![]() Monthly averages Climate data for San Diego Int'l Airport (1981–2010 normals, extremes 1874–present) The average high temperature in July for San Diego is 76 ☏ (24 ☌). ![]() The average low temperature in January for the country is 26.5 ☏ (−3.1 ☌), and for San Diego it is 50 ☏ (10 ☌). The United States average for days above 90 ☏ (32 ☌) is 37.9 days while San Diego's is only 2.5 days, and there are, on average 0 days below 32 ☏ (0 ☌) in San Diego, while the national average is 88 days. San Diego's annual snowfall is 0 inches per year while the nation usually sees an average of 24.2 inches (610 mm) per year. The national average for mostly sunny days is 213 while San Diego's is 267. On average San Diego sees 21 days with some precipitation while the rest of the country sees about 110. VariationĬlimate in the San Diego area often varies dramatically over short geographical distances, due to the city's topography (the Bay, and the numerous hills, mountains, and canyons), thus exhibiting microclimate: frequently, particularly during the "May gray / June gloom" period, a thick "marine layer" cloud cover will keep the air cool and damp within a few miles of the coast, but will yield to bright cloudless sunshine between about 5 and 15 miles (8.0 and 24.1 km) inland-the cities of El Cajon and Santee for example, rarely experience the cloud cover. In winter, light snow is common in mountainous regions of east and north San Diego County above 3,000–4,000 feet (910–1,220 m). Snow flurries were last seen in San Diego on Februaround 1,700 to 1,800 feet (520 to 550 m), and the last measurable snowfall to hit various neighborhoods and suburbs around the city fell on December 13, 1967. Snow has been recorded falling on lowland San Diego communities only five times in over 125 years of record-keeping. The most rainfall in 24 hours was 3.23 inches (8.2 cm) on April 5, 1926. The most rainfall in one month was 9.09 inches (23.1 cm) in January 1993. ![]() The wettest year was 1941 with 24.93 inches (63.3 cm) and the driest year was 1953 with 3.23 inches (8.2 cm). Low elevation inland areas like El Cajon and Poway are the driest in San Diego County, followed by the coastal areas Cleveland National Forest receives more precipitation, and some inland areas like Laguna Mountains average more than 30 inches of rainfall per year.Īt the National Weather Service office, there are an average of 41 days with measurable precipitation. Famous examples include the 1858 San Diego Hurricane and the 1939 California tropical storm, as well as the remnants of Hurricane Kathleen in 1976, all of which brought several inches of rain and high winds to San Diego. ![]() Hurricanes are very rare, although San Diego receives more tropical storms and remnants of tropical storms than anywhere else in California. Rainfall is highly variable from year to year and from month to month, and San Diego is subject to both droughts and floods. The summer months are virtually rainless, although subtropical moisture from the North American Monsoon usually results in increased humidity and thunderstorms for at least a few days each summer. Rainfall is strongly concentrated in the cooler half of the year, particularly the months December through March, although precipitation is lower than any other part of the U.S. The average annual precipitation is less than 12 inches (300 mm), resulting in a borderline arid climate. San Diego has on average 146 sunny days and 117 partly cloudy days a year. Several cities near San Diego broke their all-time records that day. The record high temperature was tied only once and happened on September 27, 2010, 47 years and two days after the set record. The record low temperature was 25 ☏ (−4 ☌) on January 7, 1913. The record high temperature at the National Weather Service office in San Diego of 111 ☏ (44 ☌) was on September 26, 1963.
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