The US National Coalition for the Homeless has published a map (as featured on Atlantic Cities) outlining how cold it needs to be before overnight winter shelters are required to open in different states. According to the map, shelters in Baltimore don’t need to open until it’s 13 degrees Fahrenheit (equivalent to below -10 degrees Celsius). Fancy sleeping underneath a piece of cardboard in those temperatures.
There’s probably similar legislation elsewhere? Do share.