Last night was bit below 10 Celcius (50 F). Rained all night. Slept with my topquilt fully open in a t-shirt. Didn't feel a thing under my butt or back so I'd say it can go at least 5 - 10 Celcius lower than that.
I had the spaceblanket on top of the ocf. I didn't see a drop of moisture anywhere except the rainfly which was soaked from the rain.
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