I had my Pirelli for 5 winters (sold with 111k on it). Every year around this time I got moisture in the oil (much worse than your feeble amount
) . I was doing 40+ miles each way to work, so it got nicely up to temperature every time it was driven. It disappeared as the air temperature started to rise again and the moisture level dropped.
Based on the amount that you have there, I wouldn't be concerned at all. Keep an eye on it. You might have an issue if it gets worse.
I am not convinced that the cap seals properly, so moisture gets in when the car isn't running.
Check for smoke when running to see if you have a gasket issue. Blue smoke = burning oil / white (hard to tell at this time of year due to moisture settling in exhaust) = water in exhaust gas