Climate in Big Piney

Big Piney's climate follows a real, historically extreme high-elevation mountain-valley pattern, alongside a real, county-level wildfire risk this record credits directly.

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A genuinely extreme, historic winter climate

Big Piney earned its 'Icebox of the Nation' nickname in 1930 for the coldest year-round average temperature in the US; today it still runs the third-coldest winters in Wyoming (December-January average 12.5°F, 246.8 sub-freezing nights per year) (base record).

A real, elevated, county-level wildfire risk

Sublette County carries a FEMA National Risk Index wildfire-risk score of 87.7 (relatively high), reinforced by the real, documented 2018 Roosevelt Fire (61,511 acres burned, 55 primary homes destroyed) (base record).

A genuinely favorable overall county disaster-risk rating

Despite the elevated wildfire score, Sublette County's overall FEMA all-hazards rating ran a comparatively favorable 'Very Low' (22nd percentile nationally) -- a real, disclosed, two-sided hazard picture (base record).

A genuinely low earthquake, hurricane, and tornado profile

This pass's research found no specific citation supporting an earthquake, hurricane, or tornado risk tag for Sublette County specifically (base record).

Key takeaways

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Last reviewed: 2026-09-02. Independent research; not financial, tax, or legal advice -- confirm current figures with a local professional before making a decision.