Historical Climate Data

Growing Season Summary
Station: 476646 PLATTEVILLE, 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 71 261 594 851 1008 946 664 341 70 7 4789
GDD
Base 45		 0 1 36 158 441 701 853 791 515 216 32 2 3721
GDD
Base 50		 0 0 16 84 300 551 698 636 371 123 12 0 2773
GDD
Base 55		 0 0 6 40 180 403 544 481 242 59 3 0 1944
GDD
Base 60		 0 0 1 18 94 263 390 328 140 23 0 0 1247
MGDD*
Base 50		 0 4 45 167 365 555 680 629 414 201 37 3 3081

*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 5/05 4/04 4/20 5/27 5/30 10/05 9/12 9/21 10/13 10/17
30 4/26 3/28 4/10 5/09 5/16 10/07 9/19 9/25 10/16 10/30
28 4/19 3/26 4/03 5/04 5/09 10/11 9/22 9/29 11/04 11/03
24 4/10 3/23 3/26 4/18 4/20 10/30 10/02 10/10 11/09 11/13
20 4/05 3/17 3/22 4/12 4/17 11/04 10/02 10/20 11/17 11/21
16 3/21 2/21 3/04 4/07 4/13 11/13 10/20 11/03 11/29 12/08

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 151 110 133 173 181
30 162 139 142 181 199
28 181 139 154 196 221
24 200 174 179 222 225
20 215 190 194 231 249
16 238 194 218 264 274