Ice dam risk in San Juan, TX
How often ice dams form in San Juan
0.0 dam days a winter
Almost never. An ordinary house in San Juan sees 0.0 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
San Juan 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 Juan?
- 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 Juan winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| December | 0.1 | 0.1 | 0.0 |
San Juan next to nearby towns
San Juan ranks 127 of 252 Texas cities here for ice-dam days, behind Pampa at 2.6 days.
- Alamo, TX 2 mi, 0.0 days
- Pharr, TX 3 mi, 0.0 days
- McAllen, TX 6 mi, 0.0 days
- Donna, TX 7 mi, 0.0 days
- Hidalgo, TX 8 mi, 0.0 days
Where these numbers come from
NOAA 1991–2020 climate normals from Mcallen, 6.1 miles from San Juan. 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.