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Climate Data for Ozaukee County, Wisconsin

Climate Normals and Growing Season Summary

Temperature norms and extremes for Ozaukee County
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.

Climate Notes

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