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Climate Data for Jefferson 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 5. Last Spring Frost Zones.
- (The last frost occurs on or after May 14 in 10 percent of the years.)
- Median date of first frost in the fall: October 6. First Fall Frost Zones.
- (The first frost occurs on or before September 23 in 10 percent of the years.)
- Median growing season: 156 days. Range: 136 to 182 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°) |
26.6 |
32.0 |
43.7 |
59.0 |
71.7 |
80.4 |
84.5 |
82.1 |
74.3 |
62.2 |
46.2 |
31.4 |
| Ave Daily Low (F°) |
7.9 |
11.9 |
23.6 |
35.9 |
46.5 |
55.8 |
61.1 |
58.5 |
50.8 |
40.5 |
28.8 |
14.7 |
| Growing Degree Days |
0 |
2 |
37 |
161 |
359 |
535 |
675 |
610 |
413 |
202 |
40 |
3 |
| Heating Degree Days |
1479 |
1207 |
970 |
525 |
227 |
38 |
0 |
18 |
103 |
431 |
825 |
1302 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
44 |
131 |
246 |
182 |
31 |
10 |
0 |
0 |
| Ave Precipitation (") |
1.29 |
1.13 |
2.30 |
3.05 |
3.17 |
3.51 |
3.85 |
4.05 |
3.89 |
2.39 |
2.28 |
1.87 |
| Ave Snowfall (") |
9.6 |
7.0 |
6.4 |
1.4 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
2.3 |
10.7 |
Data from the weather station at Lake Mills, latitude 43°04' N, longitude 88°55' W, elevation 850 ft.
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