Will Pipes Freeze in Hunterdon County, NJ? 42 nights a Year
Freeze nights in Hunterdon County
In a normal year Hunterdon County, NJ gets 42 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 58% 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 | 125 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 42 nights |
| Insulated pipe in unheated space | 10°F | 11 nights |
| Inside the heated house | 0°F | 2 nights |
Foam-sleeving a bare pipe in unheated space takes it from 42 nights of risk to 11 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 10/21, last around 04/24. For 20°F: 11/28 to 03/15.
How cold Hunterdon County nights get
Average winter (Dec-Feb) low: 23°F; the coldest month, January, averages 21°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, March, December: 11 nights a year, and 2 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 21°F | 22°F | 29°F | 39°F | 49°F | 58°F | 64°F | 62°F | 54°F | 43°F | 33°F | 26°F |
Hunterdon County next to its neighbours
Warren County, NJ, 33 km north, gets 47 nights below 20°F to Hunterdon County's 42 nights. Bucks County, PA, 30 km southwest, gets 32 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Hunterdon County, NJ | - | 125 nights | 42 nights | 21°F |
| Somerset County, NJ | 25 km east | 129 nights | 43 nights | 20°F |
| Bucks County, PA | 30 km southwest | 106 nights | 32 nights | 23°F |
| Warren County, NJ | 33 km north | 134 nights | 47 nights | 19°F |
| Mercer County, NJ | 36 km southeast | 107 nights | 31 nights | 23°F |
| Northampton County, PA | 39 km northwest | 122 nights | 39 nights | 21°F |
| Morris County, NJ | 45 km northeast | 131 nights | 48 nights | 19°F |
Hunterdon County within NJ
Hunterdon County ranks 6 of 21 NJ counties for nights below 20°F. The most is Sussex County, NJ at 58 nights, with a 20°F average winter low. The fewest is Hudson County, NJ: 20 nights, winter lows near 28°F. At 653 ft, Hunterdon County sits 564 ft above the state's median county elevation of 89 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 Flemington (5 mi NNW), NJ, 3 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.