The United Kingdom has a temperate maritime climate shaped by the Atlantic Ocean, with mild winters, cool to warm summers, frequent cloud cover, and highly changeable weather. Most of the country is classified as Köppen Cfb (temperate oceanic), while the far north and the highest uplands shift toward cooler oceanic and subpolar oceanic conditions. Rainfall is spread through the year, but western areas are much wetter than eastern ones because prevailing westerly winds carry moist Atlantic air inland. For residents and expats, the climate is generally comfortable for moderate temperatures, though sunshine is limited compared with southern Europe and wind exposure can be significant.