Autumn seemed to arrive suddenly that year. The morning of the first of September was crisp and golden as an apple, and as the little family bobbed across the rumbling road toward the great sooty station, the fumes of car exhausts and the breath of pedestrians sparkled like cobwebs in the cold air. Two large cages rattled on top of the laden trolleys the parents were pushing; the owls inside them hooted indignantly, and the redheaded girl trailed tearfully behind her brothers, clutching her father’s arm.
What does the phrase "crisp and golden as an apple" mean?
If golden meant dry day, why was their cold air?
Thanks in advance