The pleasure of commuting in natural light is worth any penalty higher temps inflict! Cold and dark, bleah. In the heat of summer, I can commute home in the same garb I went into work with, and that garb is appropriate. That is a darn nice thing. But the spring and fall produce the nicest days, you just have to be able to add and shed clothing for the temp swings. I might imagine that someone lattitudinaly deficient might feel different.