This report describes the typical weather at the Hong Kong International Airport (Chek Lap Kok, Hong Kong) weather station over the course of an average year. It is based on the historical records from 2006 to 2012. Earlier records are either unavailable or unreliable.
Chek Lap Kok has a warm temperate climate with dry winters and hot summers. The area within 25 mi of this station is covered by oceans and seas (67%), croplands (16%), grasslands (6%), forests (6%), and shrublands (5%).
Over the course of a year, the temperature typically varies from 56°F to 91°F and is rarely below 50°F or above 94°F.
The warm season lasts from May 26 to October 10 with an average daily high temperature above 86°F. The hottest day of the year is July 28, with an average high of 91°F and low of 82°F.
The cold season lasts from December 18 to February 24 with an average daily high temperature below 69°F. The coldest day of the year is January 21, with an average low of 56°F and high of 64°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 10:46 hours of daylight; the longest day is June 20 with 13:30 hours of daylight.
The earliest sunrise is at 5:38am on June 5 and the latest sunset is at 7:12pm on July 6. The latest sunrise is at 7:05am on January 15 and the earliest sunset is at 5:38pm on November 29.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 44% (partly cloudy) to 67% (partly cloudy). The sky is cloudiest on March 30 and clearest on August 1. The clearer part of the year begins around June 1. The cloudier part of the year begins around December 28.
On August 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 76% of the time, and overcast or mostly cloudy 24% of the time.
On March 30, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 70% of the time, and clear or mostly clear 16% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around June 19, occurring in 65% of days. Precipitation is least likely around November 22, occurring in 18% of days.
Over the entire year, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 50% of those days with precipitation. It is most likely around March 15, when it is observed during 30% of all days.
Thunderstorms are the most severe precipitation observed during 21% of those days with precipitation. They are most likely around August 10, when it is observed during 24% of all days.
Moderate rain is the most severe precipitation observed during 19% of those days with precipitation. It is most likely around June 20, when it is observed during 15% of all days.
During the warm season, which lasts from May 26 to October 10, there is a 54% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (34% of days with precipitation have at worst light rain), thunderstorms (34%), moderate rain (20%), and heavy rain (12%).
During the cold season, which lasts from December 18 to February 24, there is a 29% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (75% of days with precipitation have at worst light rain), moderate rain (15%), and drizzle (7%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 47% (comfortable) to 89% (very humid) over the course of the year, rarely dropping below 30% (comfortable) and reaching as high as 95% (very humid).
The air is driest around December 1, at which time the relative humidity drops below 55% (mildly humid) three days out of four; it is most humid around June 19, exceeding 86% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 42°F (dry) to 79°F (oppressive) and is rarely below 29°F (dry) or above 80°F (very oppressive).
There are two periods in the year that are most comfortable: The first is between January 1 and April 3 and the second is between November 5 and December 31. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 3 mph to 19 mph (light air to fresh breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 12 mph (gentle breeze) occurs around April 19, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around August 25, at which time the average daily maximum wind speed is 15 mph (moderate breeze).