FT LEWIS, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(053016) FORT LEWIS
From Year=1915 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 0 1 20 104 307 567 771 705 477 207 20 1 3179
40 S 0 1 21 125 432 999 1770 2475 2952 3158 3178 3179 3179
45 M 0 0 3 35 174 418 616 550 330 96 2 0 2224
45 S 0 0 3 38 213 630 1246 1796 2125 2222 2224 2224 2224
50 M 0 0 0 7 74 273 461 395 190 29 0 0 1429
50 S 0 0 0 7 81 354 815 1210 1400 1429 1429 1429 1429
55 M 0 0 0 0 19 146 306 241 77 4 0 0 794
55 S 0 0 0 0 20 166 472 713 790 794 794 794 794
60 M 0 0 0 0 2 56 157 102 16 0 0 0 332
60 S 0 0 0 0 2 58 215 317 332 332 332 332 332
Corn Growing Degree Days
50 M 2 5 32 113 248 402 494 446 326 179 37 4 2287
50 S 2 6 38 151 400 802 1295 1741 2067 2246 2283 2287 2287
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 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