What differentiates a normal rainfall year from a dry year?
Most of California’s precipitation comes from storms moving across the Pacific Ocean. The path followed by the storms is determined by the position of an atmospheric high-pressure belt that normally shifts southward during the winter months. On average, 75% of California’s annual precipitation occurs between November and March, with 50% occurring between December and February.

Show All Answers

1. What is a drought?
2. What differentiates a normal rainfall year from a dry year?
3. What were typical reductions in urban water use during the last drought?
4. When was California’s last major drought?
5. How do droughts affect groundwater use?