DUNCAN, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(022754) DUNCAN
From Year=1901 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	96	172	345	543	812	1056	1243	1182	960	647	269	92	7416
40 S	96	267	612	1155	1967	3023	4266	5448	6408	7055	7324	7416	7416
45 M	27	73	203	394	657	906	1088	1027	810	492	143	26	5846
45 S	27	100	303	698	1354	2260	3348	4376	5185	5677	5820	5846	5846
50 M	4	20	91	251	502	756	933	872	660	341	52	4	4487
50 S	4	24	116	367	869	1625	2558	3430	4090	4431	4483	4487	4487
55 M	0	3	27	127	350	606	778	717	510	200	12	0	3330
55 S	0	3	30	157	507	1113	1891	2608	3118	3318	3329	3330	3330
60 M	0	0	4	44	206	456	623	562	360	89	1	0	2347
60 S	0	0	4	49	255	711	1334	1896	2256	2345	2347	2347	2347

Corn Growing Degree Days
50 M	156	204	320	430	543	623	770	749	608	470	273	153	5299
50 S	156	360	680	1110	1653	2276	3046	3795	4403	4873	5146	5299	5299

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