Historical Climate Data

Growing Season Summary
Station: 477226 RIVER FALLS, 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 40 231 576 823 981 915 615 297 44 1 4530
GDD
Base 45		 0 0 16 136 425 673 827 760 467 181 18 0 3508
GDD
Base 50		 0 0 6 71 286 523 672 605 327 96 6 0 2596
GDD
Base 55		 0 0 1 33 170 377 518 450 204 42 1 0 1801
GDD
Base 60		 0 0 0 13 89 241 365 299 111 14 0 0 1136
MGDD*
Base 50		 0 1 26 154 359 533 656 603 376 172 23 1 2908

*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 5/08 4/11 4/25 5/20 5/22 10/01 9/03 9/20 10/10 10/14
30 5/02 4/06 4/16 5/18 5/22 10/03 9/19 9/22 10/18 10/26
28 4/24 4/05 4/10 5/06 5/17 10/10 9/22 9/27 10/28 11/03
24 4/13 3/25 4/03 4/27 5/06 10/29 9/22 10/08 11/07 11/11
20 4/06 3/16 3/24 4/16 4/20 11/02 10/02 10/15 11/13 11/23
16 3/28 2/26 3/13 4/10 4/17 11/11 10/20 10/29 11/28 11/29

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 147 120 126 160 174
30 157 127 135 177 191
28 169 139 151 190 194
24 196 139 176 212 224
20 212 177 190 228 234
16 228 194 209 253 260