Simpson County, MS Roof Snow Load - 5 psf

Simpson County, MS: your roof's ASCE 7 snow number, in plain English

In depth, not weight: that's roughly 11 inches of fresh, light snow, 4 inches of old, settled snow, or as little as 1 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. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.

Simpson County in numbers

• Design roof snow load5 psf
• Ground snow load, ASCE 7 map5 psf
• National rank#2,256 of 2,758
• Mississippi rank#50 of 82
• Population25,597
• Annual snowfall, NOAA normal0.7 in.
• FIPS28127

Simpson County by the numbers

Nationally that's #2,256 out of 2,758 rated counties, the top 82%; within Mississippi alone, Simpson County ranks #50 of 82. That's 1.5 psf below Mississippi's own county-average design load of 6.5 psf.

Simpson County, FIPS 28127, is home to 25,597 people near 31.9025°N 89.9177°W. Its 5 psf ground snow load figure is the map value; 5 psf is what a roof is actually designed for.

Simpson County's snowfall, most winters

0.7 in. a year: that's Simpson County's NOAA 1991-2020 snowfall normal, measured at D'LO 2 SW, MS US (3.7 mi away). See the density guide.

Before you rely on Simpson County's number

Treat the Simpson 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. See the methodology guide.