AJO, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(020080) AJO
From Year=1914 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	403	484	665	864	1137	1374	1562	1505	1340	1063	662	457	11516
40 S	403	886	1552	2416	3553	4927	6489	7994	9335	10398	11059	11516	11516
45 M	258	346	511	714	982	1224	1407	1350	1190	908	512	309	9712
45 S	258	604	1115	1829	2811	4035	5442	6793	7983	8891	9403	9712	9712
50 M	135	218	360	565	827	1074	1252	1195	1040	753	367	176	7962
50 S	135	353	713	1278	2105	3179	4431	5626	6666	7419	7786	7962	7962
55 M	52	113	224	417	672	924	1097	1040	890	599	233	78	6340
55 S	52	165	389	806	1479	2402	3499	4540	5430	6029	6262	6340	6340
60 M	12	45	115	280	519	774	942	885	740	447	125	24	4909
60 S	12	57	172	453	971	1745	2687	3572	4313	4760	4885	4909	4909

Corn Growing Degree Days
50 M	225	279	399	549	735	868	988	964	867	693	401	255	7225
50 S	225	504	903	1453	2187	3055	4043	5008	5875	6568	6969	7225	7225

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