With a population of around 1,100, Royalton sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, Royalton recorded an average annual temperature of 58°F — about 1.4°F above the 30-year normal of 56°F. The hottest day reached 95°F in August; the coldest was 2°F in February. Total precipitation was 45 inches (near normal). The wettest month was April.
View current conditions and forecast for Royalton · More cities in Illinois