BOULDER, COLORADO

Period of Record General Climate Summary - Cooling Degree Days

Station:(050848) BOULDER
From Year=1893 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
55 0 1 8 37 141 357 543 500 265 73 7 1 1934
57 0 1 4 23 105 301 481 438 216 50 3 0 1622
60 0 0 1 10 61 223 389 346 148 25 1 0 1204
65 0 0 0 1 18 114 240 199 63 5 0 0 640
70 0 0 0 0 3 42 110 80 16 0 0 0 251
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 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