My comment here may leave me open to ridicule from some, but I obtained my license before the advent of the intrument awarness for any inadvertant IMC,.... hence if I see such grey or white stuff anywhere on my planned route I give it a very respectable wide berth, indeed I have in the past done a one eighty and retreated several miles to rethink my route, on two occasion I flew back to EGNH and ended my flying for the day.
I am not Mary Poppins, but the clouds are for far better pilots than I!
Peter R-B
Vfr