Ice dam risk in San Antonio, TX
Will your roof get ice dams in San Antonio, TX?
0.0 dam days a winter
Almost never. An ordinary house in San Antonio sees 0.0 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
San Antonio averages 0 inches of snow a year and about 0 days with snow on the ground. Too little lies on the roof for long. The conditions that make a dam need all three at once: snow, cold at the eave and heat above it.
Do you need to do anything in San Antonio?
- Nothing for ice dams. If you are buying here and an inspector mentions water at the eaves, ask what they saw: it is far more likely a gutter, flashing or drip-edge problem than ice.
Snowy places are not always the worst: why snowfall misleads.
San Antonio winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| December | 0.1 | 0.1 | 0.0 |
San Antonio next to nearby towns
San Antonio ranks 41 of 252 Texas cities here for ice-dam days, behind Pampa at 2.6 days.
- Leon Valley, TX 6 mi, 0.0 days
- Helotes, TX 12 mi, 0.0 days
- Live Oak, TX 13 mi, 0.0 days
- Converse, TX 14 mi, 0.0 days
- Universal City, TX 14 mi, 0.0 days
Where these numbers come from
NOAA 1991–2020 climate normals from San Antonio Incarnate Word, 3.2 miles from San Antonio. A dam day is a day with snow on the roof and freezing at the eave while heat or sun melts the snow above it. This describes a normal winter, not this one.