According to the Köppen classification the British Isles experience a maritime climate characterised by relatively cool summers and mild winters. Compared with other parts of the country, The Vale of York is slightly warmer and sunnier in the summer and colder and frostier in the winter. Owing to its inland position, and sheltered by the Pennines to the west, North Yorkshire is one of the driest counties in the UK, receiving, on average, around of rain per year. The mean annual daily duration of bright sunshine is three hours and 42 minutes.