Been through this area many times as a child.
First off, these mountains are not very high -- 3,200' elevation is the highest. Most are between 1,000 and 2400 in elevation. So of course they will not stay snow-covered in the summer, or even have snow outside of regular snowfall in the winter. In late fall and early spring, the highest parts may have snow even if the lower elevations are clear.
In the Poconos part (the eastern-northeastern part) there are lots of skiing places which are active in winter. I wouldn't exactly call them resorts -- they are a sort of working peoples' getaway. That whole area is very blue collar. Coal mining and production was a big thing. Bet there are lots of abandoned mines up there still. The city of Scranton can be perhaps be called the Poconos' capitol. It was built on coal mining and immigration -- German, Irish, Polish, and other Slavic nationalities. In the summer, boating, fishing, and hunting are popular, and camping. Very rednecky in that regard, and politically conservative. Deer hunting with shotguns, duck and turkey hunting also. Black bears still roam. Lots of boy scout camps in these mountains and the like. Since you are writing urban fantasy, there would be a lot of places for strange creatures to hide, and strange people as well, off logging and forestry roads. The doings on one mountain can be entirely separate from those on another. in the valleys, there are farms. Mostly family farms -- the coast of living up there is low so it's possible to turn a profit from farming and live comfortably.
The mountains have a mixed deciduous forest on them with some pine. These are not the forests of the American west with their big pine trees. The undergrowth is tangled. In the summer, it can be hot and humid.
In the present day the area is more populous, but in the 1970s, not so. You could drive on the state highways and see only little towns with a few houses and maybe a diner or antiques store. In the present day, of course, there are McDonalds and Duncan Donuts and strip malls.
The part of the Pennsy Appalachians directly under New York state is -- in present day -- more isolated and wild than the Poconos. That's the area between interstates 79 and 81, bounded on the bottom by interstate 80.
