Climatograph

Prevailing Climate
California Chaparrals are classified as a Mediterranean Climate region, with hot summers and little rainfall. Winters are often cold and conducive to frost. 

Limiting Factors - Abiotic
Soil (nutrient poor)
Amount of rainfall (sparse, typically peaks in January/February)
Long summers
Hot Temperatures
Occasional fires

Limiting Factors - Biotic
Plant and animal adaptations to lack of water
Human encroachment