What term describes the long-term average weather conditions in Mississippi?

The term that describes the long-term average weather conditions in Mississippi is climate. Climate refers to the aggregate of weather conditions in a particular region over extended periods, typically 30 years or more. This includes average temperatures, precipitation patterns, humidity, and seasonal changes that define the overall environment of an area.

In this context, while "forecast" pertains to predictions about future weather conditions—usually on a short-term basis—the term "weather" refers to the day-to-day state of the atmosphere, such as temperature, humidity, and precipitation at a specific time. "Atmosphere" simply denotes the layer of gases surrounding Earth and is not specifically related to weather patterns or averages over time. Thus, climate is the most accurate term to describe the long-term weather trends and averages experienced in Mississippi.