Days are typically clear with less than 25 percent humidity. Spring and Fall - Temperatures are most comfortable in the spring and fall, with an average high/low of 85 and 50°F. Winter - Winter brings cooler days, around 60°F, and freezing nights. It occasionally snows at higher elevations. Summers - Summers are hot, over 100°F during the day and not cooling much below 75°F until the early hours of the morning.