Snow Depth Days

To truly tell which winters have been the worst, I propose a variation on the HDD (heating degree days… along with cooling degree days, great tools for comparing climates) calculation of “snow depth days” that also includes a multiplier of air temp (or maybe even adjusted for wind chill).  http://www.wermenh.com/sdd/ne-1415.html

Or maybe the temperature should be an inverse of some sort, so good winters would be lots of snow, but also somehow mild temps.

Factoring in the amount of sun would be good too!