Colorado is known to have a humid subtropical climate with hot and humid summers and cold, pleasant winters. The area is quite prone to thunderstorms, hail, tornadoes and heavy rainfall. Though summer season is hot and uncomfortable, it is also the most crowded at the time because of the football games going on around the time.
The best time to visit Dallas would ideally be during the autumn months of September to November. During this period the weather becomes much bearable and most of the summer crowd also starts disappearing. Thus, though considered closer to off season, this is the best season to visit Dallas.