San Diego is experiencing the coolest July since 1933, when Franklin D. Roosevelt was president. The average monthly temperature at Lindbergh Field in San Diego is running at 66 degrees, almost fives degrees below normal.
(Note to readers: Earlier, we said 'almost four degrees below normal.' This is a correction.)
The pattern will continue Tuesday, says the National Weather Service. The marine layer is moving back in. Temperatures will be 5-10 degrees below normal west of the mountains, and about two degrees below normal in east county.
"There's been a lot of troughs of low pressure off the West Coast of the country this summer," says Don Whitlow, a forecaster at the National Weather Service in Rancho Bernardo. "And there have been a lot of coastal eddies (which circulate cool, moist wind ashore, creating a thick marine layer.)"
In another measure of just how cool this month has been, the daily high temperature at Lindbergh between July 1-256was below average on 21 days. Today's high was 68, or nine degrees below normal.
It's been cool elsewhere, too. On Sunday, the temperature only reach 66 in Oceanside Harbor, the "lowest maximum" temperature for July 25 since the previous record of 67 was set in 1995.
"The marine layer and onshore flow will continue coastal low clouds and patchy fog during the nights and mornings, extending locally inland," the weather service says. "Only partial afternoon clearing at the beaches, mid-level moisture in southeast flow will cause afternoon clouds over the mountains and deserts, increasing Tuesday and Wednesday with a chance of thunderstorms. A little warmer toward the end of the week and early next week as high pressure builds."
Noteworthy: On this day in 1902, says the weather service, "0.83 inch of rain fell in San Diego, the wettest calendar day and 24-hour total for July on record."
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