The United Kingdom straddles the geographic mid-latitudes between 49 and 61 N. It is on the western seaboard of Afro-Eurasia, the world's largest land mass. These conditions allow convergence between moist maritime air and dry continental air. In this area, the large temperature variation creates atmospheric instability and this is a major factor that influences the often unsettled weather the country experiences, where many types of weather can be experienced in a single day.