A large area of high atmospheric pressure, usually stationary or slow-moving. It is normally associated with widely spaced isobars, resulting in light and variable breezes or calm conditions. Anticyclones often result from the high-level convergence of air, leading to large-scale subsidence, and causing relatively high pressure on the ground. Very cold ground temperatures, such as those recorded over continental Europe and Asia in the winter, can also result in the formation of an anticyclone. As the air above the ground is cooled by conduction, it becomes dense and sinks to the surface. In Great Britain, anticyclones give stable weather conditions with high amounts of sunshine and little precipitation; in summer the weather will often be very warm, but in the winter there may be frosts as heat escapes from the ground surface. Occasionally the low temperatures in the winter may promote condensation, leading to the formation of fog and stratus cloud giving the dull, dreary weather known as anticydonic gloom.