Here is some general info for USDA zone 11a to help you get started.
|Average Date of Last Frost (spring)||Never|
|Average Date of First Frost (fall)||Never|
|Lowest Expected Low||40°F|
|Highest Expected Low||45°F|
This means that on a really cold year, the coldest it will get is 40°F. On most years you should be prepared to experience lows near 45°F.
Below is a list of planting guides for Zone 11a.