Subtropical (or semitropical) areas are those adjacent to the tropics, usually roughly defined as the ranges 25-40° N and 25-40° S latitude. These areas typically have hot tropical summers, but non-tropical winters.
In Köppen's scheme of climate classification, subtropical climates (Cfa, Cwa) are a subtype of temperate climates. They have an average temperature above 22 °C (50 °F) in their warmest months, a coldest month average between -3 °C and 18 °C, and wet, humid summers with driest winter month average precipitation greater than one-tenth wettest summer month average precipitation.