For those of us living in Southern California our cold nights are very different than the cool autumn evenings back East. We experience absolute minimum temps in the 40s or even high 30s in the middle of the winter a few nights of the year and usually the day time temperature rises back up to the balmy 60s. In the colder parts of the country the night time temp may say 40 something, but factor in bone chilling winds from Canada and low daytime temps only in the 50s, most orchids will not thrive in these conditions. I grow all my oncidiums out side. My night time temp can sometimes go into the 40s, but that is only for a few nights a year. If temp drops to the 40s back East I would advice you to bring them in.
Andrew
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