What they found: Average springtime temperatures warmed by 2.2 degrees from 1970 to 2023 across nearly 230 U.S. cities analyzed by Climate Central, a nonprofit science and communications organization. The group's analysis is based on National Oceanic and Atmospheric Administration data and looks at meteorological spring, which begins March 1 and ends May 31.
Spring has gotten notably warmer in the Southwest, where average seasonal temperatures have risen by more than 6 degrees in some places.
Zoom in: In Houston, the average springtime temperature was about 66 in 1970. It was 71 last year.
The bottom line: Warmer springtime temperatures can lead to longer allergy seasons and changes in agricultural growing times.