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Climate Data for Green County, Wisconsin

Climate Normals and Growing Season Summary

Temperature norms and extremes for Green 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 27 in 10 percent of the years.)

Median date of first frost in the fall: September 29. First Fall Frost Zones.
(The first frost occurs on or before September 14 in 10 percent of the years.)

Median growing season: 146 days. Range: 122 to 156 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°) 25.5 30.2 42.7 57.6 69.8 79.7 83.7 81.0 73.2 61.6 45.8 30.9
Ave Daily Low (F°) 5.4 9.9 22.9 34.9 45.4 54.6 59.4 56.5 47.9 36.7 25.7 12.1
Growing Degree Days 1 3 38 154 333 516 638 584 393 200 44 5
Heating Degree Days 1535 1257 998 561 266 45 8 31 153 499 873 1345
Cooling Degree Days 0 0 0 0 37 111 213 149 21 9 0 0
Ave Precipitation (") 1.15 1.16 2.33 3.30 3.29 4.02 3.88 4.06 3.86 2.69 2.15 1.83
Ave Snowfall (") 7.5 5.5 6.7 1.6 0.0 0.0 0.0 0.0 0.0 0.1 1.3 8.6


Data from the weather station at Brodhead, latitude 42°37' N, longitude 89°23' W, elevation 790 ft.

Climate Notes

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