McClain County, OK Roof Snow Load - 10 psf
McClain County, OK: your roof's ASCE 7 snow number, in plain English
McClain County's roofs are built to hold 10 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 10 psf - higher than the 7 psf the ground-load formula alone would give, and the code says use the larger one.
In depth, not weight: that's roughly 22 inches of fresh, light snow, 8 inches of old, settled snow, or as little as 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. A modest addition to standard roof loading. Ordinary residential construction handles this without extra bracing.
McClain County, OK: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,785 of 2,758
- Oklahoma rank#35 of 77
- Population48,434
- Annual snowfall, NOAA normal4.1 in.
- FIPS40087
McClain County by the numbers
Nationally that's #1,785 out of 2,758 rated counties, the top 65%; within Oklahoma alone, McClain County ranks #35 of 77. Oklahoma counties average 11 psf; McClain County runs 1 psf lower than that.
McClain County, FIPS 40087, is home to 48,434 people near 35.0164°N 97.4498°W. Its 10 psf ground snow load figure is the map value; 10 psf is what a roof is actually designed for.
McClain County's snowfall, most winters
4.1 in. a year: that's McClain County's NOAA 1991-2020 snowfall normal, measured at NORMAN 3SSE, OK US (11.4 mi away). See the density guide.
Before you rely on McClain County's number
Treat the McClain 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. (How this figure is calculated.)