Ice dam risk in Decatur, AL
Ice dams in Decatur, AL: how often
0.1 dam days a winter
Almost never. An ordinary house in Decatur sees 0.1 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
Decatur averages 1 inch of snow a year and about 1 day 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 Decatur?
- 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.
Decatur winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 0.2 | 0.1 | 0.0 |
| February | 0.5 | 0.3 | 0.0 |
| March | 0.3 | 0.0 | 0.0 |
| December | 0.1 | 0.2 | 0.0 |
Decatur next to nearby towns
Decatur ranks 5 of 66 Alabama cities here for ice-dam days, behind Fort Payne at 0.3 days.
- Hartselle, AL 10 mi, 0.2 days
- Athens, AL 14 mi, 0.0 days
- Madison, AL 16 mi, 0.2 days
- Huntsville, AL 20 mi, 0.2 days
- Cullman, AL 29 mi, 0.1 days
Where these numbers come from
NOAA 1991–2020 climate normals from Belle Mina 2 N, 10.1 miles from Decatur. 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.