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Climate Data for Ozaukee 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 30. Last Spring Frost Zones.
- (The last frost occurs on or after May 13 in 10 percent of the years.)
- Median date of first frost in the fall: October 18. First Fall Frost Zones.
- (The first frost occurs on or before October 2 in 10 percent of the years.)
- Median growing season: 170 days. Range: 150 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°) |
27.1 |
31.0 |
40.0 |
50.7 |
61.9 |
72.1 |
78.1 |
77.1 |
69.8 |
58.6 |
45.3 |
32.3 |
| Ave Daily Low (F°) |
11.1 |
15.2 |
25.2 |
34.8 |
44.0 |
53.3 |
60.5 |
59.7 |
52.3 |
41.6 |
30.4 |
17.2 |
| Growing Degree Days |
1 |
1 |
18 |
64 |
200 |
384 |
585 |
564 |
360 |
152 |
29 |
3 |
| Heating Degree Days |
1423 |
1173 |
1004 |
666 |
377 |
124 |
22 |
32 |
132 |
462 |
813 |
1246 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
5 |
55 |
158 |
137 |
15 |
0 |
0 |
0 |
| Ave Precipitation (") |
1.25 |
1.03 |
1.97 |
2.96 |
2.68 |
3.07 |
3.35 |
3.79 |
3.75 |
2.38 |
2.16 |
1.95 |
| Ave Snowfall (") |
10.8 |
8.5 |
7.2 |
1.5 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.2 |
1.6 |
8.4 |
Data from the weather station at Port Washington, latitude 43°23' N, longitude 87°52' W, elevation 600 ft.
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