Ice dam risk in San Jose, CA
Ice dams in San Jose, CA: how often
0.0 dam days a winter
Almost never. An ordinary house in San Jose sees 0.0 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
San Jose averages 0 inches of snow a year and about 0 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 San Jose?
- 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.
San Jose next to nearby towns
San Jose ranks 8 of 376 California cities here for ice-dam days, behind Truckee at 36.3 days.
- Campbell, CA 8 mi, 0.0 days
- Los Gatos, CA 9 mi, 0.0 days
- Santa Clara, CA 10 mi, 0.0 days
- Milpitas, CA 10 mi, 0.0 days
- Saratoga, CA 12 mi, 0.0 days
Where these numbers come from
NOAA 1991–2020 climate normals from San Jose, 7.5 miles from San Jose. 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.