Sad thoughts and sunny weather.
Ah me, this glory and this grief
Agree not well together!
- Thomas Parsons, 1880, A Song For September
I was not able to determined if this is the entire poem or an excerpt.
Autumn is always a time of both relief and sorrow, of cooling days but shorter days. There is a jubilation in the vivid colors and lovely weather, but a sadness that comes with the death of anything we hold in value and the approach of increasing darkness. I think God made autumn beautiful to remind us that even death and endings can come with glory and beauty.
Psalm 30:11-12 Thou hast turned for me my mourning into dancing: thou hast put off my sackcloth, and girded me with gladness; To the end that my glory may sing praise to thee, and not be silent. O LORD my God, I will give thanks unto thee for ever.