Will Pipes Freeze in Wapello County, IA? 59 nights a Year
Freeze nights in Wapello County
In a normal year Wapello County, IA gets 59 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 71% 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 | 131 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 59 nights |
| Insulated pipe in unheated space | 10°F | 28 nights |
| Inside the heated house | 0°F | 11 nights |
Foam-sleeving a bare pipe in unheated space takes it from 59 nights of risk to 28 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 10/14, last around 04/23. For 20°F: 11/11 to 03/23.
How cold Wapello County nights get
Average winter (Dec-Feb) low: 17°F; the coldest month, January, averages 14°F overnight. 7 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, November, December: 28 nights a year, and 11 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 14°F | 18°F | 29°F | 39°F | 51°F | 61°F | 65°F | 62°F | 53°F | 42°F | 30°F | 20°F |
Wapello County next to its neighbours
Mahaska County, IA, 38 km northwest, gets 70 nights below 20°F to Wapello County's 59 nights. Davis County, IA, 31 km south, gets 59 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Wapello County, IA | - | 131 nights | 59 nights | 14°F |
| Davis County, IA | 31 km south | 128 nights | 59 nights | 15°F |
| Jefferson County, IA | 37 km east | 127 nights | 54 nights | 14°F |
| Mahaska County, IA | 38 km northwest | 143 nights | 70 nights | 12°F |
| Monroe County, IA | 39 km west | 135 nights | 63 nights | 13°F |
| Keokuk County, IA | 39 km northeast | 142 nights | 69 nights | 12°F |
| Van Buren County, IA | 49 km southeast | 128 nights | 55 nights | 14°F |
Wapello County within IA
Wapello County ranks 91 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 823 ft, Wapello County sits 266 ft below 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.
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 Ottumwa Industrial Airport, IA, 9 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.