Will Pipes Freeze in Sioux County, IA? 83 nights a Year
Freeze nights in Sioux County
In a normal year Sioux County, IA gets 83 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 84% 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 | 155 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 83 nights |
| Insulated pipe in unheated space | 10°F | 44 nights |
| Inside the heated house | 0°F | 21 nights |
Foam-sleeving a bare pipe in unheated space takes it from 83 nights of risk to 44 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 10/03, last around 04/30. For 20°F: 11/02 to 04/02.
How cold Sioux County nights get
Average winter (Dec-Feb) low: 12°F; the coldest month, January, averages 9°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, November, December: 44 nights a year, and 21 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 9°F | 14°F | 25°F | 36°F | 48°F | 59°F | 62°F | 59°F | 51°F | 38°F | 25°F | 14°F |
Sioux County next to its neighbours
Lyon County, IA, 34 km north, gets 96 nights below 20°F to Sioux County's 83 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Sioux County, IA | - | 155 nights | 83 nights | 9°F |
| Lyon County, IA | 34 km north | 168 nights | 96 nights | 6°F |
| Plymouth County, IA | 38 km south | 161 nights | 88 nights | 8°F |
| O'Brien County, IA | 45 km east | 153 nights | 83 nights | 9°F |
| Union County, SD | 48 km southwest | 161 nights | 87 nights | 8°F |
| Lincoln County, SD | 49 km northwest | 160 nights | 89 nights | 6°F |
| Osceola County, IA | 55 km northeast | 171 nights | 99 nights | 5°F |
Sioux County within IA
Sioux County ranks 29 of 99 IA counties for nights below 20°F. The most is Osceola County, IA at 99 nights, with a 8°F average winter low. The fewest is Des Moines County, IA: 52 nights, winter lows near 19°F. At 1,442 ft, Sioux County sits 352 ft above the state's median county elevation of 1,090 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.
At this many nights, foam alone is not the answer: insulate or heat tape?.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Sioux Ctr (2 mi SE), IA, 4 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.