Resolution criteria

This market resolves to YES if the ambient air temperature recorded at the official National Weather Service observation station in Spokane, Washington (Spokane International Airport, KGEG) reaches 32.0°F (0.0°C) or lower at any time before October 16, 2026 (11:59:59 PM PDT on October 15, 2026). Otherwise, this market resolves to NO.

Resolution will be verified using official weather observations and Daily/Monthly Climate Reports (CLI/CF6) published by NOAA's National Weather Service Office in Spokane, WA (NWS Spokane Climate Data).

Background

Based on NOAA 1991–2020 climate normals, the median date for the first fall freeze (32°F) in Spokane, WA is early October (typically between October 3 and October 7 depending on the exact location within the valley and airport plateau). Historical observations recorded at Spokane International Airport show that sub-freezing temperatures before mid-October occur in a majority of years, though warm autumnal atmospheric patterns can occasionally delay the first freeze into late October.

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