Watonwan County, Minnesota · St. James
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Watonwan County averages 81 nights a year at 20°F or colder, mostly November to March, and 48% of its homes predate 1960.
Heavy rain days of an inch or more come about 7.3 times a year here, most often in June. A sump pump that hasn't run since last season is a common weak point.
48% 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 Watonwan County, 3.5 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
26% of occupied homes in Watonwan County heat mainly with wood or propane, below the Minnesota county median of 30%.
About 22 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 11,205 people live in Watonwan County, 435 square miles in southern Minnesota, in roughly 4,881 homes. St. James is the county seat; Madelia, Butterfield and Lewisville are the next largest communities. The county's median home was built in 1962.
68/100 Water Damage Risk Index: Elevated Watonwan County ranks 7 of 87 Minnesota counties. See the statewide ranking and method.The three factors where Watonwan County ranks highest compared with other Minnesota counties.
Watonwan County is milder than most of Minnesota, but not mild enough to skip winterizing. It averaged 151 freezing nights a year over 2015–2024, 81 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 87 Minnesota counties that's 61st.
Cold snaps are the real risk. The worst in the record lasted 34 days below freezing (ending March 2019), and the low bottomed out near -27°F on January 31, 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 16 and the last spring freeze around Apr 26.
Heavy rain is a bigger factor here than in most of Minnesota. The county gets about 34.6 inches of rain and melted snow a year, with 7.3 days of an inch or more (13th of 87). Those downpours cluster in May, June and October, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.5 inches on July 17, 2016. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.88 inches (through June 23, 2024).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 86 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 72% of the county's housing was built before 1980. That puts Watonwan among the oldest housing stocks of Minnesota's 87 counties.
48% were built before 1960. Homes from that era often still have galvanized steel supply pipe, which rusts from the inside until it pinholes, and cast iron drains that crack with age. Slow leaks behind walls are a common start to water damage in these houses.
The Census counted 13% of homes as vacant, above the Minnesota county median of 11%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
About 22 nights a year in Watonwan County stay at 65°F or warmer, a sign of muggy summer air (5th of 87 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 expectMain heating fuel in Watonwan County's occupied homes: 53% utility gas, 16% electric, 25% propane and 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 Watonwan County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Cottonwood and Jackson get more pipe-freeze nights than Watonwan. Jackson County has the oldest housing nearby, with 80% of homes built before 1980.
By the numbers
| Factor | Watonwan | Minnesota median | Rank |
|---|---|---|---|
| Homes built before 1960 | 48% | 34% | 18 of 87 |
| Homes built before 1980 | 72% | 58% | 16 of 87 |
| Homes built 2000 or later | 11% | 21% | 75 of 87 |
| Manufactured or mobile homes | 2.8% | 3.8% | 55 of 87 |
| Vacant homes | 13% | 11% | 32 of 87 |
| Wood or propane heat | 26% | 30% | 52 of 87 |
| Nights at 20°F or colder | 81/yr | 89/yr | 61 of 87 |
| Days with 1 inch+ of rain | 7.3/yr | 5.3/yr | 13 of 87 |
| Freeze-thaw days | 86/yr | 86/yr | 44 of 87 |
| Muggy nights (65°F+) | 22/yr | 13/yr | 5 of 87 |
Rank 1 is the highest value. Bars run from the lowest to the highest Minnesota county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Watonwan County: freezing from November to March, heavy rain in May, June and October.
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