Category: Climatology (Page 11 of 69)

These posts contain information about the long-term weather patterns of Boulder County. Potential topics may include 30-day weather outlooks, El Nino/La Nina, and seasonal forecasts. You will find less about the day-to-day weather, with more focus on longer trends and patterns.

Premium This Weekend in Colorado Weather: One final chance at soaking monsoon storms on Thursday before a heat dome takes over this weekend

July 24, 2025 / Ben Castellani

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This Week in Colorado Weather: July 21, 2025

July 21, 2025 / Andy

After a hot and mostly dry Monday, the Front Range is in store for a wetter stretch midweek, with an uptick in monsoonal moisture and storm activity. A favorable upper-air pattern and midweek cold front will drive daily thunderstorm chances and potential flash flooding, especially Tuesday through Thursday. Conditions will trend hotter and drier into the weekend and next week, exacerbating the ongoing drought and fire risk in the High Country.

Rare and beautiful funnel cloud spotted in the Foothills of Boulder County Wednesday afternoon

July 17, 2025 / BoulderCAST Team

Wednesday may have felt underwhelming across the lower elevations of the Front Range, where lingering low clouds kept things calm and cool for much of the day — but just west of Boulder, up in the sunshine-soaked Foothills, something rare and striking took shape Wednesday afternoon. A graceful funnel cloud twisted above the mountain peaks in a spot where such phenomena almost never occur. We explore why tornadoes (and their funnel-shaped precursors) are so uncommon in Colorado’s higher terrain, and take a closer look at what makes broader Boulder County particularly adverse to tornado development.

This Week in Colorado Weather: July 14, 2025

July 14, 2025 / Ben Castellani

Monsoon season may have officially started earlier this month, but it’s off to a sluggish and lack-luster beginning across Colorado. Boulder has seen frequent storms—yet little meaningful rain—and wildfire smoke from the Western Slope and neighboring states is starting to pool to our west. A cold front arriving Tuesday night will bring cooler temps and a bump in thunderstorm chances for Wednesday, followed by a promising shift toward a more classic monsoonal setup Thursday through the weekend ahead with continued daily storms. This week, we’re tracking some heat, smoky haze, and hopefully, a few solid soakings of rain.

Forecast Update: Boulder hit 101° for the first time in 13 years yesterday, but (somewhat) cooler air and storms are moving in!

July 10, 2025 / BoulderCAST Team

Wednesday brought historic heat across the Front Range, with Boulder hitting a record high of 101°F—the city’s hottest day in over a decade. A weak cold front has since cooled things off slightly, ushering in a good chance of storms the next few days as well. Sunday into Monday turn drier and hotter again as reverse monsoonal flow sets up, potentially stifling our typical summer storm pattern for a bit.

June 2025 Graphical Weather Review: A slow and steady browning of the Front Range

July 8, 2025 / Ben Castellani

June 2025 started out cool and rainy in the Front Range, but precipitation became much more scarce as the month wore on, with our landscape drying out and fire danger creeping up over time. The month also featured several rounds of damaging severe weather and multiple sizzling heat waves. Here’s a quick and colorful graphical recap of our weather during June and how it relates to climatology.

This Week in Colorado Weather: July 7, 2025

July 7, 2025 / Andy

It’s going to be a scorcher across the Front Range this week—with temperatures climbing fast and flirting with triple digits by midweek. But just as the heat peaks, a pattern shift arrives that will bring cooler weather and a chance of storms again by Friday. Read on for all our full outlook of the weather week ahead.

Cleaner air is just another reason that official city fireworks will never return to Boulder

July 5, 2025 / BoulderCAST Team

While fireworks once lit up Boulder’s Fourth of July, the city has moved on from the tradition due to rising fire risks, noise concerns, crowd issues, and high costs. But there’s another reason to consider: air quality. This year’s air quality data from across the Denver Metro area revealed that Boulder’s lack of a city-run fireworks show resulted in noticeably lower pollution levels compared to neighboring cities.