All values are given in inches
| Year | Jan | Feb | Mar | April | May | June | July | Aug | Sept | Oct | Nov | Dec | Annual |
| 1851 | 9.97 | 1.87 | 9.95 | 7.72 | 2.21 | 3.82 | 1.24 | ||||||
| 1852 | 0.75 | 4.60 | 3.60 | 3.80 | 7.00 | 7.50 | 4.47 | 6.70 | 9.60 | 3.60 | 1.25 | 0.75 | 53.62 |
| 1853 | 2.00 | 0.60 | 2.50 | 0.45 | 1.52 | 3.24 | 7.40 | 2.70 | 9.45 | 9.70 | 2.25 | 3.95 | 45.76 |
| 1854 | 3.02 | 2.15 | 1.31 | 4.35 | 4.45 | 5.80 | 6.67 | 8.90 | 10.40 | 1.50 | 3.55 | 4.20 | 56.30 |
| 1855 | 1.45 | 1.50 | 5.35 | 1.15 | 1.00 | 5.42 | 2.15 | 6.15 | 4.34 | 2.55 | 2.72 | 4.10 | 37.88 |
| 1856 | 5.90 | 3.05 | 5.75 | 1.33 | 4.05 | 4.42 | 10.85 | 7.25 | 1.10 | 2.20 | 3.48 | 2.93 | 52.31 |
| 1857 | 1.17 | 0.60 | 2.92 | 2.81 | 2.40 | 3.75 | 9.20 | 10.55 | 3.78 | 2.01 | 1.45 | 6.30 | 46.94 |
| 1858 | 3.15 | 5.38 | 3.55 | 1.25 | 3.00 | 1.06 | 7.66 | 3.51 | 10.48 | 2.00 | 2.15 | 2.35 | 45.54 |
| 1859 | 1.98 | 2.30 | 5.45 | 2.15 | 1.45 | 1.95 | 6.75 | 12.15 | 5.05 | 2.50 | 3.35 | 1.80 | 46.88 |
| 1860 | 0.35 | 4.60 | 2.70 | 2.70 | 3.75 | 3.40 | 6.40 | 8.05 | 17.50 | 7.95 | 0.55 | 2.05 | 60.00 |
| 1861 | 2.55 | 0.80 | 3.95 | 3.48 | 1.56 | 9.95 | 7.85 | 4.45 | 3.20 | 0.80 | 1.00 | ||
| 1862 | |||||||||||||
| 1863 | |||||||||||||
| 1864 | |||||||||||||
| 1865 | |||||||||||||
| 1866 | 4.20 | 3.65 | 1.70 | 2.95 | 4.12 | 10.50 | 2.25 | 3.15 | 0.10 | 1.60 | |||
| 1867 | 4.62 | 4.95 | 4.10 | 1.85 | 2.85 | 10.49 | 11.07 | 8.00 | 14.60 | 4.70 | 0.40 | 0.93 | 68.56 |
| 1868 | 2.80 | 2.25 | 1.35 | 2.82 | 3.85 | 12.40 | 7.70 | 4.70 | 6.15 | 3.20 | 0.25 | 2.05 | 49.52 |
| 1869 | 4.05 | 7.45 | 2.40 | 4.25 | 0.81 | 7.66 | 5.51 | 5.60 | 7.00 | 4.15 | 1.65 | 3.65 | 54.18 |
| 1870 | 1.05 | 2.25 | 5.40 | 3.20 | 1.50 | 8.15 | 2.65 | 4.40 | 9.35 | 7.10 | 5.29 | 1.95 | 52.29 |
| 1871 | 0.80 | 1.80 | 7.15 | 0.60 | 4.65 | 16.75 | 3.95 | 13.70 | 7.50 | 3.62 | 3.53 | 2.65 | 66.70 |
| 1872 | 3.44 | 2.70 | 7.32 | 2.43 | 1.25 | 6.67 | 2.92 | 6.41 | 10.79 | 6.37 | 1.76 | 4.81 | 56.87 |
