Are season of birth, climate, and parental age predictors of adult temperament, character, anhedonia, suicidality, and self-harm?

Overall, our results point to the importance of the interplay between environmental and biological determinants of temperament and suggest that spring is related to deficits in affective interpersonal relating for those born during spring, and also to higher deaths by suicide in adults again during the same season. This could mean that this period of the year exerts an adverse effect on mental health, at least on vulnerable populations. Future research should focus on neurobiological differences in relation to the season of birth and climate, especially in the face of the changes in mental health that climate change might cause.