YELLOWSTONE PK MAMMOTH, WYOMING

Period of Record General Climate Summary - Heating Degree Days

Station:(489905) YELLOWSTONE PARK
From Year=1894 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	1397	1193	1132	814	556	309	94	122	375	703	1072	1350	9117
60	1242	1052	977	664	404	183	32	44	239	549	922	1195	7502
57	1149	967	884	574	317	123	15	21	172	457	832	1102	6613
55	1087	911	822	514	263	90	9	12	134	397	772	1040	6052
50	932	770	667	369	149	34	2	3	66	259	622	885	4758

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