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In page Altadena, California:

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The wettest calendar year was 1983, with 48.47 inches (1,231.1 mm), and the driest was 1947, with 5.37 inches (136.4 mm). The most rainfall in one month was 19.70 inches (500.4 mm), in February 1980. The most rainfall in 24 hours was 7.70 inches (195.6 mm), on March 2, 1938. Altadena averages 21.09 inches (535.7 mm) of rain a year, over 6 inches (150 mm) more than nearby Los Angeles due to the orographic effect created by the San Gabriel Mountains. Because of the slope on which the city is built, sewer lines in the city's northern section have been known to overflow significantly.[citation needed]