I placed the two females and the male together in a 4' Neo, plenty of room for all. They did appear to ovulate almost simultaneously, but the old guy got the job done. Normally you would not trust one male to successfully breed two females ovulating so close together.. I guess experience counts!
There is no weather phenomenon in sight.. high pressure dome, no showers, heat and breezy.. I have my doubts personally that there is any statistically significant proof that boas drop during rainstorms or whatever, it has a lot more to do with when they breed and ovulate and the temps they maintain during incubation. In other words, boas here breed during certain periods (predominantly) and because of husbandry practices and the natural period of time involved, they have babies in late Spring and Summer which is the time of year we get storms. But that is just my observation.
Here's something for you.. I had a really big year with these several years ago before I started selling and trading breeders.. seven females 2WC, 5F1s, all gave birth in a 30 hour period.. , three males did the breeding and ovulation in the group appeared to occur over a ten or twelve day time-frame.
It was raining.. raining boas!
Gus