I've often heard and read that if you have sealed drone brood, go ahead and start raising your queens. There is never any mention of minimum temps in the stuff I've read.
My reluctance to raising early queens is the fickle weather in SE Missouri that would hamper and hinder mating flights. Most of my yards are slick and muddy that getting in creates a problem, even for a 4x4.
On the other hand, my preference is to wait until May when the ground dries up, nectar and pollen sources are abundant and the weather is somewhat settled.
If I were you, I'd go for it. Nothing ventured, nothing gained. Besides, if it doesn't work now, raise another crop when it gets warmer.
Grant
Jackson, MO