If raining lunchtime, (I'll remain indoors. )
Or
If it's raining at lunchtime time, (I'll remain indoors.)
(when you know it may rain)
Or
If it rains lunchtime, (I'll remain indoors. )
(when you're not sure it's going to rain)
Hope this helps!
Explanation:
Chase is not an effective speaker because he is not confident about his idea and he comes prepared to share.
It may be a hyperbole because it is exaggeration, it is not true there was absolutely nowhere to go, and nothing to buy, and no money to buy it with, and nothing to see outside the boundaries of Maycomb County.