Yorkshire's ice crust

It seems Jack's been out with his ice torch.  With a hardened crust of snowmelt, the paths are lethal - both in the village and on the moors.  

We got caught in a couple of these passing black clouds which held a mixture of sleet, rain and snow but, despite that, we still enjoyed a sing song. 

Funnily enough, after looking at my photo for today, Rich sang the same one. Can you guess?