Butler County, IA Roof Snow Load - 21 psf
What ASCE 7 says about snow load in Butler County
That's Butler 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.
Butler County at a glance
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#466 of 2,758
- Iowa rank#38 of 99
- Population14,156
- Annual snowfall, NOAA normal31.6 in.
- FIPS19023
Where Butler County's figure sits nationally
Out of 2,758 rated US counties, Butler County sits at #466, the top 17% nationally - #38 of 99 within Iowa. 21.7 psf is Iowa's typical county figure - Butler County comes in 0.7 psf under it.
Near 42.7348°N 92.7802°W, FIPS 19023: Butler County counts 14,156 residents and a 30 psf map value, which the code's own factors turn into 21 psf.
How much it actually snows in Butler County
Most winters bring Butler County roughly 31.6 in. of snow - NOAA's normal at PARKERSBURG, IA US, 11 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Butler 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 Butler County's county-wide figure. (How this figure is calculated.)