| Sea surface temperature Noordhinder. Various gaps have been corrected. | |||||||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year | |
| 1884 | 7.7 | 8.3 | 8.2 | 9.0 | 10.7 | 13.5 | 16.3 | 18.3 | 17.2 | 14.9 | 11.7 | 9.1 | 12.08 |
| 1885 | 6.3 | 7.3 | 7.2 | 7.8 | 10.2 | 13.1 | 16.1 | 17.1 | 16.1 | 13.5 | 10.7 | 8.6 | 11.17 |
| 1886 | 6.6 | 5.1 | 4.3 | 7.0 | 9.6 | 12.6 | 15.2 | 16.3 | 17.1 | 15.1 | 12.4 | 9.0 | 10.86 |
| 1887 | 6.5 | 5.3 | 4.7 | 5.6 | 8.3 | 12.1 | 15.6 | 17.2 | 15.8 | 13.1 | 10.2 | 8.2 | 10.22 |
| 1888 | 5.9 | 4.0 | 3.0 | 4.9 | 8.4 | 11.8 | 13.8 | 15.1 | 15.5 | 13.2 | 11.2 | 9.8 | 9.72 |
| 1889 | 7.4 | 5.3 | 4.4 | 6.2 | 9.9 | 13.8 | 15.8 | 16.1 | 15.9 | 13.5 | 11.5 | 8.1 | 10.66 |
| 1890 | 7.5 | 6.5 | 5.6 | 6.8 | 10.1 | 13.3 | 14.8 | 16.5 | 16.7 | 15.5 | 12.4 | 7.6 | 11.11 |
| 1891 | 4.3 | 4.1 | 4.7 | 6.5 | 9.7 | 12.7 | 14.8 | 15.4 | 15.7 | 14.4 | 11.3 | 9.5 | 10.26 |
| 1892 | 7.1 | 5.7 | 4.7 | 5.7 | 8.7 | 12.4 | 14.8 | 16.0 | 15.9 | 13.3 | 11.8 | 8.6 | 10.39 |
| 1893 | 5.8 | 5.2 | 7.1 | 8.4 | 11.3 | 13.6 | 16.6 | 17.8 | 17.7 | 15.5 | 11.7 | 9.0 | 11.64 |
| 1894 | 6.6 | 7.4 | 7.7 | 9.6 | 11.6 | 13.3 | 16.2 | 16.8 | 16.3 | 14.5 | 13.0 | 9.9 | 11.91 |
| 1895 | 6.7 | 3.1 | 3.4 | 5.8 | 9.1 | 12.6 | 15.8 | 16.9 | 17.7 | 15.4 | 12.6 | 9.1 | 10.68 |
| 1896 | 7.7 | 6.9 | 7.9 | 9.1 | 11.2 | 14.5 | 17.2 | 18.2 | 17.4 | 14.4 | 11.0 | 7.7 | 11.93 |
| 1897 | 6.1 | 5.1 | 7.2 | 8.5 | 10.4 | 13.4 | 16.1 | 17.6 | 16.1 | 14.2 | 11.7 | 9.1 | 11.29 |
| 1898 | 8.7 | 7.3 | 6.1 | 7.3 | 10.1 | 12.7 | 15.1 | 17.0 | 17.9 | 15.7 | 13.4 | 10.9 | 11.85 |
| 1899 | 8.8 | 7.8 | 7.2 | 8.1 | 10.4 | 13.3 | 16.3 | 18.6 | 17.7 | 14.5 | 12.8 | 9.4 | 12.08 |
| 1900 | 8.4 | 6.7 | 6.5 | 7.4 | 10.1 | 12.8 | 15.9 | 17.0 | 17.1 | 15.2 | 12.5 | 10.7 | 11.69 |
| 1901 | 8.1 | 5.9 | 5.4 | 6.9 | 9.7 | 13.0 | 16.3 | 17.7 | 16.8 | 14.9 | 11.7 | 8.7 | 11.26 |
