Lying in the humid continental zone, Ohio has a generally temperate climate. Winters are cold and summers mild in the eastern highlands. The southern region has the warmest temperatures and longest growing season 198 days on the average, compared with 150 to 178 days in the remainder of the state. More than half of the annual rainfall occurs during the growing season, from May to October.

Ohio English reflects three post-Revolutionary migration paths. Into the Western Reserve south of Lake Erie came Northern speech from New York and Connecticut. Still common there are the Northern pronunciation of the ow diphthong, as in cow, with a beginning like the /ah/ vowel in father, and the use of the /ah/ in fog and college; /krik/ is more common than /kreek/ for creek.

The United States dollar, denoted by USD or the symbol $, is the official currency used in the United States. Commonly referred to as the "American dollar, " the currency is divided into 100 cents (symbol )

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From just over 45, 000 residents in 1800, Ohio's population grew at rates of over 10% per decade until the census of 1970, which recorded just over 10.65 million Ohioans. Growth then slowed for the next three decades, and approximately 11.35 million people resided in Ohio in 2000.