I was hesitant about replying because I no longer grow orchids outside. We had a hail storm year before last that wiped out my rather large collection of specimen-sized Phals. But while I was growing them outside (several years) I never worried about water in the crown. If it rained, they got wet and stayed that way till the sun finally shined. They were not under cover (thus the hail damage) and it caused no problems. I really don't have any specific words of wisdom, but I wouldn't worry. Certainly if you get 40 days and 40 nights of rain you might have a crown rot problem. But that might be the least of your problems
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)