The relatively new ALL
The relatively new ALL WEATHER tire category was basically created to allow motor vehicle fleet owners to end the seasonal switching between SUMMER and WINTER tires. It's mostly WINTER tires with changed tread compounds that provide the minimum acceleration NEEDED in the minimum light/mild snow conditions that the 3PMWSF test requires. For example look at the Firestone directional treaded WINTER tires and the directional treaded Firestone ALL WEATHER tires. The tread patterns are almost the same, but the ALL WEATHER tires have a significantly different tread material that has a higher probability of surviving SUMMER driving temperatures. IF you're going to be driving in snow conditions outside of the test parameters then you need significantly better dedicated winter weather tires.