Extreme Cold/Wind Chill — Helena Valley, Montana

2025-02-11 · Helena Valley, Montana

Event narrative

RAWS station HRWM8 Helena measured a -40F wind chill.

Wider weather episode

A cyclonic flow aloft, with several embedded shortwaves passing through it, allowed for several pushes of bitterly cold air to filter into the region from Canada in the early to mid February timeframe.

Source: NOAA Storm Events Database, event_id 1246419. Narrative written by the NWS forecast office that issued the report.