| Air Temperature Noordhinder. See remarks below the table | |||||||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year | |
| 1859 | 6.8 | 8.1 | 9.3 | 9.0 | 11.6 | 16.3 | 19.9 | 18.9 | 16.3 | 13.3 | 8.5 | 4.5 | 11.88 |
| 1860 | 6.1 | 3.6 | 5.2 | 7.0 | 10.9 | 13.1 | 15.2 | 15.4 | 15.0 | 13.0 | 8.2 | 6.0 | 9.89 |
| 1861 | 3.1 | 6.3 | 8.1 | 8.2 | 11.2 | 15.0 | 17.7 | 18.3 | 16.7 | 15.3 | 9.7 | 7.3 | 11.41 |
| 1862 | 4.9 | 5.5 | 7.1 | 9.5 | 13.3 | 13.9 | 16.0 | 17.4 | 16.7 | 13.7 | 8.3 | 7.5 | 11.15 |
| 1863 | 6.7 | 7.4 | 7.8 | 9.8 | 12.3 | 14.9 | 17.2 | 17.5 | 15.0 | 13.6 | 9.8 | 8.3 | 11.69 |
| 1864 | 3.4 | 3.7 | 6.6 | 8.7 | 12.0 | 14.4 | 16.2 | 16.5 | 16.1 | 12.4 | 9.1 | 5.3 | 10.37 |
| 1865 | 5.2 | 3.8 | 4.7 | 8.8 | 13.0 | 14.9 | 17.7 | 17.6 | 18.8 | 14.7 | 11.1 | 8.7 | 11.58 |
| 1866 | 8.8 | 8.3 | 7.5 | 10.6 | 12.0 | 16.2 | 16.4 | 16.3 | 16.0 | 14.3 | 10.8 | 9.1 | 12.19 |
| 1867 | 5.7 | 8.9 | 6.0 | 10.2 | 12.4 | 14.6 | 15.9 | 18.6 | 16.9 | 12.9 | 10.1 | 6.2 | 11.53 |
| 1868 | 5.4 | 7.9 | 9.0 | 10.2 | 15.0 | 16.9 | 19.4 | 19.3 | 18.1 | 13.3 | 9.0 | 10.1 | 12.80 |
| 1869 | 7.8 | 9.6 | 7.0 | 10.6 | 12.2 | 13.8 | 17.5 | 16.8 | 16.8 | 13.0 | 9.8 | 7.1 | 11.83 |
| 1870 | 7.3 | 4.4 | 6.4 | 9.1 | 11.9 | 13.8 | 16.9 | 16.7 | 16.1 | 13.4 | 9.9 | 4.9 | 10.90 |
| 1871 | 3.4 | 6.2 | 8.2 | 9.4 | 11.5 | 13.4 | 16.4 | 18.5 | 16.7 | 12.8 | 7.7 | 6.6 | 10.90 |
| 1872 | 7.4 | 8.8 | 9.4 | 10.7 | 12.5 | 15.5 | 18.3 | 17.6 | 16.6 | 13.3 | 11.0 | 9.3 | 12.53 |
| 1873 | 8.3 | 5.2 | 7.6 | 9.2 | 11.1 | 14.9 | 17.5 | 18.1 | 15.9 | 13.9 | 10.6 | 9.8 | 11.84 |
| 1874 | 8.7 | 7.6 | 9.0 | 11.7 | 12.5 | 15.6 | 18.4 | 17.7 | 17.1 | 14.5 | 10.2 | 7.0 | 12.50 |
| 1875 | 8.6 | 6.0 | 6.8 | 10.5 | 13.3 | 15.8 | 17.0 | 18.4 | 17.9 | 12.9 | 9.5 | 7.3 | 12.00 |
| 1876 | 5.4 | 7.2 | 8.4 | 10.7 | 11.9 | 14.5 | 17.3 | 18.0 | 15.8 | 14.5 | 10.0 | 9.9 | 11.97 |
