<P> The climate of San Diego, California is classified as a Mediterranean climate (Köppen climate classification Csa). The basic climate features hot, sunny, and dry summers, and cooler, wetter winters . However, San Diego is much more arid than typical Mediterranean climates, and winters are still dry compared most other zones with this type of climate . </P> <P> Average monthly temperatures range from 57.3 ° F (14.1 ° C) in January to 72 ° F (22 ° C) in August . On average, 344 days a year are hotter than 60 ° F (16 ° C), but only 25 days are hotter than 80 ° F (27 ° C). </P> <P> Late summer and early autumn are typically the hottest times of the year with and average high of 78 ° F (26 ° C) in August and 77 ° F (25 ° C) in September . Temperatures occasionally reach 90 ° F (32 ° C) or higher . Snow and ice are rare in the wintertime, typically occurring only inland from the coast when present . </P> <P> San Diego experiences marine layer clouds, most often between May and August, which cause cool temperatures, cloudy weather and fog in the morning . Marine layer conditions linger until the heat of the sun becomes strong enough to evaporate the clouds . The local sayings "May gray" and "June gloom" refer to the way in which San Diego has the most trouble shaking off the early morning fog during those months, and cool, cloudy conditions often last into the afternoon or even all day . </P>

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