Asphalt shingles are the leading choice for residential roofing in the United States because they provide quality, durability, versatility and economy. Over 12.5 billion square feet of asphalt shingle products are manufactured annually â enough to cover more than 5 million homes every year.
Much of California has a Mediterranean-like climate with warm, dry summers and mild, wet winters. On the coast, the average daily high temperature hovers around 70Â°F/21Â°C and up), but can occasionally spike to 80Â°F 27Â° C or more on hottest summer days; freezing temperatures are rare, even in winter.
For example, the average daily high in San Francisco in July and August is 72 Â°F (22 Â°C), and in Walnut Creek, some 20 miles (32 km) inland, the average daily high in July and August is 90 Â°F (32 Â°C); a temperature gain of approximately one degree (Fahrenheit) per mile.he temperature gradient is most extreme between Santa Barbara and Death Valley, with temperatures between the two differing by 4 Â°F and 35 Â°F (2 Â°C and 20 Â°C) in the winter and summer. The extreme southwest, around San Diego, has a semi-arid warm steppe climate (Koppen BSh) as winters are drier there.