Hot belt

From Glossary of Meteorology

hot belt

As presented by A. Supan (1879), the belt around the earth within which the annual mean temperature exceeds 20°C.

He also defined a temperate belt and cold cap.
See climatic classification.

Supan, A. 1879. Die Temperaturzonen der Erde. Petermanns Geog. Mitt.. 25. 349–358.