Monthly Normals of Meteorological Elements for December 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		1033.5	hPa	31/12/1913
	Mean		1020.5	hPa
	Absolute Minimum		1004.6	hPa	2/12/1974
	Mean Diurnal Range		4.1	hPa
AIR TEMPERATURE	Absolute Maximum		28.7	deg. C	1/12/1953
	Mean Daily Maximum		20.2	deg. C
	Mean		17.9	deg. C
	Mean Daily Minimum		15.9	deg. C
	Absolute Minimum		4.3	deg. C	14/12/1975
RELATIVE HUMIDITY	Mean		69	%
	Absolute Minimum		14	%	14/12/1898 31/12/1973
AMOUNT OF CLOUD			52	%
RAINFALL	Total		26.8	mm
	Duration		40	hours
	Number of Days with	0.1 mm or above	4.47
		25.0 mm or above	0.20
		50.0 mm or above	0.07
	Maximum Hourly		51.7	mm	9/12/1931
	Maximum Daily		177.3	mm	2/12/1974
	Maximum Monthly		206.9	mm	1974
NUMBER OF DAYS WITH THUNDERSTORM			0
NUMBER OF DAYS WITH FOG (Visibility < 1000 m)			0.03
SOIL TEMPERATURE AT 0700 HOURS	0.5 m		21.0	deg. C
	1.0 m		22.8	deg. C
BRIGHT SUNSHINE AT KING'S PARK	Duration		172.2	hours
	Percentage of Possible		51	%
WIND AT WAGLAN ISLAND	Prevailing Direction		070	degrees
	Mean Speed		26.0	km/h
	Maximum Gust #		108	km/h	28/12/1991
SEA SURFACE TEMPERATURE AT NORTH POINT AT 0700 HOURS			19.8	deg. C

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

 #  1953 - 2011