Factors that effect deciduous autumn color?
Factors that effect timing and quality of deciduous autumn color?
Day air temp?
Night air temp?
Sunny or cloudy?
Length of day?
Nutrients in the soil?
Water, or lack of water? What does watering a tree in autumn do as far as leaf color?
Of course individual tree genetics are also a factor but ignoring that, just trying to understand the basics of what is going on this time of year, the "why" of all the variables.
Maybe somebody will learn something. Add pics if you like.