Yeah, saying 11c is warm is going a bit too far. It has felt very mild to me today though. Even right now, it's 9:30pm, current temp is around 10c and I can actually walk outside with a t shirt on and it feels comfortable!It's the same every year at this time though for me. My body seems to get used to the cold and as soon as the temp rises above 10c, It feels kinda warm!
When the temp is 10c in October time though, it feels cold! Just the body acclimatising I think.