I drove Antalya to Marmaris last January. On the way to Marmaris it was suuny and warm.
On the return it was completely different!!!
It was total white out over the mountain, you could hardly see the road. I rescued a lorry driver and he accompanied me to Antalya.
I think if I had started out a few hours later I would not have made it.
The previous year I was given snow chains with my hire car! I thought it was a joke. We didn't need them that year.
Amusingly there is a petrol station high up on the mountain road and they have a couple of ostriches out the back. Strange to see them in snow!