Ice dam risk in Middletown, DE
Will your roof get ice dams in Middletown, DE?
3.5 dam days a winter
Low risk. On an ordinary house in Middletown, conditions for an ice dam come on about 3.5 days in a normal winter, mostly in February and January.
Middletown averages 20 inches of snow a year and about 17 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 Middletown
| Attic | Dam days | Risk |
|---|---|---|
| Air-sealed and well insulated | 2.6 | Low |
| Typical, some insulation, not air-sealed | 3.5 | Low |
| Older or poorly insulated, warm attic | 4.6 | Low |
The attic matters less in Middletown than in colder towns: there are only 0.9 days a winter between a typical attic and a sealed one.
What to do about ice dams in Middletown
- 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.
Middletown winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 6.1 | 5.4 | 1.3 |
| February | 7.8 | 6.8 | 1.5 |
| March | 3.1 | 2.6 | 0.3 |
| April | 0.1 | 0.0 | 0.0 |
| November | 0.2 | 0.0 | 0.0 |
| December | 2.9 | 2.1 | 0.4 |
Middletown next to nearby towns
Middletown ranks 3 of 6 Delaware cities here for ice-dam days, behind Wilmington at 3.6 days.
- Smyrna, DE 12 mi, 1.7 days
- Elkton, MD 13 mi, 3.5 days
- Newark, DE 16 mi, 3.5 days
- Dover, DE 22 mi, 1.7 days
- Havre de Grace, MD 22 mi, 3.4 days
Where these numbers come from
NOAA 1991–2020 climate normals from Wilmington NEW Castle County Airport, 17.0 miles from Middletown. 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.