Ice dam risk in Aurora, OH
Ice dams in Aurora, OH: how often
20.9 dam days a winter
High risk. On an ordinary house in Aurora, conditions for an ice dam come on about 20.9 days in a normal winter, mostly in January and February.
Aurora averages 63 inches of snow a year and about 67 days with snow on the ground. Snow that lies that long is what turns a little attic heat into a ridge of ice at the eave. 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 Aurora
| Attic | Dam days | Risk |
|---|---|---|
| Air-sealed and well insulated | 10.4 | Moderate |
| Typical, some insulation, not air-sealed | 20.9 | High |
| Older or poorly insulated, warm attic | 34.0 | High |
Sealing and insulating a typical attic takes out about 10.5 days a winter here. It drops the risk from high to moderate. An older house with a warm attic should expect closer to 34.0 days.
What to do about ice dams in Aurora
- Air-seal the attic floor: the gaps around the hatch, light fixtures, plumbing stacks and the top plates of interior walls. This is the fix that removes the cause, and it usually costs less than a season of contractor ice removal.
- Rake the bottom three or four feet of roof after any storm that leaves more than about six inches, from the ground with a roof rake.
- At the next reroof, ask for ice-and-water membrane under the shingles from the eave to at least 24 inches inside the wall line. It does not stop a dam; it stops the leak when one forms.
Which to spend on first: air sealing or heat cable.
Aurora winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 20.4 | 21.3 | 7.7 |
| February | 12.5 | 18.2 | 6.2 |
| March | 9.9 | 9.4 | 2.2 |
| April | 0.7 | 0.9 | 0.1 |
| October | 0.3 | 0.2 | 0.0 |
| November | 5.3 | 3.4 | 0.6 |
| December | 13.8 | 13.6 | 4.1 |
Aurora next to nearby towns
Aurora ranks 15 of 176 Ohio cities here for ice-dam days, behind Euclid at 24.8 days.
- Streetsboro, OH 4 mi, 14.9 days
- Twinsburg, OH 6 mi, 14.9 days
- Hudson, OH 7 mi, 14.9 days
- Solon, OH 8 mi, 20.9 days
- Macedonia, OH 9 mi, 14.9 days
Where these numbers come from
NOAA 1991–2020 climate normals from Hiram, 9.6 miles from Aurora. 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.