I think that might be a bit cold, but not sure. Mine sit at 62F at night and 74-75F day temps but are right in a south window. I don't think it's the temps that cause the leaves to fall, but the drought. It's a normal response to the dry season in Southeast Asia where they are native.
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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.)
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