FT LEWIS, COLORADO

Period of Record General Climate Summary - Heating Degree Days

Station:(053016) FORT LEWIS
From Year=1915 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	1307	1085	990	715	476	196	48	89	274	596	943	1241	7960
60	1152	944	835	565	323	89	6	17	139	441	793	1086	6390
57	1059	859	742	475	237	48	1	4	78	349	703	993	5549
55	997	803	680	416	185	30	0	1	50	290	643	931	5026
50	842	662	525	272	85	7	0	0	13	160	493	776	3834

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