Studies suggest a warming climate will further increase the number of stagnation days, a key factor influencing air pollution.
For most of the nation, summer weather has been changing in ways climate scientists say are consistent with what they’d expect in a warming world.
As temperatures rise, planting zones are on the move.
The average number of tornadoes in each state between 2005 and 2014.
Severe weather climatology expanding and contracting across the U.S.
A state-by-state look at how spring is coming earlier, on average, in a warming world.
Spring has been getting steadily warmer almost everywhere. Nationwide, temperatures have climbed an average of 1.9°F since 1970 (0.42°F per decade).
Average precipitation during meteorological spring hasn't changed much since 1970. But regional patterns tell a different story.