I met someone the other day who claimed she was never affected by the weather.  Rain, freeze, or shine made no difference to her moods.

Don't know about you, but I'm the other end of the spectrum.  As soon as the sun came from behind the clouds this morning, I forgot my bad night and worries.  Life suddenly felt terrific again.

Some people are driven by their hormones. I'm driven by sunshine - and the moon when relevant.