Hi @Former-Member
When it comes to depression and the seasons I reasonate with the above post @Former-Member. Sitting in the sun for a period of time in winter will definitely lift my mood - like a soft breeze on a hot summers day. That photosynthesise hit giving a bit of a renewed life spurt rising energy levels. So warmth and light does enhance mood. Temporary relief though. If windy it won't have the same effect. As the high winds does get me down - and I can't explain why. It just incites gloom in me.
I have lived in the far south in extreme below zero temperatures and also where it can become quite humid. I now live in a temperate climate and although the ideal weather to me it is becoming more increasingly humid and hotter each summer now.
Extreme temperatures of either season can worsen depression for me "if I am physically unfit at that time" (and this has become worse with age) - and/or if going through a difficult period. As the harsh extremities of winter and summer just makes life and dealing with my problems harder in a nut shell. Definitely the in-between weather seasons I find my energy levels improves so my mood will follow. I see that correlation of the body and mind with me. Weakened body, weaker mind - making depression worse or triggering it.
To try and counteract these mood changes in extreme weather I have found being more physically active and becoming fitter does helps tremendously (although exercise can become more difficult - a catch 22). If going through a difficult life period and that frost and heat makes it seem all the more draining, I work on distracting my mind with positive thoughts and activities which also does help. Combining the two and I am ready to face the storm.