Historical Climate Data

Growing Season Summary
Station: 474953 MADELINE ISLAND, 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 8 77 308 570 794 778 511 205 25 0 3228
GDD
Base 45		 0 0 1 33 184 423 641 624 366 106 8 0 2352
GDD
Base 50		 0 0 0 13 95 283 488 470 232 45 2 0 1604
GDD
Base 55		 0 0 0 4 41 162 337 317 124 14 0 0 986
GDD
Base 60		 0 0 0 1 15 76 196 179 52 3 0 0 515
MGDD*
Base 50		 0 0 7 57 193 337 495 480 287 107 12 0 1946

*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 4/25 5/11 6/16 6/23 10/03 9/08 9/21 10/14 11/04
30 5/21 4/23 5/02 6/15 6/23 10/09 9/20 9/23 10/31 11/04
28 5/09 4/07 4/25 5/27 6/02 10/13 9/23 9/27 11/03 11/12
24 4/25 4/03 4/13 5/09 5/25 11/01 10/01 10/18 11/13 11/16
20 4/12 2/28 3/23 5/02 5/25 11/12 10/17 10/31 11/24 12/19
16 4/04 2/28 3/20 4/15 4/28 11/20 11/01 11/06 12/07 12/19

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 129 97 106 151 177
30 141 100 109 162 177
28 158 113 138 185 198
24 185 159 167 207 220
20 213 160 188 244 270
16 231 191 211 258 273