Verified monthly total sunshine hours from Armagh Observatory (raw data), 1880-2001 (hours) Note incomplete coverage in some months before 1886 (see Table 2 of paper for details) Year Jan Feb March April May June July August Sept. Oct. Nov. Dec. Annual 1880 -888 -888 -888 -888 222.8 169.3 145.3 171.0 131.9 104.8 58.6 52.2 1140.2 1881 57.1 42.8 102.1 155.6 235.4 160.8 117.6 137.4 82.3 115.0 76.2 61.8 1344.1 1882 44.4 60.8 108.7 139.5 >239.0 >152.6 >88.2 94.7 115.3 89.2 63.1 29.4 >1224.9 1883 55.7 64.4 >39.7 158.2 181.0 157.5 133.7 >100.0 >90.1 >54.0 58.6 26.1 >1119.0 1884 22.2 50.6 63.8 140.7 130.9 105.0 143.0 111.8 115.4 68.3 48.1 17.0 1016.8 1885 47.1 69.2 87.6 116.1 >92.7 >62.5 152.2 115.2 80.9 >93.1 50.0 29.5 >996.1 1886 33.6 47.3 52.3 150.3 113.6 141.6 136.5 104.8 119.0 61.5 71.1 42.3 1073.9 1887 32.2 90.8 105.7 166.2 172.3 263.7 148.7 146.7 94.7 59.2 50.4 33.0 1363.6 1888 39.4 64.3 63.4 96.4 213.2 188.1 108.4 122.0 101.4 78.0 35.5 40.9 1151.0 1889 25.5 66.1 83.6 90.5 127.7 224.9 167.2 78.0 94.7 78.1 46.4 38.3 1121.0 1890 65.1 48.3 125.3 170.0 224.4 123.1 149.9 123.8 97.6 72.1 65.5 34.4 1299.5 1891 66.6 72.7 130.5 124.8 158.4 183.4 152.7 89.2 139.4 146.8 49.0 48.5 1362.0 1892 42.8 56.6 117.2 208.6 154.2 196.4 130.7 103.0 117.6 94.4 60.4 25.2 1307.1 1893 36.4 70.8 122.5 182.4 126.5 190.7 183.9 169.3 133.0 105.8 65.1 53.2 1439.6 1894 47.6 61.8 175.0 121.8 172.0 139.8 153.0 96.2 133.1 76.7 71.7 27.6 1276.3 1895 71.7 77.9 80.9 114.7 222.4 250.1 101.5 76.2 146.0 126.2 75.3 25.7 1368.6 1896 38.6 51.1 86.7 129.5 245.7 157.3 100.8 135.4 87.0 103.9 69.6 47.7 1253.3 1897 58.4 35.7 95.0 143.1 232.4 109.5 192.2 149.1 144.3 89.1 48.7 63.7 1361.2 1898 29.8 83.2 116.9 152.2 179.3 131.1 170.7 145.6 136.6 75.6 53.0 40.4 1314.4 1899 54.9 81.3 136.1 117.4 197.1 204.0 100.5 235.4 117.3 128.8 44.5 30.0 1447.3 1900 64.7 85.5 72.3 127.6 158.9 170.7 152.4 134.2 142.5 92.9 58.9 29.5 1290.1 1901 46.6 37.6 89.3 172.1 254.1 148.0 126.2 151.7 80.0 110.6 53.0 44.8 1314.0 1902 39.9 51.8 81.1 221.6 166.7 123.3 129.7 156.1 117.2 73.4 52.6 33.6 1246.9 1903 51.7 31.8 111.5 118.6 137.5 145.8 148.5 169.1 157.3 85.8 55.9 32.9 1246.4 1904 29.1 27.3 97.4 141.0 174.2 194.9 165.6 140.8 152.5 93.2 43.1 48.1 1307.2 1905 27.5 89.4 154.0 131.1 238.3 239.5 165.1 124.6 124.7 98.0 55.4 45.0 1492.6 1906 43.4 96.5 92.6 190.1 105.7 173.5 185.6 151.4 171.1 92.0 42.3 37.7 1381.9 1907 41.3 74.4 141.5 123.0 152.8 111.8 166.5 140.4 101.9 58.9 77.4 43.0 1232.9 1908 55.3 54.5 107.6 147.8 178.4 