Historical Climate Data

Growing Season Summary
Station: 476200 OCONOMOWOC 1 SW, WI

Growing Degree Day Averages
Derived from 1971-2000 Data

 

Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40		 1 6 61 233 555 812 985 914 632 310 74 8 4588
GDD
Base 45		 0 1 30 138 406 663 831 760 484 190 35 2 3540
GDD
Base 50		 0 0 13 72 270 514 676 606 342 103 13 0 2613
GDD
Base 55		 0 0 5 35 160 368 522 453 215 48 4 0 1813
GDD
Base 60		 0 0 1 16 84 234 369 302 118 17 0 0 1145
MGDD*
Base 50		 0 3 38 140 334 521 661 602 386 180 39 3 2909

*Modified Growing Degree Days: Base 50 Ceiling 86.

Growing Season Summary
Derived from 1971-2000 Averages

  Date of Last Spring Occurrence Date of First Fall Occurrence
Base
Temp
°F		 Median Early 90% 10% Late Median Early 90% 10% Late
32 5/02 4/08 4/21 5/19 5/27 10/04 9/22 9/22 10/16 10/22
30 4/27 4/08 4/14 5/10 5/13 10/08 9/22 9/26 10/24 11/09
28 4/20 3/27 4/05 5/01 5/07 10/16 9/22 9/30 11/02 11/10
24 4/08 3/23 3/26 4/16 4/18 11/01 10/02 10/19 11/13 11/19
20 3/31 3/16 3/18 4/13 4/18 11/10 10/18 10/26 11/28 12/08
16 3/21 2/21 3/05 4/08 4/13 11/20 10/24 11/02 12/06 12/21

Length of Growing Season (Days)
Derived from 1971-2000 Averages

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 153 125 135 175 179
30 163 137 149 186 214
28 182 138 154 204 216
24 206 176 191 226 231
20 220 200 207 245 267
16 235 213 218 273 280