OLD FAITHFUL, WYOMING

Period of Record General Climate Summary - Heating Degree Days

Station:(486845) OLD FAITHFUL
From Year=1904 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	1580	1372	1260	965	731	462	249	294	547	885	1259	1574	11177
60	1425	1230	1105	815	576	316	120	155	398	730	1109	1419	9397
57	1332	1145	1012	725	483	235	64	89	310	637	1019	1326	8377
55	1270	1089	950	665	422	185	39	57	254	575	959	1264	7728
50	1115	947	795	515	274	87	9	15	134	421	809	1109	6230

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