The San Francisco Bay Area is characterized by numerous mountains, hills, and large bodies of water. This has led not only to geographical diversity, but also to the creation of numerous microclimates. Santa Clara Valley, where the cities of Sunnyvale and Palo Alto are located, has a Mediterranean semi-arid climate.
Santa Clara Valley experiences relatively high levels of precipitation, as well as foggy, cool summers and mild, rainy winters. As a result, both residential and commercial roofing in the area should be able to withstand high moisture levels and temperature fluctuations. Many licensed roofers in Sunnyvale, like Shelton Roofing, recommend standing seam metal roofs for many reasons.