WEST YELLOWSTONE, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(248857) WEST YELLOWSTONE
From Year=1924 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1643	1367	1290	941	651	393	179	245	513	858	1278	1596	10952
60	1488	1226	1135	791	496	251	68	113	364	703	1128	1441	9201
57	1395	1141	1042	701	404	176	31	60	278	610	1038	1348	8222
55	1333	1085	980	641	344	133	17	37	225	548	978	1286	7604
50	1178	943	825	491	207	56	3	9	115	394	828	1131	6178

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
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