Which climate type is abbreviated Cfb in the Köppen system?

In the Köppen system, Cfb denotes an oceanic climate, also called a marine or maritime climate.

The first letter, C, identifies a temperate climate whose coldest month remains relatively mild. The second letter, f, means there is no pronounced dry season. The final letter, b, indicates warm rather than hot summers: the warmest month averages below 22°C, while at least four months average above 10°C.

Oceanic climates are strongly moderated by nearby seas and oceans. They commonly occur on western continental coasts between roughly 35° and 60° latitude, including much of western Europe, New Zealand, Tasmania, coastal British Columbia, and parts of southern Chile. Frequent cloud, regular rainfall, and limited annual temperature extremes are typical.

Cfb is often confused with Cfc, the subpolar oceanic code, which has cooler summers and only one to three months above 10°C. It is also distinct from Cfa, the humid subtropical code, whose summers are hotter. The label “marine west coast climate” is another common name for the Cfb type.