I have found that what you think you know about Screech Owls is often not quite true. For example, from observing owl boxes for many years, I had figured that Screech Owls use their nesting boxes as early as late October as as late as early June -- with no activity in July, August or September. Wrong.
An owling friend in Massachusetts writes: "FYI, Had a Screech owl spend day in one of the boxes Friday Aug. 13-- seems quite unusual. Have you ever had a screech occupancy in the summer?" (No.)
He posted an item (with photo) on his blog. Link is here.