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Period of Record General Climate Summary - Growing Degree Days

Station:(479236) WILLOW RESERVOIR
From Year=1934 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 12 114 401 662 831 758 480 202 25 1 3487
40 S 0 0 13 127 528 1190 2021 2779 3259 3461 3486 3487 3487
45 M 0 0 4 58 267 513 676 603 338 111 9 0 2578
45 S 0 0 4 62 329 841 1517 2120 2458 2569 2578 2578 2578
50 M 0 0 1 26 159 367 521 449 213 52 3 0 1790
50 S 0 0 1 26 186 552 1073 1522 1736 1787 1790 1790 1790
55 M 0 0 0 10 82 233 367 300 117 20 1 0 1130
55 S 0 0 0 10 92 325 692 992 1109 1129 1130 1130 1130
60 M 0 0 0 3 35 124 223 169 55 5 0 0 615
60 S 0 0 0 3 38 162 385 554 609 615 615 615 615
Corn Growing Degree Days
50 M 0 0 10 86 257 409 531 476 285 120 14 0 2190
50 S 0 0 10 96 354 763 1294 1770 2055 2175 2189 2190 2190
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