| 1877 | 9.4 | 9.2 | 7.9 | 9.8 | 11.2 | 15.6 | 17.4 | 17.6 | 14.9 | 13.1 | 11.2 | 8.6 | 12.16 |
| 1878 | 7.5 | 8.2 | 7.8 | 10.1 | 12.9 | 15.4 | 16.9 | 17.9 | 16.8 | 13.9 | 8.8 | 6.3 | 11.88 |
| 1879 | 3.4 | 5.5 | 6.8 | 8.7 | 10.6 | 14.4 | 15.3 | 16.7 | 15.9 | 13.1 | 8.8 | 5.7 | 10.41 |
| 1880 | 5.8 | 7.6 | 9.3 | 10.6 | 12.0 | 14.9 | 16.7 | 18.4 | 17.6 | 12.7 | 9.8 | 9.6 | 12.08 |
| 1881 | 4.7 | 6.9 | 8.5 | 9.2 | 12.3 | 14.9 | 18.3 | 16.9 | 16.1 | 11.3 | 11.5 | 8.9 | 11.63 |
| 1882 | 8.1 | 8.5 | 10.6 | 11.4 | 13.5 | 14.7 | 17.1 | 16.7 | 15.9 | 13.8 | 10.7 | 8.7 | 12.48 |
| 1883 | 8.6 | 9.1 | 7.1 | 10.3 | 12.5 | 15.0 | 16.6 | 17.1 | 16.4 | 13.6 | 11.3 | 9.0 | 12.22 |
| 1884 | 9.4 | 9.2 | 10.5 | 10.1 | 13.0 | 14.5 | 17.7 | 18.7 | 17.4 | 13.5 | 10.6 | 8.8 | 12.78 |
| 1885 | 6.3 | 9.2 | 8.8 | 10.6 | 11.8 | 14.7 | 17.1 | 16.8 | 15.6 | 12.0 | 9.5 | 8.0 | 11.70 |
| 1886 | 4.8 | 3.5 | 4.8 | 8.3 | 11.7 | 13.4 | 16.4 | 16.9 | 17.0 | 13.9 | 10.4 | 6.5 | 10.63 |
| 1887 | 3.9 | 5.1 | 4.4 | 7.1 | 9.6 | 13.4 | 17.0 | 17.3 | 14.7 | 10.7 | 7.7 | 5.8 | 9.73 |
| 1888 | 3.8 | 2.6 | 3.2 | 6.2 | 9.7 | 13.2 | 14.4 | 15.7 | 15.1 | 10.9 | 9.1 | 7.4 | 9.28 |
| 1889 | 5.1 | 3.7 | 4.6 | 7.6 | 12.0 | 14.9 | 16.0 | 16.4 | 14.6 | 11.9 | 8.8 | 4.9 | 10.04 |
| 1890 | 6.8 | 4.5 | 6.0 | 7.8 | 11.7 | 14.1 | 15.6 | 16.3 | 16.6 | 12.7 | 8.3 | 1.4 | 10.15 |
| 1891 | 2.2 | 4.3 | 4.2 | 7.0 | 10.1 | 13.6 | 15.7 | 16.0 | 16.4 | 13.2 | 8.5 | 7.5 | 9.89 |
| 1892 | 4.7 | 4.9 | 3.6 | 7.3 | 10.6 | 13.2 | 15.0 | 16.7 | 15.2 | 11.0 | 9.4 | 5.8 | 9.78 |
| 1893 | 2.8 | 5.7 | 7.6 | 9.6 | 12.4 | 14.9 | 16.9 | 18.5 | 15.9 | 13.7 | 7.9 | 7.0 | 11.08 |
| 1894 | 4.2 | 6.5 | 7.7 | 10.9 | 11.1 | 14.1 | 16.7 | 16.7 | 14.6 | 13.1 | 10.1 | 8.3 | 11.17 |
| 1895 | 3.1 | 1.1 | 4.1 | 7.1 | 10.3 | 13.6 | 16.2 | 17.2 | 17.6 | 11.8 | 10.0 | 5.9 | 9.83 |
