Up here we don't have the luxery of waiting for even 60F days
Complete tear down... I would wait til' 60F to 70F. You're exposing brood alot longer. During tear down pull your frames and place them in a box along the side of where you're working. That will lessen the chill.
I have done brood swap in very chilly weather (like 40F). Wind is a bigger issue here. Make the swap quickly with plenty of attached bees into a small box and it work OK even at cool temps.
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