Fires and Santa Anas in CA. Usually get in September.
Thanks to mans influence. Were man to leave the area alone the fires would shift back to the summer months....
Mediterranean/Chaparral Climate
Chaparral habitat covers only about 8.5 percent of California, and only ranges in elevation from near sea level to over 5,000' in Southern California, and up to 3,000' in Northern California. Yet, it is considered by many to be the most characteristic vegetative community of the state (Hanes 1987). This is especially true in Southern California. Chaparral communities experience long dry summers, and receive most of their annual precipitation, 10 to 32 inches per year, from Winter rains (Radtke 1983). Although chaparral is commonly referred to as one community there are two distinct types; hard chaparral and soft chaparral, more commonly referred to as chaparral and coastal sage scrub respectively.
It is commonly believed that fire has been an important component of chaparral communities for at least 2 million years; however, the true nature of the "fire cycle" has been subject to interpretation. In a period of 750 years, it generally thought that fire occurs once every 65 years in coastal drainages, and once every 30 to 35 years inland (Barro and Conard 1990). Many wildland blazes of the interior mountains of California are the cause of lightning; however, in the coastal ranges of the state, where coastal sage scrub is a dominant community, the "Catalina eddy" and marine influence create conditions where summer lightning rarely occurs (Radtke 1983). Despite the marine influence associated with the coastal range, lightning, or other nature causes, may still have played a major role in the creation of early to mid summer fires.
Yet, with the advent of fire suppression, fires in this region now occur predominately between late fall and early winter, coinciding with the Santa Ana winds. These fires differ in intensity from the interior summer blazes as Santa Ana conditions result in lower than normal humidity levels and produce high wind speeds which further intensify a wildfire to a point where it produces its own weather conditions creating what is commonly referred to as "firestorm". These fires are often too intense to control until fuels are either consumed, weather conditions change, or the fire reaches the sea.
Natural History of Fire and Flood Cycles