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

Number of hours of Reduced Visibility observed at
the Hong Kong Observatory since 1968

(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
19681596153200340011158
1969464810110979032005330
19703754698137501800114316
19711521616530066016184
1972595533322920104010225
19731938656221001000188
19741270253020013015149
1975742603521012304157
197664528514600000017193
1977444898121111000013228
1978335987791761000010292
19797248581084331505045388
19805862108833637221511378
19812768103385016313017299
198242781094627173232401352
19832428279519301771048269
1984613558715240832013307
19856966666871807210015328
19864423434227315530138280
1987335046311230004345227
198859305545260008202428295
1989605326561025036252685411
199034485528121401680950274
1991487377643125892001967495
19925941715448308321121115463
19932713462574855357921034498
199419265794850751300620503
1995783249913181022853887459
19961123649483002911288539114581
199714551125124542918844411553132974
199811032103459160512198287619
19991588681364727255446910540750
200014496129593801458182389623
20011107981887513831104794118727
20021281028041461034631026143118828
200322813615697942607211141091291117
2004218168981807761271291382231021491570
20053509410823726142368163160172871502
200623017313813230131624125090791257
2007148906811513016162152173383051298
2008107168173123542311127154581021100
200911013011216539998220184841951139
2010191891761091132005158581911691225
20112721902071591012636506672751451399
201219393548314221014435916385887
201321495102112541038187653215978
201414849124111417190     
Normal
(1971 - 2000)
61.7 53.8 67.9 56.8 24.3 6.5 3.5 17.6 15.6 15.2 15.7 41.2379.6
Normal
(1981 - 2010)
111.5 78.5 86.8 81.1 40.7 11.6 8.6 35.6 46.0 62.8 46.6 82.5692.3
Mean
(1968 - 2013)
96.7 72.4 83.0 78.0 35.4 9.3 6.8 29.1 33.0 46.7 34.6 66.6 591.7
Mean
(1968 - 2014)
97.8 71.9 83.9 78.7 34.7 9.5 7.1 28.5     
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

Annual total number of hours of Reduced Visibility observed
Fig 1. Annual total number of hours of Reduced Visibility observed at the Hong Kong Observatory
Monthly mean number of hours of Reduced Visibility observed
Fig 2. Monthly mean number of hours of Reduced Visibility observed at the Hong Kong Observatory (1981 - 2010 )

Last revision date: <01 Sep 2014>