Audrain County, Missouri · Mexico
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Pipes freeze in Audrain County on about 33 nights a year, mostly November to February. Older homes, 37% of the stock here, are most at risk.
June brings the most downpours to Audrain County, part of 7.7 heavy-rain days a year. Check the sump first.
37% 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.
Audrain County's wettest day in the 2015–2024 record brought 3.72 inches, and about 76 freeze-thaw days a year mean ice dams in some winters.
14% of occupied homes in Audrain County heat mainly with wood or propane, below the Missouri county median of 24.5%.
About 60 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 24,548 people live in Audrain County, 692 square miles in northern Missouri, in roughly 10,561 homes. Besides Mexico, the county seat, the biggest communities are Vandalia, Laddonia and Martinsburg. Half the homes here were built before 1970, half after.
53/100 Water Damage Risk Index: Elevated Audrain County ranks 46 of 114 Missouri counties. See the statewide ranking and method.The three factors where Audrain County ranks highest compared with other Missouri counties.
Audrain County gets more hard-freeze nights than most of Missouri. It averaged 99 freezing nights a year over 2015–2024, 33 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 114 Missouri counties that's 34th.
On January 14, 2024 the low fell to about -14°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.
Expect the hardest freezes in January, inside a season that runs November to February. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
Freezing nights typically start around Oct 26 and end around Apr 12.
Audrain gets fewer downpours than most Missouri counties, but they still fill basements. Of roughly 39.3 inches of yearly precipitation, the damage comes from the 7.7 days a year with an inch or more, ranked 112th of 114. June, July and August see the most. The single wettest day in the record: 3.72 inches, April 30, 2017. The worst three-day stretch dropped 5.33 inches, ending June 27, 2021, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 76 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
Missouri's 114 counties range widely in housing age; Audrain ranks 21st, with 65% of its homes built before 1980.
In Audrain County 37% 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.
Here 7% 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
Summer nights that don't drop below 65°F, a good marker of humid air, come about 60 times a year here, close to the Missouri county median of 64.5. 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 Audrain County it's 37% utility gas, 49% electric, 11% propane and 3% 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 Audrain County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Monroe and Randolph get more pipe-freeze nights than Audrain. All of its neighbors see more heavy-rain days. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Audrain | Missouri median | Rank |
|---|---|---|---|
| Homes built before 1960 | 37% | 25% | 17 of 114 |
| Homes built before 1980 | 65% | 53% | 21 of 114 |
| Homes built 2000 or later | 14% | 21% | 97 of 114 |
| Manufactured or mobile homes | 7% | 9.8% | 83 of 114 |
| Vacant homes | 13% | 15% | 77 of 114 |
| Wood or propane heat | 14% | 25% | 93 of 114 |
| Nights at 20°F or colder | 33/yr | 28/yr | 34 of 114 |
| Days with 1 inch+ of rain | 7.7/yr | 10/yr | 112 of 114 |
| Freeze-thaw days | 76/yr | 77/yr | 61 of 114 |
| Muggy nights (65°F+) | 60/yr | 65/yr | 67 of 114 |
Rank 1 is the highest value. Bars run from the lowest to the highest Missouri county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Audrain County: freezing from November to February, 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