BOULDER, COLORADO

Period of Record General Climate Summary - Heating Degree Days

Station:(050848) BOULDER
From Year=1893 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	1001	856	758	487	256	63	7	9	122	391	709	955	5616
60	846	715	604	346	144	22	1	1	58	256	560	800	4353
57	753	631	514	269	95	10	0	0	35	188	473	708	3676
55	692	575	456	223	69	6	0	0	25	149	416	646	3257
50	540	439	320	128	28	1	0	0	10	78	286	496	2326

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