Ice dam risk in Irmo, SC
Ice dams in Irmo, SC: how often
0.0 dam days a winter
Almost never. An ordinary house in Irmo sees 0.0 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
Irmo averages 1 inch 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 Irmo?
- 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.
Irmo winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 0.8 | 0.1 | 0.0 |
Irmo next to nearby towns
Irmo ranks 41 of 42 South Carolina cities here for ice-dam days, behind Greenville at 0.3 days.
- Lexington, SC 8 mi, 0.1 days
- West Columbia, SC 10 mi, 0.1 days
- Forest Acres, SC 14 mi, 0.0 days
- Cayce, SC 14 mi, 0.0 days
- Columbia, SC 17 mi, 0.0 days
Where these numbers come from
NOAA 1991–2020 climate normals from Cedar Creek 2E, 10.5 miles from Irmo. 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.