Ted! Hi There! So glad to see you
One of our esteemed members of our bee club said that he had been in hives at 35 degrees, it was a quick get in the hive and get out, and to do a check like that in the morning so the bees have time to warm up the colony again before dark.
He added that it's not the bees themselves, nor the capped brood, that would suffer a temporary cold snap, it's the eggs that are most fragile of being exposed, and the eggs are deep in their cells.
I haven't had the need to test this lesson tho. But I have gone thru a hive from time to time at around 50 degrees, and all went well.