Historical Climate Data

Growing Season Summary
Station: 474482 LAKE MILLS, 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 4 61 262 607 855 1021 930 677 347 73 7 4790
GDD
Base 45		 0 0 30 157 454 707 867 778 528 221 33 2 3739
GDD
Base 50		 0 0 13 84 311 559 714 625 382 125 12 0 2798
GDD
Base 55		 0 0 4 40 189 412 561 472 249 57 3 0 1972
GDD
Base 60		 0 0 0 18 99 272 407 321 141 20 0 0 1273
MGDD*
Base 50		 0 3 41 167 378 559 688 614 420 203 37 3 3082

*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 5/03 4/08 4/15 5/10 5/25 10/06 9/22 9/23 10/25 11/03
30 4/23 3/29 4/08 5/09 5/10 10/11 9/22 9/30 11/03 11/10
28 4/18 3/29 4/04 5/07 5/09 10/19 9/22 10/06 11/04 11/10
24 4/09 3/15 3/28 4/24 5/01 11/02 10/03 10/15 11/15 11/22
20 3/28 3/15 3/18 4/10 4/19 11/12 10/18 10/24 11/28 12/21
16 3/19 2/27 3/07 4/07 4/09 11/22 10/30 11/07 12/08 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 160 132 136 179 182
30 174 135 151 192 219
28 183 138 160 211 219
24 201 176 187 221 242
20 222 194 203 249 281
16 249 218 222 280 284