Historical Climate Data

Growing Season Summary
Station: 472869 FORT ATKINSON 2 SSE, 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 64 247 568 830 995 914 639 325 74 8 4617
GDD
Base 45		 0 1 32 147 417 681 840 759 492 204 35 2 3569
GDD
Base 50		 0 0 14 78 279 533 685 605 349 114 14 1 2643
GDD
Base 55		 0 0 5 38 167 388 531 451 223 54 4 0 1840
GDD
Base 60		 0 0 1 17 88 253 377 301 124 21 0 0 1170
MGDD*
Base 50		 0 4 41 152 344 536 664 600 397 197 42 4 2948

*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 4/11 4/25 5/25 5/29 10/03 9/16 9/21 10/16 10/22
30 4/29 4/08 4/10 5/16 5/21 10/07 9/21 9/22 10/29 11/03
28 4/18 3/27 4/04 5/15 5/21 10/15 9/22 9/26 11/05 11/11
24 4/08 3/24 3/26 4/19 4/21 11/01 10/02 10/10 11/14 11/19
20 3/26 2/21 3/15 4/12 4/19 11/07 10/13 10/19 11/23 12/14
16 3/22 2/18 3/03 4/08 4/18 11/21 10/30 11/03 12/06 12/22

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 151 110 134 170 177
30 163 135 137 184 204
28 178 137 151 205 216
24 206 168 186 222 226
20 217 188 198 254 272
16 246 200 218 270 281