Will Pipes Freeze in Walla Walla County, WA? 14 nights a Year
Freeze nights in Walla Walla County
In a normal year Walla Walla County, WA gets 14 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 31% of US counties.
Risk level: Regular. The risk season runs November to March, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 83 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 14 nights |
| Insulated pipe in unheated space | 10°F | 4 nights |
| Inside the heated house | 0°F | under 1 night |
Foam-sleeving a bare pipe in unheated space takes it from 14 nights of risk to 4 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 10/31, last around 03/27. For 20°F: 12/08 to 02/01.
How cold Walla Walla County nights get
Average winter (Dec-Feb) low: 30°F; the coldest month, December, averages 30°F overnight. 8 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, December: 4 nights a year, and under 1 night below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30°F | 32°F | 37°F | 42°F | 48°F | 54°F | 61°F | 60°F | 52°F | 42°F | 35°F | 30°F |
Walla Walla County next to its neighbours
Columbia County, WA, 44 km east, gets 20 nights below 20°F to Walla Walla County's 14 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Walla Walla County, WA | - | 83 nights | 14 nights | 30°F |
| Columbia County, WA | 44 km east | 111 nights | 20 nights | 27°F |
| Franklin County, WA | 45 km northwest | 115 nights | 19 nights | 26°F |
| Garfield County, WA | 75 km east | 125 nights | 25 nights | 27°F |
| Umatilla County, OR | 76 km south | 103 nights | 18 nights | 28°F |
| Benton County, WA | 80 km west | 103 nights | 19 nights | 27°F |
| Adams County, WA | 84 km north | 127 nights | 25 nights | 26°F |
Walla Walla County within WA
Walla Walla County ranks 21 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 1,138 ft, Walla Walla County sits 481 ft below the state's median county elevation of 1,620 ft.
What to do here
- Insulate every pipe in unheated space before the season starts.
- Heat tape on the runs you cannot insulate well.
- Shut off and drain outdoor spigots for the season.
Why 20°F is the line for a garage pipe: how cold before pipes freeze.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Walla Walla Regional Airport, WA, 23 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. How a county figure is built from stations: how the numbers are made.