The phrase "normal monthly" can be replaced with several synonyms depending on the context in which it is used. For example, "typical monthly" can be used to describe a regular occurrence in a specific period. Alternatively, "standard monthly" can be used to suggest a defined level or expectation. "Ordinary monthly" is used to indicate a regular or routine occurrence. Other potential synonyms include "expected monthly," "usual monthly" or "conventional monthly." Each of these synonyms can be used interchangeably to convey a similar idea or concept in different contexts. Ultimately, the choice of synonym will depend on the writer's preference and intended meaning.