| 1896 | 5.6 | 4.9 | 7.9 | 9.1 | 11.1 | 15.8 | 17.4 | 16.6 | 15.8 | 11.2 | 6.9 | 5.6 | 10.66 |
| 1897 | 2.9 | 5.1 | 7.4 | 8.4 | 10.6 | 14.5 | 16.3 | 17.7 | 14.9 | 12.6 | 9.3 | 6.7 | 10.53 |
| 1898 | 7.8 | 6.4 | 5.3 | 8.3 | 10.7 | 13.4 | 14.8 | 15.9 | 15.7 | 12.6 | 9.1 | 7.7 | 10.64 |
| 1899 | 6.0 | 5.4 | 5.0 | 7.3 | 10.6 | 14.2 | 17.6 | 18.7 | 16.4 | 13.0 | 11.8 | 4.9 | 10.91 |
| 1900 | 6.5 | 5.4 | 5.6 | 8.3 | 10.9 | 14.3 | 17.7 | 17.3 | 16.7 | 13.4 | 10.1 | 9.3 | 11.29 |
| 1901 | 5.2 | 3.8 | 5.1 | 8.5 | 10.8 | 14.3 | 17.4 | 18.2 | 16.8 | 13.8 | 9.8 | 7.2 | 10.91 |
| 1902 | 7.5 | 3.9 | 7.1 | 8.7 | 10.0 | 13.8 | 16.2 | 16.7 | 16.1 | 12.6 | 8.8 | 5.8 | 10.60 |
| 1903 | 6.4 | 8.0 | 8.9 | 8.0 | 11.6 | 13.5 | 16.2 | 16.7 | 16.0 | 13.8 | 10.2 | 5.6 | 11.24 |
| 1904 | 5.0 | 5.8 | 5.9 | 9.3 | 11.7 | 14.0 | 17.7 | 18.0 | 15.9 | 13.1 | 9.8 | 8.1 | 11.19 |
| 1905 | 5.6 | 6.1 | 8.0 | 8.9 | 11.5 | 15.2 | 17.8 | 17.8 | 15.8 | 10.7 | 8.3 | 6.8 | 11.04 |
| 1906 | 7.2 | 5.6 | 6.0 | 7.5 | 10.7 | 13.1 | 16.3 | 17.7 | 16.4 | 15.0 | 11.0 | 5.7 | 11.02 |
| 1907 | 5.1 | 3.6 | 5.8 | 7.9 | 11.3 | 13.5 | 14.5 | 16.4 | 16.2 | 14.0 | 10.8 | 7.5 | 10.55 |
| 1908 | 4.2 | 6.1 | 5.9 | 7.6 | 11.7 | 14.3 | 16.5 | 16.7 | 15.6 | 14.0 | 9.6 | 5.7 | 10.66 |
| 1909 | 5.9 | 4.1 | 4.7 | 8.6 | 11.0 | 13.0 | 15.3 | 16.9 | 15.4 | 14.1 | 9.1 | 6.6 | 10.39 |
| 1910 | 6.4 | 6.7 | 7.5 | 8.7 | 11.2 | 14.6 | 15.4 | 17.1 | 15.8 | 14.1 | 7.8 | 8.1 | 11.12 |
| 1911 | 5.1 | 5.7 | 6.2 | 6.9 | 11.3 | 14.0 | 17.1 | 19.1 | 17.5 | 12.9 | 9.0 | 8.2 | 11.08 |
| 1912 | 6.1 | 6.6 | 8.6 | 9.4 | 12.4 | 14.9 | 17.7 | 15.7 | 13.4 | 11.6 | 8.8 | 8.2 | 11.12 |
| 1913 | 6.3 | 6.5 | 7.7 | 8.8 | 12.1 | 14.0 | 14.8 | 16.2 | 16.0 | 14.0 | 11.6 | 7.9 | 11.33 |
| 1914 | 3.9 | 6.8 | 7.6 | 9.9 | 11.6 | 13.9 | 16.8 | 17.9 | 16.0 | 12.7 | 9.3 | 7.6 | 11.17 |