| 1873 | 3.96 | 0.59 | 5.29 | 0.56 | 5.52 | 8.41 | 7.75 | 6.21 | 10.47 | 5.65 | 2.88 | 3.38 | 60.67 |
| 1874 | 0.82 | 7.33 | 2.13 | 1.60 | 5.38 | 5.92 | 7.48 | 6.89 | 7.07 | 0.10 | 2.94 | 0.65 | 48.31 |
| 1875 | 4.48 | 8.93 | 1.80 | 2.98 | 9.08 | 5.41 | 0.14 | 10.19 | 4.50 | 4.49 | 2.18 | 3.42 | 57.60 |
| 1876 | 0.61 | 3.05 | 5.41 | 7.89 | 1.87 | 4.17 | 2.82 | 8.07 | 3.73 | 8.92 | 2.60 | 6.12 | 55.26 |
| 1877 | 2.65 | 1.09 | 2.53 | 3.01 | 2.47 | 10.47 | 4.82 | 4.82 | 5.15 | 6.75 | 4.49 | 3.32 | 51.57 |
| 1878 | 3.14 | 5.32 | 2.37 | 5.38 | 1.52 | 5.03 | 4.63 | 2.85 | 21.12 | 3.81 | 1.39 | 3.86 | 60.42 |
| 1879 | 0.63 | 3.51 | 1.35 | 2.97 | 4.25 | 1.25 | 5.44 | 8.39 | 8.24 | 9.45 | 1.24 | 0.46 | 47.18 |
| 1880 | 3.17 | 6.17 | 1.69 | 1.50 | 6.24 | 3.00 | 5.94 | 8.96 | 5.21 | 16.25 | 6.09 | 1.29 | 65.51 |
| 1881 | 9.12 | 1.12 | 2.89 | 4.57 | 2.61 | 2.82 | 7.61 | 10.23 | 4.58 | 2.87 | 3.41 | 2.86 | 54.69 |
| 1882 | 2.58 | 1.09 | 0.89 | 5.23 | 2.20 | 5.14 | 5.75 | 5.65 | 4.39 | 10.30 | 5.70 | 4.34 | 53.26 |
| 1883 | 4.77 | 0.48 | 3.84 | 4.48 | 3.16 | 7.05 | 6.88 | 7.63 | 7.28 | 7.26 | 0.09 | 0.42 | 53.34 |
| 1884 | 4.78 | 2.45 | 2.63 | 2.32 | 5.45 | 6.89 | 6.02 | 5.21 | 5.68 | 4.12 | 5.43 | 4.04 | 55.02 |
| 1885 | 7.18 | 5.23 | 5.66 | 1.24 | 7.74 | 8.98 | 7.16 | 7.56 | 19.63 | 3.36 | 0.50 | 7.76 | 82.00 |
| 1886 | 2.81 | 1.87 | 6.74 | 3.08 | 2.81 | 4.78 | 14.97 | 6.25 | 4.91 | 2.47 | 0.97 | 3.20 | 54.86 |
| 1887 | 4.34 | 0.34 | 3.51 | 4.15 | 7.15 | 9.68 | 8.90 | 5.76 | 9.40 | 1.57 | 0.10 | 3.70 | 58.60 |
| 1888 | 0.49 | 4.38 | 1.57 | 0.93 | 5.46 | 2.92 | 8.30 | 4.89 | 11.15 | 6.00 | 4.16 | 2.88 | 53.13 |
| 1889 | 5.89 | 3.85 | 1.38 | 3.95 | 0.51 | 6.89 | 8.24 | 5.25 | 8.49 | 1.26 | 0.51 | 0.00 | 46.22 |
| 1890 | 0.63 | 0.51 | 2.89 | 0.95 | 9.20 | 1.80 | 9.70 | 4.26 | 4.88 | 9.07 | 2.26 | 1.37 | 47.52 |
| 1891 | 1.19 | 0.32 | 4.02 | 1.72 | 2.78 | 3.31 | 4.08 | 3.67 | 10.83 | 4.43 | 1.53 | 3.46 | 41.34 |
| 1892 | 3.99 | 0.77 | 0.76 | 0.11 | 1.34 | 6.38 | 3.16 | 4.84 | 14.04 | 3.34 | 0.64 | 2.52 | 41.89 |
