"2014 was the hottest year on record worldwide, with record-breaking global average temperatures for the months of May, June, August, September, and October. Although it was only the 34th warmest year on record within the contiguous United States, it marked the 18th year in a row in which U.S. temperatures exceeded the 20th century average. California, Nevada, Arizona, and Alaska experienced their highest annual temperatures ever recorded. Eight U.S. weather and climate disasters exceeded $1 billion each in 2014 alone. Looking beyond this single year, long-term observations show that the United States and the world are getting warmer, global sea level is rising, oceans are becoming more acidic, and some types of extreme weather and climate events are becoming more frequent and more severe. Temperatures are projected to rise another 2°F to 4°F in most areas of the United States over the next few decades, with far-reaching implications for urban and rural areas, food security and water supply, natural resources and human health, and sectors such as energy and transportation."
U.S. Global Change Research Program: http://www.globalchange.gov/