Not much. Temperatures are cool enough.
We were there mid June this year. Light jacket weather. At the summit of The road to the sun, it was windy & very cold though the temperature at the base was in the 60s.
Not bad unless their is a bad storm.
No. Dewpoints are normally in the 40s during summer months.
We were there until Saturday this past week and the night temperatures were still in 40s and day temps are in 60s
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