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Climate Data for Iowa 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 8. Last Spring Frost Zones.
- (The last frost occurs on or after April 26 in 10 percent of the years.)
- Median date of first frost in the fall: October 4. First Fall Frost Zones.
- (The first frost occurs on or before September 23 in 10 percent of the years.)
- Median growing season: 153 days. Range: 133 to 159 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°) |
23.9 |
28.9 |
41.3 |
56.6 |
67.9 |
77.6 |
81.9 |
79.4 |
70.8 |
59.4 |
43.4 |
28.9 |
| Ave Daily Low (F°) |
5.9 |
9.9 |
22.9 |
35.1 |
45.9 |
55.2 |
60.2 |
58.0 |
49.4 |
38.7 |
26.0 |
12.3 |
| Growing Degree Days |
1 |
1 |
36 |
150 |
334 |
514 |
646 |
580 |
375 |
176 |
34 |
2 |
| Heating Degree Days |
1553 |
1277 |
1020 |
576 |
274 |
53 |
8 |
32 |
159 |
498 |
909 |
1376 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
26 |
95 |
197 |
146 |
12 |
5 |
0 |
0 |
| Ave Precipitation (") |
1.18 |
1.17 |
2.57 |
3.15 |
3.41 |
3.78 |
4.06 |
4.40 |
3.71 |
2.36 |
2.22 |
1.75 |
| Ave Snowfall (") |
8.0 |
7.2 |
7.5 |
1.9 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.2 |
3.8 |
10.5 |
Data from the weather station at Dodgeville, latitude 42°58' N, longitude 90°07' W, elevation 1110 ft.
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