| 1915 | 6.0 | 5.7 | 5.8 | 7.5 | 10.0 | 13.2 | 15.6 | 16.4 | 15.4 | 11.7 | 6.9 | 7.6 | 10.15 |
| 1916 | 8.0 | 5.1 | 5.2 | 8.0 | 10.9 | 11.9 | 14.2 | 16.3 | 15.0 | 13.0 | 9.4 | 6.2 | 10.27 |
| 1917 | 2.9 | 2.6 | 2.9 | 4.6 | 9.4 | 12.8 | 14.9 | 15.7 | 15.5 | 10.8 | 9.6 | 5.7 | 8.95 |
| 1918 | 5.8 | 5.6 | 6.5 | 8.4 | 11.4 | 13.2 | 15.2 | 16.8 | 14.7 | 12.5 | 9.5 | 9.0 | 10.72 |
| 1919 | 6.0 | 3.8 | 5.3 | 6.8 | 10.7 | 12.8 | 13.4 | 15.4 | 14.9 | 11.4 | 4.3 | 4.6 | 9.12 |
| 1920 | 5.8 | 7.5 | 8.3 | 10.0 | 12.6 | 14.6 | 15.9 | 15.6 | 15.5 | 13.0 | 8.8 | 5.6 | 11.10 |
| 1921 | 8.5 | 6.5 | 8.2 | 9.1 | 12.2 | 14.5 | 17.3 | 17.6 | 16.9 | 16.1 | 6.6 | 7.1 | 11.72 |
| 1922 | 4.6 | 5.6 | 6.5 | 7.3 | 11.6 | 14.2 | 15.1 | 15.9 | 14.7 | 11.0 | 8.3 | 7.4 | 10.18 |
| 1923 | 6.8 | 6.5 | 7.6 | 8.9 | 10.8 | 11.7 | 16.5 | 16.8 | 15.5 | 12.9 | 7.6 | 5.6 | 10.60 |
| 1924 | 5.1 | 4.2 | 5.0 | 6.8 | 11.4 | 13.5 | 16.2 | 15.7 | 15.4 | 13.0 | 9.2 | 7.6 | 10.26 |
| 1925 | 7.1 | 7.2 | 6.5 | 8.6 | 12.1 | 14.1 | 16.8 | 17.1 | 14.6 | 13.2 | 7.8 | 5.9 | 10.92 |
| 1926 | 5.8 | 8.1 | 7.9 | 9.6 | 11.0 | 13.5 | 16.7 | 17.4 | 16.9 | 12.1 | 9.6 | 6.9 | 11.29 |
| 1927 | 7.2 | 6.2 | 8.4 | 9.4 | 11.1 | 13.5 | 15.9 | 17.1 | 15.5 | 13.5 | 9.0 | 3.8 | 10.88 |
| 1928 | 6.4 | 7.5 | 7.2 | 9.0 | 10.9 | 13.6 | 16.5 | 17.2 | 16.2 | 13.4 | 11.1 | 6.9 | 11.33 |
| 1929 | 3.6 | 0.7 | 4.5 | 5.7 | 9.8 | 12.5 | 15.6 | 16.6 | 17.3 | 13.1 | 9.7 | 8.5 | 9.80 |
| 1930 | 8.2 | 4.9 | 6.1 | 8.1 | 10.6 | 14.9 | 16.2 | 16.6 | 15.7 | 13.2 | 9.9 | 7.2 | 10.97 |
| 1931 | 6.1 | 5.1 | 4.4 | 7.2 | 11.0 | 13.8 | 15.9 | 15.9 | 14.1 | 12.5 | 9.8 | 7.6 | 10.28 |
| 1932 | 7.8 | 4.8 | 5.2 | 7.5 | 10.3 | 13.2 | 16.2 | 17.7 | 16.3 | 12.1 | 9.1 | 7.0 | 10.60 |
| 1933 | 4.4 | 5.1 | 7.2 | 8.7 | 11.2 | 14.1 | 16.9 | 18.3 | 17.2 | 13.4 | 8.5 | 3.3 | 10.69 |
