Los Angeles County, California
Gutter cleaning, repair and new gutters in San Dimas, CA
Rain in San Dimas adds up to about 14 inches in a normal year, with about 6 days that bring an inch or more. The wettest season is winter (December to February), with about 9.3 inches; the driest is summer (June to August), with 0.1. Off a 1,000-square-foot roof, that comes to about 9,000 gallons a year for the gutters to carry.
Call (866) 228-6229 free call to a gutter contractor serving San DimasSan Dimas: rain and roofs
NOAA station USC00047050, 3 miBars to one scale; the longest is winter (December to February).
By heavy-rain days, San Dimas falls near the middle of the 939 places in California on this site (6.3 a year). Its housing ranks near the middle of the 938 places in California on this site (half built by 1976).
When to clean gutters in San Dimas
Frost is rare in San Dimas, and in many years there is none (NOAA normals). With no hard freeze to strip the trees, the fall cleaning follows the leaf drop itself; book it once the trees over the roof are bare, and plan a second visit in spring.
When to clean gutters explains how the trees over a roof change the schedule.
Gutter and downspout size for San Dimas rain
Gutters are sized for the worst few minutes of a storm, not for the year. In San Dimas the five-minute rain expected about once in ten years falls at 3.46 inches an hour (NOAA Atlas 14 Volume 6). At that rate one 2-by-3-inch downspout drains about 2,080 square feet of roof and one 3-by-4-inch downspout about 4,160, by the rule in the Copper Development Association’s design handbook. Try your own roof in the gutter and downspout calculator, which starts from this figure.
San Dimas is dry by national standards, about 14 inches in a normal year, but much of the rain that does come can arrive in short, hard storms: the five-minute downpour expected once in ten years still runs at 3.46 inches an hour. Where gutters are used here, the job is moving that burst away from the foundation, and keeping a dry season’s dust and debris from blocking the first storm.
The houses in San Dimas
Half the homes in San Dimas were built by 1976, 64% before 1980 (ACS 2020–2024). At that age a gutter has seen decades of leaves and storms, and the fascia it hangs from has too. On a house built before 1978, replacing more than 20 square feet of painted fascia or trim falls under the EPA’s lead-safe rule, so ask whether the crew is certified.
71% of households own their home, and 61% of homes are detached houses, 11% townhouses. Where an HOA governs the exterior, its rules on gutter color and style apply before any order is placed.
Hiring in California
Before hiring in San Dimas, ask which California license or registration the contractor holds and for a certificate of liability insurance. Hiring a gutter contractor
In California’s fire hazard severity zones, the 2025 Wildland-Urban Interface Code (in force January 1, 2026) requires gutters and downspouts of noncombustible material, and gutters fitted with an approved means to keep leaves and debris from collecting (section 504.4). (2025 California Wildland-Urban Interface Code, Chapter 5 (UpCodes))
Gutter work in San Dimas
With half the homes built by 1976, replacement gutters and the fascia behind them come up more often here than in newer suburbs. The line takes all of it: