Isothermal maps give information about temperature.
Isothermal maps are maps that display areas with the same temperature. They are used to show temperature variations across a particular region. These maps can be used to identify areas that are experiencing hot or cold temperatures, and to observe the movement of these temperature patterns over time. Isothermal maps are commonly used in meteorology and climate science to track the movement of air masses and the formation of weather patterns.
Therefore, the correct answer is "temperature".