CROW AGENCY, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(242112) CROW AGENCY
From Year=1898 To Year=1991
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	4	11	58	223	494	742	987	906	569	285	43	7	4328
40 S	4	15	73	295	789	1531	2519	3425	3994	4279	4321	4328	4328
45 M	1	2	20	121	347	592	832	751	423	164	11	1	3267
45 S	1	3	23	144	491	1083	1916	2667	3090	3255	3266	3267	3267
50 M	0	0	5	54	215	443	677	596	286	74	2	0	2353
50 S	0	1	6	59	274	718	1395	1991	2277	2351	2353	2353	2353
55 M	0	0	1	17	111	300	523	442	165	22	0	0	1581
55 S	0	0	1	18	129	429	951	1394	1558	1581	1581	1581	1581
60 M	0	0	0	3	46	175	369	293	76	4	0	0	965
60 S	0	0	0	3	49	224	593	886	961	965	965	965	965

Corn Growing Degree Days
50 M	7	17	68	188	332	465	605	562	394	249	62	12	2961
50 S	7	24	92	280	613	1078	1682	2244	2638	2887	2949	2961	2961

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