Ice dam risk in Fontana, CA
How often ice dams form in Fontana
0.0 dam days a winter
Almost never. An ordinary house in Fontana sees 0.0 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
Fontana 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 Fontana?
- 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.
Fontana next to nearby towns
Fontana ranks 25 of 376 California cities here for ice-dam days, behind Truckee at 36.3 days.
- Rialto, CA 4 mi, 0.0 days
- Rancho Cucamonga, CA 6 mi, 0.0 days
- Jurupa Valley, CA 7 mi, 0.0 days
- Colton, CA 9 mi, 0.0 days
- Ontario, CA 10 mi, 0.0 days
Where these numbers come from
NOAA 1991–2020 climate normals from Riverside Citrus Exp, 11.4 miles from Fontana. 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.