Right now Cesky Krumlov is covered with snow. There is nothing weird about that - in this part of the Czech Republic the winter snow usually arrives in December and stays until March, when suddenly in a matter of days spring arrives. A white Christmas is virtually guaranteed as is skiing. If you go towards the Sumava mountains in the south and so rise 200 more metres you will find the winter snow lasts longer (starting at the end of November), which is good because there are some ski resorts there, the nearest to Cesky Krumlov being Ski Real at Kramolin.
No, what is weird is that only a week ago I was getting a suntan - sitting at a cafe table by the river and reading a book. It was that hot, well over 20 degrees. The winter snow failed to turn up for Christmas, made only a cursory appearance for New Year and then came for another too brief spell, before disappearing again. The Czechs all say they have never known a winter like it. I say it is like a British winter, and they say how lucky we are not to get snow. Of course that is not how I feel, I love the Czech winters - the diamonds in the snow, the bright winter sunshine, the crisp air - so much better than the depressing grey of England.