>I have all season tires but was wondering if winter tires were a necessity out here?

No, you'll be fine with all season. I have a rear wheel drive truck with all season and get along just fine with some sand bags in the back of the bed to avoid fishtailing. I grew up in MN where it snowed almost every week, sometimes every day for months, and am used to driving in snow. Winter tires would be helpful for those in areas with TONS of snow regularly, like further up north.

Just make sure you have boots, a blanket, a candle, waterproof matches, some water, etc in your car/truck in case you ever get stranded. Snow can be slippery so if you lose control and end up in a ditch late at night, you might be there for a while. A candle can be the difference between life and death as it can heat your car enough to survive for as long as it burns. A small shovel is a good idea too. It can help if you ever get stuck.

>Also, does it usually snow like this and so late? I was under the impression winters in New England you guys would have like several snowstorms in December alone but I feel like this is the first time I’ve seen it actually snow and be blanket white.

It varies. For the time I've lived in New England (almost 10 years) its varied. It varied in MN too. This winter has seemed light on the snow so far, so I wouldn't be surprised if the next couple months will make up for the lack of snow in November and December. One year, there was a big snow storm in the beginning of April that left feet of snow for weeks.

>Lastly, where can I buy salt for my driveway?

Almost aby hardware/home store like Home Depot, Lowes, Ace, etc. We store ours in the big Home Depot buckets so it's easier to move and store during non winter months.