Scotland Climate

Scotland has a temperate oceanic climate, milder than might be expected from its latitude. Despite its small area, there are considerable variations. Precipitation is greatest in the mountainous areas of the west, as prevailing winds, laden with moisture from the Atlantic, blow from the southwest. East winds are common in winter and spring, when cold, dry continental air masses envelop the east coast. Hence, the west tends to be milder in winter, with less frost and with snow seldom lying long at lower elevations, but it is damper and cloudier than the east in summer. Tiree, in the Inner Hebrides off the west coast, has a mean temperature in winter of 41 °F (5 °C) in the coldest month (as high as southeastern England), whereas Dundee, on the east coast, has 37 °F (3 °C). Dundee’s mean temperature in the warmest month is 59 °F (15 °C) and Tiree’s 57 °F (14 °C). There is a smaller range of temperatures over the year in Scotland than in southern England. Precipitation varies remarkably. Some two-thirds of Scotland receives more than 40 inches (1,000 mm) annually, the average for Britain, with the total reaching 142 inches (3,600 mm) in the Ben Nevis area and somewhat more near Loch Quoich farther to the northwest. In the flat Outer Hebrides conditions are less humid, as in the east, where the Moray Firth receives annually less than 25 inches (635 mm) and Dundee less than 32 inches (810 mm). A significant amount of snow falls above 1,500 feet (460 metres) in the Highlands in winter.