CANYON DE CHELLY, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(021634) CHINLE
From Year=1908 To Year=1970
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	12	33	119	316	605	871	1084	1024	755	420	91	15	5345
40 S	12	45	163	479	1084	1955	3039	4063	4818	5238	5329	5345	5345
45 M	2	7	45	190	452	721	929	869	605	278	32	3	4131
45 S	2	9	54	244	696	1417	2346	3215	3820	4097	4129	4131	4131
50 M	0	1	11	92	306	571	774	714	457	156	6	0	3087
50 S	0	1	11	104	409	980	1754	2468	2925	3081	3087	3087	3087
55 M	0	0	1	32	176	422	619	559	313	67	0	0	2189
55 S	0	0	1	33	209	631	1250	1809	2122	2189	2189	2189	2189
60 M	0	0	0	6	75	279	464	404	180	18	0	0	1427
60 S	0	0	0	6	82	361	825	1229	1409	1427	1427	1427	1427

Corn Growing Degree Days
50 M	19	49	136	258	428	557	685	660	498	325	115	26	3756
50 S	19	68	203	461	890	1447	2132	2792	3290	3615	3730	3756	3756

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