MSN: The portion of days with warm weather in the U.S. have increased by 25 percent over the past 50 years according to a new data analysis. The analysis draws on publicly available data and represents the tip of the iceberg for how publicly available climate and weather data can be accessed and used. New York-based open data firm Enigma undertook the analysis. To do it, they dealt with the unenviable task of sorting through more than 860 million rows of data from 90,000 weather stations across the country....