Not only winter depression, but also summer depression

Seasonal affective disorder, also known as seasonal depression, is a type of depression that occurs at a specific time each year. It usually starts in autumn and continues until the end of winter. Less sunlight can cause serotonin levels to drop, which can lead to sadness, low energy, and difficulty concentrating.

Seasonal depression can occur in spring or summer. Those who live in countries close to the equator may experience seasonal depression in spring/summer rather than winter depression. The symptoms of seasonal affective disorder seen in the summer can be similar to the symptoms experienced by people with winter depression.