JDL: Your example is exactly what I meant, and you nailed the key words; hot, dry summers. Here in the south/southeast it is only during those periods that the home territory of BF families can be reasonably predicted if their larger hunting and foraging area is known. Of course, one must must know where the fresh water spring are located within their general foraging area. During the hot, dry summers, not many folks are in those areas.
As for myself, I lucked out, because I hunted, prowled and prospected in the Ouachita Mountains for many years before I found out there were Boogers up there. Back then, I prowled up there a lot during hot weather and finding a cold water spring in an unexpected location was like finding a lead/silver vein.
During other parts of the year it's a crap shoot to try to get close enough to them on their hunting/foraging routes to even hear them vocalize at night. I learned a long time ago that it is much easier to just camp in their area, and let THEM find ME.
So many folks ask me to take them out at night so they MIGHT hear them vocalize among themselves or respond to calls, I still try to "head'em off at the pass" a lot. It's still a lot of fun, especially when we get lucky. (It's more fun when that happens if their are newspaper editors/writers tagging along. Surprisingly, they are always a hoot to have along.)