What is the name of a line that connects points with equal total rainfall?

The term that describes a line connecting points with equal total rainfall is called an isohyet. This type of line is specifically used in meteorology to represent areas that receive the same amount of precipitation over a specified period. Isohyets provide valuable information for understanding rainfall patterns and are essential for various applications, such as agriculture, water resource management, and climatology.

The other terms are related but serve different purposes. An isotherm connects points of equal temperature, an isoline is a more general term that can refer to any line connecting points of equal value for a certain variable (not necessarily rainfall), and an isobar indicates points of equal atmospheric pressure. Thus, isohyet is the precise term that directly pertains to rainfall measurements.