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Pressures
will not be that low because the temperature is decreasing

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As the overhead sun moves to the s. atmosphere during November to February, the insulation received is low, while as the land’s heat capacity is low, it will lose heat fast; in contrast, the heat capacity of sea is high, so it is retaining more heat than the land.
Therefore, there is a temperature difference between the land and sea, air will move from the high pressure( low temp. ) place to the low pressure( higher temp. )place. In result, a cold wind from the North west will blow from inland to the sea, so called winter monsoon

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The overhead moved to 23.5 degree N during summer, and the Asian landmass will be intensely heated up and create a low pressure cell in the inland.

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Describe the characteristic of AUTUMN
* little rainfall
* warm and dry

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Low pressure settles over the mainland. It draw in warm, moist air from the ocean. Wind are light and from the east and southwest. Air temperatures and relative humidity are uniformly high, with a small daily rang. The mean temperature for July and August is 28.5 degree
This will be the wettest season of all intense rainfall. Typhoons, may occur, bringing heavy rains and strong winds. About 80% of the rain falls in summer

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By October , the overhead sun moves towards the south. Therefore the insulation received in HKdecrease. And the air temperature falls. During this time the summer monsoon weakness and cold, dry air mass begins to develop over the continental interior. Air pressure goes up and the weather is usually fine with little rainfall.

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Offshore monsoon will bring along the moisture of the land out of the landmass causing it to be dry.
As the offshore wind is from the continental interior, it passes through cold places like Nan Ling and Qing Ling, making the wind to be very cool, so this will bring cold and dry weather to HK when it arrives

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During summer, an intense low pressure cell develops over the hot Asian landmass. It is winter in the Southern Hemisphere . Low temperatures from a high pressure cell over northern Australia. During this time, the Pacific Ocean is cooler than the Asian landmass.The air pressure is therefore comparatively higher.

The difference in air pressure causes winds to blow out from the Pacific     ocean and northern Australia to the interior of East Asia. this is the summer monsoon in East Asia and winter monsoon in Australia

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The climate of Hong Kong during winter Dec - Feb is
-low temperature
-low humidity
-have offshore monsoon

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Summer got summer monsoon

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In March-April, it is Spring in Hong Kong. The temperature is getting mild, while the relative humidity and rainfall is getting higher. Foggy weather is also common.
The reason for this climatic characteristic is the overhead sun shift from 23.5S back to the equator, which more insolation will be received in Hong Kong due to the larger angle of sun. Then, the land heat up faster and thus have a higher temperature, which the air rises and have a lower air pressure. However, the ocean absorb heat slower and have a cooler temperature, which has higher air pressure. Thus, wind are blown from ocean to land(onshore wind), which is full of moisture that favour formation of  rainfall in Hong Kong.
On the other hand, Hong Kong is still affected by the winter monsoon( but weaker). Since the air in the Pacific Ocean is getting warmer, when the cool air mass and warm air mass met in HK, the warm air condense and form foggy weather.

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FYI