Seminole County, Oklahoma · Wewoka
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Seminole County averages 12 nights a year at 20°F or colder, mostly December to February, and 30% of its homes predate 1960.
Heavy rain days of an inch or more come about 13.4 times a year here, most often in May. A sump pump that hasn't run since last season is a common weak point.
Sewage backups in Seminole County spike on heavy-rain days, about 13.4 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 62 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
17% of occupied homes in Seminole County heat mainly with wood or propane, above the Oklahoma county median of 12.5%.
With 98 muggy nights a year, mold in Seminole County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 23,494 people live in Seminole County, 633 square miles in eastern Oklahoma, in roughly 10,838 homes. Besides Wewoka, the county seat, the biggest communities are Seminole, Konawa and Bowlegs. Half the homes here were built before 1976, half after.
58/100 Water Damage Risk Index: Elevated Seminole County ranks 15 of 77 Oklahoma counties. See the statewide ranking and method.The three factors where Seminole County ranks highest compared with other Oklahoma counties.
Pipe-freeze risk in Seminole County sits near the middle of the state. It averaged 66 freezing nights a year over 2015–2024, 12 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 77 Oklahoma counties that's 41st.
On February 17, 2021 the low fell to about -11°F, and in the stretch ending February 2021 the county went 10 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Most freezing nights fall from December to February, peaking in January. Disconnect garden hoses and shut off outdoor spigots before the first hard frost, and keep the heat at 55°F or higher if you'll be away.
Freezing nights typically start around Nov 5 and end around Mar 30.
Heavy rain is a bigger factor here than in most of Oklahoma. The county gets about 45.2 inches of rain and melted snow a year, with 13.4 days of an inch or more (19th of 77). Those downpours cluster in April, May and June, when sump pumps and gutters are tested hardest. The wettest day on record brought 5.03 inches on September 22, 2018. The worst three-day stretch dropped 7.57 inches, ending November 5, 2024, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 62 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
56% of homes in Seminole County predate 1980, close to the Oklahoma county median of 54.8%, which ranks 33rd of Oklahoma's 77 counties.
Before 1960 is when 30% 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.
24% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
Manufactured and mobile homes make up 14% of the housing here. Water lines in the underbelly depend on intact skirting and working heat tape, and they're usually the first to freeze in a cold snap.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 98 times a year here, close to the Oklahoma county median of 98. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectHeating fuel matters for fire risk. In Seminole County it's 34% utility gas, 48% electric, 14% propane and 2% wood. Propane heat is above the Oklahoma norm. Annual chimney and vent inspection, which the NFPA recommends, is one of the most effective fire-prevention habits for these homes.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Seminole County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Pottawatomie gets more pipe-freeze nights than Seminole. Hughes County has the oldest housing nearby, with 64% of homes built before 1980.
By the numbers
| Factor | Seminole | Oklahoma median | Rank |
|---|---|---|---|
| Homes built before 1960 | 30% | 24% | 29 of 77 |
| Homes built before 1980 | 56% | 55% | 33 of 77 |
| Homes built 2000 or later | 20% | 22% | 44 of 77 |
| Manufactured or mobile homes | 14% | 12% | 32 of 77 |
| Vacant homes | 19% | 17% | 32 of 77 |
| Wood or propane heat | 17% | 13% | 26 of 77 |
| Nights at 20°F or colder | 12/yr | 13/yr | 41 of 77 |
| Days with 1 inch+ of rain | 13/yr | 11/yr | 19 of 77 |
| Freeze-thaw days | 62/yr | 65/yr | 42 of 77 |
| Muggy nights (65°F+) | 98/yr | 98/yr | 39 of 77 |
Rank 1 is the highest value. Bars run from the lowest to the highest Oklahoma county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Seminole County: freezing from December to February, heavy rain in April, May and June.
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