| 1902 | 8.1 | 5.0 | 5.7 | 7.5 | 9.2 | 12.0 | 15.3 | 16.2 | 16.3 | 13.9 | 11.4 | 8.0 | 10.72 |
| 1903 | 7.3 | 7.4 | 7.9 | 8.8 | 9.9 | 12.6 | 15.2 | 16.2 | 15.9 | 14.6 | 12.0 | 8.5 | 11.36 |
| 1904 | 6.4 | 6.8 | 6.0 | 7.7 | 10.3 | 13.0 | 16.4 | 17.9 | 16.6 | 14.2 | 11.8 | 9.5 | 11.38 |
| 1905 | 7.2 | 5.8 | 7.1 | 8.6 | 10.5 | 13.5 | 16.6 | 17.3 | 16.2 | 12.9 | 10.5 | 8.6 | 11.23 |
| 1906 | 7.8 | 6.3 | 6.0 | 6.6 | 9.2 | 12.0 | 15.1 | 16.7 | 16.8 | 15.3 | 12.7 | 9.0 | 11.13 |
| 1907 | 6.0 | 4.2 | 4.5 | 6.9 | 9.9 | 12.1 | 13.9 | 15.4 | 15.9 | 14.9 | 12.6 | 10.1 | 10.53 |
| 1908 | 6.0 | 5.3 | 5.7 | 7.1 | 9.5 | 12.8 | 15.4 | 16.6 | 15.5 | 15.0 | 11.5 | 9.0 | 10.78 |
| 1909 | 7.0 | 4.8 | 4.2 | 6.9 | 9.7 | 12.6 | 14.4 | 16.1 | 16.0 | 15.1 | 11.5 | 8.0 | 10.53 |
| 1910 | 7.2 | 6.7 | 7.3 | 7.8 | 10.1 | 13.2 | 14.6 | 16.1 | 15.9 | 14.7 | 11.3 | 9.5 | 11.20 |
| 1911 | 7.3 | 6.0 | 6.3 | 6.2 | 9.5 | 13.2 | 15.7 | 18.6 | 18.7 | 15.3 | 12.3 | 10.0 | 11.59 |
| 1912 | 8.7 | 7.3 | 8.5 | 9.2 | 11.3 | 13.9 | 16.5 | 16.2 | 14.7 | 13.0 | 11.0 | 9.4 | 11.64 |
| 1913 | 8.6 | 8.0 | 7.5 | 8.4 | 10.9 | 13.3 | 15.0 | 16.3 | 16.9 | 15.4 | 13.3 | 10.4 | 12.00 |
| 1914 | 6.2 | 5.9 | 7.6 | 9.2 | 11.3 | 13.5 | 16.4 | 17.4 | 17.3 | 14.7 | 12.0 | 10.0 | 11.79 |
| 1915 | 8.2 | 7.1 | 6.8 | 7.3 | 9.1 | 12.0 | 14.9 | 16.4 | 16.4 | 14.5 | 11.0 | 8.7 | 11.03 |
| 1916 | 8.8 | 7.5 | 6.4 | 7.5 | 10.2 | 12.2 | 14.0 | 15.9 | 16.1 | 14.8 | 12.1 | 9.2 | 11.23 |
| 1917 | 7.1 | 4.7 | 3.9 | 4.8 | 7.6 | 11.3 | 14.1 | 16.2 | 15.8 | 13.9 | 11.2 | 8.3 | 9.91 |
| 1918 | 5.8 | 6.3 | 6.3 | 7.4 | 10.4 | 12.9 | 14.9 | 16.4 | 15.6 | 13.5 | 11.4 | 10.0 | 10.91 |
| 1919 | 8.3 | 5.7 | 6.2 | 6.8 | 10.0 | 12.8 | 13.7 | 15.7 | 16.3 | 13.3 | 9.1 | 7.7 | 10.47 |
| 1920 | 7.5 | 7.6 | 7.7 | 9.6 | 11.3 | 13.9 | 15.8 | 16.1 | 15.9 | 15.0 | 11.7 | 8.5 | 11.72 |
