I prefer cooler temps for sure. Yesterday was ~10*C and it was awesome. I've ridden from below -20*C to above 30*C and I would take the the -20 over 30, but maybe not over +20. I hated every second on the 30*C+ ride. Every lungful of air felt like the air had been baked. do not want.

I also prefer no wind but living on the east coast, that's a vanishlingly rare event. Anything under 20 kmh is considered low. Worst I've commuted in was gusting to over 70 km/h (in the summer) and the worst I've ridden in was gusting over 100kmh (winter storm - took more than an hour to ride 5km... probably could have walked faster lmao)

"perfect" for me is when I'm almost uncomfortably cool for the first 5-10 minutes of riding - those are the days I over-heat the least for the rest of the ride.