Birmingham October 30th 2008 started off as a normal Autumn day and ended in Winter.
Morning rain 6c >>> mid/late afternoon 0c and heavy snow, overnight -3 with 2" of snow on the ground, ice snow still on the ground come next morning
Edit; best thing was that nobody saw it coming, even the Met'O said in the forecast for that day was "maybe a little Sleet for the hills"
And i know other parts of the UK had snow that day, even further South if i remember