Life Seasonal depression isn’t just for winter. Summer can trigger a mood disorder too June 22, 2022June 23, 2022Alia E. Dastagir, USA TODAYComments Off on Seasonal depression isn’t just for winter. Summer can trigger a mood disorder too Seasonal depression isn't just for winter. It can show up in summer, too, when stifling heat, more sunlight and social stressors overwhelm.