It's a grey day here ... dark enough to require turning on lamps ... so I'd like to throw this out for comment.
Here in New England we look for a patch of blue in an overcast sky as an indication the weather might clear. We say we are looking for "the Dutchman's Pants" meaning that we want to find a patch of blue sky about the size of a pair of old fashioned (traditional costume) Dutchman's Pants.
You have anything similar?