Historical Climate Data

Growing Season Summary
Station: 479046 WEST ALLIS, 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		 2 11 67 247 585 846 1058 986 724 396 109 11 5041
GDD
Base 45		 0 3 33 146 434 696 903 831 575 258 54 4 3939
GDD
Base 50		 0 0 14 78 294 547 748 676 427 146 23 0 2957
GDD
Base 55		 0 0 5 39 179 399 593 521 287 69 7 0 2104
GDD
Base 60		 0 0 1 19 99 263 439 367 170 27 1 0 1388
MGDD*
Base 50		 1 5 35 131 330 541 722 665 437 196 47 4 3116

*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 4/20 4/02 4/06 4/29 5/01 10/24 10/02 10/09 11/10 11/19
30 4/10 3/27 4/02 4/27 5/01 11/02 10/08 10/14 11/14 11/19
28 4/10 3/19 3/26 4/21 5/01 11/05 10/09 10/20 11/14 11/19
24 4/03 3/14 3/18 4/11 4/17 11/12 10/20 10/27 11/26 11/29
20 3/21 2/22 2/25 4/07 4/09 11/22 11/06 11/08 12/07 12/16
16 3/13 2/09 2/15 4/01 4/06 12/01 11/09 11/14 12/16 12/25

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 187 167 171 211 223
30 197 174 180 215 224
28 213 178 192 222 224
24 221 194 208 248 258
20 249 218 219 272 278
16 265 235 237 289 305