Historical Climate Data

Growing Season Summary
Station: 475017 MANITOWOC, 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 1 26 154 459 723 919 871 623 295 58 5 4030
GDD
Base 45		 0 0 9 72 313 574 766 719 476 172 22 1 3044
GDD
Base 50		 0 0 2 27 185 426 612 567 334 81 7 0 2184
GDD
Base 55		 0 0 0 8 94 283 459 415 204 28 1 0 1455
GDD
Base 60		 0 0 0 2 40 161 306 267 103 6 0 0 863
MGDD*
Base 50		 0 0 14 82 252 439 603 566 363 138 22 2 2417

*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 5/04 3/31 4/09 5/16 7/07 10/09 9/22 9/25 10/25 11/01
30 4/27 3/28 4/05 5/16 7/07 10/19 9/22 10/05 11/03 11/11
28 4/17 3/24 3/30 5/05 7/07 10/26 10/02 10/10 11/12 11/17
24 4/09 3/16 3/24 4/13 4/17 11/06 10/20 10/24 11/18 11/22
20 3/31 3/12 3/17 4/10 4/11 11/13 10/20 11/03 11/29 12/21
16 3/20 2/16 3/03 4/08 4/11 11/22 11/03 11/09 12/10 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 161 117 137 183 189
30 180 117 151 200 212
28 189 117 169 213 226
24 217 190 198 230 242
20 230 194 215 256 280
16 251 209 220 279 284