Well, I'm going to St George's Hill tomorrow, whatever the weather. Not missing out on 36 holes and breakfast, lunch and snacks post round for a bit of rain and wind. And if there's thunder/lighting, then I'll settle for breakfast, 9 holes and a carvery at a fantastic course!
Do you use the Met Office Weather site? Bizarrely, I find this more inaccurate than BBC Weather. Never heard of XC, but I might set that as my default if people say it is better.