MERRILL, WISCONSIN

Period of Record General Climate Summary - Growing Degree Days

Station:(475364) MERRILL
From Year=1905 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 22 154 462 726 899 819 533 230 31 1 3878
40 S 0 1 23 177 639 1364 2263 3083 3616 3846 3877 3878 3878
45 M 0 0 9 82 321 576 744 664 389 132 11 0 2928
45 S 0 0 9 92 412 988 1732 2397 2786 2917 2928 2928 2928
50 M 0 0 4 39 200 428 589 510 258 65 3 0 2094
50 S 0 0 4 42 242 670 1259 1768 2026 2091 2094 2094 2094
55 M 0 0 1 16 109 287 434 357 151 26 1 0 1383
55 S 0 0 1 17 127 414 848 1205 1356 1382 1383 1383 1383
60 M 0 0 0 6 50 167 284 217 76 8 0 0 809
60 S 0 0 0 6 56 224 508 725 800 809 809 809 809
Corn Growing Degree Days
50 M 0 1 18 113 293 458 583 525 328 144 20 1 2485
50 S 0 1 19 132 426 883 1467 1992 2320 2464 2484 2485 2485
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