Summer temperatures regularly reach highs in the 80s °F (~28–30 °C) with nighttime usually in the upper 40s to lower 60s °F (~9–18 °C) depending on elevation, distance from the ocean and degree of marine inversion present. Summer weather is dominated by a persistent Marine layer that can vary in depth. When the inversion layer drops below 300–500 feet, the higher elevations are deprived of marine influence and will often be subject to intense heat waves with daytime temperatures in the 95-105F (~35–40 °C) range and extreme low humidity with elevated overnight lows that offer little relief from the heat. Such conditions can lead to fires that can occur even before the official State of California fire season starts in the Fall. Examples of such fires include the 2016 Loma Fire, the 2009 Lockheed Fire and the Summit Fire in 2008 .