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Monthly Normals and Extreme Values for Hong Kong in April
Monthly Normals of Meteorological Elements for April 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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1028.4
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hPa
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9/4/1925
Mean 1012.9 hPa  
Absolute Minimum 999.9 hPa 2/4/1924
Mean Diurnal Range 3.9 hPa  
AIR TEMPERATURE Absolute Maximum 33.4 deg. C 27/4/1956
Mean Daily Maximum 25.0 deg. C  
Mean 22.6 deg. C  
Mean Daily Minimum 20.8 deg. C  
Absolute Minimum 9.9 deg. C 5/4/1969
RELATIVE HUMIDITY Mean 83 %  
Absolute Minimum 22 % 17/4/1922
AMOUNT OF CLOUD 81 %  
RAINFALL Total 174.7 mm  
Duration 99 hours  
Number of
Days with
0.1 mm
or above
12.00    
25.0 mm
or above
2.23    
50.0 mm
or above
1.10    
Maximum Hourly 92.4 mm 30/4/1975
Maximum Daily 237.4 mm 19/4/2008
Maximum Monthly 547.7 mm 2000
NUMBER OF DAYS WITH THUNDERSTORM 3.50    
NUMBER OF DAYS WITH FOG (Visibility < 1000 m) 1.03    
SOIL TEMPERATURE
AT 0700 HOURS
0.5 m 23.5 deg. C  
1.0 m 22.9 deg. C  
BRIGHT SUNSHINE
AT KING'S PARK
Duration 101.7 hours  
Percentage of Possible 27 %  
WIND
AT WAGLAN ISLAND
Prevailing Direction 070 degrees  
Mean Speed 20.9 km/h  
Maximum Gust # 135 km/h 11/4/1990
SEA SURFACE TEMPERATURE
AT NORTH POINT AT 0700 HOURS
21.0 deg. C  

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

 #  1953 - 2011

Last revision date: <20 Dec 2012>