76º

Summer's coming early here in Chicago. I know I always feel happier when it's sunny and warm out, but is there science to back that up? According to a psychologist named Keller, pleasant weather was related to a brighter mood and better memory. These results are consistent with findings of seasonal affective disorder, which implies that after being deprived of sunshine and warmth in winter, we have much brighter moods in spring when the sun comes out.
All in all, stay outside as long as you can. You'll be happier.