TUCSON INTL AP, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(028820) TUCSON WSO AP
From Year=1930 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	370	417	595	788	1074	1318	1447	1391	1234	957	582	379	10551
40 S	370	787	1381	2170	3243	4561	6008	7399	8633	9590	10172	10551	10551
45 M	229	282	441	638	919	1168	1292	1236	1084	802	434	237	8762
45 S	229	510	952	1590	2509	3676	4968	6204	7288	8091	8525	8762	8762
50 M	111	162	295	489	764	1018	1137	1081	934	648	294	120	7053
50 S	111	273	569	1058	1821	2839	3976	5057	5991	6639	6933	7053	7053
55 M	37	73	169	345	609	868	982	926	784	495	172	41	5500
55 S	37	110	279	624	1232	2100	3082	4008	4792	5287	5459	5500	5500
60 M	7	21	75	214	456	718	827	771	634	347	78	7	4153
60 S	7	27	102	316	771	1489	2316	3087	3721	4068	4146	4153	4153

Corn Growing Degree Days
50 M	235	263	373	500	676	811	929	906	804	617	363	240	6716
50 S	235	497	870	1371	2047	2857	3786	4692	5496	6114	6476	6716	6716

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