Will Pipes Freeze in Mahnomen County, MN? 118 nights a Year
Freeze nights in Mahnomen County
In a normal year Mahnomen County, MN gets 118 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 97% of US counties.
Risk level: Severe. The risk season runs October to April, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 187 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 118 nights |
| Insulated pipe in unheated space | 10°F | 77 nights |
| Inside the heated house | 0°F | 50 nights |
Foam-sleeving a bare pipe in unheated space takes it from 118 nights of risk to 77 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 09/28, last around 05/07. For 20°F: 11/01 to 04/10.
How cold Mahnomen County nights get
Average winter (Dec-Feb) low: 1°F; the coldest month, January, averages -3°F overnight. 9 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, April, November, December: 77 nights a year, and 50 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -3°F | 1°F | 15°F | 30°F | 43°F | 53°F | 57°F | 55°F | 46°F | 34°F | 19°F | 5°F |
Mahnomen County next to its neighbours
Clearwater County, MN, 43 km northeast, gets 124 nights below 20°F to Mahnomen County's 118 nights. Becker County, MN, 44 km south, gets 116 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Mahnomen County, MN | - | 187 nights | 118 nights | -3°F |
| Clearwater County, MN | 43 km northeast | 194 nights | 124 nights | -4°F |
| Becker County, MN | 44 km south | 180 nights | 116 nights | -3°F |
| Norman County, MN | 49 km west | 180 nights | 113 nights | -4°F |
| Red Lake County, MN | 63 km north | 182 nights | 117 nights | -3°F |
| Polk County, MN | 66 km northwest | 183 nights | 118 nights | -3°F |
| Clay County, MN | 70 km southwest | 175 nights | 110 nights | -1°F |
Mahnomen County within MN
Mahnomen County ranks 11 of 87 MN counties for nights below 20°F. The most is St. Louis County, MN at 130 nights, with a 0°F average winter low. The fewest is Winona County, MN: 81 nights, winter lows near 12°F. At 1,275 ft, Mahnomen County sits 161 ft above the state's median county elevation of 1,114 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.
The dates to be done by: when freeze season starts and ends.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Mahnomen, MN, 12 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. What a "fair" or "distant" station match means is in the method guide.