Extreme Cold/Wind Chill in Helena Valley, Montana

Extreme Cold/Wind Chill February 11, 2025 · Helena Valley, Montana

What the National Weather Service wrote

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

The wider storm

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 1246419. Narratives are written by the National Weather Service forecast office that issued the report.

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