Twin Peaks and the local 'fog shadow' microclimate

Twin Peaks rises to about 922 feet (281 meters) and is one of the highest viewpoints within San Francisco, producing pronounced local microclimates. The ridge funnels and blocks marine fog and wind, creating a measurable "fog shadow" and sun/fog contrasts between western-facing neighborhoods and the eastern slopes/central city on many days. Meteorological studies and local weather observations document these persistent microclimatic differences tied to the topography of Twin Peaks.