Hurricanes, wildfires, and heat dominated U.S. weather in 2020 One of the hottest years in U.S. history, 2020 was besieged by a record number of billion-dollar disasters, led by two of the most dangerous phenomena with links to climate change: wildfires and hurricanes. In its initial U.S. climate summary for 2020, NOAA catalogued a year that fell firmly in line with expectations for a human-warmed climate. The average temperature last year for the contiguous U.S., 54.37 degrees Fahrenheit, was the fifth warmest in 126 years of recordkeeping, NOAA reported. All five of the warmest years on record – 2012, 2016, 2017, 2015, and 2020 – have occurred in the past decade. The 10 coldest years were all before 1980.