What Is the Difference Between Isobars and Isotherms?

By Staff WriterLast Updated Apr 14, 2020 8:33:13 AM ET

On a weather map, isobars are contour lines that connect different locations or points with the same constant pressure, while isotherms are also contour lines, which specify locations that are at the same constant temperature. The spacing between temperature contour lines are typically given in 10-degree Fahrenheit intervals. Isobar contour lines are drawn with a spacing of 4 millibars.