Wicklow's climate, like that of most of Ireland, is dominated by the Atlantic Ocean. Mild damp summers and cool wet winters are the normal fare but the weather patterns are ever changing and never totally predictable.
Winter months are generally the wettest and June and July the driest. Annual rainfall reaches 2000mm on the highest summits but can be less than half of that total at the coast. Wicklow's position near the south east corner of Ireland gives it a relatively high incidence of bright sunshine, averaging about 4 hours a day over the entire year. Snow cover in winter increases with altitude and can reach an average of 30 days a year on some of the highest peaks.
Wind is an important feature, especially on the higher hills where tree growth is often limited. Dominant wind directions are from the south and west, however there are times each year when an easterly airflow brings both snow and ice from the European continent. This unending drama of weather is a factor that makes any day in Wicklow a 'unique' day.