Historical Climate Data

Growing Season Summary
Station: 474961 MADISON WSO AIRPORT, 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 5 59 229 556 816 982 904 623 303 63 6 4552
GDD
Base 45		 0 1 28 131 405 666 827 749 474 184 28 2 3501
GDD
Base 50		 0 0 13 68 268 516 672 594 331 100 10 0 2576
GDD
Base 55		 0 0 4 33 157 369 517 440 207 44 2 0 1778
GDD
Base 60		 0 0 1 14 81 234 362 290 114 16 0 0 1116
MGDD*
Base 50		 0 3 42 152 348 526 654 593 384 184 36 3 2932

*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 5/10 4/21 4/26 5/28 6/11 10/02 9/17 9/22 10/13 10/17
30 5/03 4/09 4/17 5/19 5/26 10/06 9/22 9/24 10/15 10/17
28 4/28 3/26 4/07 5/10 5/16 10/09 9/22 9/24 10/28 11/09
24 4/13 3/24 4/03 5/05 5/12 10/26 10/02 10/08 11/11 11/16
20 4/06 3/16 3/21 4/20 5/01 11/05 10/14 10/19 11/23 12/08
16 3/23 3/06 3/13 4/10 4/18 11/14 10/20 10/31 12/01 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 147 112 125 162 169
30 155 133 139 173 190
28 163 138 145 201 209
24 193 159 166 217 226
20 213 177 197 246 267
16 232 194 213 261 280