Mood Swings in Different Weathers and During Seasonal Changes in Normal Population

This study aimed to investigate the impact of seasonal changes and weather conditions on the mood of people in Tehran. One-hundred and fifteen subjects were tested every season for one year, using UWIST, Beck’s Anxiety Inventory (BAI), and Beck’s Depression Inventory (BDI). Data were analyzed by MANOVA with repeated measures. The results showed that the pattern of positive mood changes was: spring, winter, autumn,and summer (decreasing order). An inverse pattern was found for negative moods: summer, autumn, winter, and spring. Regarding weather conditions, spring rain accompanied more positive and less negative moods. In the rainy weather, the study subjects had the best mental state. Other circums-tances that would probably have some effects on people's mood were also discussed. Gender factor had no main or contributing effect. Seasons and weather conditions can affect people’s mood.