I just leave mine on a table in a well lit room and they usually ripen without a problem. Years ago I used to wrap mine in newspaper and space them apart in a cardboard box. That method seems a little tedious though. I've never tried it before, but supposedly if you place a few green tomatoes in a paper bag with a ripe apple, the ethylene gas from the apple will speed the ripening of the tomatoes. That would make for a nice experiment, why not do two bags, one with the apple and one without.
Snow? Thank goodness I'm in S.C. With luck we won't see frost before the third week in November, though it sometimes comes as early as the third week in October. Been too long since we saw a real snow, more than a dusting. Snow is pretty nice down here. It can snow six or eight inches and is gone a day or two later and might even be 60 degrees by then.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.