Nearly all cities in the eastern United States, including Boston, Philadelphia and Washington, would have climates much more similar to those of cities hundreds of miles away to the south and southwest.It's not just the East Coast that could change. The Northeast would be more like the humid parts of the Midwest or southeastern United States. Western cities would be more like the desert Southwest. Cities in Florida would experience summers more like what parts of Mexico has today. San Francisco would have the climate of Los Angeles: 7 degrees warmer and 40% drier.The change could be particularly problematic in the West, where the study shows that the average distance between cities' future climate and current "climate analogs" might be shorter.Changes in elevation show just how drastically different the climate could be in the future.Take Denver, elevation 5,280 feet: The "Mile-High City" is known for its comfortable mountain climate and it depends on tourism featuring winter sports like skiing. But by 2080, according to the study, Denver's climate would be around 9 degrees Fahrenheit warmer and more like that of the Texas Panhandle city of Borger, elevation 3,077 feet.