Olld-Onne posted...
Your definition of T shirt weather and mine are not the same. XD
Depends how we're defining t-shirt weather. Being comfortable wearing a t-shirt indoors and just putting on an appropriate jacket/hat/gloves when going outside, without typically adding extra layers? That's me year-round in areas that get as cold as -40 (being outside for a while in -20C/0F or so is about where I draw the line for actually zipping my jacket up). Being comfortable outside in a t-shirt without a jacket for extended periods of time? I'd draw that line around 5C/40F, but for short periods even -10-20C isn't that bad.