The Earth's climate is (and always has been) dynamic and fluid.
You can't assign a human number to it and make it "stick".
Average, Normal, Median. Doesn't mean a thing to the climate.
It is what it is today. Not up, down, high or low. It is what it is.
10-12,000 years ago where Mary and I live we had a mile of ice covering the ground. We both have ice today, but even though it feels like it sometimes, it is not a mile thick.
Which one is "correct"? The mile of ice then of the foot of ice now?