Sometimes you know that the season has changed.
It could be the colours of the leaves on the tree: the bright green buds of spring or the russets of autumn.
It could be the produce of the land: glorious flowers in the summer or barren earth in winter.
It could be the TV schedule: the return of Strictly, X-factor and Merlin from September or the plethora of sport in June and July.
Or you could be me.
I know that winter is coming.
Today I had to wear socks.