TUCSON 17 NW, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(028795) TUCSON 17 NW
From Year=1982 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	422	450	657	838	1137	1367	1490	1436	1279	1002	624	394	11096
40 S	422	871	1528	2367	3503	4871	6361	7797	9076	10078	10702	11096	11096
45 M	277	313	502	689	982	1217	1335	1281	1129	847	475	254	9301
45 S	277	590	1092	1781	2763	3980	5315	6596	7725	8573	9047	9301	9301
50 M	151	188	353	540	827	1067	1180	1126	979	692	332	137	7573
50 S	151	339	692	1232	2059	3126	4307	5433	6412	7104	7436	7573	7573
55 M	62	92	219	395	672	917	1025	971	829	538	206	54	5980
55 S	62	154	373	768	1439	2357	3382	4353	5182	5720	5926	5980	5980
60 M	18	32	114	262	517	767	870	816	679	387	106	12	4581
60 S	18	50	164	426	943	1710	2581	3397	4076	4462	4569	4581	4581

Corn Growing Degree Days
50 M	261	276	410	534	717	841	943	921	823	645	390	245	7006
50 S	261	537	947	1481	2197	3038	3981	4903	5725	6371	6761	7006	7006

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