| 1921 | 8.9 | 7.7 | 7.6 | 8.7 | 10.9 | 13.6 | 16.5 | 17.7 | 17.4 | 16.7 | 12.1 | 8.6 | 12.20 |
| 1922 | 6.8 | 7.5 | 8.3 | 7.4 | 9.9 | 13.6 | 14.6 | 15.7 | 15.6 | 13.6 | 10.2 | 8.4 | 10.97 |
| 1923 | 7.6 | 7.4 | 8.1 | 8.7 | 10.2 | 11.1 | 14.8 | 16.5 | 15.4 | 14.0 | 11.0 | 7.9 | 11.06 |
| 1924 | 6.1 | 5.8 | 4.7 | 5.3 | 9.5 | 12.5 | 15.1 | 15.9 | 15.4 | 14.1 | 11.7 | 9.6 | 10.48 |
| 1925 | 8.6 | 7.8 | 7.0 | 7.3 | 9.9 | 13.1 | 15.6 | 16.4 | 15.4 | 14.0 | 11.4 | 7.5 | 11.17 |
| 1926 | 7.1 | 7.7 | 7.8 | 8.3 | 10.1 | 12.5 | 15.4 | 16.7 | 17.1 | 14.7 | 11.5 | 8.9 | 11.48 |
| 1927 | 6.9 | 6.5 | 7.7 | 8.7 | 10.4 | 12.6 | 14.8 | 16.3 | 15.9 | 14.1 | 11.8 | 8.2 | 11.16 |
| 1928 | 5.9 | 7.3 | 7.2 | 8.5 | 9.9 | 12.7 | 15.6 | 17.0 | 16.3 | 13.6 | 12.2 | 9.8 | 11.33 |
| 1929 | 6.5 | 4.4 | 3.3 | 4.6 | 7.7 | 11.8 | 14.9 | 16.4 | 17.3 | 15.2 | 11.9 | 10.5 | 10.38 |
| 1930 | 9.0 | 7.1 | 6.2 | 7.7 | 10.2 | 13.7 | 15.9 | 16.4 | 16.7 | 14.8 | 11.9 | 9.9 | 11.63 |
| 1931 | 8.4 | 7.0 | 6.1 | 6.8 | 8.8 | 11.9 | 13.8 | 14.5 | 14.1 | 12.6 | 10.2 | 8.3 | 10.21 |
| 1932 | 7.0 | 6.3 | 5.6 | 7.0 | 9.4 | 12.1 | 15.6 | 17.3 | 17.4 | 14.6 | 11.7 | 8.7 | 11.06 |
| 1933 | 7.2 | 5.9 | 6.8 | 8.4 | 10.7 | 13.6 | 15.8 | 18.0 | 18.0 | 16.1 | 12.2 | 7.6 | 11.69 |
| 1934 | 6.2 | 5.3 | 5.4 | 7.3 | 10.0 | 13.0 | 16.4 | 17.5 | 17.3 | 15.0 | 12.2 | 11.0 | 11.38 |
| 1935 | 9.3 | 7.3 | 7.0 | 8.0 | 10.0 | 12.9 | 16.1 | 18.1 | 17.1 | 14.5 | 12.3 | 9.0 | 11.80 |
| 1936 | 8.2 | 6.9 | 7.2 | 8.2 | 10.1 | 12.6 | 15.5 | 16.5 | 17.0 | 14.5 | 11.7 | 9.1 | 11.46 |
| 1937 | 8.2 | 8.1 | 7.4 | 8.6 | 10.5 | 13.7 | 16.1 | 17.4 | 17.1 | 15.5 | 12.6 | 9.5 | 12.06 |
| 1938 | 7.8 | 6.9 | 6.8 | 8.0 | 9.5 | 12.5 | 15.0 | 16.9 | 17.0 | 14.9 | 13.1 | 10.0 | 11.53 |
| 1939 | 7.9 | 7.1 | 7.3 | 8.0 | 10.1 | 13.2 | 15.3 | 17.3 | 18.5 | 15.0 | 12.6 | 10.0 | 11.86 |
| 1940 | 6.3 | 4.3 | 4.3 | 6.6 | 10.1 | 13.7 | 15.9 | 16.4 | 15.9 | 14.0 | 12.1 | 8.6 | 10.68 |
