I love cool weather (lows in the 40s and highs in the upper 50s-60s) for just getting out and about; prefer the heat for cycling, at least over 70 F, preferably in the 80s. Maybe I just don't have enough cool-weather gear yet...
(We cooled down - into the 80s, from 90s and 100s - the past couple of weeks, and I got it in my head I only needed one bottle when I went out yesterday. It turned into a record high 99 degrees - not enough ice in the bottle, so half-way through, I was drinking warm water+gatorade, and ran scary-low by the end of the ride. It was the hottest/most unwell I felt on the bike all summer. Learned a pretty valuable lesson...)