| 1934 | 5.2 | 4.5 | 5.4 | 8.0 | 10.4 | 13.8 | 16.7 | 17.2 | 17.0 | 13.6 | 9.3 | 9.5 | 10.88 |
| 1935 | 6.5 | 6.4 | 6.1 | 8.1 | 9.8 | 14.6 | 16.5 | 18.0 | 16.2 | 12.7 | 10.2 | 6.0 | 10.93 |
| 1936 | 6.8 | 4.4 | 7.0 | 7.2 | 10.5 | 14.2 | 15.7 | 16.9 | 16.2 | 12.0 | 9.1 | 6.9 | 10.58 |
| 1937 | 6.2 | 7.0 | 5.5 | 8.7 | 11.5 | 14.4 | 16.3 | 17.5 | 15.9 | 13.7 | 9.4 | 5.9 | 11.00 |
| 1938 | 6.9 | 5.6 | 7.6 | 7.5 | 10.1 | 13.7 | 15.7 | 17.1 | 16.4 | 13.1 | 11.6 | 5.6 | 10.91 |
| 1939 | 6.5 | 6.2 | 6.3 | 8.4 | 10.3 | 13.6 | 16.3 | 17.5 | 16.0 | 12.2 | 10.9 | 6.0 | 10.85 |
| 1940 | 1.6 | 2.1 | |||||||||||
| 1941 | |||||||||||||
| 1942 | |||||||||||||
| 1943 | |||||||||||||
| 1944 | |||||||||||||
| 1945 | |||||||||||||
| 1946 | |||||||||||||
| 1947 | 2.4 | -1.5 | 3.2 | 8.1 | 12.2 | 15.2 | 17.8 | 19.5 | 18.7 | 13.6 | 10.7 | 8.3 | 10.68 |
| 1948 | 8.0 | 5.9 | 6.9 | 9.5 | 11.5 | 14.1 | 15.2 | 16.7 | 16.2 | 12.9 | 10.1 | 7.8 | 11.23 |
| 1949 | 7.2 | 6.6 | 5.1 | 8.5 | 9.8 | 12.8 | 16.1 | 17.4 | 18.4 | 14.2 | 9.1 | 7.9 | 11.09 |
| 1950 | 5.2 | 7.2 | 7.7 | 8.0 | 10.5 | 14.8 | 16.5 | 17.7 | 15.4 | 12.4 | 9.5 | 4.6 | 10.79 |
| 1951 | 6.1 | 6.2 | 4.9 | 7.0 | 9.9 | 12.9 | 15.6 | 16.7 | 16.3 | 12.7 | 11.3 | 8.7 | 10.69 |
| 1952 | 6.6 | 5.6 | 5.9 | 8.5 | 11.7 | 14.2 | 16.3 | 17.3 | 14.2 | 11.5 | 7.5 | 5.9 | 10.43 |
| 1953 | 5.4 | 5.1 | 4.9 | 7.3 | 10.5 | 13.0 | 15.4 | 16.8 | 15.9 | 14.0 | 10.9 | 9.3 | 10.71 |
| 1954 | 4.4 | 2.6 | 5.9 | 7.2 | 10.3 | 12.9 | 13.9 | 15.6 | 15.0 | 14.0 | 10.5 | 9.0 | 10.11 |
| 1955 | 4.0 | 3.4 | 3.6 | 6.5 | 9.0 | 12.6 | 15.0 | 17.4 | 16.7 | 12.9 | 10.6 | 8.6 | 10.03 |
| 1956 | 6.3 | 0.4 | 5.0 | 6.2 | 10.0 | 12.3 | 15.3 | 15.6 | 15.9 | 12.8 | 8.9 | 8.2 | 9.74 |
| 1957 | 7.1 | 7.4 | 8.9 | 9.0 | 10.6 | 14.3 | 16.8 | 16.9 | 15.0 | 13.7 | 9.8 | 7.3 | 11.40 |
| 1958 | 6.0 | 6.5 | 4.6 | 6.7 | 10.7 | 13.5 | 15.6 | 16.3 | 16.5 | 13.4 | 9.5 | 8.4 | 10.64 |
