Monthly Normals of Meteorological Elements for January 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		1035.4	hPa	6/1/1903
	Mean		1020.3	hPa
	Absolute Minimum		1003.1	hPa	29/1/1980
	Mean Diurnal Range		4.1	hPa
AIR TEMPERATURE	Absolute Maximum		26.9	deg. C	29/1/1959
	Mean Daily Maximum		18.6	deg. C
	Mean		16.3	deg. C
	Mean Daily Minimum		14.5	deg. C
	Absolute Minimum		0.0	deg. C	18/1/1893
RELATIVE HUMIDITY	Mean		74	%
	Absolute Minimum		10	%	16/1/1959
AMOUNT OF CLOUD			61	%
RAINFALL	Total		24.7	mm
	Duration		46	hours
	Number of Days with	0.1 mm or above	5.37
		25.0 mm or above	0.23
		50.0 mm or above	0.00
	Maximum Hourly		21.8	mm	3/1/1956
	Maximum Daily		99.8	mm	26/1/1887
	Maximum Monthly		214.3	mm	1887
NUMBER OF DAYS WITH THUNDERSTORM			0.13
NUMBER OF DAYS WITH FOG (Visibility < 1000 m)			0.30
SOIL TEMPERATURE AT 0700 HOURS	0.5 m		18.8	deg. C
	1.0 m		20.3	deg. C
BRIGHT SUNSHINE AT KING'S PARK	Duration		143.0	hours
	Percentage of Possible		42	%
WIND AT WAGLAN ISLAND	Prevailing Direction		060	degrees
	Mean Speed		25.3	km/h
	Maximum Gust #		103	km/h	15/1/1955
SEA SURFACE TEMPERATURE AT NORTH POINT AT 0700 HOURS			17.4	deg. C

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

 #  1953 - 2011