With subfreezing temperatures and a wind chill near zero, the female's first appearance in her cavity was until 5:20. The cavity is in a London Plane tree that was used by an owl in 2006.
The female didn't like the cold and wind. She came out of the cavity three times only to return back to the warmth of the cavity before finally leaving. She made a few short calls, but nothing like the calls she makes in warmer weather.
It was so cold we left her sitting on a tree branch at 7:00 p.m. (The owls usually give us the slip, rather then us leaving with them in view.)
The male was not seen or heard the entire evening.