The larger I grew, the more moisture I required to maintain myself. There were a number of other trees around with similar needs. Ordinarily we store fluids in our trunks and root system which move by osmosis to our upper extremities, but during drought we deplete this moisture and our leaves begin to shrivel and die. Unless the ground moisture is replenished, we loose leaves and sometimes branches wither and die for lack of water. Hot weather also aggravates this condition.
Winds often blow as thermal currents move the atmosphere around.
Wet weather has its ill effects on us as well. Our root system becomes saturated and the water moves up the sap under our bark putting too much moisture in our leaves. The process of photosynthesis breaks down and our leaves begin to die from excessive fluid. All in all, I guess wet weather is easier to deal with than dry, but either one can be a pain in the limbs, if you know what I mean. The origin of the tree as an acorn.