Do you know what this is?
It's on the stoop of an 1830's brownstone in Greenwich Village.
It came in particularly handy when the streets of the city weren't paved. Dirt streets were often muddy even without rain in the forecast. People threw their dishwater (and worse) out the windows. Horses weren't choosy when they felt the need for elimination.
This metal hardware was intended for people to scrape their shoes before entering the house.
Morning temperature: 73 degrees