Public Information Statement
Issued by NWS San Diego, CA

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NOUS46 KSGX 011810
PNSSGX

MAY WEATHER IN SAN DIEGO

MAY IS NORMALLY CHARACTERIZED BY PERSISTENT OVERCAST SKIES DURING
THE NIGHT AND MORNING HOURS AND BY LESS SUNSHINE THAN ANY OTHER
MONTH EXCEPT JUNE.  TEMPERATURES CONTINUE THEIR UPWARD TREND WITH
THE MOST NOTICEABLE RISE IN NIGHTTIME READINGS.  THE NORMAL DAILY
MAXIMUM FOR THE MONTH IS 68.5 DEGREES...THE NORMAL DAILY MINIMUM
59.4 DEGREES AND THE MEAN 64.0 DEGREES.  ON 3 DAYS THE RECORD
MAXIMUM TEMPERATURES WERE 95 OR ABOVE AND WAS 98 DEGREES ON MAY
25...1896 THE ABSOLUTE HIGH FOR MAY.  HOWEVER...THE COOL SEA BREEZE
PREVAILS NEARLY EVERY DAY AND TEMPERATURES ABOVE 80 DEGREES ARE
RARE.  NIGHTS ARE UNIFORMLY MILD AND THE LOWEST READING DURING THE
MONTH WAS 45 DEGREES IN 1915...1894...AND 1883.

OUR LONG DRY SEASON USUALLY BEGINS IN MAY AND THE AVERAGE NUMBER OF
DAYS WITH MEASURABLE RAIN IS 2 WITH AN AVERAGE MONTHLY TOTAL OF 0.12
INCH.  HOWEVER...ON 3 OCCASIONS THE MONTHLY TOTAL HAS EXCEEDED 2
INCHES WITH THE GREATEST RAINFALL 2.54 INCHES IN 1921.

STORMY WEATHER IS ALMOST UNKNOWN DURING THE MONTH AND WINDS OVER 20
MPH HAVE BEEN INFREQUENT.  ONLY TWICE HAVE WINDS OVER 30 MPH BEEN
RECORDED AT THE NATIONAL WEATHER SERVICE OFFICE.  THE HIGHEST WIND
EVER RECORDED IN MAY WAS 40 MPH ON MAY 29...1988.  THE OTHER TIME
WINDS OVER 30 MPH WERE RECORDED WAS IN 1922 WHEN WINDS OF 37 MPH
WERE REGISTERED.

ALTHOUGH SKIES ARE COMMONLY OVERCAST DURING THE NIGHT AND MORNING
HOURS...HEAVY FOG IS RARE...THE AVERAGE BEING ONLY 1 EACH MAY. CLEAR
DAYS NUMBER 8...PARTLY CLOUDY 12 AND CLOUDY 11. POSSIBLE SUN SHINE
IS 58 PERCENT ON ANY GIVEN DAY...ABOUT 11 PERCENT LESS THAN THE
WINTER DAYS AVERAGE.  MAY AND JUNE ARE THE CLOUDIEST MONTHS OF THE
YEAR WHICH IS A PARADOX BECAUSE THEY ARE TWO OF THE 5 DRIEST MONTHS
OF THE YEAR.  RELATIVE HUMIDITY SHOWS LITTLE CHANGE FROM APRIL WITH
HUMIDITY IN THE EARLY MORNING 77 PERCENT...NEAR NOON 65 PERCENT AND
IN THE AFTERNOON 64 PERCENT.

$$
EMI


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