Climate

Overall, Ireland has a mild, but changeable, Oceanic climate with few extremes. The warmest recorded air temperature was 33.3 °C (91.94 °F) at Kilkenny Castle, County Kilkenny on 26 June 1887, where as the lowest recorded temperature was −19.1 °C (−2.38 °F) at Markree Castle, County Sligo on 16 January 1881.^[20]

Other statistics show that the greatest recorded annual rainfall was 3,964.9 mm (156.1 in) in the Ballaghbeena Gap in 1960. The driest year on record was 1887, with only 356.6 mm (14.0 in) of rain recorded at Glasnevin, while the longest period of absolute drought was in Limerick where there was no recorded rainfall over 38 days during April and May of 1938.^[21]

The climate is typically insular, and as a result of the moderating moist winds which ordinarily prevail from the South-Western Atlantic, it is temperate, avoiding the extremes in temperature of many other areas in the world at similar latitudes.

Precipitation falls throughout the year, but is light overall, particularly in the east. The west, however, tends to be wetter on average and prone to the full force of Atlantic storms, more especially in the late autumn and winter months, which occasionally bring destructive winds and high rainfall totals to these areas, as well as snow and hail. The regions of North Galway and East Mayo have the highest incidents of recorded lightning annually (5 to 10 days per year).^[22] Munster in the south records the least snow with Ulster in the north more prone to snow. Some areas along the south and southwest coasts have not had any lying snow since February 1991.

Inland areas are warmer in summer, and colder in winter – there are usually around 40 days of below freezing temperatures (0 °C/32 °F) at inland weather stations, but only 10 days at coastal stations. Ireland is sometimes affected by heat waves, most recently 1995, 2003, 2006.