About Galena, IL's Climate & Weather History

With a population of around 3,300, Galena sits in Illinois, United States. The city operates in the Central Time Zone.

In 2025, Galena recorded an average annual temperature of 50°F — about 2.5°F above the 30-year normal of 47°F. The hottest day reached 93°F in June; the coldest was -13°F in January. Total precipitation was 34 inches (drier than usual). Snowfall totaled 9 inches, below the 43-inch average. The wettest month was July.