BOULDER, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(050848) BOULDER
From Year=1948 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 52 67 141 301 564 819 1027 974 701 419 142 63 5272
40 S 52 119 260 562 1126 1945 2972 3946 4647 5067 5209 5272 5272
45 M 18 27 68 185 414 670 872 819 554 282 71 24 4004
45 S 18 45 113 299 712 1382 2254 3073 3627 3909 3980 4004 4004
50 M 4 8 26 97 274 520 717 664 410 166 27 7 2920
50 S 4 13 39 136 410 930 1647 2311 2721 2887 2914 2920 2920
55 M 1 2 7 40 156 375 562 509 275 80 7 1 2014
55 S 1 2 10 50 206 580 1142 1652 1927 2006 2013 2014 2014
60 M 0 0 1 12 69 239 408 356 157 29 1 0 1271
60 S 0 0 1 13 82 321 729 1085 1242 1271 1271 1271 1271
Corn Growing Degree Days
50 M 45 55 112 207 351 515 664 632 446 280 106 52 3466
50 S 45 100 213 420 771 1286 1950 2582 3028 3308 3414 3466 3466
M = Monthly Data
S - Running sum of monthly data.
Growing 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.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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