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Hanover, WI Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Hanover, a community in Rock County, Wisconsin.

Today
72°F
Showers And Thunderstorms
Showers and thunderstorms before 10am, then a chance of showers and thunderstorms between 10am and 11am, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a high near 72. Southeast wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.

7-day forecast for Hanover

WhenTempForecastWindPrecip
Today 72°F Showers And Thunderstorms 5 to 10 mph SE 100%
Tonight 60°F Showers And Thunderstorms 5 to 15 mph E 84%
Sunday 65°F Rain Showers 15 mph NE 79%
Sunday Night 52°F Cloudy then Slight Chance Rain Showers 15 mph NE 15%
Monday 62°F Slight Chance Rain Showers 15 mph NE 24%
Monday Night 48°F Slight Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 19%
Tuesday 61°F Partly Sunny 10 to 15 mph NE 11%
Tuesday Night 46°F Partly Cloudy 5 to 10 mph NE 5%
Wednesday 64°F Mostly Sunny 10 to 15 mph NE 3%
Wednesday Night 49°F Partly Cloudy 5 to 10 mph NE 1%
Thursday 66°F Mostly Sunny 5 to 10 mph NE 4%
Thursday Night 49°F Partly Cloudy 0 to 5 mph NE 4%
Friday 69°F Mostly Sunny 5 to 10 mph NE 4%
Friday Night 50°F Partly Cloudy 0 to 5 mph E 3%

Forecast source: National Weather Service (api.weather.gov) for Hanover (42.639, -89.171). Updated through the day.

Growing snapshot for Hanover

Last spring frost
Apr 26
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
5b

More local growing data for Hanover: nearby ZIP 53537 weather · frost dates · planting calendar · Wisconsin frost dates

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Climate data from the nearest NOAA station, Afton - Janesville Wwtp, Wi (7.8 mi from Hanover). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.