Hottest Year (Again)

As expected, 2015 is now confirmed as the warmest year in the temperature record. NASA announced that 2015 was 0.13 degrees Celsius warmer than 2014 (NOAA reports 0.16 degrees warmer). NOAA indicated 2015 was 0.9 degrees Celsius above the twentieth century average.

Update (February 5):  Three things to know.