A new examination of temperatures in the United States shows that there were two times more heat records set in the past 20 years than cold ones. The Associated Press analyzed temperature information collected by 424 weather stations across the country. The analysis included temperature information from 1920 to 2008. It found that, most decades during the 20th century had close to an even ratio of hot to cold records. But since 1999, 87 percent of the weather stations had more hot records than cold. And, 42 stations reported having at least five hot records for every cold one since 1999. At 11 stations, the hot-to-cold ratio during the period was 10-to-1 or greater. One place with the greatest difference in hot and cold records was the Southern California city of Pasadena. It went 19 years between cold records, the analysis found.