Monthly Normals of Meteorological Elements for June 1981-2010,
with Extreme Values between 1884-1939 and 1947-2011 for Hong Kong
 

Meteorological Elements					Date on which extreme value was recorded
ATMOSPHERIC PRESSURE	Absolute Maximum		1014.7	hPa	12/6/2004
	Mean		1006.1	hPa
	Absolute Minimum		973.8	hPa	9/6/1960
	Mean Diurnal Range		3.2	hPa
AIR TEMPERATURE	Absolute Maximum		35.6	deg. C	1/6/1963
	Mean Daily Maximum		30.2	deg. C
	Mean		27.9	deg. C
	Mean Daily Minimum		26.2	deg. C
	Absolute Minimum		19.2	deg. C	2/6/1926
RELATIVE HUMIDITY	Mean		82	%
	Absolute Minimum		29	%	1/6/1887
AMOUNT OF CLOUD			77	%
RAINFALL	Total		456.1	mm
	Duration		111	hours
	Number of Days with	0.1 mm or above	19.07
		25.0 mm or above	5.27
		50.0 mm or above	2.60
	Maximum Hourly		145.5	mm	7/6/2008
	Maximum Daily		411.3	mm	9/6/1998
	Maximum Monthly		1346.1	mm	2008
NUMBER OF DAYS WITH THUNDERSTORM			7.03
NUMBER OF DAYS WITH FOG (Visibility < 1000 m)			0
SOIL TEMPERATURE AT 0700 HOURS	0.5 m		28.5	deg. C
	1.0 m		27.6	deg. C
BRIGHT SUNSHINE AT KING'S PARK	Duration		146.1	hours
	Percentage of Possible		36	%
WIND AT WAGLAN ISLAND	Prevailing Direction		220	degrees
	Mean Speed		22.9	km/h
	Maximum Gust #		194	km/h	9/6/1960
SEA SURFACE TEMPERATURE AT NORTH POINT AT 0700 HOURS			26.5	deg. C

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

 #  1953 - 2011