A long-term average (minimum 30 years) of weather conditions at a place. For example, some climates are hot and wet all year (Singapore); some have hot, wet summers and warm, dry winters (Darwin); and some have warm, dry summers and cool, wet winters (Adelaide and Perth). Climates can be classified into distinctive types, such as equatorial, tropical, temperate, Mediterranean, semi-arid and arid. These types are found in similar locations around the world.