Historical Climate Data

Growing Season Summary
Station: 478937 WAUKESHA WATER WORKS, 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 9 65 232 574 837 1019 956 681 357 82 11 4813
GDD
Base 45		 0 2 32 136 423 688 864 801 532 227 38 4 3740
GDD
Base 50		 0 0 14 72 283 538 710 646 386 126 15 1 2787
GDD
Base 55		 0 0 5 34 170 392 555 491 253 60 4 0 1959
GDD
Base 60		 0 0 1 15 89 258 401 338 146 23 0 0 1265
MGDD*
Base 50		 0 4 39 136 338 537 687 636 414 193 38 4 3021

*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 4/27 4/07 4/10 5/10 5/16 10/14 9/22 9/26 11/02 11/19
30 4/22 3/27 4/09 5/03 5/16 10/18 9/23 10/01 11/09 11/19
28 4/13 3/24 3/28 4/29 5/01 10/25 10/02 10/08 11/14 11/20
24 4/09 3/16 3/24 4/17 4/22 11/04 10/13 10/20 11/16 11/22
20 3/22 3/02 3/13 4/09 4/18 11/15 10/20 11/04 11/30 12/21
16 3/19 2/17 3/06 4/06 4/11 11/25 11/06 11/09 12/11 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 170 138 146 191 226
30 176 152 162 206 226
28 197 164 175 215 226
24 212 187 193 229 236
20 234 201 213 260 281
16 253 218 221 279 283