PLENTYWOOD, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(246586) PLENTYWOOD
From Year=1906 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	0	2	33	181	456	713	900	857	529	182	16	0	3870
40 S	0	2	35	216	672	1386	2286	3143	3672	3853	3870	3870	3870
45 M	0	0	10	98	316	564	745	702	386	95	4	0	2920
45 S	0	0	10	108	424	987	1733	2435	2821	2916	2920	2920	2920
50 M	0	0	3	46	194	417	590	548	257	42	1	0	2098
50 S	0	0	3	49	243	660	1250	1798	2055	2097	2098	2098	2098
55 M	0	0	0	18	102	278	435	395	153	15	0	0	1396
55 S	0	0	0	18	120	398	833	1228	1381	1396	1396	1396	1396
60 M	0	0	0	5	44	162	286	253	76	5	0	0	831
60 S	0	0	0	5	49	211	497	749	826	831	831	831	831

Corn Growing Degree Days
50 M	1	6	44	158	309	447	568	544	364	162	24	1	2627
50 S	1	6	50	208	516	964	1532	2076	2440	2603	2627	2627	2627

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