Average Annual Sunshine in American Cities

Ireland normally gets between 1100 and 1600 hours of sunshine each year. The sunniest months are May and June. During these months, sunshine duration averages between 5 and 6.5 hours per day over most of the country. The extreme southeast gets most sunshine, averaging over 7 hours a day in early summer. December is the dullest month, with an average daily sunshine ranging from about 1 hour in the north to almost 2 hours in the extreme southeast. Over the year as a whole, most areas get an average of between 3 1/4 and 3 3/4 hours of sunshine each day. 1887 was the sunniest summer in the 100 years from 1881 to 1980, according to measurements made at the Phoenix Park in Dublin. A more recent summer, 1980, was the dullest.

Average daily sunshine hours by month in recent years are shown in the graph and table below:

Sunshine has varied markedly across the country. Despite being so wet, south England has seen 12% more sunshine than average, while Scotland has only seen 78% of its average sunshine hours.

Average Daily Sunshine Hours: London

By contrast, August was dry and mild, and with about average sunshine.

The maximum amount of sunshine in a calendar month was 329 hours in in May 1946 and again in May 1975 while the minimum, a mere 36 minutes, was recorded at Cape Wrath in the Highlands in January 1983. is the sunniest city in Scotland.[] On the there is no complete darkness over the northern isles of Scotland. , , has about four hours more daylight at midsummer than , although this is reversed in midwinter. Annual average sunshine totals vary from as little as 711–1140 hours in the highlands and the north-west, up to 1471–1540 hours on the extreme eastern and south-western coasts. Average annual sunshine hours over the whole territory are 1160 (taking 1971 to 2000 as standard) meaning that the sun shines just over 25% of the time.