The data or information that should be plotted on the x-axis of a bar graph is the month.
In Mathematics and Euclidean Geometry, a bar graph is a type of graph that is used for the graphical representation of a data set, especially through the use of rectangular bars and vertical columns.
In Mathematics, an independent variable is a type of variable that does not depend on any other variable for its value.
Based on the table of values, we can reasonably infer and logically deduce that the month is an independent variable, and it should be plotted on the x-axis of the bar graph while the Average Average (°F) or Temperature Precipitation (in) should be plotted on the y-axis of a bar graph.