As I have mentioned my JiangXi trip recently, the mercury dropped drastically as I headed 500km North. I had my long-sleeve polo, vest and a jacket to keep warm. Good thing I remember bringing my Nike thermal gloves as my finger joints have this tendency to ache very badly under extreme coldness.
It was a nice 15 degree Celsius when I set off and by the time I reached my destination it was down to just 3 degrees. Luckily, I was indoors and pumped full of alcohol when I retired to bed. It probably would have drop to Zero (or even lower) as the night wore on.