Historical Climate Data

Growing Season Summary
Station: 479236 WILLOW RESERVOIR, 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		 0 0 12 105 401 645 803 733 446 169 19 1 3265
GDD
Base 45		 0 0 3 51 267 495 648 578 305 87 6 0 2390
GDD
Base 50		 0 0 0 23 159 349 493 424 185 37 1 0 1637
GDD
Base 55		 0 0 0 10 82 218 339 275 97 12 0 0 1013
GDD
Base 60		 0 0 0 3 35 112 197 147 44 3 0 0 531
MGDD*
Base 50		 0 0 10 84 259 393 506 455 264 102 13 0 2046

*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 5/27 4/28 5/10 6/11 6/17 9/22 8/23 9/04 10/06 10/14
30 5/21 4/25 5/04 6/04 6/11 9/25 9/03 9/07 10/14 10/22
28 5/12 4/06 4/24 6/03 6/06 10/04 9/11 9/21 10/22 11/01
24 5/01 3/19 4/15 5/18 5/28 10/17 9/23 9/28 11/06 11/16
20 4/14 3/18 3/30 4/29 5/07 11/02 9/25 10/04 11/16 11/22
16 4/09 3/18 3/26 4/22 5/06 11/11 10/20 10/27 11/26 11/29

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 113 73 97 141 157
30 130 97 103 151 177
28 147 97 121 176 199
24 167 125 137 197 218
20 198 163 170 223 239
16 215 189 196 241 250