We AZ bear hunters pay close attention to mast crops such as acorns, which if you can find them, especially Gambel Oak acorns, will lead you pretty directly to bears. But, there seems to be no evident rhyme nor reason as to when oaks produce, or don't, and it sure seems to be unrelated to precipitation amounts or other easily observed environmental factors. It appears to be one of those "cyclical" things, such as ruffed grouse populations in the Great Lakes states, owing little or nothing to measurable environmental influences. I've spent years observing a small copse of Gambel oaks, and their production is wildly inconsistent. If any botanists are able to shed light on this, I'm eagerly all ears!