December 28th, is 2020 to be the warmest year on record?

I would be a little surprised (concerned) if it was.  Normally a record year is as a result of a strong El Nino as well as the underlying warming trend. Whilst we have seen a weak event earlier, in recent months the trend has been more towards La Nina conditions and the year has been neutral overall.  (There is normally a lag of a few months between an El Nino and it's effect on Global temperatures)

https://ggweather.com/enso/oni.htm

Having said that, it is certainly going to be another warm one.  I'm expecting it to be second warmest when December's data is included.  That too would be warmer than I would have expected.

This will probably be my last answer for a while, so let me wish you and everyone a happy New year; all the best for 2021.

Stay safe everyone; it shouldn't be too long now before we get "normal" back.  :-)

Not in Australia I have had a Blanket on my bed for 5 days because there is No summer yet

NOAA is projecting that it will be, but we won't know for certain until the last month's global data are aggregated.  Sometime in the middle of January, typically.

------

Yes, it most likely will end up to be.

And this is a La Nina year, which generally depresses the global average.