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Climate Data for Iowa County, Wisconsin

Climate Normals and Growing Season Summary

Temperature norms and extremes for Iowa County
Chart courtesy of the Midwestern Regional Climate Center.

Growing Season Summary:

Median date of last frost in the spring: May 8. Last Spring Frost Zones.
(The last frost occurs on or after April 26 in 10 percent of the years.)

Median date of first frost in the fall: October 4. First Fall Frost Zones.
(The first frost occurs on or before September 23 in 10 percent of the years.)

Median growing season: 153 days. Range: 133 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°) 23.9 28.9 41.3 56.6 67.9 77.6 81.9 79.4 70.8 59.4 43.4 28.9
Ave Daily Low (F°) 5.9 9.9 22.9 35.1 45.9 55.2 60.2 58.0 49.4 38.7 26.0 12.3
Growing Degree Days 1 1 36 150 334 514 646 580 375 176 34 2
Heating Degree Days 1553 1277 1020 576 274 53 8 32 159 498 909 1376
Cooling Degree Days 0 0 0 0 26 95 197 146 12 5 0 0
Ave Precipitation (") 1.18 1.17 2.57 3.15 3.41 3.78 4.06 4.40 3.71 2.36 2.22 1.75
Ave Snowfall (") 8.0 7.2 7.5 1.9 0.1 0.0 0.0 0.0 0.0 0.2 3.8 10.5


Data from the weather station at Dodgeville, latitude 42°58' N, longitude 90°07' W, elevation 1110 ft.

Climate Notes

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