Phoenix experienced its hottest winter on record, ending with a string of 90-degree days. Experts say it's a sign of a changing climate.

Phoenix broke a daily heat record Monday for the third consecutive day and reached at least 90 degrees for the fourth day in a row.

As the first day of 90 degrees or hotter arrives in the Valley, opinions are split: Some say it is too soon for the heat, ...

Today marked the hottest March 2 on record in Phoenix, according to meteorologists. Here's how long the unseasonable heat is expected to stick around.

Unseasonably warm weather continues for Arizona today, with the hottest temperatures of the year so far expected by the end of this week.

Phoenix reached 88 degrees Thursday, falling two degrees short of a daily record as a heat wave begins to peak across Arizona.

Well above normal temperatures are forecasted for Southern Arizona, with high temperatures expected to be 15- 20 degrees above average. Record heat is likely today. Highs will be in the upper 80s.

Daily temperature averages during the end of February are usually in the low 70s, the National Weather Service office in ...

Add Yahoo as a preferred source to see more of our stories on Google. The past 10 years have been the 10 warmest on record for the planet, according to the World Meteorological Organization. In the ...

Researchers from the University of Arizona and other institutions published a study on the trends and disparities associated with heat-related illnesses.

Paul Farmer, a local valley man, is enduring the scorching summer heat with zero air conditioning in his home to raise awareness as he checks in with Bruce and Gaydos. Arizona Senate president Warren ...