KALISPELL WSO AIRPORT, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(244558) KALISPELL WSO AIRPORT
From Year=1899 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	1	2	21	142	366	548	778	729	422	147	13	2	3171
40 S	1	3	25	166	532	1080	1858	2587	3009	3155	3169	3171	3171
45 M	0	0	3	60	224	399	623	574	281	61	2	0	2227
45 S	0	0	3	63	287	685	1308	1882	2163	2224	2226	2227	2227
50 M	0	0	0	19	114	255	468	420	159	17	0	0	1453
50 S	0	0	0	19	133	389	857	1277	1436	1453	1453	1453	1453
55 M	0	0	0	5	46	134	316	272	71	3	0	0	846
55 S	0	0	0	5	50	184	500	773	843	846	846	846	846
60 M	0	0	0	1	14	55	179	145	22	0	0	0	416
60 S	0	0	0	1	14	70	248	393	416	416	416	416	416

Corn Growing Degree Days
50 M	0	1	18	100	224	324	487	459	272	103	6	1	1995
50 S	0	1	19	120	344	667	1155	1614	1886	1989	1995	1995	1995

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