Calloway County, KY Roof Snow Load - 15 psf
What ASCE 7 says about snow load in Calloway County
That's Calloway County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. The physics-based figure alone would be 10.5 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 15 psf for flat and low-pitch roofs here, which is the number that actually governs.
Converted to something you can actually eyeball on a roof: about 33 in. of fresh powder, 12 in. once it settles and packs down, or just 3 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.
Calloway County at a glance
- Design roof snow load15 psf
- Ground snow load, ASCE 7 map15 psf
- National rank#1,401 of 2,758
- Kentucky rank#37 of 120
- Population38,975
- Annual snowfall, NOAA normal6.5 in.
- FIPS21035
Where Calloway County's figure sits nationally
Out of 2,758 rated US counties, Calloway County sits at #1,401, the top 51% nationally - #37 of 120 within Kentucky. Kentucky counties average 15.7 psf; Calloway County runs 0.7 psf lower than that.
Near 36.621°N 88.2741°W, FIPS 21035: Calloway County counts 38,975 residents and a 15 psf map value, which the code's own factors turn into 15 psf.
How much it actually snows in Calloway County
Most winters bring Calloway County roughly 6.5 in. of snow - NOAA's normal at MURRAY, KY US, 2 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Calloway 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 Calloway County's county-wide figure. See the methodology guide.