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Climate Data for Jefferson 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 5. Last Spring Frost Zones.
(The last frost occurs on or after May 14 in 10 percent of the years.)

Median date of first frost in the fall: October 6. First Fall Frost Zones.
(The first frost occurs on or before September 23 in 10 percent of the years.)

Median growing season: 156 days. Range: 136 to 182 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°) 26.6 32.0 43.7 59.0 71.7 80.4 84.5 82.1 74.3 62.2 46.2 31.4
Ave Daily Low (F°) 7.9 11.9 23.6 35.9 46.5 55.8 61.1 58.5 50.8 40.5 28.8 14.7
Growing Degree Days 0 2 37 161 359 535 675 610 413 202 40 3
Heating Degree Days 1479 1207 970 525 227 38 0 18 103 431 825 1302
Cooling Degree Days 0 0 0 0 44 131 246 182 31 10 0 0
Ave Precipitation (") 1.29 1.13 2.30 3.05 3.17 3.51 3.85 4.05 3.89 2.39 2.28 1.87
Ave Snowfall (") 9.6 7.0 6.4 1.4 0.1 0.0 0.0 0.0 0.0 0.1 2.3 10.7


Data from the weather station at Lake Mills, latitude 43°04' N, longitude 88°55' W, elevation 850 ft.

Climate Notes

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