Ice dam risk in Rancho Cucamonga, CA
How often ice dams form in Rancho Cucamonga
0.0 dam days a winter
Almost never. An ordinary house in Rancho Cucamonga sees 0.0 days a winter when an ice dam can form, because snow rarely stays on a roof long enough below freezing.
Rancho Cucamonga 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 Rancho Cucamonga?
- 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.
Rancho Cucamonga next to nearby towns
Rancho Cucamonga ranks 33 of 376 California cities here for ice-dam days, behind Truckee at 36.3 days.
- Upland, CA 5 mi, 0.0 days
- Fontana, CA 6 mi, 0.0 days
- Ontario, CA 7 mi, 0.0 days
- Claremont, CA 8 mi, 0.0 days
- Montclair, CA 9 mi, 0.0 days
Where these numbers come from
NOAA 1991–2020 climate normals from Pomona/Fairplex, 11.9 miles from Rancho Cucamonga. 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.