 Mountain snow covering has also been known to occur during the other seasons.During the 20th century, the city itself has received snowfalls at sea level on average only once every 15 years; however, outer suburbs lying higher on the slopes of Mount Wellington receive snow more often, owing to cold air masses arriving from Antarctica coupled with them resting at higher altitude.These snow-bearing winds often carry on through Tasmania and Victoria to the Snowy Mountains in northern Victoria and southern New South Wales.