Similarly to the ratio of days of snow falling to altitude, the number of days in which snow settles on the ground increases by five days per every increase in altitude. In the south-west, it is rare that snow settles on the ground. From 1979 to 2000 on average, lowland areas did not record any lying snow in one out of every three years. During this period, snow settled, on average, fewer than three days per year across the Isles of Scilly and on the coasts of Devon and Cornwall. Inland areas had an average of 5–10 days of snow lying per year and, as with the days of snow falling; this was higher towards the north-east of the region. More than 20 days of snow lying can be expected on the high grounds of Dartmoor and Exmoor.
