Adair County, Oklahoma · Stilwell
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Adair County averages 14 nights a year at 20°F or colder, mostly December to February, and 14% of its homes predate 1960.
May brings the most downpours to Adair County, part of 13.9 heavy-rain days a year. Check the sump first.
14% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
In Adair County, 4.18 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
27% of occupied homes in Adair County heat mainly with wood or propane, above the Oklahoma county median of 12.5%.
About 84 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
Adair County covers 574 square miles of eastern Oklahoma, with about 19,575 residents and 8,148 homes. Besides Stilwell, the county seat, the biggest communities are Westville, Fairfield and Chewey. The county's median home was built in 1982.
44/100 Water Damage Risk Index: Moderate Adair County ranks 55 of 77 Oklahoma counties. See the statewide ranking and method.The three factors where Adair County ranks highest compared with other Oklahoma counties.
For frozen pipes, Adair County is a typical Oklahoma county, which is still plenty. In the 2015–2024 record the county logged about 14 nights a year at or below 20°F (34th of 77) and 72 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 10 days below freezing (ending February 2021), and the low bottomed out near -10°F on February 17, 2021.
The freeze season here runs December to February, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Nov 4 and the last spring freeze around Mar 31.
Heavy rain is a bigger factor here than in most of Oklahoma. The county gets about 52.4 inches of rain and melted snow a year, with 13.9 days of an inch or more (13th of 77). Those downpours cluster in March, April and May, when sump pumps and gutters are tested hardest. The wettest day on record brought 4.18 inches on December 27, 2015. Multi-day storms matter most for basements; the wettest three days on record here totaled 8.39 inches (through December 28, 2015).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 68 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
Roughly 46% of the county's housing was built before 1980. That puts Adair among the newer housing stocks of Oklahoma's 77 counties.
Housing age is mixed: 14% of homes are pre-1960 and 23% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
31% 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 20% 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 84 times a year here, below the Oklahoma county median of 98. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectHeating fuel matters for fire risk. In Adair County it's 30% utility gas, 38% electric, 15% propane and 11% wood. Wood and propane heat are more common here than the state median. Have chimneys swept and fuel-burning appliances serviced each fall, and keep three feet clear around stoves and space heaters.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Adair County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Delaware gets more pipe-freeze nights than Adair. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Adair | Oklahoma median | Rank |
|---|---|---|---|
| Homes built before 1960 | 14% | 24% | 65 of 77 |
| Homes built before 1980 | 46% | 55% | 54 of 77 |
| Homes built 2000 or later | 23% | 22% | 37 of 77 |
| Manufactured or mobile homes | 20% | 12% | 9 of 77 |
| Vacant homes | 13% | 17% | 59 of 77 |
| Wood or propane heat | 27% | 13% | 6 of 77 |
| Nights at 20°F or colder | 14/yr | 13/yr | 34 of 77 |
| Days with 1 inch+ of rain | 14/yr | 11/yr | 13 of 77 |
| Freeze-thaw days | 68/yr | 65/yr | 28 of 77 |
| Muggy nights (65°F+) | 84/yr | 98/yr | 66 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 Adair County: freezing from December to February, heavy rain in March, April and May.
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