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Monthly Normals and Extreme Values for Hong Kong in September
Monthly Normals of Meteorological Elements for September 1981-2010,
with Extreme Values between 1884-1939 and 1947-2011 for Hong Kong
 
Meteorological Elements Date on which
extreme value
was recorded
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ATMOSPHERIC
PRESSURE
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Absolute Maximum
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1018.2
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hPa
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26/9/1902
Mean 1008.9 hPa  
Absolute Minimum 953.2 hPa 1/9/1962
Mean Diurnal Range 3.6 hPa  
AIR TEMPERATURE Absolute Maximum 35.2 deg. C 5/9/1963
Mean Daily Maximum 30.1 deg. C  
Mean 27.7 deg. C  
Mean Daily Minimum 25.8 deg. C  
Absolute Minimum 18.4 deg. C 26/9/1935
RELATIVE HUMIDITY Mean 78 %  
Absolute Minimum 26 % 17/9/1966
AMOUNT OF CLOUD 66 %  
RAINFALL Total 327.6 mm  
Duration 78 hours  
Number of
Days with
0.1 mm
or above
14.67    
25.0 mm
or above
3.80    
50.0 mm
or above
2.00    
Maximum Hourly 84.0 mm 22/9/1948
Maximum Daily 325.5 mm 27/9/1965
Maximum Monthly 844.2 mm 1952
NUMBER OF DAYS WITH THUNDERSTORM 4.40    
NUMBER OF DAYS WITH FOG (Visibility < 1000 m) 0    
SOIL TEMPERATURE
AT 0700 HOURS
0.5 m 29.6 deg. C  
1.0 m 29.3 deg. C  
BRIGHT SUNSHINE
AT KING'S PARK
Duration 172.3 hours  
Percentage of Possible 47 %  
WIND
AT WAGLAN ISLAND
Prevailing Direction 090 degrees  
Mean Speed 22.6 km/h  
Maximum Gust # 234 km/h 16/9/1999
SEA SURFACE TEMPERATURE
AT NORTH POINT AT 0700 HOURS
27.1 deg. C  

Note : All measurements were made at the Hong Kong Observatory except where specified.

 #  1953 - 2011

Last revision date: <20 Dec 2012>