I am about to make a split, but temps are forecast to dip back down into the 40s and possibly upper 30s at night again soon. Daytime temps are warm. I've taken out a couple of frames of capped brood and am a little leery of the temps - wondering if this risks chilled and killed brood. I've done splits successfully several years now, but haven't done it with such lingering cool temperatures. Wondering if better to put the new split above the old hive , atop a split screen to give them benefit of warmth from the bigger colony, for another week or so. Any thoughts?