ST IGNATIUS, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(247286) ST IGNATIUS
From Year=1896 To Year=2010
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	10	14	56	194	418	606	842	797	494	211	40	14	3695
40 S	10	24	79	273	691	1297	2139	2936	3430	3641	3681	3695	3695
45 M	2	3	16	92	272	457	687	642	348	105	12	3	2639
45 S	2	4	20	112	384	840	1528	2170	2518	2624	2636	2639	2639
50 M	0	0	3	35	150	310	532	487	215	41	2	0	1776
50 S	0	0	3	38	188	498	1030	1517	1732	1774	1776	1776	1776
55 M	0	0	0	9	66	178	378	335	108	11	0	0	1084
55 S	0	0	0	9	75	253	631	966	1074	1084	1084	1084	1084
60 M	0	0	0	1	21	82	233	193	40	1	0	0	572
60 S	0	0	0	1	22	104	337	530	570	572	572	572	572

Corn Growing Degree Days
50 M	3	7	44	142	273	377	534	511	326	144	20	5	2384
50 S	3	10	54	196	469	846	1379	1890	2216	2360	2379	2384	2384

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