Monthly Normals of Meteorological Elements for October 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		1024.5	hPa	23/10/1888
	Mean		1014.1	hPa
	Absolute Minimum		977.3	hPa	13/10/1964
	Mean Diurnal Range		3.6	hPa
AIR TEMPERATURE	Absolute Maximum		34.3	deg. C	12/10/1890
	Mean Daily Maximum		27.8	deg. C
	Mean		25.5	deg. C
	Mean Daily Minimum		23.7	deg. C
	Absolute Minimum		13.5	deg. C	30/10/1978
RELATIVE HUMIDITY	Mean		73	%
	Absolute Minimum		21	%	25/10/1968 28/10/1973 27/10/1991 28/10/1991 17/10/1998
AMOUNT OF CLOUD			58	%
RAINFALL	Total		100.9	mm
	Duration		46	hours
	Number of Days with	0.1 mm or above	7.43
		25.0 mm or above	1.20
		50.0 mm or above	0.70
	Maximum Hourly		71.6	mm	31/10/1923
	Maximum Daily		292.2	mm	31/10/1923
	Maximum Monthly		718.4	mm	1974
NUMBER OF DAYS WITH THUNDERSTORM			0.53
NUMBER OF DAYS WITH FOG (Visibility < 1000 m)			0
SOIL TEMPERATURE AT 0700 HOURS	0.5 m		27.8	deg. C
	1.0 m		28.1	deg. C
BRIGHT SUNSHINE AT KING'S PARK	Duration		193.9	hours
	Percentage of Possible		54	%
WIND AT WAGLAN ISLAND	Prevailing Direction		080	degrees
	Mean Speed		27.4	km/h
	Maximum Gust #		184	km/h	13/10/1964
SEA SURFACE TEMPERATURE AT NORTH POINT AT 0700 HOURS			26.3	deg. C

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

 #  1953 - 2011