SOUTH PHOENIX, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(028112) SOUTH PHOENIX
From Year=1961 To Year=2007
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	390	462	645	814	1088	1286	1498	1464	1256	962	580	379	10823
40 S	390	851	1496	2311	3399	4685	6183	7646	8902	9865	10445	10823	10823
45 M	243	322	490	664	933	1136	1343	1309	1106	807	431	232	9017
45 S	243	565	1056	1720	2653	3789	5132	6441	7546	8354	8785	9017	9017
50 M	118	191	339	514	778	986	1188	1154	956	653	286	107	7269
50 S	118	309	648	1162	1940	2926	4114	5268	6223	6876	7162	7269	7269
55 M	38	86	199	366	623	836	1033	999	806	499	160	30	5673
55 S	38	124	323	689	1312	2148	3181	4180	4985	5484	5643	5673	5673
60 M	7	24	93	228	469	686	878	844	656	347	64	3	4298
60 S	7	31	124	352	820	1506	2384	3228	3884	4231	4295	4298	4298

Corn Growing Degree Days
50 M	256	303	416	519	673	773	933	923	794	617	372	248	6828
50 S	256	559	975	1495	2168	2941	3874	4797	5591	6208	6580	6828	6828

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