KEYSTONE, SOUTH DAKOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(394556) KEYSTONE
From Year=1990 To Year=1997
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 8 21 55 111 341 600 737 772 491 201 26 9 3371
40 S 8 28 83 194 536 1135 1872 2644 3135 3336 3362 3371 3371
45 M 1 4 20 51 213 452 582 618 351 111 6 1 2410
45 S 1 5 25 76 289 741 1323 1940 2291 2402 2409 2410 2410
50 M 0 0 5 20 112 308 427 465 227 53 1 0 1616
50 S 0 0 5 24 136 443 870 1335 1562 1615 1616 1616 1616
55 M 0 0 0 6 51 177 275 315 124 19 0 0 967
55 S 0 0 0 6 57 233 508 823 947 967 967 967 967
60 M 0 0 0 1 17 75 141 175 54 3 0 0 466
60 S 0 0 0 1 18 93 234 409 463 466 466 466 466
Corn Growing Degree Days
50 M 14 33 64 96 211 354 443 474 317 164 36 16 2223
50 S 14 48 112 207 418 773 1216 1690 2007 2171 2207 2223 2223
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