A Chronicle analysis found parts of Napa and Solano counties generally have the most extreme temperature swings between seasons in the Bay Area, based on data averaged over 1991 to 2020. The smallest differences between winter and summer temperatures were in cities along the Pacific coast, with San Francisco claiming the smallest change.
The analysis is based on the difference between average summer highs and average winter lows. This map shows gridded data, where each square represents an area of roughly 3 miles by 3 miles. The values are calculated based on data from weather stations, with adjustments based on coastal proximity and elevation impacts.
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While other parts of the United States can experience sweltering heat in the summer and frigid cold in the winter, temperature swings are generally less pronounced in the Bay Area.
The waters of the Pacific Ocean and San Francisco Bay moderate temperatures, said Jan Null, a meteorologist with Golden Gate Weather Services and adjunct professor at San Jose State University…