Like people, cats are different.... I've been feeding Feral cats in my neighborhood for years and I'm amazed how the hell they survive temps in single digits or lower. Brrrr. Some say.. "Well, they're feral cats?" Duh? Most of them were born to abandoned mothers who were house cats. It's not like the genetics change just like that? The sad truth is... Some survive till Spring. Some don't. Best guess.. Some just find a "cozy place" during the worst of it? Physiologically speaking... Their body temp/metabolizam is a bit higher than humans. The main thing is. That takes a lot of calories to do? My "Feral community" outside will easily consume TWICE normal during the coldest months. If you have an indoor/outdoor kitty....... Best option is some way for "Kitty-kitty" to get back in when needed. Option 2........ Forget calorie diet crap till March. Feed the little buggas as much as your budget will allow. There are "felines" living in the Artic? Frost bite doesn't seem to be a problem? Why not? Wish I knew when.... I leave the house and forget my gloves when it's 28 degrees outside? I suspect that "House cats" don't like it but.. Can't remember ever seeing a cat, "feral" or otherwise, with missing frost-bitten toes? Penguins live in 40 50 below. "Mother Nature" just hasn't let "Us" go that route Why? Ask Darwin? LOL?