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Climatological Information Services > Statistics of Special Weather Events > Number of hours of Reduced Visibility (Hong Kong International Airport)

Number of hours of Reduced Visibility observed at
the Hong Kong International Airport since 1997

(criteria: visibility below 8 kilometres, relative humidity < 95%, no fog, mist, or precipitation)

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Total
1997802452140442015996616356201960
19981568417952322411011334108158951
199926981127633223265486961631221142
2000144130143372363310321994228899
2001951188367681810811148596130965
200217096291241430631004356171815
200331013976697131022221251612911317
20041971631151037992251431582652914402071
200547613115319814921421952052192761939
2006305273180713594392814822932872151
2007427194102161158160812382991714202267
200822631626517297132961862301282831951
2009251137133148178581492481412661484
201023993154108282102141182171721112
2011376201183761141125662966852061438
2012223120615572775751175988826
201336367519825201926111803181160
201423158597511171403481108115803
201517220972162081432654101677
2016869088161012745282589487
201781345084604826    
Mean
(1997 - 2016)
239.8136.2115.2 86.8 45.4 17.6 14.7 48.4 81.2137.1130.2218.11270.8
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Total

Absolute Maximum in red colour
Column's Maximum in yellow background colour

-The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend.

-Before 10 October 2007, the number of hours of reduced visibility at the Hong Kong International Airport in 2005 and thereafter displayed in this web page was based on hourly visibility observations by professional meteorological observers. Since 10 October 2007, the data have been revised using the average visibility readings over the 10-minute period before the clock hour, as recorded by the visibility meter near the middle of the south runway.

Fig 1
Fig 1. Annual total number of hours of Reduced Visibility observed at the Hong Kong International Airport (1997 - 2016 )
Fig 2
Fig 2. Monthly mean number of hours of Reduced Visibility observed at the Hong Kong International Airport (1997 - 2016 )