Knox County, ME Roof Snow Load - 35 psf
What ASCE 7 says about snow load in Knox County
That's Knox 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 77 in. of fresh powder, 28 in. once it settles and packs down, or just 7 in. if it's turned to ice. This is a serious structural load - older homes built before modern snow-load provisions, or ones with low-slope or flat roof sections, are worth having checked.
Knox County at a glance
- Design roof snow load35 psf
- Ground snow load, ASCE 7 map50 psf
- National rank#131 of 2,758
- Maine rank#10 of 12
- Population40,981
- Annual snowfall, NOAA normal53.1 in.
- FIPS23013
Where Knox County's figure sits nationally
Out of 2,758 rated US counties, Knox County sits at #131, the top 5% nationally - #10 of 12 within Maine. Maine counties average 47.8 psf; Knox County runs 12.8 psf lower than that.
Near 44.042°N 69.0385°W, FIPS 23013: Knox County counts 40,981 residents and a 50 psf map value, which the code's own factors turn into 35 psf.
How much it actually snows in Knox County
Most winters bring Knox County roughly 53.1 in. of snow - NOAA's normal at TENANTS HARBOR, ME US, 9.5 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Knox 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 Knox County's county-wide figure. Details: the calculation guide.