Absolute Astronomy Description and Link: //www.absoluteastronomy.com/topics/Cincinnati_slash_Northern_Kentucky_metropolitan_area#encyclopedia
Cincinnati is located within a climatic transition zone; the area is at the extreme northern limit of the humid subtropical climate or at the southern end of the humid continental climate (Koppen climate classification Cfa or Dfa), depending on the criteria used.
The local climate is basically a blend of the subtropics to the south and the mid-latitude area to the north. Evidence of both climatic influences can be found in Cincinnati's landscape material and fauna (see: Southern magnolia, Sweetgum, Bald cypress, and the common wall lizard). The USDA Climate Zone map assigns Cincinnati with a 6a/6b hardiness zone rating (zone 1 being the coldest and zone 11 being the warmest).
More mild "microclimates" of a 7a/b rating may be found, particularly along the Ohio River basin. Cincinnati, which is in the Bluegrass region of the Interior Low Plateau of Ohio, generally receives less snow and has a longer growing season than much of the rest of Ohio.
The summers in Cincinnati are generally hot and humid with cool evenings. The mean annual temperature is 54 °F (12 °C), with an average annual snowfall of 16 inches (58.4 cm) and an average annual rainfall of 41 inches (1,040 mm). The wettest seasons are the spring and summer, although rainfall is fairly constant all year round.
During the winter, particularly in January and February, several days of snow can be expected, allowing for winter sports, although snowfall is lighter than in most of Ohio. January temperatures range from 22 to 39 °F (-6 to 4 °C) and July temperatures range from 66 to 87 °F (19 to 30 °C). The highest recorded temperature was 103.0 °F (39.4 °C) on August 17, 1988, and the lowest recorded temperature was -25°F (-32 °C) on January 18, 1978.