To analyze the average rainfall from June to December based on the provided points:
- June: 0.2 inches
- July: 0.45 inches
- August: 0.55 inches
- September: 0.7 inches
- October: 1.6 inches
- November: 2.4 inches
- December: 3.2 inches
From June to July, the average rainfall increases from 0.2 inches to 0.45 inches.
From July to August, it increases slightly from 0.45 inches to 0.55 inches.
From August to September, it increases from 0.55 inches to 0.7 inches.
From September to October, there is a notable increase from 0.7 inches to 1.6 inches.
From October to November, it rises from 1.6 inches to 2.4 inches.
Finally, from November to December, it increases from 2.4 inches to 3.2 inches.
Therefore, throughout the months from June to December, the average rainfall shows a consistent increase.
Thus, the correct response is: the average rainfall increases.