Summary of Meteorological and Tidal
Observations in Hong Kong

Year	File	File size
1999 *		6,725k
2000 *		9,307k
2001 *		4,176k
2002 *		2,184k
2003 *		2,574k
2004 *		2,906k
2005 *		3,024k
2006		3,880k
2007		7,837k
2008		6,407k
2009		5,677k
2010		3,361k

1. 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.

2. 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.

3. The calibration factors of the pyranometer at King's Park in 2006 and 2007 have been re-computed based on the results of a regional instrument comparison in Asia in 2007. The readings of total global solar radiation at King's Park in 2006 and 2007 displayed in this web page before 13 June 2008 have been revised on 13 June 2008 using the new calibration factors.

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* This publication was titled as "Summary of Meteorological Observations in Hong Kong" before 2006