| 1893 | 0.98 | 6.87 | 8.90 | 2.67 | 4.18 | 4.66 | 4.54 | 10.02 | 6.09 | 4.48 | 1.76 | 3.08 | 58.23 |
| 1894 | 2.29 | 3.44 | 3.12 | 0.83 | 1.49 | 4.93 | 7.10 | 9.24 | 16.63 | 3.24 | 3.72 | 0.81 | 56.84 |
| 1895 | 4.63 | 3.61 | 3.63 | 4.40 | 2.26 | 4.98 | 11.21 | 2.54 | 4.66 | 0.58 | 3.12 | 1.18 | 46.80 |
| 1896 | 2.53 | 1.66 | 2.51 | 0.49 | 1.24 | 9.41 | 4.25 | 6.16 | 2.19 | 3.03 | 4.55 | 2.17 | 40.19 |
| 1897 | 1.89 | 7.10 | 1.60 | 5.18 | 1.35 | 5.01 | 3.67 | 6.27 | 16.23 | 6.00 | 1.56 | 4.83 | 60.69 |
| 1898 | 0.43 | 2.10 | 2.04 | 2.45 | 1.81 | 2.13 | 12.03 | 5.44 | 3.46 | 6.74 | 2.34 | 4.74 | 45.71 |
| 1899 | 3.98 | 3.38 | 1.35 | 3.21 | 1.86 | 4.52 | 6.12 | 3.90 | 5.10 | 2.73 | 0.07 | 2.35 | 38.57 |
| 1900 | 1.71 | 3.17 | 7.95 | 7.34 | 2.90 | 8.45 | 3.83 | 2.07 | 4.33 | 7.14 | 1.06 | 3.90 | 53.85 |
| 1901 | 2.64 | 6.76 | 6.57 | 1.08 | 5.31 | 9.64 | 4.26 | 6.12 | 7.38 | 1.37 | 0.36 | 2.73 | 54.22 |
| 1902 | 0.08 | 3.64 | 4.20 | 2.02 | 1.82 | 3.65 | 6.69 | 4.74 | 12.78 | 5.90 | 4.18 | 5.82 | 55.52 |
| 1903 | 4.44 | 5.23 | 2.55 | 1.54 | 14.80 | 3.22 | 2.54 | 6.60 | 2.80 | 2.83 | 3.82 | 1.66 | 52.03 |
| 1904 | 6.77 | 2.70 | 1.35 | 0.81 | 2.90 | 4.92 | 5.25 | 2.74 | 6.09 | 11.70 | 2.26 | 1.68 | 49.17 |
| 1905 | 1.80 | 4.65 | 6.47 | 2.02 | 6.68 | 2.72 | 5.14 | 10.97 | 6.18 | 2.89 | 0.60 | 5.65 | 55.77 |
| 1906 | 3.46 | 3.06 | 1.03 | 0.30 | 14.31 | 4.58 | 8.96 | 5.38 | 2.29 | 2.39 | 0.01 | 1.09 | 46.86 |
| 1907 | 0.14 | 0.55 | 0.76 | 5.27 | 5.40 | 2.71 | 5.55 | 6.53 | 10.44 | 1.37 | 1.96 | 4.39 | 45.07 |
| 1908 | 2.24 | 2.98 | 1.16 | 2.93 | 3.07 | 4.35 | 9.68 | 2.90 | 21.79 | 2.97 | 0.47 | 0.90 | 55.44 |
| 1909 | 1.17 | 1.51 | 4.24 | 1.80 | 2.26 | 8.93 | 8.43 | 5.18 | 4.98 | 0.08 | 0.99 | 2.30 | 41.87 |
| 1910 | 1.06 | 2.43 | 1.89 | 0.60 | 2.18 | 6.72 | 6.13 | 5.82 | 3.12 | 8.02 | 1.64 | 1.07 | 40.68 |
| 1911 | 0.89 | 0.13 | 2.16 | 0.36 | 3.33 | 2.96 | 2.35 | 10.16 | 0.90 | 5.26 | 2.68 | 4.20 | 35.38 |
| 1912 | 4.76 | 2.65 | 3.27 | 4.96 | 3.53 | 9.62 | 6.74 | 5.32 | 7.69 | 3.17 | 0.82 | 2.91 | 55.44 |
