Rockland County, NY Roof Snow Load - 21 psf
Rockland County, NY: your roof's ASCE 7 snow number, in plain English
Rockland County's roofs are built to hold 21 psf of snow, the ASCE 7-22 figure a permit reviewer checks first.
In depth, not weight: that's roughly 46.2 inches of fresh, light snow, 16.8 inches of old, settled snow, or as little as 4.2 inches of solid ice - snow that heavy is rare here but ice from a freeze-thaw cycle adds up far faster than the depth suggests. 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.
Rockland County at a glance
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#397 of 2,758
- New York rank#21 of 28
- Population348,144
- Annual snowfall, NOAA normal39.5 in.
- FIPS36087
Rockland County by the numbers
Nationally that's #397 out of 2,758 rated counties, the top 14%; within New York alone, Rockland County ranks #21 of 28. New York counties average 25.4 psf; Rockland County runs 4.4 psf lower than that.
Rockland County, FIPS 36087, is home to 348,144 people near 41.1546°N 74.0247°W. Its 30 psf ground snow load figure is the map value; 21 psf is what a roof is actually designed for.
Rockland County's snowfall, most winters
39.5 in. a year: that's Rockland County's NOAA 1991-2020 snowfall normal, measured at YORKTOWN HTS 1W, NY US (14.1 mi away). See the density guide.
Before you rely on Rockland County's number
Treat the Rockland County figure as a starting point, not a final answer: it assumes standard occupancy, a heated structure and a moderately sheltered site, per ASCE 7-22's own defaults. Exposed terrain, an unheated building or a steeper roof all shift the real number.
For a real application, skip the county number and go straight to the ASCE 7 Hazard Tool - enter your coordinates and it returns a site-specific figure a plan reviewer will recognize. See the methodology guide.