3933	4716	5172	5288	5298	5298

Corn Growing Degree Days
50 M	257	295	435	578	767	884	1039	1017	885	696	411	261	7524
50 S	257	552	986	1565	2331	3215	4254	5271	6156	6852	7263	7524	7524

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