Don't get too excited. It won't last.
NASA ran its numbers. NOAA, the National Oceanic and Atmospheric Agency, ran its numbers. They showed the same thing - 2015 was the warmest year on record or, as I like to call it, WYoR.
Enjoy it while you can, 2015. Pretty much everybody agrees, 2016 is going to knock you off that perch.
Actually, since the 14 of the 15 WYoRs have occurred since the turn of the century just being the latest WToR somehow has lost a bit of that luster.