In 2019, we scored the highest ever 500mb geopotential height anomaly at 80-90N, but 925mb air temperatures did not respond to it. 850mb did not respond. In fact, I think it had been pretty muted in the Arctic after about November of 2016...
we saw excursions of temperature especially in SON and DJF, into March and April but by May it usually calmed down, kinda the new normal, but overall the Arctic had a few recent years with only mild positive temperature anomalies, compared to what we were used to seeing. flick back through the archive at DMI80N
http://ocean.dmi.dk/arctic/meant80n.uk.php and it would seem like the really big anomalies are in 2016 and earlier, at least in terms of duration and power.
You can also look through the various levels of the atmosphere
https://psl.noaa.gov/cgi-bin/data/composites/printpage.plOr just chart a time series of the variable in question
https://psl.noaa.gov/cgi-bin/data/timeseries/timeseries1.plSo in 2020 it could have appeared that 2019, it's Modoki El Nino, the +IOD, etc had simply forced anticyclones to the pole with various downstream effects. May of 2020 rolls around and we have yet another dynamic final warming of the stratospheric polar vortex. Yet again, a barotropic anticyclonic atmosphere briefly attained positioning over the North Pole, but it was less extreme than 2019.
Geopotential heights 80-90N were elevated but not as much so as the year before.
Sadly, we started seeing in June that 925mb temperatures in the Arctic were sticking out like a sore thumb in the history of the atmosphere. It blew up. temps went from like -2C to +3C. 925 millibar height is around 2,500 ft up, or 760m. there were a lot of soundings. This is very new activity.
There is nothing published on this yet.
Now, if you look at June-July or May-July of 2020 the picture becomes disappointment. It is not a trend, this is a ka-booooooom