evidence: In the United States, the most recent decade (2000-2010) was the nation’s warmest on record. Record-breaking high temperatures are now outnumbering record lows by an average decadal ratio of 2:1. Record highs are occurring more often than record lows due to climate change. [...] Looking ahead, under a moderate rising emissions scenario, the ratio of record high maximum to record low minimum temperatures in the US is projected to continue to increase, with ratios of about 20 to 1 by mid-century and roughly 50 to 1 by the end of the century. Resources - Recent U.S. temperature trends, NCA - Record highs vs. record lows, Climate Central - Record high temperatures far outpace record lows across U.S., UCAR - High and low temperature indicator, US EPA