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The topography influences climate over the entire year. Spring Mountain District AVA receives 10 inches (25 cm) to 15 inches (38 cm) more annual rainfall than the Napa Valley floor or the eastern slopes of the valley. Total precipitation can range as high as 70 inches (178 cm) to 95 inches (241 cm) in some of the wettest years. [citation needed]
Napa Valley's climate and geography are shaped by a unique cooling effect, crucial for premium grape growing. [13] Originating from a cold ocean current from Alaska, this effect involves fog formation and cool air influx from the Pacific, offset by warmer air rising from California's Central Valley.
Extensive flooding occurred in the Napa and Russian rivers. Napa, north of San Francisco, recorded its worst flood to this time [29] while nearby Calistoga recorded 29 inches (740 mm) of rain in 10 days, creating a once-in-a-thousand-year rainfall event. [27] Records for 24-hour rain events were reported in the Central Valley and in the Sierra.
Get the Napa, CA local weather forecast by the hour and the next 10 days.
As sunlight spilled into California's famed Napa Valley on a summer day, rows of wine grapes reflected the benefits of this winter's record rainfall. California has more than 960 square miles ...
The Napa River flood of 1986 is considered by many to be the worst flood experienced by Napa, California, United States, during the 20th century. Twenty inches of rain fell in a 48-hour period; 7,000 people were evacuated, 250 homes were destroyed and another 2,500 were damaged. Three people died, and estimated damages reached $100 million.
The Upper Napa Valley was once the home of a significant population of Indigenous People, ... The most rainfall in 24 hours was 8.10 inches (206 mm) on February 17 ...
The city is the center of St. Helena American Viticultural Area (AVA), which expands 9,060 acres (14 sq mi) of the Napa Valley with over 400 vineyards encompassing 6,800 acres (2,800 ha) of cultivation. [9] St. Helena is the location of The Culinary Institute of America at Greystone and a campus of Napa Valley College.