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Old March 24, 2016   #1
Cole_Robbie
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Join Date: Jun 2012
Location: Illinois, zone 6
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Default High Tunnel Gets Colder Than Outside



That graph tells the story. The full article about it is here:
http://www.hort.cornell.edu/hightunn...isons_reid.pdf

http://www.hort.cornell.edu/hightunn...stic_study.pdf

I'm still struggling to grasp the physics behind it, but on clear nights atmospheric radiation can make a high tunnel drop below the outside temperature.

I thought this idea was worthy of a thread, for everyone growing under plastic. Whether you have a high tunnel, or just a few shelves with a drop cloth over them, it's quite possible for your plants to freeze even when the outside temperature never gets to freezing.
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