Come on mjp, you can do better than that.
What do you make of Rutgers data. Not a bad site with good access to weekly snowfall extent data for the last 50 odd years.
Broken down to areas. North America (only), Euroasia, North America and greenland
real interesting take on it. Looks much looks like as ozone and OLR do a change in direction during the early to mid 90s. Pretty neat coincidence. Again!
