RALSTON RSVR, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(056816) RALSTON RESERVOIR
From Year=1978 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 51 39 151 262 523 807 1066 966 688 362 151 44 5109
40 S 51 90 241 503 1026 1833 2899 3864 4552 4914 5065 5109 5109
45 M 16 13 77 158 384 657 911 811 541 235 81 14 3898
45 S 16 29 106 264 648 1305 2216 3027 3568 3803 3884 3898 3898
50 M 3 3 32 80 257 510 756 656 399 133 35 3 2866
50 S 3 6 38 117 374 884 1640 2296 2695 2829 2864 2866 2866
55 M 0 0 10 32 149 367 601 502 267 61 11 0 2000
55 S 0 0 10 43 192 559 1160 1662 1928 1989 2000 2000 2000
60 M 0 0 1 9 69 235 448 350 152 20 1 0 1286
60 S 0 0 1 10 79 314 763 1113 1265 1285 1286 1286 1286
Corn Growing Degree Days
50 M 38 34 111 175 317 502 699 631 427 221 102 32 3289
50 S 38 73 184 359 675 1177 1876 2508 2934 3155 3257 3289 3289
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