Greetings Brian,
Yes, the lows concern me a little, but the highs in the low 60smnove me more. I have had a hive swarm on March 10 before. That means the queen cells were begun around February 24. That's less than two weeks from now. When did the congestion and swarm impulse begin before that? They were already getting swarm minded by this time in that year.
However, even though the hives are getting big populations now, I didn't divide the brood nest. i only put an empty frame on each side of it.
They aren't making drone cells yet, but they are beginning to festoon empty frames.
I think it will work out.