Yesterday was the coldest day in NYC in ten years (and the coldest January 7th since 1896)! From what I know, Rosie and Bobby were not seen yesterday (I did not visit Washington Square Park). A fellow Hawk-watcher visited the park and surrounding area but did not see them yesterday or this morning.
I looked for them for about an hour today (when it was a sultry 21 degrees) just before and after sunset but did not see them hunting or at any of their regular roosting spots. I hung around until it was quite dark but I never spotted them. I'll probably drop by the park at some point tomorrow. It's likely they found a good sheltering spot away from the blustery winds we have been enjoying so much.