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FPUS86 KSGX 012129
OPUSAN

JULY WEATHER IN SAN DIEGO

NIGHT AND MORNING CLOUDINESS CONTINUES THROUGH
JULY...BUT AFTERNOONS ARE GENERALLY CLEAR AND BRIGHT.  UNDER THE
PROTECTIVE BLANKET OF MOIST AIR FROM THE PACIFIC...TEMPERATURES ARE
LOW FOR THE LATITUDE.  THE DAILY MAXIMUM TEMPERATURE RARELY EXCEEDS
85 DEGREES.  THE HIGHEST TEMPERATURE IN JULY WAS 100 DEGREES IN
1930. THE ONLY 100 DEGREE DAY IN JULY ON RECORD. THE LOWEST
TEMPERATURE WAS 54 DEGREES IN 1884.  THE AVERAGE DAILY MAXIMUM
TEMPERATURE IS 74.6 DEGREES...THE DAILY MINIMUM 65.4 DEGREES AND THE
MONTHLY MEAN 70.0 DEGREES.

HOT...HUMID WEATHER IS ALMOST UNKNOWN AND AS A RESULT THUNDERSTORMS
RARELY OCCUR...BUT JULY BEGINS THE THUNDERSTORM SEASON IN THE
MOUNTAINS AND DESERTS. THE MONTH IS IN THE HEART OF THE DRY SEASON
AND RAINFALL IS NEGLIGIBLE AVERAGING ONLY 0.03 INCH.  SINCE THE
RECORD BEGAN IN 1850 OVER HALF OF THE JULYS HAVE BEEN WITHOUT
MEASURABLE RAINFALL.  THE WETTEST AND THE ONLY ONE WITH A TOTAL OF
OVER AN INCH WAS 1865 WITH 1.29 INCHES. AS THERE HAVE BEEN NO STORMS
OF ANY INTENSITY DURING JULY.

WINDS HAVE NEVER BEEN STRONG AND THE HIGHEST VELOCITY RECORDED AT
THE NATIONAL WEATHER SERVICE WAS ONLY 30 MPH IN 1925. THE AVERAGE
SUNSHINE IS 68 PERCENT OF THE POSSIBLE OR ABOUT 12 PERCENT ABOVE THE
AMOUNT FOR JUNE.  HEAVY FOG HAS AVERAGED ABOUT ONCE EACH JULY AND
NORMALLY THERE ARE 13 CLEAR...13 PARTLY CLOUDY AND 5 CLOUDY DAYS.
THE RELATIVE HUMIDITY AVERAGES 82 PERCENT NEAR SUNRISE...69 PERCENT
NEAR NOON AND 66 PERCENT AT 4 PM.



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