Just how warm Earth stays this December will determine if 2020 goes down as the hottest year on record. And it’s looking a lot like it will.

The National Oceanic and Atmospheric Administration calculated Monday that last month globally was the second hottest November on record, behind only 2015. Yet NASA and a European climate monitoring group said it was the hottest November on record. NASA has coverage over the poles that NOAA does not — and both the Arctic and Antarctic were very warm in November, NOAA climate scientist Ahira Sanchez-Lugo said to explain the difference.