185.0 154.7 144.4 70.4 93.8 72.4 36.3 1300.6 1909 37.3 62.2 85.4 175.3 209.4 137.7 117.9 142.9 113.2 91.6 94.5 40.1 1307.5 1910 48.2 79.8 87.3 137.7 181.4 148.4 204.3 126.6 103.4 85.0 87.5 33.9 1323.5 1911 50.5 63.0 108.4 127.3 216.8 205.4 201.5 189.6 157.3 77.3 70.8 41.5 1509.4 1912 33.0 61.4 97.1 160.7 146.2 118.6 139.3 72.1 103.0 103.1 30.9 20.2 1085.6 1913 35.3 47.9 111.2 135.0 150.3 143.5 145.6 156.2 91.6 79.3 66.4 33.6 1195.9 1914 18.0 51.7 108.8 195.0 141.6 158.0 134.5 182.4 139.6 75.9 59.6 36.9 1302.0 1915 47.0 74.7 101.7 148.1 198.9 203.8 109.0 100.0 139.4 76.1 75.7 38.5 1312.9 1916 49.8 86.5 86.2 142.7 150.0 159.2 107.0 146.2 83.2 52.5 43.8 60.0 1167.1 1917 39.6 62.1 106.6 109.8 136.3 187.5 178.2 141.5 96.8 97.8 35.6 37.3 1229.1 1918 31.8 40.5 127.0 202.8 151.2 186.6 162.9 124.2 121.1 65.3 93.5 50.3 1357.2 1919 61.2 79.3 111.8 157.9 194.9 158.6 167.6 176.4 134.9 103.5 74.7 41.9 1462.7 1920 54.5 70.0 107.7 104.5 159.2 172.2 104.9 115.0 111.8 94.8 31.0 43.9 1169.5 1921 33.9 55.8 88.0 209.0 158.1 217.0 156.7 102.9 136.8 70.1 51.4 33.4 1313.1 1922 69.3 73.5 135.4 162.7 165.9 161.2 131.5 94.9 96.8 103.8 48.1 39.3 1282.4 1923 41.5 71.0 137.8 136.3 162.0 94.0 143.3 145.6 122.9 119.6 76.7 47.0 1297.7 1924 37.3 56.9 119.5 155.5 167.9 121.7 101.7 99.0 126.4 93.7 49.9 42.5 1172.0 1925 48.6 63.2 91.6 166.7 112.4 236.7 117.8 149.6 105.6 76.2 89.9 40.9 1299.2 1926 41.4 34.3 64.0 163.6 155.8 158.7 162.6 164.5 116.1 116.1 54.9 32.0 1264.0 1927 51.7 73.6 98.8 138.0 190.6 158.9 141.2 150.6 116.2 90.8 85.6 40.0 1334.0 1928 78.7 66.1 99.1 152.3 198.0 164.1 134.5 148.7 136.9 65.0 64.7 30.1 1346.2 1929 33.4 36.5 170.4 144.4 192.9 183.8 130.0 84.8 134.7 115.9 49.8 56.0 1332.6 1930 44.0 71.9 84.0 153.1 154.8 236.6 95.2 106.6 118.7 71.7 65.3 30.2 1232.1 1931 58.5 53.3 116.8 116.0 156.4 120.3 81.1 158.9 103.2 108.3 62.3 19.1 1154.2 1932 37.5 73.7 115.8 155.5 152.8 198.1 113.1 104.7 105.6 107.2 72.8 46.6 1283.4 1933 73.0 57.0 124.3 121.3 122.4 167.3 158.4 148.8 152.2 65.5 67.3 31.9 1289.4 1934 49.6 64.8 114.2 113.3 164.0 192.5 207.8 114.0 129.6 70.2 41.2 28.7 1289.9 1935 32.3 76.6 92.7 162.1 251.6 151.2 193.2 135.2 110.1 81.0 81.3 49.2 1416.5 1936 33.7 74.4 72.9 169.6 174.4 189.0 99.0 152.7 106.9 92.1 49.1 39.2 1253.0 1937 45.1 69.1 107.1 49.1 197.7 111.8 93.2 139.0 106.6 71.7 49.5 35.2 1075.1 1938 25.9 58.8 87.6 196.9 140.6 129.3 96.4 144.2 91.1 88.3 54.9 43.1 1157.1 1939 58.3 41.0 99.2 148.5 170.1 233.0 95.8 146.5 86.1 116.1 51.5 30.0 1277.7 1940 55.8 38.8 94.3 