TWIN LAKES RSVR, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(058501) TWIN LAKES RESERVOIR
From Year=1949 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 0 1 14 137 358 552 500 282 73 5 0 1923
40 S 0 0 1 15 153 511 1063 1563 1845 1918 1923 1923 1923
45 M 0 0 0 1 50 218 398 345 149 19 0 0 1181
45 S 0 0 0 1 51 269 666 1012 1161 1180 1181 1181 1181
50 M 0 0 0 0 10 100 244 193 50 3 0 0 600
50 S 0 0 0 0 10 110 354 548 597 600 600 600 600
55 M 0 0 0 0 1 26 104 68 7 0 0 0 207
55 S 0 0 0 0 1 27 131 199 207 207 207 207 207
60 M 0 0 0 0 0 2 21 9 0 0 0 0 33
60 S 0 0 0 0 0 2 23 32 33 33 33 33 33
Corn Growing Degree Days
50 M 1 1 9 31 130 268 367 328 219 90 15 1 1460
50 S 1 2 10 41 171 439 806 1135 1354 1444 1459 1460 1460
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