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Climate Data for Winnebago County, Wisconsin

Climate Normals and Growing Season Summary

Temperature norms and extremes for Winnebago County
Chart courtesy of the Midwestern Regional Climate Center.

Growing Season Summary:

Median date of last frost in the spring: May 9. Last Spring Frost Zones.
(The last frost occurs on or after May 23 in 10 percent of the years.)

Median date of first frost in the fall: October 4. First Fall Frost Zones.
(The first frost occurs on or before September 21 in 10 percent of the years.)

Median growing season: 153 days. Range: 128 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°) 24.1 28.7 39.8 54.5 68.0 77.4 82.5 79.6 70.9 58.9 43.3 29.0
Ave Daily Low (F°) 5.4 8.5 20.7 34.1 46.1 55.9 61.0 58.2 49.5 39.2 26.4 12.1
Growing Degree Days 0 1 21 116 319 493 653 592 373 167 28 2
Heating Degree Days 1556 1299 1076 621 281 56 6 22 158 498 903 1376
Cooling Degree Days 0 0 0 0 36 107 217 143 14 5 0 0
Ave Precipitation (") 1.23 1.08 2.25 2.85 3.15 3.29 3.28 3.88 3.82 2.37 2.30 1.65
Ave Snowfall (") 11.7 7.9 8.6 1.8 0.0 0.0 0.0 0.0 0.0 0.1 3.7 12.5


Data from the weather station at Oshkosh, latitude 44°02' N, longitude 88°33' W, elevation 750 ft.

Climate Notes

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