Climate & Weather in Gillette
Gillette has a real, genuinely cold semi-arid climate with very strong seasonal temperature contrasts: freezing, windy winters (winter seasonal average around 22.6°F) and short, warm, dry summers (summer seasonal average around 70.9°F), with meaningful annual snowfall and real, documented severe-storm exposure.
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Learn moreFreezing, Windy Winters
Gillette's winters (December-February) are cited with a seasonal average temperature around 22.6°F. Annual temperature extremes are cited ranging from approximately 14°F to 87°F typically, rarely below -6°F or above 96°F.
Short, Warm, Dry Summers
Summers (June-August) are cited as short, warm, dry, and mostly clear, with a seasonal average temperature around 70.9°F.
A Genuinely Cold Semi-Arid Climate With Strong Seasonal Swings
Gillette's climate is cited as cold semi-arid (Köppen BSk), marked by very strong seasonal temperature contrasts between its freezing, snowy, windy winters and its short, warm, dry summers.
Meaningful Annual Snowfall and Wind
Gillette averages approximately 49.4 inches of snowfall per year, with an average wind speed of approximately 10.8 mph and prevailing winds from the west.
Real, Documented Severe-Storm Exposure
As detailed on the flood-hurricane-risk topic page, Gillette carries real, current, documented tornado and hail exposure distinct from its winter-snowfall pattern -- including a suspected tornado that struck Campbell County as recently as August 14, 2026.
Key takeaways
- Gillette's winter seasonal average temperature runs around 22.6°F, with genuinely freezing, windy conditions.
- Gillette's summer seasonal average temperature runs around 70.9°F, with short, warm, dry conditions.
- Gillette averages approximately 49.4 inches of snowfall per year, consistent with its cold semi-arid climate.
- Gillette carries real, documented tornado and hail exposure, including a suspected tornado that struck Campbell County on August 14, 2026.
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