YELLOWTAIL DAM, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(249240) YELLOWTAIL DAM
From Year=1948 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	41	57	130	292	547	787	1068	1033	683	387	122	48	5195
40 S	41	98	228	520	1067	1854	2922	3955	4638	5025	5147	5195	5195
45 M	15	22	63	180	399	638	913	878	537	257	59	19	3978
45 S	15	37	100	279	678	1316	2229	3107	3643	3901	3959	3978	3978
50 M	4	7	24	95	263	489	758	723	396	150	23	6	2938
50 S	4	11	35	131	393	882	1640	2363	2759	2909	2932	2938	2938
55 M	1	2	8	43	151	344	603	569	267	75	6	2	2069
55 S	1	2	10	54	205	548	1151	1720	1986	2061	2067	2069	2069
60 M	0	0	2	16	70	213	450	416	156	30	1	0	1355
60 S	0	0	2	18	89	302	752	1168	1324	1353	1355	1355	1355

Corn Growing Degree Days
50 M	23	37	94	192	332	487	671	646	428	249	78	30	3267
50 S	23	60	155	347	678	1165	1836	2482	2910	3159	3237	3267	3267

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