TUCSON WFO, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(028815) TUCSON UNIV OF ARIZONA
From Year=1894 To Year=2008
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	363	413	596	780	1060	1299	1458	1401	1232	943	575	380	10499
40 S	363	776	1372	2153	3213	4512	5969	7370	8601	9544	10120	10499	10499
45 M	223	278	442	631	905	1149	1303	1246	1082	788	428	237	8710
45 S	223	501	943	1574	2479	3628	4930	6176	7257	8045	8473	8710	8710
50 M	110	159	295	481	750	999	1148	1091	932	633	287	119	7003
50 S	110	268	563	1044	1794	2793	3941	5031	5963	6596	6883	7003	7003
55 M	37	70	167	336	596	849	993	936	782	480	163	42	5450
55 S	37	107	275	611	1207	2055	3048	3983	4765	5245	5408	5450	5450
60 M	7	20	74	205	443	699	838	781	632	331	70	9	4108
60 S	7	27	102	307	749	1448	2286	3066	3698	4029	4099	4108	4108

Corn Growing Degree Days
50 M	245	273	389	503	667	791	928	905	791	610	379	255	6736
50 S	245	518	907	1410	2077	2868	3796	4701	5493	6102	6481	6736	6736

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