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Climate Data for Polk 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 11. Last Spring Frost Zones.
- (The last frost occurs on or after May 25 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 23 in 10 percent of the years.)
- Median growing season: 143 days. Range: 125 to 160 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°) |
21.0 |
27.5 |
40.1 |
56.9 |
69.9 |
78.5 |
83.4 |
80.3 |
70.4 |
58.8 |
41.0 |
25.5 |
| Ave Daily Low (F°) |
-1.7 |
3.7 |
18.6 |
33.1 |
44.9 |
54.3 |
59.7 |
57.4 |
48.0 |
36.9 |
23.2 |
6.6 |
| Growing Degree Days |
0 |
1 |
22 |
137 |
336 |
502 |
648 |
579 |
346 |
161 |
23 |
1 |
| Heating Degree Days |
1714 |
1383 |
1104 |
600 |
274 |
67 |
20 |
31 |
189 |
530 |
987 |
1516 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
38 |
109 |
225 |
152 |
15 |
0 |
0 |
0 |
| Ave Precipitation (") |
0.91 |
0.72 |
1.67 |
2.68 |
3.41 |
4.46 |
3.57 |
4.55 |
3.65 |
2.54 |
1.44 |
1.03 |
| Ave Snowfall (") |
11.2 |
6.4 |
8.8 |
1.3 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
4.9 |
9.4 |
Data from the weather station at St Croix Falls, latitude 45°25' N, longitude 92°39' W, elevation 770 ft.
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