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 7 69 237 573 852 999 933 671 325 78 9 4753
GDD
Base 45		 0 2 35 135 421 702 844 778 521 204 35 3 3680
GDD
Base 50		 0 0 17 67 282 552 689 623 376 114 13 1 2734
GDD
Base 60		 0 0 3 11 88 263 379 315 139 22 1 0 1222
MGDD*
Base 50		 1 4 42 140 336 545 667 610 406 178 40 4 2972

*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