All-season tires are designed to function in varied but general weather conditions: dry roads and rain and in warmer temperatures. They are not engineered for specific weather conditions. If tires were vehicles, an all season would be a family sedan while a winter tire would be a Hummer. You can get through a blizzard with massive snow in a sedan possibly but it would be a lot safer to do it in a Hummer. It’s the same way with tires. You may make it through on all season tires but you will have much better results and you will be much safer with a good snow tire.