Historical Climate Data

Growing Season Summary
Station: 476764 PORT WASHINGTON, 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		 1 3 36 142 416 704 919 898 645 323 73 7 4117
GDD
Base 45		 0 0 16 65 272 554 765 743 496 193 30 2 3095
GDD
Base 50		 0 0 6 26 153 405 610 588 350 95 10 0 2212
GDD
Base 55		 0 0 1 10 74 265 455 433 215 36 2 0 1472
GDD
Base 60		 0 0 0 3 30 150 302 280 110 9 0 0 874
MGDD*
Base 50		 0 1 22 66 205 412 597 582 371 151 30 3 2408

*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 4/28 4/06 4/11 5/10 5/16 10/18 9/22 9/27 11/04 11/19
30 4/20 3/26 4/08 5/05 5/16 10/24 9/22 10/07 11/09 11/19
28 4/13 3/25 3/30 4/27 5/09 10/29 9/22 10/10 11/13 11/20
24 4/07 3/16 3/21 4/18 4/22 11/09 10/13 10/22 11/22 11/27
20 3/23 3/06 3/14 4/10 4/13 11/20 10/30 11/04 12/08 12/21
16 3/16 2/17 2/25 3/29 4/08 11/24 10/30 11/09 12/19 1/02

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 173 138 151 200 223
30 187 161 164 211 223
28 196 163 174 222 226
24 217 188 201 239 247
20 238 208 215 265 280
16 258 219 227 283 296