What he said. Most likely yo're not running the bike long enough for the crankcase to "purge" itself. In my experience it takes no less than 40 minutes of run time. It is most certainly worse in cold weather.Fogging in the oil level window is pretty common in the cold and I especially noticed it on my 2012 DL650.
Nothing to be concerned about.
It's not going to hurt anything. It never has in any of my bikes.