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the year, relatively clear months like July and August might also be problematic since the middle of the year was the rainy season. Air power, one of the Allies' biggest assets, might not realize its full potential over Hong Kong.
Another factor in which the Allies were much better endowed than their opponents was artillery, including naval gunfire. The latter had been, and would continue to be, invaluable in pulverising land targets before the actual amphibious landings. But naval and land-based artillery were very dependent on aerial and ground observers to achieve accuracy. If these were limited by cloud and fog, enemy targets would be inadequately softened up or even missed, thereby leaving more of the work to the ground forces. Then the role of Hong Kong's ubiquitous mountains would become even more prominent. Even on a good day, artillery cannot completely neutralise an enemy who is well dug into a mountain. But it can still keep the enemy pinned down, making it hard for him to shoot back or launch counterattacks. A deficiency or absence of artillery and aerial support brought about by cloud and fog provides the enemy with a chance to come out and pull off a few surprises, especially an enemy who lives by the sneak attack like the Japanese.
Conversely, barrage balloons benefit from low ceilings because they could hide in the overcast sky, with only their thin wires exposed, and wait for unsuspecting enemy aircraft that may be flying low. Barrage balloons could be worthy supplements to the progressively effective Allied combat air patrol (CAP), which was a constant umbrella of aircraft patrolling the skies over any Allied position. When the CAP is limited by cloud and fog, barrage balloons can partially fill the void. The winter months in Hong Kong (the beginning of the year) were generally the best time to employ barrage balloons.
Temperature and humidity
Hong Kong's temperatures only go in one extreme - upwards. Even during winter, they almost never approach freezing (32°F/0°C). February, Hong Kong's coldest month, averages a tolerable 59°F (15°C) Certainly Hong Kong would not be mistaken for the Soviet Union or Alaska.
But the mid-spring to summer months (April to September) would