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Old March 25, 2016   #19
Cole_Robbie's Avatar
Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,301

I'm just using Cornell's data. Two years ago, I lost most of my plants on a night where the low was about 30 and a heater malfunctioned. It was a clear night, and I think the inside temp dipped well down into the 20's.

Clear nights are the ones that concern me the most. Tonight's forecast low is 36, but the sky will be clear. I'm still going to cover up my plants and run the heat.
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