Re: ok to open hive???
I cracked mine and added some ventilation when it was mid 20’s and dry. I live in the rainy side of Oregon and when it hits warm we get rain and fog (we are fogged in now). My thought was it was better for them to be cold than wet. We never did get our ice storm to seal them in and in hind sight it may have been better to leave them alone. I had 3 outlying yards to get to and the frozen ground made getting to them easier. So I am saying that you probably have more than that single paragraph of the OP that is deciding your circumstances. Good luck but do tell us what you should have done after you get your results (even if you did nothing).
“Why do we fall, sir? So that we might learn to pick ourselves up” Alfred Pennyworth Batman Begins (2005)