BOULDER, COLORADO

Period of Record General Climate Summary - Heating Degree Days

Station:(050848) BOULDER
From Year=1948 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	991	823	745	477	234	57	5	9	120	376	721	929	5487
60	836	682	591	337	126	20	1	1	57	243	572	774	4241
57	743	598	501	261	81	10	0	0	35	176	484	682	3572
55	681	543	442	215	58	6	0	0	25	139	428	620	3158
50	530	408	307	122	21	1	0	0	10	70	298	471	2237

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