Air Mass : A body of air whose temperature and humidity characteristics, acquired in source region, remain relatively constant over a horizontal distance of hundreds to thousands of km. Air masses develop their climatic characteristics by remaining stationary over a source region for a number of days. Air masses are classified according to their temperature and humidity characteristics.
Like the land and sea breezes, the passage of air masses also affects the temperature. The places, which
come under the influence of warm air-masses experience higher temperature and the places that come under the influence of cold airmasses experience low temperature. Similarly,the places located on the coast where the warm ocean currents flow record higher temperature than the places located on the coast where the
cold currents flow.