Troy is a city of approximately 10,000 people in Illinois, United States. Located in the Central Time Zone at 38.7°N latitude.
In 2025, Troy recorded an average annual temperature of 56°F — about 1.8°F below the 30-year normal of 58°F. The hottest day reached 94°F in July; the coldest was -0°F in January. Total precipitation was 44 inches (near normal). Snowfall totaled 6 inches, below the 11-inch average. The wettest month was April.
View current conditions and forecast for Troy · More cities in Illinois