ROCHESTER INTL AP, MINNESOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(217004) ROCHESTER WSO AP
From Year=1893 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 2 40 205 527 803 968 889 603 293 50 3 4384
40 S 0 2 42 247 774 1578 2545 3435 4038 4330 4381 4384 4384
45 M 0 0 18 119 380 654 813 734 456 182 21 1 3379
45 S 0 0 19 137 517 1171 1983 2718 3174 3357 3378 3379 3379
50 M 0 0 7 61 249 504 658 580 319 101 7 0 2486
50 S 0 0 7 69 317 821 1479 2059 2377 2478 2485 2486 2486
55 M 0 0 3 28 144 359 503 426 200 48 2 0 1713
55 S 0 0 3 31 176 535 1037 1463 1663 1711 1712 1713 1713
60 M 0 0 1 11 72 226 349 278 109 18 0 0 1066
60 S 0 0 1 12 84 311 660 938 1047 1065 1066 1066 1066
Corn Growing Degree Days
50 M 0 1 26 128 312 509 640 578 366 173 29 2 2763
50 S 0 1 27 155 467 976 1616 2193 2560 2732 2761 2763 2763
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