FLAGSTAFF 4 SW, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023009) FLAGSTAFF 4 SW
From Year=1984 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	1	3	25	100	269	481	720	673	442	173	24	2	2913
40 S	1	4	29	129	398	879	1599	2272	2714	2887	2911	2913	2913
45 M	0	0	3	31	142	333	565	518	295	70	3	0	1961
45 S	0	0	3	34	176	509	1074	1592	1888	1958	1961	1961	1961
50 M	0	0	0	5	52	194	410	364	162	19	0	0	1207
50 S	0	0	0	5	58	252	662	1026	1187	1206	1207	1207	1207
55 M	0	0	0	1	13	87	257	213	61	3	0	0	634
55 S	0	0	0	1	13	100	357	570	631	634	634	634	634
60 M	0	0	0	0	1	26	120	84	12	0	0	0	242
60 S	0	0	0	0	1	27	147	230	242	242	242	242	242

Corn Growing Degree Days
50 M	15	22	67	141	274	405	489	449	346	209	73	20	2508
50 S	15	37	104	245	519	924	1413	1861	2207	2416	2488	2508	2508

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