When wildfire smoke degrades Boulder's air quality, how to read the AQI, where the smoke comes from, and how elevation and the foothills shape exposure across Boulder neighborhoods.

At 5,430 feet, Boulder's UV exposure runs higher than most US cities. Why altitude, thin air, and snow drive the UV Index to 10+ here, and how to read it season by season.

Twenty Ninth Street is Boulder's open-air mall, so the weather is part of the trip. A season-by-season guide to summer heat and thunderstorms, winter wind and cold, and the best shoulder-season windows.

Why Boulder bans every backyard firework, what July 4th weather brings, and how Stage 1 fire restrictions and dry-grass season shape the Front Range holiday.

Tube to Work Day floats Boulder Creek on June 26, 2026 at peak snowmelt. How to read the flow in CFS, gauge the cold water, and make the Class III safety call.

How Chinook winds form along Colorado's Front Range and why Boulder experiences temperature swings of 60°F or more within 24 hours during foehn events.

Why Boulder's weather differs from Denver's despite the 12 miles between them — elevation, foothills proximity, snowfall, freeze dates, and wind exposure compared.

A timeline of the September 2013 Boulder flood — meteorological cause, peak stream flows, the Front Range communities most affected, and the post-event hydrologic record.

Boulder Colorado weather month by month — NOAA 1991–2020 climate normals for temperature, precipitation, and snowfall, plus seasonal patterns visitors and movers should know.

Find the best Boulder and Colorado weather links: NWS forecasts, NOAA climate data, Weather Underground, live webcams, and severe weather safety tips.