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Climate Data for Rock 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: April 27. Last Spring Frost Zones.
(The last frost occurs on or after May 10 in 10 percent of the years.)

Median date of first frost in the fall: October 8. First Fall Frost Zones.
(The first frost occurs on or before September 26 in 10 percent of the years.)

Median growing season: 172 days. Range: 145 to 186 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°) 26.3 30.6 43.3 58.3 70.0 80.2 83.7 80.9 73.2 62.4 46.0 31.5
Ave Daily Low (F°) 8.8 12.7 24.2 36.0 46.3 57.1 61.6 58.9 50.7 39.9 28.2 15.6
Growing Degree Days 1 3 42 173 364 554 684 599 420 218 45 5
Heating Degree Days 1469 1212 967 534 254 29 0 19 119 438 837 1283
Cooling Degree Days 0 0 0 0 43 140 243 171 29 10 0 0
Ave Precipitation (") 1.17 1.06 2.27 3.13 3.05 3.77 3.89 4.02 3.97 2.38 2.51 1.83
Ave Snowfall (") 6.8 6.3 5.5 0.9 0.0 0.0 0.0 0.0 0.0 0.0 1.1 7.0


Data from the weather station at Beloit, latitude 42°30' N, longitude 89°02' W, elevation 780 ft.

Climate Notes

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