Cats are highly resilient creatures, grow thick coats of fur in Winter and survive cold temperatures remarkably well.
Outdoor Cat House/insulated Cat House for Winter/feral Cat House Shelter/feral Cat Shelter SMALL SIZE
Building Winter Shelters for Community Cats - Alley Cat Advocates Trap-Neuter-Release and Volunteer Services for Greater Louisville, KY
Welcome to Cats in Action - Helping People Help Outdoor Cats in Chicago
What needs to be considered when providing a winter shelter for feral cats? And how do you keep raccoons, opossums, and skunks from using the shelter? - Quora
Community Cats Humane Society for Southwest Washington
4 Tips for Sheltering Community Cats in Winter
Winter Shelters & Supplies for Outdoor Cats - Cats in Action
Coolers Turned Into Cat Shelters
My mom builds ultra insulated cat houses for the stray cats that hang around during the freezing winters : r/cats
How to Clear 500,000 Feral Cats From New York's Streets - The New York Times