Will Pipes Freeze in Rockwall County, TX? 4 nights a Year
Freeze nights in Rockwall County
In a normal year Rockwall County, TX gets 4 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 16% of US counties.
Risk level: Occasional. The risk season runs December to February, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 40 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 4 nights |
| Insulated pipe in unheated space | 10°F | under 1 night |
| Inside the heated house | 0°F | none |
Foam-sleeving a bare pipe in unheated space takes it from 4 nights of risk to under 1 night. 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 11/19, last around 03/10. For 20°F: 01/01 to 01/28.
How cold Rockwall County nights get
Average winter (Dec-Feb) low: 37°F; the coldest month, January, averages 35°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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 35°F | 39°F | 47°F | 54°F | 63°F | 71°F | 74°F | 74°F | 66°F | 55°F | 45°F | 37°F |
Rockwall County next to its neighbours
Collin County, TX, 36 km northwest, gets 5 nights below 20°F to Rockwall County's 4 nights. Dallas County, TX, 37 km southwest, gets 2 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Rockwall County, TX | - | 40 nights | 4 nights | 35°F |
| Kaufman County, TX | 35 km south | 45 nights | 4 nights | 34°F |
| Collin County, TX | 36 km northwest | 46 nights | 5 nights | 34°F |
| Dallas County, TX | 37 km southwest | 28 nights | 2 nights | 37°F |
| Hunt County, TX | 39 km northeast | 50 nights | 6 nights | 33°F |
| Rains County, TX | 58 km east | 54 nights | 6 nights | 33°F |
| Van Zandt County, TX | 66 km southeast | 45 nights | 5 nights | 34°F |
Rockwall County within TX
Rockwall County ranks 136 of 254 TX counties for nights below 20°F. The most is Lipscomb County, TX at 57 nights, with a 20°F average winter low. The fewest is Cameron County, TX: none, winter lows near 54°F. At 606 ft, Rockwall County sits 387 ft below the state's median county elevation of 992 ft.
What to do here
- Keep a night-of routine: drip, open cabinets, keep the heat at 55F or above.
- Foam-sleeve any pipe in the garage or crawlspace once; it is cheap and lasts years.
Few hard nights means pipes are rarely built for them; see freezes in warm places.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Lavon Dam, TX, 17 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.