I'm the freak on the thread -- I love sunny days! They help ward off my tendency toward depression, as I personally associate blue skies and clear sunshine with positive things, and I find that overcast conditions seem to add something to what brings me down that I have to push against, so, one less thing to fight if it's sunny, for me.
I do have to wear hats with brims that shade my eyes as I am light sensitive, yet I still actually like bright conditions.
Temperature wise, about 80 F is nice for me. Low humidity, and very low wind speed -- something that seems to really get under my skin is when it's very windy, it seems to exhaust me to be out in that. A light breeze, low humidity and 80 degrees with clear skies, sunshine, a few white clouds, and I feel a lot happier and can almost fool myself it's "good times."