CHINOOK, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(241722) CHINOOK
From Year=1948 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	6	8	39	185	474	692	906	857	502	225	32	7	3933
40 S	6	14	53	238	712	1404	2311	3167	3669	3894	3926	3933	3933
45 M	2	2	11	95	329	543	751	702	360	123	11	2	2930
45 S	2	3	15	110	439	981	1733	2434	2794	2917	2928	2930	2930
50 M	0	0	2	40	198	394	596	547	231	55	3	0	2067
50 S	0	1	3	43	241	635	1232	1779	2010	2065	2067	2067	2067
55 M	0	0	0	14	99	253	442	394	125	17	1	0	1344
55 S	0	0	0	14	113	365	807	1201	1326	1343	1344	1344	1344
60 M	0	0	0	3	38	134	290	250	53	4	0	0	773
60 S	0	0	0	3	42	176	466	716	769	773	773	773	773

Corn Growing Degree Days
50 M	6	13	48	157	312	429	568	540	345	192	39	9	2657
50 S	6	19	67	224	535	964	1532	2072	2417	2610	2649	2657	2657

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 Jul 28, 2006
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