New analysis (pdf) of climate data finds that since 1912, the United States has warmed 1.3 degrees. But that warming is concentrated in certain states, some of which have "warmed 60 times faster than the 10 slowest-warming states."
All of that is according to Climate Central, a research and journalism non-profit that seeks to inform the public about climate and energy. The center looked at data from the National Climatic Data Center's U.S. Historical Climatology Network.