About Climate Summary Tables

Growing Season Summary for Station USW00014839 - MILWAUKEE MITCHELL AIRPORT, WI

Growing season summary by month
Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40		 5 10 71 205 518 814 1018 987 735 392 109 16 4880
GDD
Base 45		 1 3 34 111 368 664 863 832 585 256 51 5 3774
GDD
Base 50		 0 1 17 55 239 514 708 677 436 149 20 1 2818
GDD
Base 60		 0 0 3 10 73 238 399 368 175 31 2 0 1297
MGDD*
Base 50		 2 5 38 102 275 504 685 660 438 188 44 5 2946

*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 05/04 04/11 05/21 04/21 06/04 . 10/12 09/19 09/29 10/25 04/01
32 04/22 04/04 05/07 04/08 05/27 . 10/23 09/20 10/09 11/06 04/01
28 04/10 03/09 04/24 03/29 05/10 . 11/02 09/23 10/19 11/17 04/02
24 04/01 03/05 04/15 03/17 05/10 . 11/13 10/18 10/30 11/27 12/09
20 03/21 02/21 04/05 03/07 04/13 . 11/24 10/24 11/07 12/07 12/24
16 03/12 02/14 03/28 02/26 04/07 . 12/01 11/02 11/16 12/18 11/25

 

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
36 169 145 154 186 213
32 192 170 171 220 228
28 220 191 196 237 255
24 234 210 214 262 272
20 258 217 232 278 289
16 276 233 246 294 299