Denver broke a record daily high set 70 years ago on Monday, and forecasters with the National Weather Service in Boulder said temperatures could still get warmer before the day’s over.

While Dec. 22, 2025, saw the second-hottest temperature ever recorded in December, Dec. 22 has also seen the second coldest temperature ever recorded in Colorado. In 1990, it was 25 below!

It likely comes as no surprise, but the data confirm: It was one of the warmest-ever years in Colorado. The state saw the fourth-warmest fall ever recorded, and through November, it’s been the 9th warmest year overall, in 131 years of recorded weather data.

If the data is confirmed next week, it will mean that four of the past five years will be among the hottest ever recorded in the country.

Through Dec. 10, the average temperature in Phoenix for 2025 is 77.7 degrees. If the year ended today — hypothetically — that would make 2025 the second-hottest year in Phoenix history.

The weather is not feeling at all like Christmas as Denver set a new daily heat record on Monday and will likely see its warmest-ever Christmas Day.

A new analysis of July temperatures in Death Valley between 1923 and 2024 suggests the world record near-surface air temperature of 134 F measured in July 1913 may be erroneous. When you purchase through links on our site, we may earn an affiliate commission.

The Arctic has experienced its hottest year since records began, a US science agency announced on Tuesday, as climate change triggers cascading impacts from melting glaciers and sea ice to greening landscapes and disruptions to global weather.

Ready for some warmer weather. Just think back to 1982, 2001 and 2023 — when New Jersey averaged some of the hottest temps in December.