In Meteorology, Line Joining Places of Equal Temps

This page is the CodyCross answer for the clue below from African grasslands, Group 1553, Puzzle 5 (Conservation).

Question is: In Meteorology, Line Joining Places of Equal Temps

and the answer is: ISOTHERM

Word Meaning:

ISOTHERM — A line on a graph or chart, such as a weather map, along which all the points have the same temperature.

Definitions from Wiktionary.