Ice dam risk in College Park, MD
Will your roof get ice dams in College Park, MD?
2.9 dam days a winter
Low risk. On an ordinary house in College Park, conditions for an ice dam come on about 2.9 days in a normal winter, mostly in February and January.
College Park averages 16 inches of snow a year and about 14 days with snow on the ground. Most of it comes and goes within a few days. The conditions that make a dam need all three at once: snow, cold at the eave and heat above it.
What your attic does to that number in College Park
| Attic | Dam days | Risk |
|---|---|---|
| Air-sealed and well insulated | 2.3 | Low |
| Typical, some insulation, not air-sealed | 2.9 | Low |
| Older or poorly insulated, warm attic | 3.7 | Low |
The attic matters less in College Park than in colder towns: there are only 0.6 days a winter between a typical attic and a sealed one.
What to do about ice dams in College Park
- Check the gutters before the first snow and clear them, so meltwater has somewhere to go. If you see icicles thicker than a finger along the eave after a storm, that is the early sign to look at the attic.
Snowy places are not always the worst: why snowfall misleads.
College Park winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 5.7 | 4.5 | 1.1 |
| February | 5.0 | 5.5 | 1.2 |
| March | 2.5 | 2.2 | 0.3 |
| April | 0.1 | 0.0 | 0.0 |
| November | 0.2 | 0.1 | 0.0 |
| December | 2.3 | 2.1 | 0.4 |
College Park next to nearby towns
College Park ranks 12 of 23 Maryland cities here for ice-dam days, behind Hagerstown at 12.1 days.
- Hyattsville, MD 3 mi, 2.1 days
- Greenbelt, MD 3 mi, 2.9 days
- Takoma Park, MD 4 mi, 2.1 days
- New Carrollton, MD 4 mi, 2.9 days
- Washington, DC 8 mi, 2.1 days
Where these numbers come from
NOAA 1991–2020 climate normals from Beltsville, 2.4 miles from College Park. 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.