I have 3 good sized black cherry trees in my backyard. I just noticed that
they have lost most of their leaves.
It has been unusually cold and wet this year and the yard is a bit swampy
(Rochester NY), maybe that is responsible? Or maybe they do it every August
and I have just never noticed. (I have lots and lots of trees back there, so
not noticing these would be easy enough)

Is this something to be concerned about? If so, is there anything to be
done?
Thanks.