Why it matters: Warmer springtime temperatures can lead to longer allergy seasons and changes in agricultural growing times.
Between the lines: Seasonal climate change discussions often focus on summer and winter, when temperatures are typically at their annual high and low extremes.
But the "between seasons" are affected too.
Zoom in: In Nashville, the average springtime temperature was about 59 degrees in 1970. It was 61 degrees last year.
Zoom out: Average springtime temperatures warmed by the same amount across nearly 230 U.S. cities analyzed by Climate Central, a nonprofit science and communications organization.
The group's analysis is based on NOAA data and looks at meteorological spring, which begins March 1 and ends May 31.