Why is it sultry in summer and dry in winter?

When it rains, due to the prevailing updraft, the ground forms a low pressure. On sunny days, the atmosphere is dominated by downdraft, and high pressure is formed near the ground. In winter, the atmosphere sinks due to cold, forming high pressure near the ground, which is not easy to cause rainfall by clouds, and precipitation is scarce. In summer, the air flow heats up and forms a low pressure near the ground. Clouds are easy to cause rainfall, which is abundant.

However, it should be noted that the above analysis refers to the general situation, if it doesn't rain or sunny on that day, or if it doesn't rain or sunny on the same day, it has no comparative significance. If it is not the air pressure of the day, the air pressure on a sunny day is not necessarily greater than that on a rainy day.

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