Historical Climate Data

Growing Season Summary
Station: 473269 GREEN BAY WSO AIRPORT, 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 2 33 177 506 766 937 868 584 266 46 3 4193
GDD
Base 45		 0 0 14 94 358 616 782 713 436 154 18 1 3190
GDD
Base 50		 0 0 5 46 227 466 627 558 295 76 5 0 2310
GDD
Base 55		 0 0 2 21 127 322 472 404 176 31 1 0 1558
GDD
Base 60		 0 0 0 8 62 195 319 254 89 9 0 0 939
MGDD*
Base 50		 0 0 21 111 303 480 617 561 345 145 24 1 2612

*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 5/06 4/17 4/23 5/17 5/26 10/03 9/20 9/21 10/15 10/27
30 5/03 4/07 4/17 5/14 5/16 10/07 9/20 9/23 10/20 11/06
28 4/26 4/06 4/10 5/07 5/09 10/13 9/21 9/25 11/03 11/10
24 4/10 3/24 3/29 4/21 4/25 11/02 10/07 10/16 11/12 11/16
20 4/05 3/13 3/18 4/11 4/18 11/09 10/20 10/26 11/19 11/26
16 3/24 2/27 3/12 4/06 4/09 11/20 10/31 11/07 12/05 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 152 128 134 169 182
30 160 133 141 177 198
28 172 137 153 197 212
24 202 174 187 221 233
20 222 194 207 235 241
16 242 217 219 265 280