Seasonal Affective Disorder (SAD) typically refers to depression linked to seasonal light changes, most commonly in winter months. However, as climate change alters weather patterns, the predictability of seasons—and consequently, human biological rhythms—is being disrupted. Extended rainy seasons, unseasonably warm winters, prolonged droughts, and smoky summers are affecting not only physical health but also psychological stability.
Humans have evolved with circadian and seasonal rhythms that regulate sleep, mood, and energy. When these rhythms are disturbed—whether by erratic temperature shifts, unpredictable sunlight patterns, or climate-induced natural disasters—mental health can suffer. People accustomed to bright, dry summers may find themselves battling gloomier conditions, while milder winters might fail to trigger the same “end-of-winter” mood boosts. These shifts can exacerbate or trigger SAD symptoms in ways that traditional treatments may not fully address.
Moreover, individuals already prone to mood disorders are particularly sensitive to environmental changes. The psychological dissonance between expected seasonal norms and reality—such as Christmas without snow or summers blanketed by wildfire smoke—can deepen feelings of disconnection and sadness. This “seasonal drift” creates uncertainty, making it harder for people to mentally prepare and adjust to annual cycles.
Addressing this new dimension of SAD requires updating therapeutic approaches. Light therapy, mindfulness practices, and structured routines remain important, but public health messaging must also acknowledge the role of climate change in emotional disruption. Encouraging flexible coping strategies and emphasizing environmental resilience may help individuals better navigate these unpredictable seasons. As the climate shifts, so too must our mental health frameworks.
Kanishka