What is the meaning of "crisp"? Is it a word used to weather or season?

Native speaker’s answer
Rebecca
When speaking about the weather, "crisp" is used to mean cool, fresh, or invigorating. Thus, we can understand the speaker as saying "crisp Autumn morning" to mean "fresh, invigorating Autumn morning." Ex: The weather was crisp and sunny, the perfect day for a walk outside. Ex: He woke up to a crisp autumn morning.