| 1959 | 5.5 | 4.3 | 6.9 | 9.1 | 11.3 | 14.0 | 16.8 | 18.0 | 17.5 | 15.0 | 9.9 | 8.3 | 11.38 |
| 1960 | 6.1 | 5.8 | 6.5 | 8.5 | 11.0 | 14.0 | 15.4 | 16.8 | 16.0 | 13.3 | 10.9 | 7.2 | 10.96 |
| 1961 | 5.6 | 7.6 | 8.1 | 9.8 | 11.2 | 14.1 | 15.8 | 16.5 | 16.8 | 14.3 | 9.4 | 6.0 | 11.27 |
| 1962 | 6.3 | 5.3 | 3.8 | 6.8 | 9.4 | 12.5 | 14.4 | 15.6 | 14.9 | 13.4 | 8.4 | 5.1 | 9.66 |
| 1963 | 0.0 | 0.0 | 3.9 | 6.8 | 9.4 | 12.6 | 14.8 | 15.6 | 15.1 | 12.4 | 11.2 | 4.9 | 8.89 |
| 1964 | 4.5 | 5.2 | 4.2 | 7.4 | 11.3 | 14.0 | 16.0 | 17.0 | 16.4 | 12.1 | 10.1 | 6.6 | 10.40 |
| 1965 | 5.7 | 4.5 | 4.9 | 7.3 | 10.6 | 13.1 | 14.7 | 16.0 | 15.1 | 13.8 | 7.6 | 7.5 | 10.07 |
| 1966 | 4.1 | 6.4 | 7.3 | 8.0 | 11.1 | 14.2 | 15.3 | 16.0 | 16.1 | 14.1 | 8.7 | 7.4 | 10.73 |
| 1967 | 5.7 | 6.9 | 8.0 | 8.0 | 11.0 | 13.2 | 16.8 | 17.2 | 16.2 | 13.9 | 9.2 | 7.0 | 11.09 |
| 1968 | 5.2 | 4.2 | 6.1 | 7.8 | 10.3 | 13.5 | 15.3 | 16.4 | 16.1 | 14.6 | 9.1 | 4.9 | 10.29 |
| 1969 | 7.2 | 3.8 | 4.7 | 7.4 | 11.2 | 13.6 | 16.2 | 17.2 | 16.6 | 15.4 | 9.9 | 4.8 | 10.67 |
| 1970 | 5.4 | 5.2 | 5.0 | 6.7 | 10.6 | 14.3 | 15.6 | 16.8 | 16.2 | 13.7 | 10.5 | 6.7 | 10.56 |
| 1971 | 5.5 | 6.8 | 5.9 | 7.9 | 11.0 | 12.6 | 15.9 | 16.9 | 16.1 | 13.8 | 9.4 | 8.3 | 10.84 |
| 1972 | 5.1 | 5.8 | 6.9 | 8.4 | 10.8 | 13.2 | 15.8 | 16.6 | 15.1 | 12.9 | 10.0 | 8.6 | 10.77 |
| 1973 | 6.8 | 6.4 | 7.6 | 7.7 | 11.1 | 14.4 | 16.7 | 18.1 | 16.9 | 13.5 | 9.6 | 6.7 | 11.29 |
| 1974 | 7.3 | 7.0 | 6.7 | 8.6 | 10.6 | 13.0 | 15.2 | 16.7 | 14.4 | 10.3 | 8.9 | 8.7 | 10.62 |
| 1975 | 8.0 | 6.2 | 5.8 | 6.8 | 9.6 | 12.6 | 15.9 | 18.2 | 16.4 | 12.0 | 9.3 | 7.4 | 10.68 |
| 1976 | 6.5 | 4.4 | 5.0 | 7.1 | 10.7 | 14.2 | 17.1 | 17.9 | 16.0 | 14.0 | 10.1 | 5.5 | 10.71 |
| 1977 | 5.6 | 7.0 | 7.9 | 7.8 | 10.8 | 12.6 | 15.3 | 16.3 | 15.6 | 14.2 | 10.1 | 8.1 | 10.94 |
