What term describes lines that connect areas of equal rainfall?

The term that describes lines connecting areas of equal rainfall is "Isohyets." These lines are used in meteorology and climatology to visually represent the distribution of precipitation over a specific area on a map. By drawing isohyets, one can easily see patterns of rainfall, which is crucial for understanding climate, agricultural planning, and water resource management.

Contour lines, on the other hand, are used to connect points of equal elevation above sea level, primarily representing terrain on topographic maps. Isotherms connect points of equal temperature, illustrating temperature variations rather than precipitation. Topographic lines refer to the lines that also show landforms but are synonymous with contour lines; they do not relate to rainfall measurement. Therefore, "Isohyets" is the precise term for lines that depict areas with the same amount of rainfall.