Historical Climate Data

Growing Season Summary
Station: 473058 GERMANTOWN 2 W, 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 4 45 181 479 742 916 860 601 284 67 6 4191
GDD
Base 45		 0 0 21 101 335 593 762 706 454 170 30 2 3177
GDD
Base 50		 0 0 8 53 212 445 608 552 313 91 11 0 2297
GDD
Base 55		 0 0 3 26 119 304 454 399 193 39 3 0 1544
GDD
Base 60		 0 0 0 11 60 183 304 254 104 13 0 0 934
MGDD*
Base 50		 0 2 29 112 289 467 602 557 367 168 37 3 2638

*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 5/17 4/25 4/29 5/30 6/12 9/30 9/05 9/19 10/11 10/17
30 5/10 4/21 4/25 5/27 6/04 10/04 9/05 9/23 10/18 11/03
28 5/04 4/02 4/17 5/16 6/04 10/10 9/05 9/23 10/22 11/04
24 4/14 3/26 4/05 5/04 5/11 10/30 9/30 10/11 11/12 11/20
20 4/08 3/16 3/20 4/20 4/29 11/04 10/10 10/17 11/20 11/29
16 3/24 3/02 3/05 4/09 4/18 11/19 10/18 10/27 12/05 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 138 110 119 156 160
30 145 119 126 172 182
28 160 125 135 182 191
24 193 149 173 216 225
20 208 186 191 243 248
16 239 199 214 262 280