Will Pipes Freeze in Montgomery County, PA? 47 nights a Year
Freeze nights in Montgomery County
In a normal year Montgomery County, PA 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 | 130 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 47 nights |
| Insulated pipe in unheated space | 10°F | 13 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 13 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 10/15, last around 04/24. For 20°F: 11/24 to 03/18.
How cold Montgomery 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: 13 nights a year, and 2 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 21°F | 23°F | 30°F | 40°F | 50°F | 60°F | 65°F | 62°F | 54°F | 42°F | 33°F | 26°F |
Montgomery County next to its neighbours
Bucks County, PA, 26 km northeast, gets 32 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Montgomery County, PA | - | 130 nights | 47 nights | 21°F |
| Bucks County, PA | 26 km northeast | 106 nights | 32 nights | 23°F |
| Philadelphia County, PA | 30 km southeast | 77 nights | 18 nights | 27°F |
| Delaware County, PA | 33 km south | 74 nights | 15 nights | 26°F |
| Chester County, PA | 42 km southwest | 119 nights | 39 nights | 22°F |
| Lehigh County, PA | 49 km north | 127 nights | 44 nights | 20°F |
| Berks County, PA | 52 km northwest | 107 nights | 33 nights | 23°F |
Montgomery County within PA
Montgomery County ranks 41 of 67 PA counties for nights below 20°F. The most is Susquehanna County, PA at 80 nights, with a 15°F average winter low. The fewest is Delaware County, PA: 15 nights, winter lows near 28°F. At 204 ft, Montgomery County sits 937 ft below the state's median county elevation of 1,141 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 Graterford (1 mi E), PA, 5 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.