CRESTON, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(242104) CRESTON
From Year=1949 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	2	3	19	129	357	543	752	718	414	136	17	2	3091
40 S	2	5	24	152	509	1052	1804	2522	2936	3072	3089	3091	3091
45 M	0	0	3	52	217	394	597	563	273	54	3	0	2157
45 S	0	0	3	55	273	666	1263	1826	2099	2154	2157	2157	2157
50 M	0	0	0	16	111	251	442	408	152	14	0	0	1396
50 S	0	0	0	17	127	378	820	1229	1381	1395	1396	1396	1396
55 M	0	0	0	3	44	132	292	260	65	2	0	0	798
55 S	0	0	0	3	47	180	471	731	796	798	798	798	798
60 M	0	0	0	0	12	54	159	133	19	0	0	0	377
60 S	0	0	0	0	13	67	225	359	377	377	377	377	377

Corn Growing Degree Days
50 M	0	1	17	95	225	324	475	460	284	102	7	0	1990
50 S	0	1	18	113	338	661	1136	1596	1880	1982	1989	1990	1990

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