What does Mr. Avery say that bad children cause? What's ironic about this, give Jem and Scout's reaction to the snow?

Winter arrives in Maycomb and it is unexpectedly harsh. Mr. Avery blames the children for causing the bad weather, saying that disobedient children make the seasons change. This is ironic because the children's initial reaction is fear (Scout) and curiosity (Jem). Scout says, "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."