108.1 168.3 256.0 121.7 115.6 108.0 59.1 71.5 26.3 1223.5 1941 42.8 89.9 112.6 113.5 166.9 139.3 105.6 141.1 107.4 97.3 61.5 29.1 1207.0 1942 59.8 65.6 79.2 203.5 212.0 174.0 141.0 83.8 114.6 80.5 68.5 28.4 1310.9 1943 62.8 78.8 114.7 119.7 217.3 188.0 196.4 109.8 97.2 92.9 54.4 22.9 1354.9 1944 30.9 83.8 114.3 123.6 148.4 98.5 95.5 151.0 111.7 84.8 46.3 28.6 1117.4 1945 42.2 58.8 88.2 166.8 145.0 134.4 118.4 143.6 96.4 78.9 42.0 29.9 1146.9 1946 58.1 78.7 113.5 127.9 244.2 153.4 115.0 108.9 74.5 41.9 54.4 35.3 1216.8 1947 40.9 46.2 78.1 121.6 181.9 143.9 109.3 245.5 101.5 92.4 79.7 21.2 1262.2 1948 45.1 54.0 122.1 171.9 222.3 126.4 149.5 107.7 97.6 87.5 75.8 47.9 1306.8 1949 43.8 83.6 122.1 139.7 208.5 252.9 121.9 113.4 151.8 73.9 70.1 30.4 1412.1 1950 41.4 64.0 125.6 130.4 209.0 180.1 146.2 136.9 106.5 86.2 74.8 34.8 1335.9 1951 55.3 78.8 90.3 161.8 196.7 207.3 112.0 132.8 93.7 92.0 45.4 35.3 1301.4 1952 50.8 57.3 113.5 145.3 171.5 145.1 105.8 108.4 105.6 121.3 52.7 23.2 1208.0 1953 41.8 51.1 111.5 154.7 204.9 158.5 141.9 130.1 92.3 83.7 53.1 31.8 1255.4 1954 39.1 41.4 100.6 170.7 161.7 114.2 85.6 116.6 135.2 60.5 51.9 23.9 1101.4 1955 53.3 70.6 140.4 173.8 203.7 103.3 217.8 132.9 144.6 101.7 40.4 30.1 1412.6 1956 46.2 73.1 114.6 152.1 170.1 179.7 133.8 129.3 74.1 96.6 40.6 23.7 1233.9 1957 54.9 85.0 62.7 173.5 187.9 247.2 65.0 111.4 88.9 62.8 55.7 48.9 1243.9 1958 57.2 59.8 100.9 133.3 193.6 121.5 144.4 108.4 102.3 86.6 48.1 35.8 1191.9 1959 82.7 56.9 119.3 157.2 229.1 223.4 143.1 141.7 140.5 104.1 73.3 41.0 1512.3 1960 42.8 105.4 66.0 159.7 196.2 225.3 143.9 144.8 119.7 62.2 60.4 65.0 1391.4 1961 54.4 67.3 83.0 108.2 178.4 139.6 89.8 137.1 115.1 104.3 58.3 34.2 1178.8 1962 52.2 63.9 126.5 194.9 211.6 174.5 103.5 154.9 70.9 91.4 39.7 36.1 1320.2 1963 59.7 71.8 119.5 136.0 182.0 164.0 168.0 112.0 129.5 75.2 48.9 51.3 1318.3 1964 27.3 64.2 69.7 121.2 169.8 126.3 110.6 146.5 128.3 67.5 67.3 41.8 1140.5 1965 62.2 44.9 117.1 153.6 137.3 135.4 125.3 124.6 70.8 75.5 70.8 52.3 1169.8 1966 29.5 41.2 124.8 88.9 219.5 140.3 164.1 128.2 105.7 103.6 63.0 40.5 1249.3 1967 50.3 83.9 115.1 140.3 140.5 165.9 97.6 127.2 120.9 88.0 75.0 41.1 1245.8 1968 33.6 92.6 100.7 151.7 156.8 215.5 127.7 177.9 108.3 59.0 46.9 32.7 1303.4 1969 29.4 65.9 82.8 184.8 128.8 189.9 165.9 135.3 77.2 64.8 61.5 31.7 1218.0 1970 24.7 81.3 105.8 126.7 109.2 184.0 90.0 132.9 79.6 59.1 62.7 50.3 1106.3 1971 54.2 55.2 76.2 119.8 162.6 131.1 166.4 100.1 141.1 86.3 49.5 26.4 1168.9 