Why do Jem and Scout make a snowman of Mr. Avery in To Kill a Mockingbird?

In Chapter 8, it snows in Maycomb County, which is an unusual, rare event. Jem and Scout are excited at their first opportunity to create a snowman. Despite the lack of snow, Jem and Scout begin to gather snow from Miss Maudie's yard and mix it with dirt in order to build a snowman. As they are building their snowman, Scout comments that the snowman looks a little like Miss Crawford. Jem senses an opportunity to create a snowman that resembles one of their neighbors and gathers more snow to make its stomach fatter. Jem says to Scout, "Mr. Avery's sort of shaped like a snow man, ain't he?" (Lee 42). After successfully creating a snowman that resembles Mr. Avery, Atticus tells Jem to add an apron to disguise it. One reason why Jem decided to make the snowman resemble Mr. Avery is because Mr. Avery has a rather humorous appearance which is easy to replicate in a snowman.