| 1941 | |||||||||||||
| 1942 | |||||||||||||
| 1943 | |||||||||||||
| 1944 | |||||||||||||
| 1945 | |||||||||||||
| 1946 | |||||||||||||
| 1947 | |||||||||||||
| 1948 | 9.1 | 7.8 | 6.9 | 8.9 | 11.5 | 13.8 | 14.9 | 16.8 | 16.6 | 14.9 | 12.2 | 9.8 | 11.93 |
| 1949 | 8.1 | 7.3 | 6.5 | 8.3 | 10.3 | 12.9 | 15.8 | 17.4 | 18.7 | 17.1 | 12.6 | 10.0 | 12.08 |
| 1950 | 8.1 | 7.0 | 7.6 | 8.4 | 10.3 | 14.2 | 16.6 | 18.0 | 16.8 | 14.3 | 11.5 | 8.4 | 11.77 |
| 1951 | 6.9 | 6.8 | 6.5 | 7.4 | 9.7 | 12.9 | 15.7 | 17.0 | 17.1 | 14.7 | 12.7 | 10.4 | 11.48 |
| 1952 | 8.6 | 6.5 | 6.6 | 7.9 | 11.2 | 13.7 | 16.4 | 17.4 | 16.2 | 13.1 | 10.4 | 7.5 | 11.29 |
| 1953 | 6.4 | 5.9 | 5.2 | 6.8 | 9.8 | 12.7 | 15.0 | 16.7 | 16.6 | 15.4 | 13.1 | 11.2 | 11.23 |
| 1954 | 7.9 | 4.3 | 6.2 | 7.4 | 9.5 | 12.4 | 14.8 | 15.7 | 15.9 | 14.5 | 12.6 | 10.7 | 10.99 |
| 1955 | 7.1 | 6.1 | 4.4 | 5.5 | 8.4 | 11.6 | 14.8 | 17.2 | 17.7 | 15.2 | 12.2 | 9.6 | 10.82 |
| 1956 | 8.0 | 5.2 | 4.2 | 5.9 | 8.9 | 12.1 | 14.6 | 15.7 | 15.7 | 14.6 | 11.3 | 9.2 | 10.45 |
| 1957 | 8.0 | 7.8 | 8.3 | 9.5 | 10.8 | 13.6 | 16.4 | 17.1 | 16.0 | 14.4 | 12.4 | 9.2 | 11.96 |
| 1958 | 7.1 | 6.7 | 6.1 | 6.4 | 9.1 | 12.5 | 14.8 | 16.1 | 16.9 | 15.1 | 12.5 | 10.0 | 11.11 |
| 1959 | 8.0 | 6.0 | 6.4 | 8.6 | 11.1 | 13.7 | 16.7 | 18.5 | 18.5 | 16.7 | 13.0 | 11.0 | 12.35 |
| 1960 | 8.6 | 7.0 | 7.4 | 8.5 | 10.4 | 13.5 | 15.6 | 17.0 | 16.8 | 14.7 | 12.6 | 10.4 | 11.88 |
| 1961 | 7.9 | 7.7 | 8.1 | 9.4 | 11.9 | 13.9 | 16.3 | 16.9 | 17.3 | 16.2 | 12.2 | 9.3 | 12.26 |
| 1962 | 7.4 | 6.8 | 4.7 | 6.0 | 8.5 | 11.7 | 14.5 | 15.8 | 15.6 | 14.8 | 11.7 | 8.2 | 10.48 |
| 1963 | 3.6 | 1.3 | 2.6 | 5.9 | 8.7 | 11.8 | 14.2 | 16.0 | 15.5 | 14.2 | 12.8 | 9.3 | 9.66 |
| 1964 | 6.4 | 5.4 | 4.5 | 6.2 | 10.1 | 13.4 | 15.7 | 17.2 | 17.0 | 14.7 | 11.7 | 9.3 | 10.97 |
