So the explanation of why Global Warming means you can experience colder weather sometimes, requires you to understand the 6 previous conventions zone.
Hot air rises and drops when it gets cold.
But the who globe can't be 2 convection zones from the equator to the poles, because the earth is spinning too fast.
So there are 6 instead.
And normally weather has difficulty breaking out of one zone and influencing another.
But with Global Warming, there is more energy in the weather, so it can.
And in fact, the current polar blast is because excessive heat has pushed the north pole over 15 degrees warmer than usual, and forced the cold air out of the polar zone, to as far south as Florida.
It is this recent mixing and violation of convention zones that has been caused by the additional energy of Global Warming.