| 1913 | 1.53 | 4.87 | 5.87 | 1.32 | 1.06 | 4.55 | 6.28 | 3.32 | 3.74 | 1.35 | 0.32 | 4.49 | 38.70 |
| 1914 | 3.31 | 4.55 | 1.84 | 0.30 | 2.00 | 1.32 | 5.13 | 8.47 | 6.39 | 2.34 | 3.87 | 5.20 | 44.72 |
| 1915 | 4.10 | 2.44 | 2.47 | 0.49 | 3.67 | 1.55 | 9.36 | 4.08 | 8.41 | 5.45 | 1.07 | 3.46 | 46.55 |
| 1916 | 0.90 | 0.19 | 0.59 | 0.46 | 3.32 | 6.45 | 3.93 | 6.76 | 5.25 | 4.77 | 2.76 | 7.47 | 42.85 |
| 1917 | 0.41 | 1.46 | 1.81 | 0.82 | 1.83 | 3.03 | 10.36 | 6.65 | 3.47 | 0.38 | 0.23 | 2.11 | 32.56 |
| 1918 | 2.78 | 0.21 | 2.31 | 5.96 | 2.50 | 3.32 | 3.35 | 3.12 | 6.17 | 3.97 | 3.26 | 2.60 | 39.55 |
| 1919 | 1.73 | 3.77 | 3.24 | 1.26 | 7.32 | 13.79 | 6.32 | 6.96 | 5.63 | 1.81 | 1.06 | 4.61 | 57.50 |
| 1920 | 1.21 | 9.16 | 0.82 | 3.42 | 7.41 | 8.27 | 5.47 | 7.46 | 7.14 | 0.11 | 5.38 | 3.35 | 59.20 |
| 1921 | 2.04 | 0.62 | 0.57 | 1.23 | 4.02 | 2.71 | 9.76 | 7.70 | 1.73 | 6.37 | 2.27 | 1.60 | 40.62 |
| 1922 | 3.21 | 5.56 | 3.69 | 1.39 | 7.18 | 5.88 | 3.91 | 7.71 | 6.70 | 8.84 | 0.58 | 2.54 | 57.19 |
| 1923 | 1.37 | 1.93 | 1.15 | 0.98 | 8.73 | 4.94 | 5.14 | 4.67 | 4.89 | 4.75 | 0.06 | 1.38 | 39.99 |
| 1924 | 5.09 | 2.65 | 7.18 | 3.00 | 0.49 | 4.21 | 12.17 | 3.55 | 8.88 | 8.08 | 0.38 | 1.15 | 56.83 |
| 1925 | 4.52 | 0.90 | 1.14 | 1.54 | 4.75 | 5.65 | 5.22 | 5.63 | 2.41 | 3.13 | 1.51 | 6.98 | 43.38 |
| 1926 | 4.89 | 1.66 | 2.20 | 3.89 | 1.66 | 9.33 | 10.81 | 3.18 | 9.55 | 2.22 | 3.37 | 1.58 | 54.34 |
| 1927 | 0.40 | 3.54 | 1.67 | 0.18 | 0.09 | 7.56 | 6.85 | 1.98 | 2.39 | 2.20 | 0.83 | 2.75 | 30.44 |
| 1928 | 0.68 | 3.54 | 4.38 | 8.19 | 2.33 | 4.10 | 8.96 | 5.85 | 9.25 | 2.33 | 0.67 | 1.34 | 51.62 |
| 1929 | 3.96 | 1.28 | 2.14 | 5.09 | 6.09 | 4.10 | 8.21 | 6.02 | 8.58 | 0.83 | 0.08 | 3.02 | 49.40 |
| 1930 | 2.55 | 2.61 | 10.00 | 1.86 | 3.70 | 10.13 | 4.74 | 0.76 | 3.62 | 1.57 | 2.69 | 3.11 | 47.34 |
| 1931 | 3.36 | 1.49 | 4.69 | 3.41 | 5.93 | 2.97 | 2.20 | 4.86 | 0.07 | 1.86 | 0.97 | 2.57 | 34.38 |
