1. Lines on a map connecting points of equal mean summer temperature.
Usage: plural of isotherm (summer variant); technical/geographical term; used in climatology and meteorology

Examples

• The isotheres on the climate map showed that coastal regions had cooler summers than inland areas.
• Meteorologists use isotheres to identify regions with similar summer temperature patterns.
• The isotheres revealed a clear temperature gradient from north to south across the continent.
• By comparing isotheres across different decades, scientists can track changes in summer climate.
• The isotheres helped geographers classify the region's summer climate zone.