Historical Climate Data

Growing Season Summary
Station: 473244 GRANTSBURG, 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 0 21 180 515 736 905 836 518 216 28 0 3798
GDD
Base 45		 0 0 6 99 370 587 750 681 373 119 11 0 2878
GDD
Base 50		 0 0 2 49 241 438 595 526 241 56 3 0 2068
GDD
Base 55		 0 0 0 21 137 295 440 373 135 21 0 0 1369
GDD
Base 60		 0 0 0 7 68 169 289 229 64 6 0 0 802
MGDD*
Base 50		 0 0 16 130 322 459 589 534 307 132 18 0 2412

*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 5/09 4/11 4/30 5/18 6/05 9/26 9/03 9/20 10/09 10/16
30 5/03 4/11 4/21 5/17 5/26 10/01 9/19 9/21 10/15 10/26
28 4/27 4/08 4/13 5/10 5/20 10/08 9/22 9/26 10/20 10/26
24 4/15 3/25 3/29 5/02 5/06 10/26 10/01 10/02 11/06 12/01
20 4/09 3/24 3/25 4/17 4/21 11/03 10/02 10/19 11/16 12/01
16 4/02 3/07 3/20 4/10 4/16 11/12 10/17 10/30 11/28 1/01

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

Base
Temp
°F		 Median Shortest 10% 90% Longest
32 142 111 127 157 174
30 153 126 130 171 178
28 165 127 141 180 187
24 189 150 168 217 233
20 210 176 189 228 235
16 222 191 210 255 269