Will Pipes Freeze in Sanilac County, MI? 68 nights a Year
Freeze nights in Sanilac County
In a normal year Sanilac County, MI gets 68 nights at or below 20°F, the point where bare pipes in a garage, attic or outside wall start to freeze. That is more than 76% of US counties.
Risk level: Severe. The risk season runs November to April, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 150 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 68 nights |
| Insulated pipe in unheated space | 10°F | 31 nights |
| Inside the heated house | 0°F | 10 nights |
Foam-sleeving a bare pipe in unheated space takes it from 68 nights of risk to 31 nights. A 12 ft heat-tape kit runs $17 to $37; an average burst-pipe repair is about $500.
Month by month
Nights at or below 20°F in a normal year.
First 32°F night is usually around 10/16, last around 05/02. For 20°F: 11/19 to 03/31.
How cold Sanilac County nights get
Average winter (Dec-Feb) low: 17°F; the coldest month, February, averages 14°F overnight. 8 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, December: 31 nights a year, and 10 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 15°F | 14°F | 23°F | 33°F | 45°F | 55°F | 60°F | 58°F | 51°F | 40°F | 30°F | 22°F |
Sanilac County next to its neighbours
Huron County, MI, 54 km north, gets 57 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Sanilac County, MI | - | 150 nights | 68 nights | 15°F |
| Huron County, MI | 54 km north | 139 nights | 57 nights | 17°F |
| St. Clair County, MI | 58 km south | 141 nights | 59 nights | 17°F |
| Lapeer County, MI | 62 km southwest | 145 nights | 62 nights | 15°F |
| Tuscola County, MI | 64 km west | 153 nights | 64 nights | 14°F |
| Macomb County, MI | 89 km south | 130 nights | 52 nights | 18°F |
| Genesee County, MI | 98 km southwest | 147 nights | 62 nights | 16°F |
Sanilac County within MI
Sanilac County ranks 41 of 83 MI counties for nights below 20°F. The most is Iron County, MI at 120 nights, with a 3°F average winter low. The fewest is Allegan County, MI: 38 nights, winter lows near 24°F. At 779 ft, Sanilac County sits close to the state's median county elevation of 808 ft.
What to do here
- Treat it as a building fix, not a night-of routine: insulate, heat tape, seal crawlspace vents.
- An automatic leak shutoff pays for itself if one burst is avoided.
- Know where the main shutoff is before the first hard freeze.
Interior pipes have a threshold too: the four freeze points.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Sandusky, MI, 15 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. How a county figure is built from stations: how the numbers are made.