Harmon County, OK Roof Snow Load - 10 psf
Harmon County, OK: your roof's ASCE 7 snow number, in plain English
Harmon County's roofs are built to hold 10 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. Flat and low-pitch roofs in Harmon County are actually governed by ASCE 7's §7.3.4 minimum of 10 psf, not the 7 psf the ground-load formula alone would produce.
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. Standard residential construction handles a load this size without extra bracing; it is a modest addition on top of ordinary roof loading.
Harmon County, OK: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#2,057 of 2,758
- Oklahoma rank#71 of 77
- Population2,315
- Annual snowfall, NOAA normal3.3 in.
- FIPS40057
Harmon County by the numbers
Nationally that's #2,057 out of 2,758 rated counties, the top 75%; within Oklahoma alone, Harmon County ranks #71 of 77. That's 1 psf below Oklahoma's own county-average design load of 11 psf.
Harmon County, FIPS 40057, is home to 2,315 people near 34.746°N 99.8442°W. Its 10 psf ground snow load figure is the map value; 10 psf is what a roof is actually designed for.
Harmon County's snowfall, most winters
3.3 in. a year: that's Harmon County's NOAA 1991-2020 snowfall normal, measured at HOLLIS 5E, OK US (4.8 mi away). See the density guide.
Before you rely on Harmon County's number
Treat the Harmon 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. Details: the calculation guide.