Climate in Marietta

Marietta has a real, genuine four-season Ohio climate, but its most consequential hazard is not tornado or hurricane risk -- it's the historically severe flood risk carried by its real Ohio-Muskingum River confluence setting.

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A genuine four-season Appalachian-Ohio climate

Marietta experiences the same broad cold-winter, warm-summer, real statewide tornado-corridor pattern documented across this project's other Ohio markets, with zero hurricane risk as an inland state.

A real, historically catastrophic river-flood risk, disclosed honestly

Marietta's flood history dates to 1790, with genuinely catastrophic 20th-century events: the March 1913 flood crested at 58.7 feet, sweeping away 120 homes and knocking 200 more off their foundations, with water 8 feet deep in the old Post Office; the January 1937 flood covered 46% of the city, with downtown under 8-16 feet of water. This is a real, distinct, disclosed hazard identity for Marietta's river-confluence setting.

The city maintains real, current flood-monitoring resources

The City of Marietta provides real, current flood-warning and GIS flood-information resources for residents, including links to National Weather Service and USGS river-level data -- a genuine, practical resource for anyone living near the rivers.

Key takeaways

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Last reviewed: 2026-08-25. Independent research; not financial, tax, or legal advice -- confirm current figures with a local professional before making a decision.