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Climate Data for Green County, Wisconsin
Climate Normals and Growing Season Summary
Chart courtesy of the Midwestern Regional Climate Center.
Growing Season Summary:
- Median date of last frost in the spring: May 9. Last Spring Frost Zones.
- (The last frost occurs on or after May 27 in 10 percent of the years.)
- Median date of first frost in the fall: September 29. First Fall Frost Zones.
- (The first frost occurs on or before September 14 in 10 percent of the years.)
- Median growing season: 146 days. Range: 122 to 156 days.
- For perennials, landscape plantings and fruit trees, see our Map of USDA Plant Hardiness Zones for Wisconsin.
| Climate Normals |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sept |
Oct |
Nov |
Dec |
| Ave Daily High (F°) |
25.5 |
30.2 |
42.7 |
57.6 |
69.8 |
79.7 |
83.7 |
81.0 |
73.2 |
61.6 |
45.8 |
30.9 |
| Ave Daily Low (F°) |
5.4 |
9.9 |
22.9 |
34.9 |
45.4 |
54.6 |
59.4 |
56.5 |
47.9 |
36.7 |
25.7 |
12.1 |
| Growing Degree Days |
1 |
3 |
38 |
154 |
333 |
516 |
638 |
584 |
393 |
200 |
44 |
5 |
| Heating Degree Days |
1535 |
1257 |
998 |
561 |
266 |
45 |
8 |
31 |
153 |
499 |
873 |
1345 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
37 |
111 |
213 |
149 |
21 |
9 |
0 |
0 |
| Ave Precipitation (") |
1.15 |
1.16 |
2.33 |
3.30 |
3.29 |
4.02 |
3.88 |
4.06 |
3.86 |
2.69 |
2.15 |
1.83 |
| Ave Snowfall (") |
7.5 |
5.5 |
6.7 |
1.6 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
1.3 |
8.6 |
Data from the weather station at Brodhead, latitude 42°37' N, longitude 89°23' W, elevation 790 ft.
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