OLD FAITHFUL, WYOMING

Period of Record General Climate Summary - Heating Degree Days

Station:(486845) OLD FAITHFUL
From Year=1978 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1574	1372	1265	971	723	464	262	310	556	906	1302	1605	11309
60	1419	1231	1110	821	568	318	130	166	407	751	1152	1450	9522
57	1326	1147	1017	731	475	235	72	97	319	658	1062	1357	8495
55	1264	1090	955	671	414	186	44	64	263	596	1002	1295	7844
50	1109	949	800	521	267	91	11	19	143	442	852	1140	6343

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 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