Will Pipes Freeze in McPherson County, SD? 111 nights a Year
Freeze nights in McPherson County
In a normal year McPherson County, SD gets 111 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 96% 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 | 179 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 111 nights |
| Insulated pipe in unheated space | 10°F | 67 nights |
| Inside the heated house | 0°F | 38 nights |
Foam-sleeving a bare pipe in unheated space takes it from 111 nights of risk to 67 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 09/30, last around 05/10. For 20°F: 10/28 to 04/10.
How cold McPherson County nights get
Average winter (Dec-Feb) low: 6°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: 67 nights a year, and 38 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3°F | 6°F | 18°F | 31°F | 43°F | 53°F | 58°F | 56°F | 47°F | 33°F | 20°F | 9°F |
McPherson County next to its neighbours
McIntosh County, ND, 39 km northwest, gets 116 nights below 20°F to McPherson County's 111 nights. Campbell County, SD, 61 km west, gets 107 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| McPherson County, SD | - | 179 nights | 111 nights | 3°F |
| McIntosh County, ND | 39 km northwest | 185 nights | 116 nights | 1°F |
| Edmunds County, SD | 41 km south | 181 nights | 111 nights | 3°F |
| Campbell County, SD | 61 km west | 178 nights | 107 nights | 3°F |
| Dickey County, ND | 66 km northeast | 178 nights | 109 nights | 2°F |
| Brown County, SD | 70 km east | 179 nights | 112 nights | 1°F |
| Walworth County, SD | 75 km southwest | 178 nights | 105 nights | 4°F |
McPherson County within SD
McPherson County ranks 5 of 66 SD counties for nights below 20°F. The most is Codington County, SD at 113 nights, with a 6°F average winter low. The fewest is Tripp County, SD: 75 nights, winter lows near 15°F. At 1,974 ft, McPherson County sits 189 ft above the state's median county elevation of 1,785 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 Aberdeen (35 mi WNW), SD, 10 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.