In reply to Kafoozalem: Exactly the point. In this day and age there should be a temperature/windchill/wetness adjusted grade. I propose....
Doorpost HS, sunkissed granite and 15 degrees.
VS in gloves
HVS below 5 degrees wearing so many layers your harness doesn't fit.
7a+/E4 below 2 degrees, wind , snow, gloves, layers, wet, verglass any other excuses you can think of etc