Historical Climate Data

Growing Season Summary
Station: 470773 BIG FALLS HYDRO, WI

Growing Degree Day Averages
Derived from 1983-2000 Data

Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
GDD
Base 40		 0 0 19 144 442 638 764 732 468 158 12 0 3185
GDD
Base 45		 0 0 6 74 305 497 619 586 327 78 3 0 2354
GDD
Base 50		 0 0 1 34 187 359 474 439 205 34 0 0 1635
GDD
Base 55		 0 0 0 16 99 231 330 295 110 13 0 0 1029
GDD
Base 60		 0 0 0 6 43 123 194 166 49 2 0 0 548
MGDD*
Base 50		 0 0 22 127 306 408 488 466 305 125 9 0 2134

*Modified Growing Degree Days: Base 50 Ceiling 86.

Growing Season Summary
Derived from 1983-2000 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 6/02 5/03 5/20 6/17 6/23 9/12 9/02 9/05 9/28 10/02
30 5/28 5/01 5/02 6/08 6/22 9/23 9/08 9/09 10/05 10/13
28 5/15 4/29 5/02 6/08 6/21 9/25 9/09 9/13 10/10 10/21
24 4/26 3/25 4/05 5/09 5/16 10/06 9/21 9/30 10/30 10/31
20 4/14 3/24 3/31 4/28 5/04 10/22 10/02 10/03 11/03 11/04
16 4/09 3/22 3/25 4/23 5/04 11/03 10/11 10/13 11/11 11/16

Length of Growing Season (Days)
Derived from 1983-2000 Averages

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 102 81 89 126 140
30 128 81 94 144 144
28 137 94 98 152 155
24 164 137 144 189 211
20 194 152 157 211 211
16 208 160 186 223 225