BOULDER, COLORADO

Period of Record General Climate Summary - Cooling Degree Days

Station:(050848) BOULDER
From Year=1948 To Year=2006
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	1	2	7	40	156	375	562	509	275	80	7	1	2014
57	0	1	4	26	117	319	500	448	225	55	3	1	1698
60	0	0	1	12	69	239	408	356	157	29	1	0	1271
65	0	0	0	2	22	126	257	208	69	7	0	0	691
70	0	0	0	0	5	48	123	85	20	1	0	0	280

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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