Historical Climate Data

Growing Season Summary
Station: 471139 BRULE ISLAND, WI

Growing Degree Day Averages
Derived from 1971-1989 Data

Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40		 0 0 5 103 413 627 820 740 436 156 18 0 3255
GDD
Base 45		 0 0 1 51 277 480 667 586 294 78 5 0 2393
GDD
Base 50		 0 0 0 24 168 336 513 432 172 31 0 0 1648
GDD
Base 55		 0 0 0 10 91 206 361 283 84 9 0 0 1028
GDD
Base 60		 0 0 0 3 41 105 219 154 34 2 0 0 550
MGDD*
Base 50		 0 0 6 88 281 395 526 465 256 94 11 0 2083

*Modified Growing Degree Days: Base 50 Ceiling 86.

Growing Season Summary
Derived from 1971-1989 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 5/28 5/13 5/15 6/16 7/05 9/18 8/28 9/03 10/01 10/04
30 5/26 5/07 5/12 6/10 6/17 9/24 9/03 9/10 10/08 10/17
28 5/11 5/01 5/02 5/24 5/27 9/30 9/07 9/16 10/15 10/31
24 5/03 4/01 4/15 5/14 5/18 10/13 9/23 9/28 11/01 11/04
20 4/14 3/24 4/03 4/25 5/07 11/02 10/10 10/12 11/12 11/13
16 4/10 3/22 3/25 4/20 4/26 11/08 10/14 10/19 11/16 11/21

Length of Growing Season (Days)
Derived from 1971-1989 Averages

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 110 74 89 129 133
30 121 97 103 137 144
28 137 126 127 155 162
24 166 135 138 186 192
20 200 159 174 216 223
16 211 176 193 231 235