Historical Climate Data

Growing Season Summary
Station: 477997 SPARTA, 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 48 219 552 811 968 903 601 283 50 3 4238
GDD
Base 45		 0 1 22 129 403 661 813 748 455 173 21 1 3274
GDD
Base 50		 0 0 9 69 268 511 658 593 316 93 7 0 2417
GDD
Base 55		 0 0 3 34 158 365 503 439 197 42 2 0 1673
GDD
Base 60		 0 0 1 15 81 232 350 290 109 15 0 0 1052
MGDD*
Base 50		 0 3 34 151 346 523 642 592 378 181 31 2 2748

*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 5/11 3/30 4/28 5/27 6/01 9/27 8/12 9/07 10/10 10/15
30 5/05 3/29 4/22 5/17 5/27 10/03 9/19 9/23 10/14 10/17
28 4/30 3/29 4/05 5/14 5/27 10/06 9/19 9/23 10/14 10/30
24 4/15 3/24 4/01 5/03 5/07 10/22 9/27 10/03 11/05 11/11
20 4/06 3/17 3/22 4/13 4/22 11/03 10/02 10/09 11/13 11/20
16 4/03 3/13 3/18 4/11 4/19 11/12 10/11 10/20 11/30 12/20

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 136 106 114 157 186
30 151 131 133 167 189
28 161 138 139 182 192
24 187 157 170 211 212
20 211 179 193 235 243
16 218 191 200 252 274