Main Page | See live article | Alphabetical index An isohume is a line of equal or constant humidity on a graph, plot, or map; an isopleth of humidity. For example, isohumes are commonly seen on weather maps to show large-scale humidity distributions. External Links Drawing Contour Plots. A lesson plan that deals with drawing various isopleths including isohumes. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.