Will Pipes Freeze in St. Tammany Parish, LA? under 1 night a Year
Freeze nights in St. Tammany Parish
In a normal year St. Tammany Parish, LA gets under 1 night at or below 20°F, the point where bare pipes in a garage, attic or outside wall start to freeze. That is more than 6% of US counties.
Risk level: Rare. The risk season runs January to January, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 24 nights |
| Bare pipe in garage, attic or outside wall | 20°F | under 1 night |
| Insulated pipe in unheated space | 10°F | none |
| Inside the heated house | 0°F | none |
Foam-sleeving a bare pipe in unheated space takes it from under 1 night of risk to none. 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 11/21, last around 03/03. For 20°F: 01/07 to 01/17.
How cold St. Tammany Parish nights get
Average winter (Dec-Feb) low: 43°F; the coldest month, January, averages 41°F overnight. 5 months normally bring at least one night below 32°F (Jan, Feb, Mar, Nov, Dec).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 41°F | 44°F | 50°F | 56°F | 64°F | 71°F | 73°F | 73°F | 68°F | 58°F | 47°F | 43°F |
St. Tammany Parish next to its neighbours
Washington Parish, LA, 50 km north, gets 2 nights below 20°F to St. Tammany Parish's under 1 night. Orleans Parish, LA, 40 km south, gets under 1 night.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| St. Tammany Parish, LA | - | 24 nights | under 1 night | 41°F |
| Orleans Parish, LA | 40 km south | 4 nights | under 1 night | 46°F |
| Hancock County, MS | 45 km east | 26 nights | 1 night | 40°F |
| Tangipahoa Parish, LA | 49 km northwest | 33 nights | 1 night | 39°F |
| Washington Parish, LA | 50 km north | 31 nights | 2 nights | 38°F |
| Pearl River County, MS | 54 km northeast | 27 nights | 2 nights | 39°F |
| St. John the Baptist Parish, LA | 60 km southwest | 13 nights | under 1 night | 43°F |
St. Tammany Parish within LA
St. Tammany Parish ranks 36 of 64 LA counties for nights below 20°F. The most is Claiborne Parish, LA at 5 nights, with a 34°F average winter low. The fewest is Plaquemines Parish, LA: none, winter lows near 49°F. At 36 ft, St. Tammany Parish sits close to the state's median county elevation of 70 ft.
What to do here
- Watch the forecast for a sub-threshold night.
- That night: drip the faucet on an outside wall, open the sink cabinet.
A few nights a year catches houses that were never built for it: pipes in places that rarely freeze.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Slidell Airport, LA, 15 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.