On my ppl skills test, the weather was awful - low cloud, poor viz, showers. When the examiner (A300 captain) turned up I told him if it was my decision, then we would not go. "Good call", he said, "now go and prep the airplane, we'll be fine". It actually went very well, the nav section was very difficult 'cos the viz was awful. Luckily I knew the area pretty well, so was able to reach the turning points. For stalls, steep turns etc, I had to climb through the cloud, eventually breaking through at about 5000'. We managed to find a hole in the cloud to get down for the PFL etc.
Great examiner, great fun actually (he made it so), and a good test in the end. I've said so before, but sadly he was killed in a road accident a few weeks later. A big loss.