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Climate Data for Polk County, Wisconsin

Climate Normals and Growing Season Summary

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

Growing Season Summary:

Median date of last frost in the spring: May 11. 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 29. First Fall Frost Zones.
(The first frost occurs on or before September 23 in 10 percent of the years.)

Median growing season: 143 days. Range: 125 to 160 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°) 21.0 27.5 40.1 56.9 69.9 78.5 83.4 80.3 70.4 58.8 41.0 25.5
Ave Daily Low (F°) -1.7 3.7 18.6 33.1 44.9 54.3 59.7 57.4 48.0 36.9 23.2 6.6
Growing Degree Days 0 1 22 137 336 502 648 579 346 161 23 1
Heating Degree Days 1714 1383 1104 600 274 67 20 31 189 530 987 1516
Cooling Degree Days 0 0 0 0 38 109 225 152 15 0 0 0
Ave Precipitation (") 0.91 0.72 1.67 2.68 3.41 4.46 3.57 4.55 3.65 2.54 1.44 1.03
Ave Snowfall (") 11.2 6.4 8.8 1.3 0.0 0.0 0.0 0.0 0.0 0.1 4.9 9.4


Data from the weather station at St Croix Falls, latitude 45°25' N, longitude 92°39' W, elevation 770 ft.

Climate Notes

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