The indicator measures the amount of rainfall in Santa Barbara during the last century. The measurement is taken monthly for each water-year, which runs from October though September. Rainfall is displayed as both inches per month, and inches per water-year.

Evaluating rainfall trends provides valuable insight into the past health, and potential future of the economy, society and environment for a community. Santa Barbara is affected by flooding during high levels of rainfall, as seen in 1998 (the El Nino year). While predicting what the rainfall will be like from year to year is difficult, the community can be prepared for any amount of rainfall through proper planning, and special attention in flood zoned areas. This will help minimize damage caused by flooding. Rainfall could also be used comparison with other indicators that display the amounts of water consumed by Santa Barbara. This will help us see how much conservation is necessary.

The data collected for rainfall in Santa Barbara is tracked into the late 1800's. Over the past five years rainfall in Santa Barbara has been above average. Periodic spikes in rainfall are common over the past century, which shows this to be normal. Flood prevention programs in Santa Barbara are currently being proposed and in some cases construction has already began (Lower Mission Creek). Santa Barbara has recognized the problems associated with heavy rainfall and steps are being taken to reduce flooding. Data has not yet been retrieved for conservation efforts in Santa Barbara.