1. of or relating to a line on a map connecting points that receive equal amounts of rainfall over a given period
Usage: technical; meteorology and geography

Examples

• The meteorologist drew isohyetal lines on the weather map to show rainfall distribution.
• Isohyetal maps help farmers understand which regions receive similar precipitation.
• The isohyetal analysis revealed that coastal areas received more rain than inland regions.
• Climate scientists use isohyetal data to study long-term precipitation patterns.
• The isohyetal map displayed a clear gradient from wet to dry zones across the continent.