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Climate Data for Columbia County, Wisconsin

Climate Normals and Growing Season Summary


Chart courtesy of the Midwestern Regional Climate Center.

Growing Season Summary:

Median date of last frost in the spring: May 14. Last Spring Frost Zones.
(The last frost occurs on or after May 31 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 15 in 10 percent of the years.)

Median growing season: 139 days. Range: 109 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°) 24.7 29.6 41.8 57.0 69.1 78.7 83.1 80.1 71.2 60.4 44.1 29.5
Ave Daily Low (F°) 5.0 8.7 22.1 34.3 44.6 53.6 58.4 55.8 47.3 37.4 25.7 12.2
Growing Degree Days 0 2 38 164 360 523 645 577 390 200 39 3
Heating Degree Days 1556 1282 1026 582 286 77 16 45 187 506 903 1367
Cooling Degree Days 0 0 0 0 35 113 196 138 16 7 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 (") 9.0 7.5 6.5 1.5 0.0 0.0 0.0 0.0 0.0 0.1 2.5 8.8


Data from the weather station at Portage, latitude 43°31' N, longitude 89°26' W, elevation 800 ft.

Climate Notes

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