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Climate Data for Portage County, Wisconsin

Climate Normals and Growing Season Summary

Temperature norms and extremes for Portage County, Wisconsin
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 25 in 10 percent of the years.)

Median date of first frost in the fall: September 27. First Fall Frost Zones.
(The first frost occurs on or before September 21 in 10 percent of the years.)

Median growing season: 145 days. Range: 123 to 159 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°) 23.0 28.1 39.7 55.6 68.3 77.0 81.6 78.8 69.9 58.5 42.6 27.6
Ave Daily Low (F°) 4.4 8.4 20.6 34.1 45.0 54.0 59.2 56.9 48.7 38.5 26.1 11.4
Growing Degree Days 0 1 22 128 311 474 624 557 344 161 27 2
Heating Degree Days 1590 1308 1079 603 291 73 11 33 180 512 918 1411
Cooling Degree Days 0 0 0 0 33 88 178 123 9 0 0 0
Ave Precipitation (") 1.02 1.09 2.18 2.98 3.20 3.82 3.65 3.99 4.08 2.40 2.18 1.51
Ave Snowfall (") 9.7 7.7 7.8 1.4 0.0 0.0 0.0 0.0 0.0 0.1 3.9 11.5


Data from the weather station at Stevens Point, latitude 44°30' N, longitude 89°34' W, elevation 1079 ft.

Climate Notes

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