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Africa. History has shown that the weather, a factor that most folks accept as a part of daily life, has helped decide the outcome of a few military campaigns.
Hong Kong's climate was not as extreme as that of the Soviet Union or North Africa, but it could be a potential nuisance or menace to opponents battling for its control. Up to this time (1943), it had not shown itself to be a factor during the two most recent times Hong Kong changed hands in 1841 and 1941. If the Allies returned to reclaim Hong Kong by force, they would likely be deprived of such a walkover.
Usually, the weather favours the defender, because he should have a greater degree of familiarity with his stronghold and probably be more entrenched against the invader and the weather. Although Hong Kong had been British territory for 100 years before the war, Japanese knowledge of Hong Kong was fresher because they were in control of it. Allied knowledge of Hong Kong's weather was an inadequate substitute for actually being in Hong Kong. Things were certain to change in the territory after the British were kicked out, and they did.
Factors to consider
Hong Kong's collection of unfavourable weather included rainfall, cloud and fog, temperature, humidity, and winds. All of these factors had already been experienced by the Allies elsewhere. If they considered the control of a specific territory to be crucial, then they would do just about anything to obtain it. Therefore, any objective's weather could be no more than a secondary factor. Simply put, if an objective is chosen, the rationalisation would be that it was chosen regardless of its weather - because the advantages of having it outweighed the potential disadvantages posed by the weather or any other factor. Its weather would be played down, and the attackers would be prepared to suffer the consequences of trying to take it. On the other hand, if an objective is rejected, its weather could be played up (especially if it was potentially violent) as a cause for the rejection.
Rainfall
Hong Kong received an average annual total of 85 inches (2,159 mm) of precipitation, with the bulk of this amount falling in the middle
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