Perkins County, SD Roof Snow Load - Case Study Area
Perkins County, SD: no map figure, on purpose
ASCE 7's own snow load map has no single figure for Perkins County: the terrain is complex enough that the code (§7.2) requires an elevation-specific study rather than a county-wide value. That is the map being accurate, not a data gap.
FIPS 46105, population 2,832. 386 US counties get this same case-study treatment; Perkins County is one of them.
Perkins County in numbers
- Population2,832
- Annual snowfall, NOAA normal39.7 in.
- FIPS46105
Perkins County's snowfall, most winters
39.7 in. a year: that's Perkins County's NOAA 1991-2020 snowfall normal, measured at BISON, SD US (3.1 mi away). See the density guide.
Before you rely on Perkins County's number
Treat the Perkins 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.)