Shelby County, Illinois · Shelbyville
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With 44% of homes built before 1960 and about 31 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
July brings the most downpours to Shelby County, part of 9.9 heavy-rain days a year. Check the sump first.
44% 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 Shelby County, 3.83 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
35% of occupied homes in Shelby County heat mainly with wood or propane, above the Illinois county median of 16.5%.
Muggy summer nights, lows of 65°F or more, come about 53 times a year in Shelby County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 10,060 homes and around 20,720 residents, Shelby County is 759 square miles of eastern Illinois. Besides Shelbyville, the county seat, the biggest communities are Moweaqua, Windsor and Stewardson. The county's median home was built in 1966.
57/100 Water Damage Risk Index: Elevated Shelby County ranks 28 of 102 Illinois counties. See the statewide ranking and method.The three factors where Shelby County ranks highest compared with other Illinois counties.
For frozen pipes, Shelby County is a typical Illinois county, which is still plenty. In the 2015–2024 record the county logged about 31 nights a year at or below 20°F (60th of 102) and 102 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 14 days below freezing (ending January 2018), and the low bottomed out near -10°F on January 30, 2019.
The freeze season here runs November to March, 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 Oct 25 and the last spring freeze around Apr 14.
Heavy rain is a bigger factor here than in most of Illinois. About 9.9 days a year bring an inch or more (34th of 102), most often in July, out of 43.7 inches of total precipitation. On December 27, 2015, 3.83 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 6.65 inches (through December 29, 2015).
About 80 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
67% of homes in Shelby County predate 1980, close to the Illinois county median of 65.9%, which ranks 49th of Illinois's 102 counties.
Before 1960 is when 44% 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.
7% of homes are manufactured or mobile homes, above the Illinois county median of 5.6%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
Beyond water
About 53 nights a year in Shelby County stay at 65°F or warmer, a sign of muggy summer air (43rd of 102 counties). July is the wettest month. 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 expectBy main heating fuel, Shelby County homes break down as 44% utility gas, 22% electric, 31% propane and 4% 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 Shelby County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Christian, Macon and Moultrie get more pipe-freeze nights than Shelby. Macon County has the oldest housing nearby, with 75% of homes built before 1980.
By the numbers
| Factor | Shelby | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 44% | 38% | 36 of 102 |
| Homes built before 1980 | 67% | 66% | 49 of 102 |
| Homes built 2000 or later | 15% | 15% | 48 of 102 |
| Manufactured or mobile homes | 7% | 5.6% | 41 of 102 |
| Vacant homes | 11% | 11% | 42 of 102 |
| Wood or propane heat | 35% | 17% | 7 of 102 |
| Nights at 20°F or colder | 31/yr | 35/yr | 60 of 102 |
| Days with 1 inch+ of rain | 9.9/yr | 8.4/yr | 34 of 102 |
| Freeze-thaw days | 80/yr | 81/yr | 55 of 102 |
| Muggy nights (65°F+) | 53/yr | 51/yr | 43 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 Shelby County: freezing from November to March, heavy rain in June, 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