The average daily temperature is 72˚ F in the summer and 32˚ F in the winter (USDA 1994). Extremes in temperature range -25˚ F to +105˚F. An average year will have about 170 consecutive days without a killing frost. Average annual precipitation is about 41 inches, of which about 55% of the total falls during the period of April to September.
Severe storms and tornadoes are infrequent with thunderstorms occurring about 50 days per year. The prevailing wind is from the southwest with an average wind speed highest in spring.
The climate along the Ohio River is slightly different from the rest of the county with a longer growing season and less winter precipitation. Also the frequency and thickness of the river’s fogs contribute to a different climate that supports several species only found near the Ohio River (i.e. Bignonia capreolata and Phoradendron serotinum).