Until the 15th or 16th I will not be able to get accurite weather data, but here is some historical data for the area, I cannot get to any historical data for the national park, I am still working on that
Normal High: 67°F
Normal Low: 43°F
Normal Average: 55°F
Normal High: 57°F
Normal Low: 36°F
Normal Average: 47°F
This is about the latest in the year that I will be able to drive on these tires in that area!