Fayette County, Illinois · Vandalia
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Pipes freeze in Fayette County on about 28 nights a year, mostly November to February. Older homes, 38% of the stock here, are most at risk.
Basements flood here mostly in July. Fayette County averages 10.5 days a year with an inch of rain or more.
Sewage backups in Fayette County spike on heavy-rain days, about 10.5 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 74 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
35% of occupied homes in Fayette County heat mainly with wood or propane, above the Illinois county median of 16.5%.
With 58 muggy nights a year, mold in Fayette County can appear within days of a leak. Dry first, then clean.
Local risk profile
Fayette County covers 716 square miles of central Illinois, with about 21,315 residents and 8,808 homes. Vandalia is the county seat; St. Elmo, Ramsey and Brownstown are the next largest communities. Half the homes here were built before 1972, half after.
53/100 Water Damage Risk Index: Elevated Fayette County ranks 38 of 102 Illinois counties. See the statewide ranking and method.The three factors where Fayette County ranks highest compared with other Illinois counties.
Pipe-freeze risk in Fayette County sits near the middle of the state. From 2015–2024 it averaged 28 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 93 nights at or below 32°F. That ranks 67th of 102 counties.
On December 23, 2022 the low fell to about -8°F, and in the stretch ending January 2018 the county went 14 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
The freeze season here runs November 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.
Freezing nights typically start around Oct 25 and end around Apr 13.
Heavy rain is a bigger factor here than in most of Illinois. About 10.5 days a year bring an inch or more (27th of 102), most often in July, out of 44.8 inches of total precipitation. On December 27, 2015, 3.51 inches fell in a single day. The worst three-day stretch dropped 6.49 inches, ending December 29, 2015, the kind of soaking that overwhelms sump pumps and storm sewers.
About 74 days a year swing from below freezing at night to above freezing by day. Those freeze-thaw cycles feed ice dams on roofs, open cracks in foundations and driveways, and stress pipes that are already marginal.
Housing
Illinois's 102 counties range widely in housing age; Fayette ranks 57th, with 64% of its homes built before 1980.
The mix runs from 38% built before 1960 to 14% built since 2000, so older neighborhoods bring aging pipe while newer subdivisions bring failed appliance lines and water heaters.
About 22% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Manufactured and mobile homes make up 12% 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 58 times a year here, above the Illinois county median of 51. 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 Fayette County it's 46% utility gas, 18% electric, 31% propane and 3% 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 Fayette County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Montgomery and Shelby get more pipe-freeze nights than Fayette. Montgomery County has the oldest housing nearby, with 71% of homes built before 1980.
By the numbers
| Factor | Fayette | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 38% | 38% | 52 of 102 |
| Homes built before 1980 | 64% | 66% | 57 of 102 |
| Homes built 2000 or later | 14% | 15% | 53 of 102 |
| Manufactured or mobile homes | 12% | 5.6% | 19 of 102 |
| Vacant homes | 11% | 11% | 44 of 102 |
| Wood or propane heat | 35% | 17% | 7 of 102 |
| Nights at 20°F or colder | 28/yr | 35/yr | 67 of 102 |
| Days with 1 inch+ of rain | 11/yr | 8.4/yr | 27 of 102 |
| Freeze-thaw days | 74/yr | 81/yr | 67 of 102 |
| Muggy nights (65°F+) | 58/yr | 51/yr | 39 of 102 |
Rank 1 is the highest value. Bars run from the lowest to the highest Illinois county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Fayette County: freezing from November to February, heavy rain in April, July and August.
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