Monthly mean by the BSO
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year 1976 6.0 0.0 17.0 27.0 14.0 15.0 3.0 17.0 14.0 19.0 6.0 25.0 1977 20.0 25.0 9.0 15.0 21.0 51.0 26.0 43.0 56.0 62.0 39.0 57.0 1978 55.0 86.0 69.0 92.0 88.0 79.0 63.0 70.0 120.0 130.0 90.0 95.0 1979 130.0 130.0 130.0 99.0 127.0 140.0 150.0 129.0 172.0 188.0 164.0 137.0 1980 138.0 124.0 117.0 154.0 188.0 139.0 136.0 154.0 175.0 158.0 142.0 163.0 1982 99.0 174.0 155.0 132.0 91.0 125.0 106.0 108.0 118.0 90.0 89.0 113.0 1983 89.0 55.0 64.0 79.0 97.0 95.0 86.0 71.0 53.0 52.0 34.0 29.0 1984 54.0 72.0 87.0 65.0 71.0 50.0 39.0 28.0 13.0 10.0 19.0 17.0 1985 12.0 15.0 12.0 14.0 25.0 21.0 31.0 8.0 6.0 16.0 15.0 6.0 1986 2.0 19.0 8.0 16.0 13.0 0.0 15.0 8.0 5.0 35.0 12.0 5.0 1987 10.0 4.0 14.0 43.0 32.0 16.0 33.0 42.0 34.0 52.0 37.0 22.0 1988 58.0 37.0 68.0 82.0 91.0 50.0 88.0 106.0 106.0 126.0 140.0 169.0 1989 162.0 163.0 131.0 131.0 147.0 210.0 134.0 180.0 183.0 165.0 171.0 163.0 1990 167.0 134.0 137.0 145.0 125.0 117.0 143.0 192.0 124.0 158.0 154.0 138.0 1991 148.0 165.0 147.0 145.0 128.0 175.0 185.0 187.0 126.0 148.0 110.0 163.0 1992 146.0 163.0 114.0 98.0 68.0 73.0 72.0 65.0 68.0 95.0 96.0 86.0 1993 61.0 90.0 66.0 64.0 53.0 53.0 61.0 42.0 27.0 62.0 44.0 42.0 1994 58.0 40.0 31.0 19.0 21.0 29.0 34.0 26.0 27.0 48.0 19.0 25.0 1995 22.0 35.0 33.0 13.0 14.0 16.0 15.0 14.0 13.0 24.0 12.0 14.0 1996 9.8 4.3 9.9 3.4 5.3 11.8 8.7 14.6 1.7 0.1 19.2 10.0 1997 5.5 8.6 9.5 16.8 18.8 12.3 7.5 25.2 46.6 23.8 41.6 46.3 1998 35.5 37.7 65.8 55.2 60.5 72.5 78.0 100.2 106.5 67.8 77.2 93.2 1999 69.1 83.4 80.1 82.2 124.2 163.7 138.7 114.8 83.6 149.2 173.4 98.1 2000 113.2 141.5 179.8 159.6 145.1 169.1 222.2 150.7 138.2 117.0 132.5 121.5 2001 122.1 103.4 150.7 142.6 126.7 183.1 107.6 140.0 211.9 170.2 143.4 184.3 2002 147.7 124.5 165.7 165.7 163.9 113.7 146.5 161.8 162.7 130.6 128.4 124.5 2OO3 114.3 65.1 85.7 85.7 74.0 108.6 108.9 105.5 70.4 91.2 78.8 60.2 2004 49.5 68.3 66.8 50.0 63.2 60.2 77.2 64.0 43.0 65.0 60.4 24.3 2005 39.8 37.2 35.8 34.4 53.1 52.4 58.7 55.5 23.4 12.2 24.7 55.0 2006 19.7 4.6 14.3 44.7 31.3 21.7 19.7 19.2 20.3 14.4 32.1 19.4 2007 25.7 16.0 6.4 5.2 17.9 17.2 14.1 9.4 3.8 1.1 2.2 14.3 2008 3.2 2.4 13.2 3.5 4.8 4.8 0.7
