What effect do the ocean currents have on the climate of a place?

Ocean currents closely affect factors, like temperature, pressure, winds and precipitation, that decide the climate of a place. Following are the effects of current on the climate of a place:

1. Wind passing over the warm current pick up the moisture and bring rain to the adjoining areas. For example, British Columbia, British Isles and Japan get extra rain because of warm current. Eastern margins of Australia and Africa have heavy rainfall.
2. Winds passing over cold currents do not rain. For example, Kalahari and Atacama desert are drier because of cold currents.
3. The cold current bring elongated winter season. For example, Labrador currents bring nearly nine months of winter and bad weather in Labrador.
4. The eastern part of ocean in lower latitudes record relatively low temperature making the climate cold and foggy.