Ontario County, NY Roof Snow Load - 28 psf
Ontario County, NY roof snow load, translated
A typical heated home in Ontario County is designed to carry 28 pounds per square foot of snow on its roof, per ASCE 7-22.
On a roof that means 61.6 in. of fresh snow, 22.4 in. once it packs down, or 5.6 in. of solid ice - three very different piles for the same load. This is a meaningful design load - most modern-code homes handle it fine, though an addition, a carport or a flat-roofed section can be a weak spot.
Snow on Ontario County's roofs right now?
Ontario County in numbers
- Design roof snow load28 psf
- Ground snow load, ASCE 7 map40 psf
- National rank#229 of 2,758
- New York rank#7 of 28
- Population113,012
- Annual snowfall, NOAA normal56.6 in.
- FIPS36069
Where Ontario County ranks
#7 of 28 New York counties by design load, top 8% of 2,758 nationally - that's Ontario County's spot. 25.4 psf is New York's typical county figure - Ontario County beats it by 2.6 psf.
FIPS 36069, population 113,012, centered near 42.8564°N 77.3035°W. ASCE 7's underlying ground snow load here is 40 psf before the code's exposure and importance factors bring it to the 28 psf design figure above.
Ontario County: average annual snowfall
Ontario County sees about 56.6 in. of snow most winters, per the GENEVA RSCH FARM, NY US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Ontario County's figure
The figure above assumes the case ASCE 7-22 treats as typical: a heated, ordinary-occupancy home on a partially exposed site. Change any of those - exposure, heating, roof pitch, occupancy category - and the real design number moves.
A building permit needs the number at your exact address, not the county average - the free ASCE 7 Hazard Tool returns that from your coordinates in about a minute and produces a PDF a plan reviewer will accept. See the methodology guide.