Vietnamese here, many people talked about how the tropics have wet and dry season, but didn’t explain why.
The reason is in fact due to the normal four seasons that temperate regions experience. Take a look at [this diagram](https://scijinks.gov/what-is-a-monsoon/monsoon-conditions.jpg) to see how the monsoon air current flows. When it’s summer in the north, the circular flow results in moist air blown into land from the sea, resulting in rain season in the tropics. Vice versa, the tropics experience dry season during winter.
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