Today was perfect despite tiny rain drops - 54 degrees makes for a perfect riding environment for me. I used to be a 70-80 degree guy, but I don't even like 75+ anymore because the bike runs so bad, being air cooled it gets hot in no time and you can hear the difference when it's upset running hot.
45-55 degrees is nice, not brutally cold like 40 degrees and below, but not so hot that the bike suffers. Perfect all day comfort for rider and bike!
They really do need to make a watercooled TW300 or 400 so I can ride this thing in 65-85 degrees spring/summer without over heating it...lazy bastards! just do it!!!!