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Saturday, January 20, 1973
The rainy season started in early May when a trough of low
pressure in the South China Sea brought moist air to Hong Kong,
Rain was recorded on 27 days of the month with the total
rainfall amounting to more than twice the normal value.
In July, strong winds were experienced in Hong Kong during
the passage of Typhoon "Susan".
Since records began in 1884, "Susan" was the first tropical
cyclone which has remained within 200 miles of Hong Kong for more
than 5 days,
August was wet with rainfall about 50 percent above normal.
September was warm and the mean monthly pressure of 1011.3 mb
was the highest on record for the month.
October was much drier than usual and the total rainfall for
the month was 63 percent below normal.
A Yellow Fire Warning was issued on October 21, when the
relative humidity dropped below 65 percent. This was the first warning
issued since the introduction of the new Fire Warning System on October 9.
In November, Typhoon "Pamela" became the sixth tropical
cyclone to affect Hong Kong since records began in 1884.
Cloudy conditions with periods of rain persisted through the
middle of November, Fire danger warnings were issued on six occasions.
December was slightly cloudier than usual, There were several
outbreaks of cold dry northerly air during the month, alternating with
periods of warm and relatively humid weather.
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