Randolph County, Illinois · Chester
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Pipes freeze in Randolph County on about 22 nights a year, mostly November to February. Older homes, 37% of the stock here, are most at risk.
Basements flood here mostly in March. Randolph County averages 10 days a year with an inch of rain or more.
Sewage backups in Randolph County spike on heavy-rain days, about 10 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 70 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
16% of occupied homes in Randolph County heat mainly with wood or propane, close to the Illinois county median of 16.5%.
With 75 muggy nights a year, mold in Randolph County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 13,422 homes and around 30,058 residents, Randolph County is 575 square miles of southern Illinois. Besides Chester, the county seat, the biggest communities are Sparta, Red Bud and Steeleville. Half the homes here were built before 1972, half after.
48/100 Water Damage Risk Index: Elevated Randolph County ranks 64 of 102 Illinois counties. See the statewide ranking and method.The three factors where Randolph County ranks highest compared with other Illinois counties.
Winters here are on the gentler end for Illinois, and pipes still freeze. In the 2015–2024 record the county logged about 22 nights a year at or below 20°F (84th of 102) and 84 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
The longest cold spell was straight 14 days without the temperature rising above freezing, ending in January 2018. The coldest night reached about -5°F on December 23, 2022. Burst pipes usually show up when a spell like that breaks and the ice thaws.
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 1.
Heavy rain is a bigger factor here than in most of Illinois. Of roughly 44 inches of yearly precipitation, the damage comes from the 10 days a year with an inch or more, ranked 32nd of 102. March, April and November see the most. The single wettest day in the record: 3.89 inches, April 30, 2017. The worst three-day stretch dropped 7.5 inches, ending May 1, 2017, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 70 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 64% of the county's housing was built before 1980. That puts Randolph near the middle of Illinois's 102 counties.
Housing age is mixed: 37% of homes are pre-1960 and 15% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
Here 14% of housing is manufactured homes. Check the skirting and the heat tape on the main water line every fall, because that one exposed line is what freezes.
Beyond water
About 75 nights a year in Randolph County stay at 65°F or warmer, a sign of muggy summer air (13th of 102 counties). May is the wettest month. 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, Randolph County homes break down as 45% utility gas, 37% electric, 14% propane and 2% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Randolph County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Perry, St. Clair and Washington get more pipe-freeze nights than Randolph. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Randolph | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 37% | 38% | 58 of 102 |
| Homes built before 1980 | 64% | 66% | 57 of 102 |
| Homes built 2000 or later | 15% | 15% | 46 of 102 |
| Manufactured or mobile homes | 14% | 5.6% | 16 of 102 |
| Vacant homes | 11% | 11% | 48 of 102 |
| Wood or propane heat | 16% | 17% | 55 of 102 |
| Nights at 20°F or colder | 22/yr | 35/yr | 84 of 102 |
| Days with 1 inch+ of rain | 10/yr | 8.4/yr | 32 of 102 |
| Freeze-thaw days | 70/yr | 81/yr | 78 of 102 |
| Muggy nights (65°F+) | 75/yr | 51/yr | 13 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 Randolph County: freezing from November to February, heavy rain in March, April and November.
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