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San Gregorio is an unincorporated community in San Mateo County, California, with a population of 214 people. It is located in the San Francisco Bay Area, south of Half Moon Bay. Just east of Highway 1, it is one mile (1.6 km) inland on Highway 84, from San Gregorio State Beach.ClimateSan Gregorio has a cool summer Mediterranean climate (Köppen climate classification Csb).A National Weather Service cooperative weather station has been in operation in San Gregorio since June 1, 1954. San Gregorio enjoys mild weather throughout the year, except for some remarkably chilly mornings, even in the summer. Fog and low overcast are common in the night and morning hours, too, especially in the summer. The fog usually clears to the shoreline by the afternoon. Temperatures are often much warmer just a few miles inland than on the coast. Most of the rainfall falls from November through April.Normal annual precipitation is 29.52 inches (74.98 cm). San Gregorio has an average of 92.3 days with measurable rain. The wettest year on record was 1983 when 57.86 inches (146.96 cm) of rain fell. The wettest month recorded was 12.13 inches (30.81 cm) in February 1998. The maximum 24-hour rainfall was 6.87 inches (17.44 cm) on December 23, 1955. Although snow is very rare in the coastal lowlands, 4.0 inches (10 cm) fell in San Gregorio on January 21, 1962.Take a look at our United States day trip planner to refine the details of your trip to San Gregorio.
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