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Spring will be heating up across America, as new data reveals that nearly every major U.S. city has grown warmer over the past five decades.
Climate Central analyzed average spring (March, April, May) temperature data from 241 major U.S. cities and quantified the influence of human-caused climate change on each city’s warming trend from 1970 to 2025.
Spring has gotten warmer in 98% of US cities analyzed
By the numbers:
According to the findings, spring temperatures warmed in 98% (236) of the 241 U.S. cities analyzed.
From 1970-2025, spring warmed by 2.6°F on average across these cities. On average, spring has warmed the most in cities across the southern tier of the country, led by the Southwest (3.4°F), South (2.9°F) and Southeast (2.8°F).
California poppies (R) and Canterbury bells bloom after prolonged record drought gave way to heavy winter rains, causing one of the biggest wildflower blooms in years on March 16, 2017 at Diamond Valley Lake, near Hemet, California. (Credit: David Mc
The data also found that the top five spring warming locations were: Reno, NV (6.9°F); El Paso, TX (6.4°F); Las Vegas, NV (6.2°F); Tucson, AZ (5.8°F); and Albany, GA (5.5°F).
In addition, the report found that unusually warm spring days now happen more often in nearly every city analyzed. About 84% of cities now experience at least one more week’s worth of warmer-than-normal spring days than in the 1970s.
Spring warming driven by human-caused climate change
Dig deeper:
New attribution science analysis also used Climate Central’s Climate Shift Index to directly assess the influence of human-caused climate change on spring warming trends in the same 241 U.S. cities since 1970.
In nearly every city analyzed (98%, or 235 cities), human-caused climate change was the leading cause of spring warming – accounting for at least 50% of observed warming since 1970.
Secondary drivers of spring warming included natural climate variability (for example, the El Niño-Southern Oscillation) and other unresolved processes (for example, weather station relocations since 1970).
In the majority of cities analyzed (69%, or 167 cities), all of the spring warming since 1970 could be explained by human-caused climate change.
Human-caused climate change is mainly due to the heat-trapping carbon pollution that results from burning fossil fuels for transportation, electricity, heating and cooling, and more.
Winters have also warmed in most cities
Big picture view:
The findings echo Climate Central’s winter analysis, which also found that winters have warmed in the majority of cities over the decades.
From 1970 to 2025, winters warmed in 98% of 244 U.S. cities analyzed – by 3.9°F on average, the data found.
RELATED: Here's how much warmer your winter has gotten since 1970
On average, winters have warmed the most in cities across the Upper Midwest (5.4°F), Alaska (4.8°F), the Northeast (4.8°F) and the Ohio Valley (4.4°F).
The top winter warming locations were: Burlington, Vt. (8.1°F); Milwaukee, Wis. (7.3°F); Green Bay, Wis. (7°F); Waterloo, Iowa (6.8°F); Concord, N.H. (6.7°F); and Toledo, Ohio (6.7°F).
The Source: This Climate Matters analysis is based on open-access data from the National Oceanic and Atmospheric Administration (NOAA). See Methodology for details.