DULUTH HARBOR STN, MINNESOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(212246) DULUTH HARBOR STN
From Year=1933 To Year=2004
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 4 59 257 516 803 783 520 226 27 1 3196
40 S 0 0 5 64 321 837 1639 2423 2942 3168 3195 3196 3196
45 M 0 0 1 22 142 367 648 628 372 115 7 0 2303
45 S 0 0 1 23 165 532 1180 1808 2180 2295 2303 2303 2303
50 M 0 0 0 7 68 230 493 474 233 46 1 0 1553
50 S 0 0 0 7 75 305 798 1272 1505 1551 1553 1553 1553
55 M 0 0 0 2 27 124 341 321 121 13 0 0 948
55 S 0 0 0 2 28 152 493 814 935 948 948 948 948
60 M 0 0 0 0 9 52 203 182 48 2 0 0 497
60 S 0 0 0 0 10 62 265 447 495 497 497 497 497
Corn Growing Degree Days
50 M 0 0 3 33 120 261 494 477 260 81 8 0 1736
50 S 0 0 3 36 156 416 910 1386 1647 1728 1736 1736 1736
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