Historical Climate Data

Growing Season Summary
Station: 470273 ARBORETUM UNIV WIS, 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 55 221 540 787 955 892 614 300 67 5 4378
GDD
Base 45		 0 1 25 130 392 638 801 738 467 183 30 2 3363
GDD
Base 50		 0 0 10 70 258 491 648 584 327 97 12 0 2468
GDD
Base 55		 0 0 4 34 151 347 494 431 203 43 3 0 1694
GDD
Base 60		 0 0 1 15 76 216 343 283 108 15 0 0 1051
MGDD*
Base 50		 0 4 43 152 342 507 632 585 393 205 44 4 2871

*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 5/17 4/22 4/29 6/10 6/25 9/24 8/16 9/07 10/09 10/17
30 5/11 4/22 4/24 5/30 6/09 10/02 9/07 9/19 10/13 10/17
28 5/03 4/09 4/17 5/18 5/27 10/04 9/20 9/22 10/17 10/21
24 4/22 3/27 4/07 5/05 5/09 10/18 9/22 9/30 11/04 11/16
20 4/10 3/12 4/01 4/23 4/29 10/30 9/23 10/10 11/12 11/19
16 4/04 3/11 3/21 4/12 4/19 11/08 10/03 10/20 11/21 12/08

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 135 52 105 156 168
30 148 104 115 164 168
28 153 125 135 179 190
24 176 150 162 210 221
20 200 166 181 215 248
16 217 192 197 242 255