Ace,
In the Florida Panhandle we have a dearth from mid June after "popcorn" trees (Chinese Tallow or Sapiferum sebiferum). It lasts a couple of weeks until the Sabal Palms start. Our Sabals just started full swing this week (end of June) and it's a heavy flow with white wax being drawn. It'll be followed by a lighter amount from native sumac, Liriope ("monkey grass"), mexican clover, etc.
So yes, in early summer, there's a couple of crabby weeks where there are a great many bees, not a lot to munch on, and my robbing screens are on. Most beeks here locally harvest right before this dearth.