About Climate Summary Tables

Growing Season Summary for Station USW00014837 - MADISON DANE COUNTY REGIONAL AP, WI

Growing season summary by month
Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40		 1 6 63 230 560 840 987 921 659 318 77 8 4670
GDD
Base 45		 0 2 31 130 409 690 832 766 510 199 35 3 3606
GDD
Base 50		 0 0 15 65 272 540 677 611 366 109 13 1 2668
GDD
Base 60		 0 0 3 10 83 254 368 304 133 20 1 0 1174
MGDD*
Base 50		 0 4 40 138 331 541 664 607 403 176 40 3 5860

*Modified Growing Degree Days: Base 50 Ceiling 86.

Growing Season Summary - Derived from 1991-2020 Averages
  DATE OF LAST SPRING OCCURRENCE   DATE OF FIRST FALL OCCURRENCE
Base
Temp °F		 Median Early 90% 10% Late . Median Early 90% 10% Late
36 05/17 04/19 06/01 04/29 07/06 . 09/26 08/27 09/14 10/07 10/25
32 05/02 04/07 05/20 04/18 06/10 . 10/05 09/12 09/23 10/18 11/03
28 04/22 03/27 05/08 04/06 05/23 . 10/17 09/20 10/02 11/01 11/16
24 04/10 03/08 04/26 03/28 05/12 . 10/29 10/02 10/12 11/14 11/29
20 04/01 02/25 04/16 03/17 05/09 . 11/09 10/09 10/25 11/25 12/09
16 03/23 02/25 04/08 03/08 04/19 . 11/21 10/19 11/03 12/04 12/14

 

Length of Growing Season (Days) - Derived from 1991-2020 Normals
*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding
Base
Temp °F		 Median Shortest 10% 90% Longest
36 141 118 124 161 171
32 162 125 145 179 199
28 184 151 163 210 215
24 212 175 194 233 247
20 231 199 211 257 266
16 254 212 219 278 287