Andrew Ellicott Douglass came to Flagstaff as an astronomer. But he spent his time here looking as much at pine trees as at stars and planets. Ponderosa pine, the most common tree, became the object of his research — leading him to pioneer a revolutionary science.

Officially at the airport, 1.64 inches in 2021 after getting only 1.62 in 2020.

Imagine a television so thin that it could be rolled up like a newspaper, or a thin film that could coat an entire building and generate solar power. Perovskites could make this possible.

Here in the desert, we can always use some rain — and Armin Sorooshian can make it happen. Sort of.

The punishing heat wave continues in much of the West. However, for some in places in the Southwest including Arizona, the long-awaited monsoon will bring milder temperatures and rainfall.

Drying juniper berries litter the ground as Rusine Stanley plunges a water hose into empty tanks in her backyard. As bubbles begin to gurgle, each tank fills to the brim.

Heatwaves are getting worse. Can urban America stay cool?

The University of Arizona recently launched a new game, in which the public can estimate rain measurements during the monsoon season and win prizes. 

In the scorching heat, against the backdrop of a vehicle barrier separating the United States from Mexico, officials from federal agencies in both countries came together to explain the dangers of crossing their shared border.

An East Troublesome-like fire seems inevitable for Vail, Aspen and other resort communities

A decades-long drought is taking its toll, causing water to disappear and causing a snow drought in the western part of the United States.