Prairie Grove is a city of approximately 1,900 people in Illinois, United States. Located in the Central Time Zone at 42.3°N latitude.
In 2025, Prairie Grove recorded an average annual temperature of 50°F — about 1.3°F below the 30-year normal of 51°F. The hottest day reached 93°F in June; the coldest was -11°F in February. Total precipitation was 32 inches (near normal). The wettest month was July.
View current conditions and forecast for Prairie Grove · More cities in Illinois