Historical Climate Data

Growing Season Summary
Station: 474829 LONG LAKE DAM, WI

Growing Degree Day Averages
Derived from 1971-1996 Data

Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40		 0 0 11 101 390 631 793 728 427 157 18 0 3254
GDD
Base 45		 0 0 3 51 259 482 638 573 289 79 5 0 2381
GDD
Base 50		 0 0 0 24 159 339 484 419 173 33 0 0 1636
GDD
Base 55		 0 0 0 10 86 212 332 273 90 11 0 0 1018
GDD
Base 60		 0 0 0 3 39 110 195 150 39 3 0 0 542
MGDD*
Base 50		 0 1 12 93 273 397 505 460 260 107 13 0 2119

*Modified Growing Degree Days: Base 50 Ceiling 86.

Growing Season Summary
Derived from 1971-1996 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 6/03 5/12 5/18 6/24 6/28 9/17 8/16 9/03 9/30 10/08
30 6/02 5/07 5/16 6/17 6/28 9/19 9/03 9/07 10/02 10/08
28 5/26 5/02 5/08 6/11 6/22 9/29 9/07 9/20 10/12 10/17
24 5/04 3/31 4/25 5/17 5/18 10/10 9/20 9/23 10/31 11/12
20 4/23 3/30 4/09 5/07 5/14 10/30 9/25 10/06 11/13 11/16
16 4/13 3/23 4/02 4/26 5/07 11/06 10/09 10/19 11/14 11/16

Length of Growing Season (Days)
Derived from 1971-1996 Averages

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 104 76 81 124 135
30 110 76 89 125 135
28 131 94 104 140 162
24 161 128 136 182 201
20 187 141 165 207 223
16 206 170 179 221 226