Will Pipes Freeze in Asotin County, WA? 52 nights a Year
Freeze nights in Asotin County
In a normal year Asotin County, WA gets 52 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 66% of US counties.
Risk level: Severe. The risk season runs October to April, worst in December.
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 | 52 nights |
| Insulated pipe in unheated space | 10°F | 16 nights |
| Inside the heated house | 0°F | 4 nights |
Foam-sleeving a bare pipe in unheated space takes it from 52 nights of risk to 16 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 09/05, last around 06/08. For 20°F: 10/23 to 04/08.
How cold Asotin County nights get
Average winter (Dec-Feb) low: 21°F; the coldest month, December, averages 20°F overnight. 11 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Jun, Aug, 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: 16 nights a year, and 4 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20°F | 22°F | 27°F | 31°F | 37°F | 42°F | 47°F | 46°F | 39°F | 32°F | 26°F | 20°F |
Asotin County next to its neighbours
Wallowa County, OR, 65 km south, gets 65 nights below 20°F to Asotin County's 52 nights. Garfield County, WA, 36 km northwest, gets 25 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Asotin County, WA | - | 179 nights | 52 nights | 20°F |
| Garfield County, WA | 36 km northwest | 125 nights | 25 nights | 27°F |
| Nez Perce County, ID | 40 km northeast | 109 nights | 20 nights | 27°F |
| Columbia County, WA | 54 km west | 111 nights | 20 nights | 27°F |
| Lewis County, ID | 62 km east | 159 nights | 40 nights | 23°F |
| Wallowa County, OR | 65 km south | 190 nights | 65 nights | 19°F |
| Latah County, ID | 80 km northeast | 143 nights | 29 nights | 25°F |
Asotin County within WA
Asotin County ranks 4 of 39 WA counties for nights below 20°F. The most is Ferry County, WA at 62 nights, with a 18°F average winter low. The fewest is Island County, WA: 1 night, winter lows near 37°F. At 3,451 ft, Asotin County sits 1,831 ft above the state's median county elevation of 1,620 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 Enterprise (20 mi NNE), OR, 53 km away (fair 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.