What does the term 'isotherms' refer to in meteorology?

Isotherms are lines drawn on a weather map that connect points of equal temperature, making the correct choice the reference to lines joining places of equal temperature. These lines help meteorologists visualize temperature distributions across regions, facilitating the analysis of weather patterns and helping to understand how temperature varies over a geographical area.

When isotherms are closely spaced, they indicate a steep temperature gradient, which can suggest more intense weather phenomena, such as fronts. Conversely, widely spaced isotherms indicate a more stable temperature environment. This understanding of temperature distribution is fundamental in meteorology, as it aids in predicting weather changes and patterns.

The other terms mentioned in the incorrect options relate to different meteorological concepts. For instance, lines that connect points of equal humidity refer to isohyets, while wind patterns are represented by isobaric lines or streamlines. Similarly, precipitation areas would be mapped using different methods that indicate rainfall distribution rather than temperature. Thus, the focus on temperature makes the definition of isotherms particularly important in the study of meteorological phenomena.