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I still need to put more water bottles into it and rig up venting. There's still a month left before I can plant outside without covering stuff. This looks like the last cold snap. Should only be frost a few nights now. Thus, all I really need are vents.
32° difference: 78F outside/110F inside; Full Sun
10° difference: 48F/58F; Dusk/Dark
6° difference: 36F/42F; Dawn, overcast, snowing
20° difference: 38F/58F; Noon, overcast, rain/sleet