Sorry I mentioned the smallpox - not many people know about this.
Weather is currently sunny but it was this morning and I had to scrape the ice of the car before I could drive off. The thing to remember is that the Peak District is the same latitude as Siberia so my advice, as a local, would be to come prepared for anything.
As for me, I'm staying at home (too many tourists at this time of year) and we're running the Sunday evening singaround at the Woodford festival anyway.