CHICAGO MIDWAY AP 3 SW, ILLINOIS

Period of Record General Climate Summary - Growing Degree Days

Station:(111577) CHICAGO MIDWAY AP 3 SW
From Year=1928 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 9 16 102 308 630 914 1102 1050 788 461 134 23 5538
40 S 9 25 127 434 1065 1979 3081 4131 4919 5380 5514 5538 5538
45 M 2 5 56 196 479 764 947 895 638 320 70 8 4380
45 S 2 8 63 259 738 1502 2449 3344 3982 4302 4372 4380 4380
50 M 0 1 28 114 337 615 792 740 489 201 32 3 3351
50 S 0 2 30 143 480 1095 1887 2627 3116 3317 3349 3351 3351
55 M 0 0 12 59 216 466 637 585 345 112 12 1 2445
55 S 0 0 12 71 287 753 1390 1976 2320 2432 2444 2445 2445
60 M 0 0 5 27 124 325 482 431 216 53 3 0 1666
60 S 0 0 5 31 155 480 962 1393 1609 1662 1666 1666 1666
Corn Growing Degree Days
50 M 4 8 58 169 369 596 758 718 492 251 63 9 3497
50 S 4 12 70 239 608 1205 1963 2681 3173 3425 3487 3497 3497
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