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The United States average for days above 90 °F (32 °C) is 37.9 days while San Diego's is only 2.5 days, and there are, on average 0 days below 32 °F (0 °C) in San Diego, while the national average is 88 days. The average low temperature in January for the country is 26.5 °F (−3.1 °C), and for San Diego it is 50 °F (10 °C). The average ...
Climate data for San Diego Int'l Airport (1991–2020 normals, [a] extremes 1874–present) [b] Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".
The Catalina eddy wind pattern, also called the "coastal eddy" or "marine layer," is a localized weather phenomenon that occurs in the Southern California Bight, the mostly concave portion of the Southern California coast running from Point Conception to San Diego.
In 1912, San Diego was the site of a free speech fight between the Industrial Workers of the World and the city government who passed an ordinance forbidding the freedom of speech along an area of "Soapbox Row" that led to civil disobedience, vigilantism, police violence, the abduction of Emma Goldman's husband Ben Reitman and multiple riots.
The months of May and June are typically the cloudiest months of the year in coastal southern California, having only 59% and 58% sunny days, respectively, on average in San Diego. [ 2 ] [ 5 ] The number of days in May and June that are "gloomy" varies from year to year.
San Diego received record rainfall for California at higher elevations causing floods and prompting road closures. [22] [18] Two tornado warnings would be issued for portions of San Diego County by the National Weather Service due to a severe thunderstorm produced by the storm complex, although no damage would be caused. [23] [24]
[57] [58] Because of their irregular and short-lived nature, the San Diego National Weather Service considers it "nearly impossible to forecast a Southern California tornado before it touches down." The agency utilizes a volunteer group of more than 1,300 volunteers to report local severe weather. [59]