What Is A Subtropical Region?

A subtropical region refers to the zones of the Earth that are immediately to the north and south of the tropic zones, bounded by the Tropic of Cancer and Tropic of Capricorn. They are at latitude of 23.5 degrees north and south. The subtropical region loosely lies in a range between 23.5 and 35 degrees. These areas usually experience very warm to hot summers. The winters are non tropical though. The air temperature of a subtropical region does not go below the freezing point (0 degrees). For example southern Florida, northern India, coastal California, coastal South Africa and coastal Australia fall under subtropical region. Subtropical cities include Brisbane, Sydney, Los Angeles, Mexico City, Athens and New Delhi. Subtropical regions usually do not have distinctly dry or wet seasons.

the sub tropical region(23.5  to 35  n/s latttitude) can be called as the warmest region  of the temperate zone

The term 'subtropical' is an adjective that is used for the things that belong to sub-tropic and it is sub-tropic that describes a kind of region that is a latitudinal one and can be located between 23.5 degree and 34.0 degree in either of the hemisphere. The zone is at the border of the tropical zone. The area of sub-tropic is considered to be semi-permanent high-pressure zone and it is in this area where North Pacific Highs can be found.

The adjective term can be used for anything that belongs to it and climate is the prime among them. As it is climate that decides what kind of organisms or vegetation that can be grown in a particular area, you can also use the term sub-tropical for these things.