2024: Less snow than normal

[JoshandBaron]

And I am assuming that the calculations are weighted by area, so that many "thermometers" in one particular square mile do not outweigh a single "thermometer" in a different square mile. And probably more esoteric adjustments as well.

That's exactly what happens. Further, they aren't comparing average temperatures in different locations to each other, they are comparing the deviation from the recorded historical average at a given location and averaging that anomaly with the anomalies from other locations.