The slope of the curve is highly confined by physics. However, it is the slope that indicates the current temperature. This time last year there was a very unusual warm current from the Pacific and you can still see the remnant channel it carved.
Meanwhile, our unusual warmish anomaly is being attacked slowly. The Arctic was about 3C warmer than usual, and is now down to about 1C.
The Pacific is getting fed warmer water at the source of the belt current. That means the plumes are changing and could give us 'high hits'. Then we get clippers.
There has been a lot of news on the Polar Vortex coming down to hit us. Please remember that in terms of energy, the stratosphere (polar vortex) is a flock of charging butterflies, the atmosphere is a herd of charging goats, and the ocean is a herd of charging elephants. The butterflies don't influence the goats, and the goats can't deflect the elephants. If you want to go with physics, instead of magic, then it's always the other way around.
So, magic or otherwise, we expect Winter to do what Winter does, and get colder.