Will Pipes Freeze in Warren County, NJ? 47 nights a Year
Freeze nights in Warren County
In a normal year Warren County, NJ 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 | 134 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 47 nights |
| Insulated pipe in unheated space | 10°F | 14 nights |
| Inside the heated house | 0°F | 2 nights |
Foam-sleeving a bare pipe in unheated space takes it from 47 nights of risk to 14 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 10/18, last around 04/30. For 20°F: 11/20 to 03/22.
How cold Warren County nights get
Average winter (Dec-Feb) low: 21°F; the coldest month, January, averages 19°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: 14 nights a year, and 2 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 19°F | 19°F | 27°F | 37°F | 47°F | 56°F | 61°F | 60°F | 52°F | 41°F | 31°F | 24°F |
Warren County next to its neighbours
Monroe County, PA, 35 km northwest, gets 59 nights below 20°F to Warren County's 47 nights. Northampton County, PA, 27 km southwest, gets 39 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Warren County, NJ | - | 134 nights | 47 nights | 19°F |
| Northampton County, PA | 27 km southwest | 122 nights | 39 nights | 21°F |
| Hunterdon County, NJ | 33 km south | 125 nights | 42 nights | 21°F |
| Monroe County, PA | 35 km northwest | 146 nights | 59 nights | 17°F |
| Morris County, NJ | 39 km east | 131 nights | 48 nights | 19°F |
| Sussex County, NJ | 41 km northeast | 142 nights | 58 nights | 17°F |
| Somerset County, NJ | 46 km southeast | 129 nights | 43 nights | 20°F |
Warren County within NJ
Warren County ranks 3 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 1,012 ft, Warren County sits 923 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.
Interior pipes have a threshold too: the four freeze points.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Belvidere Brg, NJ, 7 km away (fair 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.