The temperatures where I live are currently mid/late teens, but very changeable. A chilly morning can often get quite warm later on, or a nice day can suddenly get wet and cold.
If I'm wearing a dress or skirt in autumn/winter I usually wear boots and thick tights or leggings. It's definitely not got to that yet, but it's now too cold (IMO) for bare legs. I feel doomed to stay in jeans / trousers for the next few weeks.
I'm mid fifties so I should have worked all this out by now! 😆