The latest forecast and air quality conditions for the greater Los Angeles area, including beaches, valleys and desert regions.
The average May cloud cover during the day in San Diego was a very gray 82.5%. The stretch from May 12-31 featured 18 days considered overcast, with two other days barely eking out enough sunshine to register as partly sunny amid 70% cloud cover.The high temperature at San Diego's airport only reached 70 degrees twice last month, and its overall average high of 66.5 degrees was tied for the fifth-coolest on record.Los Angeles was tied for second place with Greensboro, North Carolina, at 74.
The only spot with a cloudier May was in the far reaches of the Arctic. Utqiagvik, Alaska, just edged San Diego with 84.5% cloud cover, though the town on the Arctic shores of northern Alaska also only had an average high of 30 degrees – not exactly beach weather there. Cloudy days in late spring and early summer are not unusual for coastal Southern California – they call it "May Gray," which heads into "June Gloom." The sun is warm, but ocean waters are still in the 50s and lower 60s, which cools the air into fog, and nightly onshore marine breezes carry the fog and clouds inland. But those cloudy days are usually intermixed with several days of warmer, offshore winds that will keep the gloomy marine clouds at bay. Just not last month.
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