[blackearl]

Is it the ability to be on the street year round? Maybe the more comfortable you are living outside, the more likely to use it as a bathroom. Colder climates force the homeless to use shelters and similar resources during winter months.

[catalogia]

Maybe, but there are a lot of people living on the streets in Philly even during the winter. During the coldest nights they send vans around to coax people into shelters or at least give them blankets. I'm not sure that can account for the difference though.