Unfortunately very little …
Live Weather in general - and snow cover in particular - have been a constant pain in the “you know what” …
Also the fact that lakes and rivers are covered with snow in the winter has been a mentioned many times. It’s just a matter of “report and hope for the best”
you can vote here:
https://forums.flightsimulator.com/t/summer-snow/446664
and here:
and here:
There surely are more topics on the problem, but I can’t be bothered to search them all now.