In reply to Mick Ryan - UKClimbing.com:
Was out on Moel Siabod, was an amazing temperature inversion all over snowdonia. Unfortunately none of the pictures do it justice, so I've not uploaded any of them. Was a really odd day, it's not meant to get hotter th higher you go, it was commented that we'd been colder on summits in mid summer than on that day! It did lead to some beautiful scenes walking up through the forest though, a real winter wonderland of sparkling trees.