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Climate Data for Washington 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 10. 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: October 5. First Fall Frost Zones.
(The first frost occurs on or before September 23 in 10 percent of the years.)

Median growing season: 155 days. Range: 134 to 165 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°) 25.3 29.7 40.7 54.8 67.6 77.1 81.6 79.2 71.4 59.4 44.6 30.4
Ave Daily Low (F°) 9.1 13.3 24.1 34.5 43.9 53.3 59.2 57.6 50.1 40.0 28.9 15.6
Growing Degree Days 0 1 26 115 297 472 619 570 370 170 33 3
Heating Degree Days 1482 1218 1011 609 313 78 13 32 145 481 846 1302
Cooling Degree Days 0 0 0 0 28 84 180 137 19 6 0 0
Ave Precipitation (") 1.21 0.93 1.95 2.93 2.92 3.51 3.79 3.80 4.13 2.66 2.44 1.72
Ave Snowfall (") 12.1 9.6 8.8 2.5 0.1 0.0 0.0 0.0 0.0 0.2 3.5 13.1


Data from the weather station at West Bend, latitude 43°42' N, longitude 88°11' W, elevation 940 ft.

Climate Notes

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