Historical Climate Data

Growing Season Summary
Station: 470696 BELOIT COLLEGE, 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		 2 8 69 272 601 863 1009 930 694 368 86 10 4891
GDD
Base 45		 0 2 34 166 452 716 857 781 547 239 39 4 3824
GDD
Base 50		 0 0 15 89 312 568 706 632 403 138 15 1 2872
GDD
Base 55		 0 0 6 44 193 422 554 482 269 69 5 0 2040
GDD
Base 60		 0 0 1 19 106 283 403 335 159 28 1 0 1334
MGDD*
Base 50		 1 4 44 164 363 563 683 618 430 211 44 4 3118

*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 4/22 3/28 4/06 5/08 5/12 10/08 9/22 9/25 10/25 11/03
30 4/18 3/28 4/05 5/07 5/11 10/18 9/23 10/03 11/10 12/16
28 4/10 3/25 4/02 4/30 5/11 10/24 10/02 10/09 11/14 12/16
24 4/06 3/17 3/23 4/14 4/18 11/06 10/17 10/25 11/23 12/16
20 3/26 2/21 3/09 4/10 4/11 11/20 10/30 11/04 12/04 12/16
16 3/18 2/10 2/20 4/05 4/09 11/27 11/03 11/11 12/15 12/22

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 175 138 145 195 204
30 183 147 154 211 250
28 197 147 176 224 254
24 216 187 201 240 257
20 240 207 216 263 269
16 256 219 224 284 293