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Climate Data for Rock 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: April 27. Last Spring Frost Zones.
- (The last frost occurs on or after May 10 in 10 percent of the years.)
- Median date of first frost in the fall: October 8. First Fall Frost Zones.
- (The first frost occurs on or before September 26 in 10 percent of the years.)
- Median growing season: 172 days. Range: 145 to 186 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°) |
26.3 |
30.6 |
43.3 |
58.3 |
70.0 |
80.2 |
83.7 |
80.9 |
73.2 |
62.4 |
46.0 |
31.5 |
| Ave Daily Low (F°) |
8.8 |
12.7 |
24.2 |
36.0 |
46.3 |
57.1 |
61.6 |
58.9 |
50.7 |
39.9 |
28.2 |
15.6 |
| Growing Degree Days |
1 |
3 |
42 |
173 |
364 |
554 |
684 |
599 |
420 |
218 |
45 |
5 |
| Heating Degree Days |
1469 |
1212 |
967 |
534 |
254 |
29 |
0 |
19 |
119 |
438 |
837 |
1283 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
43 |
140 |
243 |
171 |
29 |
10 |
0 |
0 |
| Ave Precipitation (") |
1.17 |
1.06 |
2.27 |
3.13 |
3.05 |
3.77 |
3.89 |
4.02 |
3.97 |
2.38 |
2.51 |
1.83 |
| Ave Snowfall (") |
6.8 |
6.3 |
5.5 |
0.9 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
1.1 |
7.0 |
Data from the weather station at Beloit, latitude 42°30' N, longitude 89°02' W, elevation 780 ft.
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