After Record-Shattering September, 2015 Is On Track to Be Hottest Year on Record. By Jason Samenow, Washington Post, 10/21/2015. "September is the fifth straight month of 2015 to set a record high. Seven of nine months this year have ranked as top warmest. The only two months to fall short were January and April, which ranked second and third-warmest. Year-to-date, 2015 stands alone as the warmest on record by the sizable margin of 0.21 degrees (0.12 Celsius)."