When the weather is nicer, I do go to parks and places to walk my dogs, but in the winter, it's generally too cold and dark too early to do this. Not super interested in people watching, but I do like to get out. I do go out to dinner on occasion as well. The problem for me is that in order to make friends, I need to be able to repeatedly interact with them to get to know them before anything else. It's hard to explain, but I pretty much need to be able to learn about them, learn what common interests we have in order to learn if they're someone I want to engage with further.
We're a month past the equinox already and gaining minutes of brightness steadily. Scandinavian expression:
There's no such thing as bad weather, only bad clothing. Lots of recreational websites explain how to dress to stay both warm and comfortable. Unless it's seriously bad (as in thunder-blizzard), try to bundle up and get outside daily, ideally between noon and 2 PM, for longer than it takes just to walk the dogs. Throw snowballs at a tree or a boulder or a solid brick wall. Try identifying deciduous trees only by their bark, learn about how cloud formations predict the weather, observe what the squirrels and birds and other critters are doing at those times when you're out quietly on your own.
As for people, make friends with the Saints. There are a lot of traditional websites that detail their histories, some of these sites follow the daily liturgical calendar. Saints have had experiences that make the most valiant of us seem like wimps; we have a lot to learn and admire in them.
All of this is a matter of
deciding that you
want to take these simple steps every day. Ask Our Lord for encouragement and guidance. Look to Him and He will send you what you need.