Historical Climate Data

Growing Season Summary
Station: 473453 HARTFORD SEWAGE PLANT, 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 6 53 203 522 777 941 872 604 295 65 6 4346
GDD
Base 45		 0 1 25 115 374 627 786 717 456 179 29 2 3315
GDD
Base 50		 0 0 11 59 243 478 631 563 316 95 11 0 2410
GDD
Base 55		 0 0 4 27 141 334 476 409 194 42 2 0 1633
GDD
Base 60		 0 0 1 11 71 206 323 263 102 14 0 0 994
MGDD*
Base 50		 0 3 34 132 322 496 619 568 374 178 35 3 2769

*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 5/30 6/10 10/02 9/12 9/18 10/13 10/22
30 5/09 4/07 4/20 5/26 5/28 10/05 9/14 9/23 10/15 10/22
28 4/28 4/06 4/12 5/13 5/28 10/06 9/22 9/23 10/20 11/01
24 4/12 3/16 4/02 4/29 5/02 10/22 9/23 10/02 11/11 11/15
20 4/06 3/16 3/20 4/17 5/01 11/05 10/13 10/20 11/18 11/26
16 3/23 2/21 3/11 4/09 4/13 11/21 10/19 11/06 12/03 12/21

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 143 109 120 160 177
30 151 121 131 172 188
28 162 137 140 181 199
24 195 149 171 215 234
20 212 184 195 238 250
16 239 208 216 263 280