Fruit and Flowers are Falling Off Before Blooming or Ripening?

This year there is something different going on in our garden. We are having the flowers falling off of stems when not opened completely and the fruit seem to fall when not completely ripe/grown.

We are not doing anything different than in past years. Every year we have a good garden, with lush trees, good flowers, and fruit.

How do I get good fruit and flowers?

Hardiness Zone: 10a

By vidya dixit from Irvine, CA