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Climate Data for Milwaukee 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 29. Last Spring Frost Zones.
- (The last frost occurs on or after May 15 in 10 percent of the years.)
- Median date of first frost in the fall: October 16. First Fall Frost Zones.
- (The first frost occurs on or before October 3 in 10 percent of the years.)
- Median growing season: 172 days. Range: 148 to 192 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°) |
26.1 |
30.1 |
40.4 |
52.9 |
64.3 |
74.9 |
79.9 |
77.8 |
70.6 |
58.7 |
44.7 |
31.2 |
| Ave Daily Low (F°) |
11.6 |
15.9 |
26.2 |
35.8 |
44.8 |
55.0 |
62.0 |
60.8 |
52.8 |
41.8 |
30.7 |
17.5 |
| Growing Degree Days |
1 |
2 |
29 |
104 |
256 |
465 |
639 |
596 |
388 |
170 |
35 |
4 |
| Heating Degree Days |
1429 |
1176 |
983 |
618 |
338 |
82 |
14 |
27 |
123 |
456 |
819 |
1259 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
16 |
82 |
197 |
160 |
24 |
0 |
0 |
0 |
| Ave Precipitation (") |
1.60 |
1.45 |
2.67 |
3.50 |
2.84 |
3.24 |
3.47 |
3.53 |
3.38 |
2.41 |
2.51 |
2.33 |
| Ave Snowfall (") |
13.0 |
11.2 |
8.9 |
2.5 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.4 |
2.8 |
11.4 |
Data from the weather station at Milwaukee WSO Airport, latitude 43°04' N, longitude 88°02' W, elevation 672 ft.
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