Historical Climate Data

Growing Season Summary
Station: 476678 PLYMOUTH, 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 4 47 195 512 780 961 906 634 308 65 6 4422
GDD
Base 45		 0 0 22 109 363 630 806 751 486 188 28 2 3394
GDD
Base 50		 0 0 9 55 234 481 651 596 342 98 10 0 2488
GDD
Base 55		 0 0 3 26 134 337 496 441 214 42 3 0 1710
GDD
Base 60		 0 0 0 10 69 209 343 290 116 13 0 0 1066
MGDD*
Base 50		 0 2 29 119 306 494 639 594 380 164 30 3 2769

*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 5/10 4/10 4/24 5/24 5/27 10/07 9/20 9/23 10/16 10/22
30 5/03 4/10 4/20 5/18 5/27 10/11 9/22 9/24 11/01 11/11
28 4/25 3/28 4/09 5/12 5/16 10/17 9/22 9/27 11/07 11/15
24 4/12 3/24 3/29 4/26 5/07 11/03 10/11 10/16 11/16 11/20
20 4/06 3/16 3/20 4/13 4/18 11/12 10/19 10/27 11/26 12/18
16 3/23 3/01 3/09 4/09 4/11 11/21 10/31 11/06 12/10 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 151 125 132 170 177
30 159 128 138 184 193
28 174 135 153 208 213
24 204 175 186 223 234
20 219 189 206 239 276
16 240 209 218 274 279