Will Pipes Freeze in St. Lawrence County, NY? 86 nights a Year
Freeze nights in St. Lawrence County
In a normal year St. Lawrence County, NY gets 86 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 86% of US counties.
Risk level: Severe. The risk season runs November to April, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 162 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 86 nights |
| Insulated pipe in unheated space | 10°F | 51 nights |
| Inside the heated house | 0°F | 27 nights |
Foam-sleeving a bare pipe in unheated space takes it from 86 nights of risk to 51 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 10/08, last around 05/05. For 20°F: 11/15 to 04/04.
How cold St. Lawrence County nights get
Average winter (Dec-Feb) low: 10°F; the coldest month, January, averages 6°F overnight. 9 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, November, December: 51 nights a year, and 27 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 6°F | 8°F | 18°F | 32°F | 44°F | 54°F | 59°F | 57°F | 48°F | 38°F | 28°F | 16°F |
St. Lawrence County next to its neighbours
Franklin County, NY, 62 km east, gets 107 nights below 20°F to St. Lawrence County's 86 nights. Lewis County, NY, 84 km south, gets 86 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| St. Lawrence County, NY | - | 162 nights | 86 nights | 6°F |
| Franklin County, NY | 62 km east | 196 nights | 107 nights | 3°F |
| Lewis County, NY | 84 km south | 165 nights | 86 nights | 8°F |
| Jefferson County, NY | 95 km southwest | 151 nights | 77 nights | 10°F |
| Hamilton County, NY | 103 km southeast | 188 nights | 102 nights | 6°F |
| Herkimer County, NY | 104 km south | 186 nights | 102 nights | 6°F |
| Essex County, NY | 111 km east | 187 nights | 100 nights | 6°F |
St. Lawrence County within NY
St. Lawrence County ranks 8 of 62 NY counties for nights below 20°F. The most is Franklin County, NY at 107 nights, with a 7°F average winter low. The fewest is Bronx County, NY: 16 nights, winter lows near 30°F. At 739 ft, St. Lawrence County sits 149 ft below the state's median county elevation of 888 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 Colton (2 mi N), NY, 14 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.