| 1932 | 0.40 | 1.12 | 5.05 | 3.20 | 2.25 | 23.32 | 6.92 | 4.26 | 6.61 | 2.62 | 5.55 | 0.49 | 61.79 |
| 1933 | 2.18 | 3.23 | 2.97 | 7.16 | 3.04 | 6.84 | 10.80 | 4.68 | 3.76 | 11.99 | 0.95 | 0.72 | 58.32 |
| 1934 | 1.08 | 3.48 | 2.18 | 2.92 | 6.33 | 13.23 | 5.07 | 5.98 | 1.99 | 5.24 | 0.31 | 0.70 | 48.51 |
| 1935 | 2.77 | 1.69 | 1.13 | 2.66 | 5.28 | 3.03 | 9.87 | 9.07 | 9.15 | 0.40 | 0.31 | 1.34 | 46.70 |
| 1936 | 1.82 | 5.11 | 2.93 | 1.77 | 2.38 | 6.15 | 5.88 | 5.99 | 1.61 | 12.62 | 0.79 | 1.98 | 49.03 |
| 1937 | 4.52 | 4.05 | 2.49 | 4.01 | 1.24 | 4.73 | 9.69 | 10.78 | 7.87 | 2.61 | 2.57 | 0.64 | 55.20 |
| 1938 | 5.21 | 1.41 | 1.55 | 1.81 | 7.04 | 7.57 | 9.99 | 9.15 | 5.91 | 11.21 | 0.47 | 0.68 | 62.00 |
| 1939 | 1.76 | 2.49 | 1.43 | 4.62 | 4.34 | 4.82 | 7.71 | 5.97 | 5.89 | 4.06 | 2.05 | 2.13 | 47.27 |
| 1940 | 2.94 | 4.28 | 1.05 | 3.28 | 2.28 | 9.34 | 8.43 | 6.59 | 2.87 | 0.10 | 0.29 | 5.61 | 47.06 |
| 1941 | 1.97 | 3.14 | 2.18 | 0.99 | 1.04 | 8.10 | 6.72 | 4.89 | 9.35 | 9.00 | 3.57 | 7.71 | 58.66 |
| 1942 | 3.13 | 4.70 | 6.05 | 0.14 | 1.04 | 7.99 | 3.98 | 3.22 | 8.47 | 0.68 | 0.51 | 2.22 | 42.13 |
| 1943 | 1.32 | 0.52 | 3.73 | 1.25 | 4.91 | 5.72 | 9.22 | 7.79 | 7.07 | 0.48 | 1.68 | 1.60 | 45.29 |
| 1944 | 3.77 | 1.79 | 7.60 | 6.57 | 2.50 | 6.38 | 14.20 | 8.03 | 5.61 | 10.04 | 1.19 | 0.31 | 67.99 |
| 1945 | 5.26 | 0.90 | 0.12 | 3.08 | 3.26 | 8.00 | 8.99 | 11.65 | 14.27 | 2.58 | 0.53 | 7.63 | 66.27 |
| 1946 | 2.15 | 1.17 | 2.98 | 2.70 | 5.14 | 4.01 | 10.05 | 11.75 | 3.26 | 4.13 | 2.38 | 0.14 | 49.86 |
| 1947 | 4.51 | 4.36 | 5.11 | 4.22 | 3.01 | 9.02 | 7.61 | 4.93 | 15.80 | 13.50 | 7.12 | 3.08 | 82.27 |
| 1948 | 6.16 | 1.33 | 12.52 | 2.87 | 2.12 | 5.18 | 8.68 | 7.27 | 6.79 | 4.43 | 0.63 | 3.78 | 61.76 |
| 1949 | 1.46 | 6.04 | 0.99 | 4.86 | 3.17 | 3.17 | 5.12 | 11.51 | 11.42 | 2.48 | 2.50 | 1.05 | 53.77 |
| 1950 | 0.06 | 1.79 | 3.88 | 3.70 | 2.87 | 2.19 | 10.68 | 2.68 | 16.74 | 11.45 | 0.68 | 1.90 | 58.62 |
| 1951 | 0.53 | 1.71 | 2.28 | 1.23 | 1.46 | 3.86 | 6.69 | 2.19 | 10.11 | 1.41 | 2.28 | 1.80 | 35.55 |
