Crossword Genius

Line on a map linking places of equal temperature (8)

Ross

I believe the answer is:

isotherm

(Other definitions for isotherm that I've seen before include "Curve of equal temperatures" , "that's charted to a degree" , "meteorological line" , "Line joining equally hot spots" , "Line joining places of equal temperature" .)

I've seen this clue in The Mirror and The Independent.
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