Which of these dresses do you think I should wear to a wedding in Montana in early July?

I am attending my nephew's wedding in the mountains of Montana (White Fish Resort) in early July. It is a day time wedding and colors will not matter so much for me. I am not in the wedding. I tried on some daytime wedding dresses at Macey's and these four all fit. Which of these do you like the best and think I should wear to this wedding. I waiver back and forth making this decision, so any help will be appreciated.

Dress #1
Dress #2
Dress #3
Dress #4
Neither. Please Explain.
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Which of these dresses do you think I should wear to a wedding in Montana in early July?
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