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Temperatures and rainfall in Ohio


The climate of Ohio is characterized by warm to hot summers and mild to cold winters. The state receives both cold dry polar air from Canada and warm humid air from the Gulf of Mexico. Both air masses move alternately across the area, making changeability its chief characteristic. In winter, polar air is dominant, often coming in conflict with modified Gulf air and causing frontal or cyclonic storms. Gulf air is dominant in summer. In fall, polar air passing over Lake Erie is modified, delaying the killing frost along the adjacent shoreline. The mean annual temperatures for the state range from 9° C (48° F) in the northeast to 13° C (55° F) in the south. Average January temperatures range from -4° C (24° F) in the west to 2° C (35° F) in the south. July averages are 24° C (76° F) in the south and 23° C (73° F) in the northeast.

Climatic map of Ohio state


Climatic map of Ohio
Climatic map of Ohio

Ohio normally has abundant precipitation, well distributed throughout the year. The average annual precipitation varies from 710 mm (28 in) at Catawba Island, a resort on Lake Erie, to 1,170 mm (46 in) in the elevated land between the Miami and Scioto rivers. Snows do occur but usually melt within one or two weeks. The growing season, or period between the last killing frost in the spring and the first killing frost in the fall, is longest along Lake Erie, where it is more than 200 days. At the divide between the Lake Erie and Ohio River drainage systems, the growing season is 160 days, and in the southwest it is 190 days. The shortest growing season, 140 days, is in the higher elevations of the northeast. The hilly southeast and the extreme northwest have a growing season of 160 days. "Ohio" © Emmanuel BUCHOT, Encarta, Wikipedia

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