| 1965 | 7.2 | 5.2 | 4.6 | 6.6 | 9.7 | 12.4 | 14.7 | 16.1 | 15.7 | 14.8 | 11.5 | 9.0 | 10.63 |
| 1966 | 7.0 | 6.9 | 7.9 | 8.2 | 10.8 | 13.6 | 15.5 | 16.6 | 16.8 | 15.7 | 11.9 | 8.9 | 11.65 |
| 1967 | 6.9 | 7.3 | 8.0 | 8.4 | 10.5 | 13.1 | 16.1 | 17.4 | 16.7 | 15.0 | 11.8 | 8.9 | 11.68 |
| 1968 | 6.4 | 5.6 | 5.0 | 6.9 | 9.6 | 12.4 | 14.8 | 16.1 | 16.5 | 15.3 | 12.3 | 9.4 | 10.86 |
| 1969 | 7.8 | 6.4 | 5.5 | 6.7 | 9.9 | 12.8 | 15.4 | 17.6 | 17.2 | 16.2 | 13.0 | 8.8 | 11.44 |
| 1970 | 7.0 | 7.1 | 5.8 | 6.6 | 9.6 | 13.3 | 15.2 | 16.7 | 16.3 | 14.7 | 12.3 | 10.0 | 11.22 |
| 1971 | 7.1 | 7.4 | 6.4 | 7.3 | 9.7 | 12.6 | 15.7 | 16.9 | 17.0 | 15.6 | 12.3 | 9.6 | 11.47 |
| 1972 | 7.9 | 7.3 | 7.0 | 8.3 | 10.2 | 12.4 | 14.8 | 16.1 | 16.1 | 14.2 | 11.7 | 9.9 | 11.33 |
| 1973 | 8.2 | 7.4 | 7.1 | 7.6 | 9.6 | 13.0 | 16.1 | 17.2 | 17.5 | 15.0 | 11.6 | 8.2 | 11.54 |
| 1974 | 8.2 | 8.6 | 7.8 | 8.9 | 10.5 | 13.2 | 15.4 | 16.8 | 16.1 | 13.2 | 10.6 | 9.2 | 11.54 |
| 1975 | 8.8 | 7.9 | 7.2 | 7.0 | 9.3 | 12.1 | 15.3 | 17.9 | 17.7 | 14.9 | 12.2 | 9.3 | 11.63 |
| 1976 | 7.8 | 5.4 | 5.6 | 7.3 | 9.5 | 13.1 | 17.1 | 18.5 | 17.8 | 15.9 | 12.9 | 9.3 | 11.68 |
| 1977 | 7.4 | 7.7 | 8.2 | 8.3 | 10.2 | 12.5 | 15.0 | 16.5 | 16.5 | 15.0 | 12.7 | 9.4 | 11.62 |
| 1978 | 7.2 | 6.2 | 6.6 | 7.5 | 9.4 | 12.5 | 14.4 | 16.2 | 16.3 | 15.1 | 13.4 | 10.4 | 11.27 |
| 1979 | 7.0 | 4.9 | 5.3 | 7.3 | 9.5 | 12.5 | 15.0 | 16.4 | 16.2 | 15.2 | 12.5 | 10.8 | 11.05 |
| 1980 | 7.6 | 7.6 | 7.4 | 8.2 | 9.8 | 13.0 | 14.8 | 16.6 | 16.9 | 15.1 | 11.0 | 8.3 | 11.36 |
| 1981 | 6.8 | 6.1 | 7.1 | 8.6 | 10.0 | 12.8 | 14.5 | 16.5 | 17.2 | 14.5 | 11.7 | 8.6 | 11.20 |
| 1982 | 6.2 | 5.9 | 7.1 | ||||||||||
| Average | 7.34 | 6.37 | 6.31 | 7.51 | 9.95 | 12.87 | 15.41 | 16.78 | 16.60 | 14.68 | 11.90 | 9.21 | 11.24 |
| St.Dev. | 1.02 | 1.26 | 1.37 | 1.14 | 0.82 | 0.67 | 0.78 | 0.82 | 0.86 | 0.86 | 0.79 | 0.88 | 0.58 |