1972 38.2 69.2 112.0 129.7 130.0 139.8 147.1 96.0 121.9 84.8 58.0 45.1 1171.8 1973 24.5 64.6 94.3 123.8 133.4 157.9 108.6 124.1 106.4 79.1 44.5 41.5 1102.7 1974 27.4 59.6 92.7 198.1 130.4 156.9 112.8 155.7 105.0 81.6 78.2 30.5 1228.9 1975 50.5 74.0 118.8 139.1 239.3 213.1 126.8 148.1 111.4 79.3 56.3 25.9 1382.6 1976 32.7 44.0 67.9 149.1 110.4 174.4 122.3 227.8 86.7 74.7 71.5 24.3 1185.8 1977 50.3 40.0 77.0 137.8 226.2 170.3 174.8 173.1 93.2 79.0 55.4 20.0 1297.1 1978 64.7 61.7 100.6 108.1 163.8 123.5 121.9 73.0 87.4 88.4 54.4 42.8 1090.3 1979 55.7 58.5 103.5 121.7 150.4 134.4 107.2 123.0 101.2 88.8 62.4 45.0 1151.8 1980 41.7 53.8 94.4 128.1 220.1 88.7 96.9 96.2 92.5 81.0 52.2 23.9 1069.5 1981 37.1 59.6 76.3 152.5 126.8 109.9 95.9 110.0 110.3 92.5 48.2 17.8 1036.9 1982 42.3 61.2 134.5 141.5 170.1 132.6 155.9 122.9 108.8 77.0 41.3 41.5 1229.6 1983 40.5 67.5 54.5 147.6 117.1 114.0 177.1 117.1 67.1 79.7 27.5 29.8 1039.5 1984 38.7 42.1 71.3 158.4 214.1 132.3 173.0 141.5 96.5 87.7 48.4 28.4 1232.4 1985 52.5 69.6 85.1 126.5 145.4 152.7 89.6 98.3 79.7 71.2 62.7 46.9 1080.2 1986 41.6 68.1 113.8 138.0 159.6 137.4 76.2 110.3 142.8 105.4 74.9 40.6 1208.7 1987 41.1 62.6 71.7 91.1 170.6 76.9 109.5 105.2 145.8 109.1 52.9 23.7 1060.2 1988 55.5 71.1 80.6 134.0 172.6 166.4 114.6 116.6 108.3 95.4 66.8 38.1 1220.0 1989 55.5 87.7 112.4 109.1 227.5 183.1 243.8 118.1 98.5 60.7 45.2 24.3 1365.9 1990 58.1 61.0 88.9 149.4 165.0 135.5 214.9 104.3 120.0 77.2 73.0 46.1 1293.4 1991 69.4 48.4 87.2 147.0 143.6 114.0 132.5 153.0 163.2 70.8 63.8 31.2 1224.1 1992 26.8 55.5 71.9 79.5 179.2 158.6 112.1 143.3 85.9 85.5 57.8 40.2 1096.3 1993 40.4 24.8 71.9 112.1 121.2 88.3 92.6 140.4 96.4 85.4 56.8 34.0 964.3 1994 53.1 48.6 105.4 174.4 142.2 102.9 127.5 113.4 110.5 112.9 56.0 49.9 1196.8 1995 31.8 58.9 101.6 149.1 164.3 227.0 150.9 242.7 124.4 106.7 60.5 31.5 1449.4 1996 24.1 109.4 102.6 116.4 170.8 184.9 138.4 100.7 142.8 72.1 72.0 41.9 1276.1 1997 20.5 75.9 88.6 81.9 201.9 136.6 122.5 185.0 138.8 87.0 47.3 36.3 1222.6 1998 55.0 61.0 60.1 133.5 137.7 137.1 127.2 156.3 106.9 105.7 66.6 34.5 1181.6 1999 45.3 62.3 128.3 160.8 120.6 126.9 187.3 117.9 106.9 92.6 52.4 39.1 1240.4 2000 41.9 78.9 82.9 138.5 233.1 140.7 119.1 167.7 114.6 96.8 42.1 32.2 1288.5 2001 63.6 87.2 117.2 124.8 196.7 125.8 121.2 152.2 117.8 86.7 36.5 77.0 1306.7 2002 52.1 86.9 122.7 176.9 152.4 128.4 102.0 121.2 119.9 79.4 62.0 36.9 1240.8 2003 61.1 88.1 146.1 169.4 144.4 170.5 108.9 183.6 124.3 96.8 89.0 51.7 1433.9