Will Pipes Freeze in Bexar County, TX? under 1 night a Year
Freeze nights in Bexar County
In a normal year Bexar County, TX 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 4% of US counties.
Risk level: Rare.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 19 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 |
Month by month
Nights at or below 20°F in a normal year.
First 32°F night is usually around 11/28, last around 02/25. For 20°F: 01/06 to 01/14.
How cold Bexar County nights get
Average winter (Dec-Feb) low: 42°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 | 51°F | 58°F | 66°F | 72°F | 74°F | 74°F | 69°F | 60°F | 49°F | 42°F |
Bexar County next to its neighbours
Comal County, TX, 48 km northeast, gets 1 night below 20°F to Bexar County's under 1 night.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Bexar County, TX | - | 19 nights | under 1 night | 41°F |
| Comal County, TX | 48 km northeast | 23 nights | 1 night | 39°F |
| Wilson County, TX | 52 km southeast | 25 nights | 1 night | 39°F |
| Guadalupe County, TX | 57 km east | 22 nights | under 1 night | 39°F |
| Kendall County, TX | 58 km north | 41 nights | 3 nights | 36°F |
| Medina County, TX | 58 km west | 20 nights | under 1 night | 39°F |
| Atascosa County, TX | 62 km south | 19 nights | under 1 night | 41°F |
Bexar County within TX
Bexar County ranks 216 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 677 ft, Bexar County sits 316 ft below the state's median county elevation of 992 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.
Why rare cold catches people out - freezes 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 San Antonio Incarnate Word, TX, 5 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.