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TUESDAY, JUNE 9, 1981
THUNDERSTORM WARNINGS WERE ISSUED ON MAY 10, 11, 15 AND 31. THE STRONG MONSOON SIGNAL WAS HOISTED ON MAY 20 AND LOWERED THE NEXT DAY.
DURING THE MONTH NO AIRCRAFT WERE DIVERTED FROM HONG KONG DUE TO ADVERSE WEATHER, AND NO FIRE DANGER WARNINGS WERE ISSUED.
THE ONLY SIGNAL HOISTED WAS AS FOLLOWS:
WEATHER SYSTEM
SIGNAL
DATE AND TIME OF HOISTING
DATE AND TIME OF LOWERING
WINTER MONSOON STRONG MONSOON MAY 20 (9 PM)
MAY 21 (11.40 AM)
THE MONTH'S FIGURES AND DEPARTURES FROM NORMAL WERE
SUNSHINE
RAINFALL
CLOUD INESS
RELATIVE HUMIDITY
MEAN MAXIMUM
TEMPERATURE
MEAN TEMPERATURE
MEAN MINIMUM
TEMPERATURE
114.1 HOURS 48.5 HOURS BELOW NORMAL
336.1 MM: 38.0 MM ABOVE NORMAL
78 PER CENT 1 5 PER CENT ABOVE NORMAL
81 PER CENT 2 PER CENT BELOW NORMAL
27.8 DEGREES CELSIUS 1.1 DEGREES CELSIUS BELOW
NORMAL
25.2 DEGREES CELSIUS 0.7 DEGREE CELSIUS BELOW
NORMAL
23.4 DEGREES CELSIUS: 0.5 DEGREE CELSIUS BELOW
NORMAL
MEAN DEW POINT
21.5 DEGREES CELSIUS 1 1.2 DEGREES CELSIUS BELOW
NORMAL
TOTAL EVAPORATION
119.6 MM 33.4 MM BELOW NORMAL
MAXIMUM TEMPERATURE OF 31.5 DEGREES CELSIUS WAS RECORDED ON MAY 30.
MINIMUM TEMPERATURE OF 18.5 DEGREES CELSIUS WAS RECORDED ON MAY 4.
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