Based on the typical patterns of average rainfall from June to December:
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June to August: In many regions, especially in the tropics and subtropical areas, rainfall tends to be higher during the summer months, so you may expect to see an increase in average rainfall during this period.
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September to November: Depending on the location, rainfall can often peak in September and then start to decrease in October and November as fall approaches.
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December: The decrease in rainfall might continue into December or could stabilize, depending on the specific climate patterns of the region.
So, if we analyze the general trends, the average rainfall typically increases then decreases during these months.
Given these typical patterns, the most accurate response would be:
the average rainfall increases then decreases.