| 1978 | 6.2 | 4.1 | 7.2 | 7.3 | 10.1 | 13.2 | 15.0 | 16.1 | 15.7 | 13.9 | 10.7 | 6.6 | 10.51 |
| 1979 | 2.8 | 2.8 | 5.8 | 7.9 | 10.5 | 13.3 | 15.9 | 16.4 | 15.8 | 14.1 | 10.4 | 8.9 | 10.38 |
| 1980 | 5.2 | 7.3 | 6.7 | 8.3 | 10.8 | 13.8 | 15.1 | 16.9 | 17.0 | 12.7 | 8.6 | 7.3 | 10.81 |
| 1981 | 6.0 | 4.5 | 7.7 | 8.2 | 11.2 | 13.0 | 15.2 | 16.4 | 16.6 | 13.5 | 10.3 | 4.8 | 10.62 |
| 1982 | 4.7 | 5.0 | 6.1 | 7.5 | 11.0 | 14.1 | 16.2 | 16.2 | 16.6 | 13.0 | 10.7 | 6.7 | 10.65 |
| 1983 | 8.7 | 3.7 | 6.3 | 8.2 | 10.1 | 13.5 | 16.9 | 17.5 | 15.8 | 13.8 | 10.3 | 7.3 | 11.01 |
| 1984 | 6.4 | 4.4 | 5.2 | 7.4 | 8.3 | 11.5 | 14.0 | 16.8 | 15.1 | 13.5 | 11.1 | 8.1 | 10.15 |
| 1985 | 1.4 | 1.6 | 3.7 | 7.2 | 9.6 | 11.7 | 15.3 | 15.2 | 15.2 | 13.0 | 6.2 | 7.6 | 8.98 |
| 1986 | 5.1 | -0.9 | 3.5 | 5.0 | 10.1 | 13.1 | 14.8 | 14.9 | 13.2 | 13.2 | 10.2 | 8.2 | 9.20 |
| 1987 | 1.2 | 3.7 | 3.0 | 8.5 | 8.1 | 11.4 | 14.8 | 15.4 | 15.5 | 12.7 | 9.3 | 6.8 | 9.20 |
| 1988 | 7.7 | 6.5 | 6.0 | 7.5 | 10.9 | 11.8 | 14.3 | 15.4 | 14.6 | 12.6 | 9.0 | 9.0 | 10.44 |
| 1989 | 7.4 | 6.8 | 8.4 | 6.4 | 11.4 | 12.7 | 15.3 | 16.1 | 15.7 | 13.5 | 8.5 | 7.2 | 10.78 |
| 1990 | 6.8 | 7.8 | |||||||||||
| Average | 5.77 | 5.51 | 6.42 | 8.33 | 11.10 | 13.87 | 16.18 | 16.99 | 16.01 | 13.12 | 9.50 | 7.08 | 10.82 |
| St.Dev. | 1.76 | 2.06 | 1.65 | 1.30 | 1.04 | 1.01 | 1.11 | 0.94 | 0.97 | 1.02 | 1.20 | 1.51 | 0.78 |
| As standard position 51°39'N 2°34'E has been chosen. All observations on different positions have been corrected to this position. Missing observations have been completed using the observation of the remaining light vessels by means of the deviations wrt the normal. The only remaining gap is that of 1940 till 1946. The monthly averages as from 1983 have been obtained by reduction of those of Goeree to Noordhinder. | |||||||||||||