Historical Climate Data

Growing Season Summary
Station: 478905 WASHINGTON ISLAND 1 N, 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 0 10 79 339 602 827 811 558 259 45 2 3510
GDD
Base 45		 0 0 1 25 201 452 673 656 409 138 14 0 2552
GDD
Base 50		 0 0 0 6 96 305 518 501 268 55 3 0 1738
GDD
Base 55		 0 0 0 0 34 174 364 347 146 13 0 0 1070
GDD
Base 60		 0 0 0 0 8 77 215 202 61 1 0 0 558
MGDD*
Base 50		 0 0 5 43 183 344 523 511 310 108 13 0 2026

*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 5/22 4/21 5/07 6/04 6/14 10/09 9/03 9/23 10/28 11/02
30 5/14 4/21 4/29 5/31 6/14 10/14 9/23 9/27 11/02 11/05
28 5/05 4/08 4/24 5/20 5/30 10/15 9/24 10/04 11/07 11/18
24 4/23 4/03 4/09 5/08 5/09 11/08 10/03 10/14 11/18 11/27
20 4/09 3/13 3/23 4/21 4/23 11/14 10/09 11/05 12/04 12/18
16 3/29 3/07 3/15 4/12 4/22 11/26 11/03 11/09 12/18 12/31

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 138 106 120 161 192
30 152 123 131 176 192
28 163 128 144 193 205
24 195 161 167 216 235
20 222 174 205 239 272
16 243 208 218 266 280