We have the Spirit of the Dessert (Utah, Arizona, Nevada) planned for June 5-14 next year. Friends say it will be too hot (aka 2020 weather) and we should go earlier or later. Contemplating 5/22 or 9/22. Anyone have any specific thoughts on this? We would prefer it to be not too hot. Thanks in advance for your thoughts! (and we know it may be a lucky guess!).