TIL Autumn colour vibrancy depends on temperature variation balance. Sunny days with cool, crispy (not freezing) nights result in best colors. Daylight produces sugars, cool nights break down chlorophyll (green), non-freezing Temp traps the sugar in the leaves, and sugar concentration leads to color

https://www.rmets.org/metmatters/autumn-colours-forecasting-fall-folia…
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https://www.reddit.com/r/todayilearned/comments/1gde7km/til_autumn_colour_vibrancy_depends_on_temperature/