Not to double-post, but I learned another something new today: how to determine whether or not fall will be colorful or dull.
Apparently, it all depends on what the weather in September is like: if September has mostly sunny and dry weather with dropping temperatures, then the fall foliage will be bright and colorful; however, if September has mostly cloudy and rainy weather with warm and muggy temps, then the fall foliage will be dull and near colorless.