Yup, squash bug juveniles. They come in swarms because the eggs are laid in big clusters, so then a whole bunch hatch at once. But was this last year? Even with weird weather, I can't imagine having bugs in January in upstate NY.
Squash bugs are sucking pests, suck the juices out of plants. Leaves lose nutrients and water and become speckled, later turning yellow to brown. Under heavy feeding, plants begin to wilt, and the point of attack becomes black and brittle. Small plants can be killed completely, while larger cucurbits begin to lose runners. The wilting resembles bacterial wilt, but isn't really a disease, just the result of the life being sucked out of the plant.
To start with, in spring, check the undersides of leaves daily for the eggs:
destroy any you find. I just tear off that part of the leaf and grind it under foot. They are well protected, just stomping doesn't get it and they are well adhered to the leaf, difficult to remove.
Place boards or shingles on the ground near your squash vines. The bugs shelter under them over night and you can collect them in the morning. In a cool morning, the bugs can't move very fast yet. Dust your plants and around them with diatomaceous earth. It is not a poison, but kills them by abrasion. Works pretty well on a wide variety of crawling pests, but has to be reapplied after rain. Mulching well, early in the season helps keep the adults that over-wintered in the soil from emerging.