About Monona, WI's Climate & Weather History

With a population of around 8,200, Monona sits in Wisconsin, United States. The city operates in the Central Time Zone.

In 2025, Monona recorded an average annual temperature of 48°F — about 1.3°F above the 30-year normal of 47°F. The hottest day reached 91°F in June; the coldest was -12°F in February. Total precipitation was 29 inches (drier than usual). Snowfall totaled 11 inches, below the 52-inch average. The wettest month was June.