Logan County, Illinois · Lincoln
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Pipes freeze in Logan County on about 36 nights a year, mostly November to March. Older homes, 44% of the stock here, are most at risk.
Basements flood here mostly in July. Logan County averages 7.1 days a year with an inch of rain or more.
Sewage backups in Logan County spike on heavy-rain days, about 7.1 a year, when sewer mains fill up and water finds the lowest drain.
Logan County's wettest day in the 2015–2024 record brought 2.52 inches, and about 82 freeze-thaw days a year mean ice dams in some winters.
10% of occupied homes in Logan County heat mainly with wood or propane, below the Illinois county median of 16.5%.
About 50 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
About 27,713 people live in Logan County, 618 square miles in central Illinois, in roughly 11,967 homes. The county seat is Lincoln, and Atlanta, Mount Pulaski and Elkhart round out the largest towns. The county's median home was built in 1964.
47/100 Water Damage Risk Index: Elevated Logan County ranks 68 of 102 Illinois counties. See the statewide ranking and method.The three factors where Logan County ranks highest compared with other Illinois counties.
For frozen pipes, Logan County is a typical Illinois county, which is still plenty. From 2015–2024 it averaged 36 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 107 nights at or below 32°F. That ranks 46th of 102 counties.
Cold snaps are the real risk. The worst in the record lasted 15 days below freezing (ending February 2021), and the low bottomed out near -17°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 23 and the last spring freeze around Apr 18.
Logan gets fewer downpours than most Illinois counties, but they still fill basements. About 7.1 days a year bring an inch or more (79th of 102), most often in July, out of 39.1 inches of total precipitation. On November 5, 2024, 2.52 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 4.31 inches (through December 29, 2015).
The temperature crosses 32°F in both directions on roughly 82 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
78% of homes in Logan County predate 1980, above the Illinois county median of 65.9%, which ranks 11th of Illinois's 102 counties.
In Logan County 44% of homes are older than 1960. If yours is one of them and the plumbing has never been replaced, expect galvanized steel supply pipe and cast iron drain lines, the two materials most likely to fail quietly.
Renters occupy 32% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
About 50 nights a year in Logan County stay at 65°F or warmer, a sign of muggy summer air (54th of 102 counties). May 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 expectHeating fuel matters for fire risk. In Logan County it's 66% utility gas, 22% electric, 10% propane and under 1% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Logan County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
De Witt, Mason, McLean and Tazewell get more pipe-freeze nights than Logan. Mason County has the oldest housing nearby, with 82% of homes built before 1980.
By the numbers
| Factor | Logan | Illinois median | Rank |
|---|---|---|---|
| Homes built before 1960 | 44% | 38% | 39 of 102 |
| Homes built before 1980 | 78% | 66% | 11 of 102 |
| Homes built 2000 or later | 7.1% | 15% | 99 of 102 |
| Manufactured or mobile homes | 3.2% | 5.6% | 72 of 102 |
| Vacant homes | 5.9% | 11% | 93 of 102 |
| Wood or propane heat | 10% | 17% | 74 of 102 |
| Nights at 20°F or colder | 36/yr | 35/yr | 46 of 102 |
| Days with 1 inch+ of rain | 7.1/yr | 8.4/yr | 79 of 102 |
| Freeze-thaw days | 82/yr | 81/yr | 40 of 102 |
| Muggy nights (65°F+) | 50/yr | 51/yr | 54 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 Logan 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