Surrounded by a nearly flat plain that is 50 to 100 feet below the elevation of the adjacent rolling countryside Dayton is situated near the center of the Miami River Valley. The Mad River, the Stillwater River, and Wolf Creek, all tributaries of the Miami River, join the master stream within the city limits. The Miami Valley is a fertile agricultural region because of evenly distributed precipitation and moderate temperatures. High relative humidity throughout the year can cause discomfort to people with allergies. Winter temperatures are moderated by the downward slope of the Miami River; cold polar air from the Great Lakes produces extensive cloudiness and frequent snow flurries, but snow accumulation averages only nine inches annually.
Area: 56.63 square miles (2000)
Elevation: 750 feet above sea level
Average Temperatures: January, 26.6° F; July, 74.7° F; annual average, 51.7° F
Average Annual Precipitation: 36.6 inches