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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.

Tonight
60°F
Chance Showers And Thunderstorms
A slight chance of rain showers before 10pm, then a chance of showers and thunderstorms between 10pm and 2am, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 60. East wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

7-day forecast for Hanover

WhenTempForecastWindPrecip
Tonight 60°F Chance Showers And Thunderstorms 10 mph E 89%
Saturday 74°F Showers And Thunderstorms 10 mph SE 92%
Saturday Night 60°F Showers And Thunderstorms 5 to 10 mph NE 80%
Sunday 66°F Rain Showers Likely 15 mph NE 55%
Sunday Night 53°F Chance Rain Showers then Mostly Cloudy 15 mph NE 37%
Monday 62°F Chance Rain Showers 15 mph NE 37%
Monday Night 49°F Chance Rain Showers 10 to 15 mph NE 37%
Tuesday 61°F Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 27%
Tuesday Night 47°F Mostly Cloudy 5 to 10 mph NE 9%
Wednesday 64°F Mostly Sunny 5 to 10 mph NE 6%
Wednesday Night 48°F Partly Cloudy 5 to 10 mph NE 2%
Thursday 66°F Partly Sunny 5 mph NE 7%
Thursday Night 50°F Partly Cloudy 0 to 5 mph NE 5%
Friday 68°F Mostly Sunny 0 to 5 mph NE 5%

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.