Handy Hint/Something to think about....
...If the aircraft you're flying has spats and it picks up lotsa mud, it can freeze whilst you're up there and cause rather effective braking when you touch down again.
I've also known it where it happened on an unspatted PFA aircraft, that had drum brakes, where the mud found its way in and froze.
Certainly, the spats have just been taken off my 172 for this very reason. They'll probably stay off now until April/May.
I would imagine that the risk of freezing mud on retractables is also quite high at this time of year.