Marion County, Ohio · Marion
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Marion County averages 33 nights a year at 20°F or colder, mostly November to March, and 46% of its homes predate 1960.
Heavy rain days of an inch or more come about 3.4 times a year here, most often in June. A sump pump that hasn't run since last season is a common weak point.
Sewage backups in Marion County spike on heavy-rain days, about 3.4 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 79 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
13% of occupied homes in Marion County heat mainly with wood or propane, below the Ohio county median of 15.9%.
About 37 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
With 27,358 homes and around 65,020 residents, Marion County is 404 square miles of central Ohio. Marion is the county seat; Prospect, La Rue and Green Camp are the next largest communities. Half the homes here were built before 1963, half after.
56/100 Water Damage Risk Index: Elevated Marion County ranks 28 of 88 Ohio counties. See the statewide ranking and method.The three factors where Marion County ranks highest compared with other Ohio counties.
Marion County gets more hard-freeze nights than most of Ohio. In the 2015–2024 record the county logged about 33 nights a year at or below 20°F (27th of 88) and 106 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 18 days below freezing (ending March 2015), and the low bottomed out near -8°F on January 21, 2019.
Expect the hardest freezes in January, inside a season that runs November to March. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
Freezing nights typically start around Oct 27 and end around Apr 21.
Marion gets fewer downpours than most Ohio counties, but they still fill basements. The county gets about 37.2 inches of rain and melted snow a year, with 3.4 days of an inch or more (84th of 88). Those downpours cluster in March, June and July, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.09 inches on September 8, 2020. The worst three-day stretch dropped 3.1 inches, ending August 25, 2023, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 79 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
74% of homes in Marion County predate 1980, above the Ohio county median of 61.1%, which ranks 9th of Ohio's 88 counties.
Before 1960 is when 46% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
Renters occupy 33% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
Marion County averages 37 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in June. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectBy main heating fuel, Marion County homes break down as 61% utility gas, 24% electric, 11% propane and 2% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Marion County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Crawford, Morrow and Union get more pipe-freeze nights than Marion. All of its neighbors see more heavy-rain days. Crawford County has the oldest housing nearby, with 80% of homes built before 1980.
By the numbers
| Factor | Marion | Ohio median | Rank |
|---|---|---|---|
| Homes built before 1960 | 46% | 37% | 12 of 88 |
| Homes built before 1980 | 74% | 61% | 9 of 88 |
| Homes built 2000 or later | 11% | 17% | 74 of 88 |
| Manufactured or mobile homes | 4.6% | 5.9% | 51 of 88 |
| Vacant homes | 9.8% | 8.4% | 32 of 88 |
| Wood or propane heat | 13% | 16% | 53 of 88 |
| Nights at 20°F or colder | 33/yr | 31/yr | 27 of 88 |
| Days with 1 inch+ of rain | 3.4/yr | 5.7/yr | 84 of 88 |
| Freeze-thaw days | 79/yr | 82/yr | 64 of 88 |
| Muggy nights (65°F+) | 37/yr | 35/yr | 32 of 88 |
Rank 1 is the highest value. Bars run from the lowest to the highest Ohio county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Marion County: freezing from November to March, heavy rain in March, June and July.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology