Lists of mountains and hills in the British Isles in England, 366 in Wales and 11 in the Channel Islands. A Simm is a mountain the British Isles that is over high and has a prominence of at least . The word comes from Six-hundred Metre Mountain. There are currently 2,754 recorded Simms in the British Isles, including 2,188 Scottish Simms, 192 English Simms, 149 Welsh Simms, 1 Isle of Man Simm, and 224 Irish Simms. By definition, all Simms are also TuMPs (see below) and most, if not all, are mountains, depending on whether 600 metres or 2,000 feet (610 m) (e.g. a ), is used as the
Climate of the British Isles is most common during the summer months. Each of the United Kingdom's 50 strongest hailstorms on record since 1650 have occurred between the months of May and September. The prevailing winds over the British Isles are from the south-west, and winds are strongest on coasts that face the Atlantic. Generally, the coast tends to be windier than inland areas; and the west tends to be windier than the east. Gales — which are defined as winds with speeds of — are strongly associated with the passage of deep depressions across the area. The Hebrides experience on average 35 days of