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I've probably slept with the window open on days where the temps went down to 7-9C (45-50F) at night, usually in April/May when you could easily get those kind of Tmins after days where temps got into the 70s. But that was more down to accidental underestimating of how cold it'd get at night after a warm day than any intention on my part.
I always keep the window open here until there is a risk of freezing pipes, which happens around -2 to -4 C depending on wind and other factors. Indoor temps stay around 11-15C in midwinter and around 30C in midsummer.
More interesting question would be the coldest at which you've slept outdoors. For me that's also around -5 C, though I'm reasonably confident I could go significantly colder.
I slept with the window open between minus 4 and minus 4.5 degrees celsius.
About 29 F. Converted, that's -2 C. Usually doesn't get much colder-than here in Seattle. I sleep well in a cold room, like many men.
My queen (female cat) snuggles up under the covers when I do this, she stays close at night regardless but knows when to look for warmth. I have a down comforter than is medium duty, best buy I've made this winter (bought c. Nov-Dec 2020). The tomcat has a warm furry bed he appropriates downstairs where it's quieter, that's just how he rolls.
I've probably slept with the window open on days where the temps went down to 7-9C (45-50F) at night, usually in April/May when you could easily get those kind of Tmins after days where temps got into the 70s. But that was more down to accidental underestimating of how cold it'd get at night after a warm day than any intention on my part.
Same here. If it's been really warm in the 80s but cooling off to the mid 50s I'll have it open. But then some times it overachieves and actually cools down into the 40s. Then I wake up freezing my ass off. ~60 is perfect for me if it's been a decently warm day. upper 50s sometimes get too chilly in the morning but otherwise comfy.
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