YELLOWTAIL DAM, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(249240) YELLOWTAIL DAM
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	42	61	129	300	558	791	1060	1032	689	391	121	51	5225
40 S	42	103	232	532	1089	1880	2940	3972	4661	5052	5173	5225	5225
45 M	15	24	62	186	409	641	905	877	543	261	59	20	4003
45 S	15	39	102	288	697	1338	2243	3120	3663	3924	3983	4003	4003
50 M	4	8	24	99	271	492	750	722	402	153	22	6	2955
50 S	4	11	36	135	406	899	1649	2371	2773	2926	2948	2955	2955
55 M	1	2	8	45	156	346	595	568	272	76	6	2	2078
55 S	1	3	11	56	212	559	1154	1722	1994	2070	2076	2078	2078
60 M	0	0	2	16	73	216	442	415	160	30	1	0	1357
60 S	0	0	3	19	92	308	750	1165	1325	1355	1357	1357	1357

Corn Growing Degree Days
50 M	24	40	94	198	340	489	666	644	431	254	77	32	3287
50 S	24	63	157	355	695	1184	1850	2494	2924	3178	3255	3287	3287

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