Will Pipes Freeze in Jefferson County, KS? 47 nights a Year
Freeze nights in Jefferson County
In a normal year Jefferson County, KS gets 47 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 62% of US counties.
Risk level: Severe. 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 | 115 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 47 nights |
| Insulated pipe in unheated space | 10°F | 18 nights |
| Inside the heated house | 0°F | 5 nights |
Foam-sleeving a bare pipe in unheated space takes it from 47 nights of risk to 18 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 10/22, last around 04/16. For 20°F: 11/18 to 03/19.
How cold Jefferson County nights get
Average winter (Dec-Feb) low: 21°F; the coldest month, January, averages 18°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: 18 nights a year, and 5 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 18°F | 22°F | 32°F | 42°F | 54°F | 64°F | 68°F | 66°F | 57°F | 45°F | 32°F | 23°F |
Jefferson County next to its neighbours
Leavenworth County, KS, 30 km east, gets 53 nights below 20°F to Jefferson County's 47 nights. Douglas County, KS, 39 km south, gets 43 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Jefferson County, KS | - | 115 nights | 47 nights | 18°F |
| Leavenworth County, KS | 30 km east | 126 nights | 53 nights | 17°F |
| Atchison County, KS | 33 km north | 116 nights | 47 nights | 17°F |
| Douglas County, KS | 39 km south | 111 nights | 43 nights | 19°F |
| Shawnee County, KS | 39 km southwest | 115 nights | 42 nights | 19°F |
| Jackson County, KS | 41 km northwest | 130 nights | 56 nights | 15°F |
| Wyandotte County, KS | 55 km east | 113 nights | 45 nights | 19°F |
Jefferson County within KS
Jefferson County ranks 63 of 105 KS counties for nights below 20°F. The most is Rawlins County, KS at 83 nights, with a 16°F average winter low. The fewest is Cherokee County, KS: 27 nights, winter lows near 26°F. At 1,097 ft, Jefferson County sits 428 ft below the state's median county elevation of 1,526 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 Oskaloosa (4 mi NE), KS, 9 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. Why elevation is part of the blend: how county numbers are made.