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Climate Data for Waukesha County, Wisconsin

Climate Normals and Growing Season Summary

Temperature norms and extremes for Waukesha County, Wisconsin
Chart courtesy of the Midwestern Regional Climate Center.

Growing Season Summary:

Median date of last frost in the spring: May 6. Last Spring Frost Zones.
(The last frost occurs on or after May 17 in 10 percent of the years.)

Median date of first frost in the fall: October 6. First Fall Frost Zones.
(The first frost occurs on or before September 23 in 10 percent of the years.)

Median growing season: 158 days. Range: 136 to 173 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°) 26.4 31.1 42.3 56.2 68.7 78.5 82.8 80.2 72.3 60.4 45.5 31.3
Ave Daily Low (F°) 10.8 15.0 25.5 36.3 46.6 56.2 61.8 59.9 52.0 41.2 30.2 16.8
Growing Degree Days 1 2 34 143 331 518 667 600 390 181 38 4
Heating Degree Days 1438 1173 964 564 265 47 6 18 110 448 816 1268
Cooling Degree Days 0 0 0 0 39 119 232 176 26 8 0 0
Ave Precipitation (") 1.34 1.09 2.36 3.35 2.99 3.47 3.33 4.10 3.68 2.48 2.40 1.96
Ave Snowfall (") 10.3 7.2 8.5 2.1 0.0 0.0 0.0 0.0 0.0 0.0 2.3 10.0


Data from the weather station at Waukesha, latitude 43°01' N, longitude 88°14' W, elevation 860 ft. Growing season data (including growing degree days and frost dates) are not available from the Waukesha station, and have been taken from Oconomowoc 1 SW.

Climate Notes

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