Nassau County, NY Roof Snow Load - 21 psf
What ASCE 7 says about snow load in Nassau County
That's Nassau County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from.
Converted to something you can actually eyeball on a roof: about 46.2 in. of fresh powder, 16.8 in. once it settles and packs down, or just 4.2 in. if it's turned to ice. Modern-code homes carry a load like this without issue; an older addition, a carport, or any flat-roofed section is where it is worth checking first.
Nassau County at a glance
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#379 of 2,758
- New York rank#19 of 28
- Population1,392,438
- Annual snowfall, NOAA normal18.5 in.
- FIPS36059
Where Nassau County's figure sits nationally
Out of 2,758 rated US counties, Nassau County sits at #379, the top 14% nationally - #19 of 28 within New York. That's 4.4 psf below New York's own county-average design load of 25.4 psf.
Near 40.7296°N 73.5894°W, FIPS 36059: Nassau County counts 1,392,438 residents and a 30 psf map value, which the code's own factors turn into 21 psf.
How much it actually snows in Nassau County
Most winters bring Nassau County roughly 18.5 in. of snow - NOAA's normal at MINEOLA, NY US, 1.5 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Nassau County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Nassau County's county-wide figure. (How this figure is calculated.)