In chapter eight, Maycomb experiences its coldest weather since 1885, which surprises the entire community. Mr. Avery had told the children that it was written on the Rosetta Stone that when children disobeyed their parents, smoked cigarettes, made war on each other, the seasons would change. He implies that Jem and Scout are responsible for the bad weather. Scout mentions,
Jem and I were burdened with the guilt of contributing to the aberrations of nature, thereby causing unhappiness to our neighbors and discomfort to ourselves. (Lee, 65)
The children naively believe Mr. Avery's superstitious comment and are burdened with the guilt of causing the unfavorably cold weather. Jem and Scout are too young and naive to realize that Mr. Avery is not telling the truth, and they believe that their bad behavior has caused the cold weather.
It becomes so cold in Maycomb that it eventually snows. The following day after the snowfall, school is canceled and the children proceed to build a snowman out of mud and snow. Jem ends up constructing the snowman to resemble Mr. Avery and Atticus forces him to alter its design.