Arenac County, Michigan · Standish
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Arenac County averages 51 nights a year at 20°F or colder, mostly November to March, and 26% of its homes predate 1960.
Heavy rain days of an inch or more come about 3.7 times a year here, most often in October. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Arenac County gets about 3.7 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Arenac County, 2.86 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
46% of occupied homes in Arenac County heat mainly with wood or propane, above the Michigan county median of 29%.
With 15 muggy nights a year, mold in Arenac County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 9,554 homes and around 15,077 residents, Arenac County is 363 square miles of southeast Michigan. Besides Standish, the county seat, the biggest communities are Au Gres, Sterling and Omer. Half the homes here were built before 1977, half after.
42/100 Water Damage Risk Index: Moderate Arenac County ranks 60 of 83 Michigan counties. See the statewide ranking and method.The three factors where Arenac County ranks highest compared with other Michigan counties.
Pipe-freeze risk in Arenac County sits near the middle of the state. From 2015–2024 it averaged 51 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 137 nights at or below 32°F. That ranks 46th of 83 counties.
The longest cold spell was straight 27 days without the temperature rising above freezing, ending in March 2015. The coldest night reached about -22°F on February 20, 2015. Burst pipes usually show up when a spell like that breaks and the ice thaws.
Most freezing nights fall from November to March, peaking in January. Disconnect garden hoses and shut off outdoor spigots before the first hard frost, and keep the heat at 55°F or higher if you'll be away.
Freezing nights typically start around Oct 21 and end around May 2.
Rainfall is about average for Michigan. About 3.7 days a year bring an inch or more (46th of 83), most often in October, out of 32 inches of total precipitation. On May 19, 2020, 2.86 inches fell in a single day. The worst three-day stretch dropped 4.98 inches, ending May 20, 2020, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 90 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
Roughly 57% of the county's housing was built before 1980. That puts Arenac near the middle of Michigan's 83 counties.
Older and newer homes sit side by side here: 26% predate 1960 and 14% are from 2000 or later. Corroded pipe is the typical failure in the first group, burst supply hoses in the second.
29% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
12% of homes are manufactured or mobile homes, above the Michigan county median of 7.3%. 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.
The Census counted 31% of homes as vacant, above the Michigan county median of 19.5%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 15 times a year here, above the Michigan county median of 10. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectBy main heating fuel, Arenac County homes break down as 45% utility gas, 6% electric, 32% propane and 14% wood. Wood and propane heat are more common here than in most Michigan counties. Heating equipment is one of the leading causes of home fires nationally, and the NFPA recommends having chimneys and vents inspected every year.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Arenac County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Gladwin, Iosco and Ogemaw get more pipe-freeze nights than Arenac. It also has the most heavy-rain days in its area. Bay County has the oldest housing nearby, with 75% of homes built before 1980.
By the numbers
| Factor | Arenac | Michigan median | Rank |
|---|---|---|---|
| Homes built before 1960 | 26% | 32% | 57 of 83 |
| Homes built before 1980 | 57% | 58% | 51 of 83 |
| Homes built 2000 or later | 14% | 16% | 55 of 83 |
| Manufactured or mobile homes | 12% | 7.3% | 13 of 83 |
| Vacant homes | 31% | 20% | 29 of 83 |
| Wood or propane heat | 46% | 29% | 17 of 83 |
| Nights at 20°F or colder | 51/yr | 54/yr | 46 of 83 |
| Days with 1 inch+ of rain | 3.7/yr | 3.9/yr | 46 of 83 |
| Freeze-thaw days | 90/yr | 95/yr | 59 of 83 |
| Muggy nights (65°F+) | 15/yr | 10/yr | 34 of 83 |
Rank 1 is the highest value. Bars run from the lowest to the highest Michigan county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Arenac County: freezing from November to March, heavy rain in April, August 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