Monthly Normals of Meteorological Elements for March 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		1033.9	hPa	5/3/2005
	Mean		1016.0	hPa
	Absolute Minimum		1001.9	hPa	24/3/1918
	Mean Diurnal Range		4.3	hPa
AIR TEMPERATURE	Absolute Maximum		30.1	deg. C	31/3/1973
	Mean Daily Maximum		21.4	deg. C
	Mean		19.1	deg. C
	Mean Daily Minimum		17.2	deg. C
	Absolute Minimum		4.8	deg. C	1/3/1986
RELATIVE HUMIDITY	Mean		82	%
	Absolute Minimum		16	%	4/3/1977
AMOUNT OF CLOUD			79	%
RAINFALL	Total		82.2	mm
	Duration		101	hours
	Number of Days with	0.1 mm or above	10.90
		25.0 mm or above	0.87
		50.0 mm or above	0.37
	Maximum Hourly		52.5	mm	23/3/2002
	Maximum Daily		130.0	mm	23/3/2002
	Maximum Monthly		428.0	mm	1983
NUMBER OF DAYS WITH THUNDERSTORM			1.77
NUMBER OF DAYS WITH FOG (Visibility < 1000 m)			2.00
SOIL TEMPERATURE AT 0700 HOURS	0.5 m		20.9	deg. C
	1.0 m		21.0	deg. C
BRIGHT SUNSHINE AT KING'S PARK	Duration		90.8	hours
	Percentage of Possible		24	%
WIND AT WAGLAN ISLAND	Prevailing Direction		060	degrees
	Mean Speed		23.0	km/h
	Maximum Gust #		103	km/h	31/3/1960
SEA SURFACE TEMPERATURE AT NORTH POINT AT 0700 HOURS			18.0	deg. C

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

 #  1953 - 2011