Cincinnati is at the southern limit , bordering the humid subtropical climate zone (Cfa). Summers are hot and humid, with significant rainfall in each month and highs reaching 90 °F (32 °C) or above on 21 days per year, often with high dew points and humidity. July is the warmest month, with a daily average temperature of 75.9 °F (24.4 °C).
Winters tend to be cold and snowy, with January, the coldest month, averaging at 30.8 °F (−0.7 °C). Lows reach 0 °F (−18 °C) on an average 2.6 nights yearly. An average winter will see around 22.1 inches (56 cm) of snowfall, contributing to the yearly 42.5 inches (1,080 mm) of precipitation, with rainfall peaking in spring. Extremes range from −25 °F (−32 °C) on January 18, 1977, up to 108 °F (42 °C) on July 21 and 22, 1934. Severe thunderstorms are common in the warmer months, and tornadoes, while infrequent, are not unknown, with such events striking the Greater Cincinnati area most recently in 1974, 1999, 2012, and 2017.