What happened — or didn’t — weatherwise during the last two months starkly reminds us of the erratic nature of California’s vital water supply.

After months of severe drought, the state saw record-shattering storms in December, creating a hefty mountain snowpack while replenishing seriously depleted reservoirs. But January, historically a month of heavy precipitation, was bone-dry.

With climate change, California’s wet periods have become briefer, albeit sometimes more intense, and the dry periods have become longer, making the state’s elaborate water storage and conveyance systems less able to cope with precipitation patterns.