Ice dam risk in Snoqualmie, WA
Ice dams in Snoqualmie, WA: how often
0.2 dam days a winter
Almost never. An ordinary house in Snoqualmie sees 0.2 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
Snoqualmie averages 4 inches of snow a year and about 3 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 Snoqualmie?
- 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.
Snoqualmie winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 1.5 | 1.4 | 0.1 |
| February | 0.2 | 0.2 | 0.0 |
| March | 0.3 | 0.2 | 0.0 |
| November | 0.1 | 0.2 | 0.0 |
| December | 1.5 | 0.7 | 0.1 |
Snoqualmie next to nearby towns
Snoqualmie ranks 62 of 91 Washington cities here for ice-dam days, behind Spokane at 13.0 days.
- Issaquah, WA 8 mi, 0.2 days
- Sammamish, WA 9 mi, 0.2 days
- Newcastle, WA 14 mi, 0.2 days
- Bellevue, WA 14 mi, 0.1 days
- Maple Valley, WA 14 mi, 1.3 days
Where these numbers come from
NOAA 1991–2020 climate normals from Snoqualmie Falls, 1.5 miles from Snoqualmie. 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.
- The nearest weather station sits at a noticeably different elevation from Snoqualmie, so the snow figures may run high or low for the town itself.