Greene County, IN Roof Snow Load - 20 psf
Greene County, IN: your roof's ASCE 7 snow number, in plain English
Greene County's roofs are built to hold 20 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. The physics-based figure alone would be 14 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 20 psf for flat and low-pitch roofs here, which is the number that actually governs.
In depth, not weight: that's roughly 44 inches of fresh, light snow, 16 inches of old, settled snow, or as little as 4 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 meaningful design load - most modern-code homes handle it fine, though an addition, a carport or a flat-roofed section can be a weak spot.
Greene County at a glance
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#853 of 2,758
- Indiana rank#43 of 89
- Population31,219
- Annual snowfall, NOAA normal8.9 in.
- FIPS18055
Greene County by the numbers
Nationally that's #853 out of 2,758 rated counties, the top 31%; within Indiana alone, Greene County ranks #43 of 89. Indiana counties average 19.3 psf; Greene County runs 0.7 psf higher than that.
Greene County, FIPS 18055, is home to 31,219 people near 39.0471°N 87.0048°W. Its 20 psf ground snow load figure is the map value; 20 psf is what a roof is actually designed for.
Greene County's snowfall, most winters
8.9 in. a year: that's Greene County's NOAA 1991-2020 snowfall normal, measured at ELLISTON, IN US (3.8 mi away). See the density guide.
Before you rely on Greene County's number
Treat the Greene 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.