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Climate Data for Iron 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: June 3. Last Spring Frost Zones.
- (The last frost occurs on or after June 15 in 10 percent of the years.)
- Median date of first frost in the fall: September 23. First Fall Frost Zones.
- (The first frost occurs on or before September 5 in 10 percent of the years.)
- Median growing season: 112 days. Range: 90 to 133 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°) |
21.9 |
27.2 |
38.6 |
52.4 |
65.2 |
73.8 |
79.0 |
76.0 |
66.9 |
56.5 |
40.2 |
25.9 |
| Ave Daily Low (F°) |
1.7 |
4.5 |
16.7 |
29.6 |
39.9 |
48.8 |
55.1 |
53.4 |
45.7 |
36.5 |
24.3 |
8.7 |
| Growing Degree Days |
0 |
2 |
17 |
93 |
258 |
398 |
521 |
478 |
287 |
143 |
21 |
1 |
| Heating Degree Days |
1649 |
1375 |
1156 |
720 |
400 |
147 |
52 |
87 |
265 |
574 |
981 |
1479 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
15 |
36 |
117 |
78 |
0 |
0 |
0 |
0 |
| Ave Precipitation (") |
1.77 |
1.24 |
1.97 |
2.14 |
3.28 |
3.91 |
3.90 |
4.29 |
4.29 |
3.37 |
2.52 |
1.95 |
| Ave Snowfall (") |
32.5 |
22.3 |
22.1 |
8.0 |
0.9 |
0.0 |
0.0 |
0.0 |
0.0 |
2.1 |
19.4 |
31.8 |
Data from the weather station at Gurney, latitude 46°28' N, longitude 90°30' W, elevation 981 ft.
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