| 1952 | 0.80 | 3.89 | 3.91 | 2.49 | 9.49 | 3.99 | 3.85 | 9.57 | 6.39 | 2.46 | 0.64 | 1.27 | 48.75 |
| 1953 | 3.68 | 1.94 | 2.21 | 6.79 | 0.61 | 3.02 | 9.30 | 12.36 | 9.55 | 5.34 | 1.74 | 7.08 | 63.62 |
| 1954 | 0.85 | 1.74 | 1.47 | 0.37 | 0.73 | 3.26 | 5.71 | 4.06 | 8.73 | 6.23 | 1.68 | 2.00 | 36.83 |
| 1955 | 3.09 | 2.46 | 1.66 | 1.50 | 4.51 | 2.70 | 5.53 | 3.85 | 10.56 | 5.36 | 1.90 | 0.21 | 43.33 |
| 1956 | 2.91 | 2.94 | 0.81 | 2.33 | 3.98 | 7.87 | 8.25 | 5.24 | 2.89 | 13.44 | 0.38 | 0.04 | 51.08 |
| 1957 | 0.33 | 1.69 | 3.87 | 1.61 | 5.25 | 7.10 | 12.34 | 3.30 | 8.33 | 3.50 | 1.55 | 1.31 | 50.18 |
| 1958 | 3.39 | 3.74 | 3.38 | 8.24 | 3.79 | 3.96 | 4.37 | 4.67 | 4.75 | 5.07 | 2.02 | 2.76 | 50.14 |
| 1959 | 2.97 | 5.22 | 9.75 | 2.65 | 9.20 | 2.94 | 4.51 | 2.86 | 5.67 | 3.12 | 2.24 | 0.95 | 52.08 |
| 1960 | 2.07 | 5.17 | 6.94 | 3.54 | 1.18 | 4.70 | 16.21 | 6.50 | 8.57 | 2.95 | 0.11 | 1.51 | 59.45 |
| 1961 | 2.87 | 4.85 | 1.17 | 4.16 | 3.06 | 5.27 | 3.48 | 10.64 | 1.02 | 0.27 | 0.89 | 0.47 | 38.15 |
| 1962 | 2.16 | 0.52 | 3.10 | 2.36 | 1.12 | 8.22 | 6.31 | 10.07 | 4.37 | 1.13 | 2.08 | 2.46 | 43.90 |
| 1963 | 5.39 | 6.93 | 2.23 | 1.75 | 1.74 | 12.49 | 6.47 | 4.95 | 4.88 | 1.53 | 2.70 | 3.60 | 54.66 |
| 1964 | 7.29 | 6.55 | 1.76 | 4.65 | 4.80 | 4.67 | 6.12 | 5.63 | 10.31 | 5.09 | 3.33 | 4.83 | 65.03 |
| 1965 | 0.65 | 5.50 | 3.91 | 0.95 | 0.94 | 9.79 | 2.71 | 9.58 | 11.02 | 1.75 | 1.92 | 3.75 | 52.47 |
| 1966 | 4.56 | 5.97 | 0.71 | 2.25 | 10.43 | 7.74 | 11.09 | 3.88 | 5.94 | 1.38 | 0.21 | 1.14 | 55.30 |
| 1967 | 3.05 | 4.35 | 0.81 | 2.00 | 1.18 | 12.90 | 5.22 | 12.31 | 1.80 | 1.13 | 0.24 | 4.69 | 49.68 |
| 1968 | 0.82 | 3.05 | 1.20 | 0.99 | 2.17 | 12.25 | 6.84 | 16.24 | 2.68 | 5.09 | 1.30 | 1.09 | 53.72 |
| 1969 | 0.84 | 3.39 | 4.23 | 0.34 | 3.78 | 5.12 | 5.89 | 15.10 | 10.33 | 9.81 | 4.56 | 3.87 | 67.26 |
| 1970 | 4.18 | 8.85 | 9.98 | 1.77 | 1.84 | 2.65 | 7.60 | 10.96 | 3.20 | 3.95 | 0.00 | 1.57 | 56.55 |
| 1971 | 2.01 | 2.55 | 2.41 | 4.07 | 1.90 | 5.52 | 5.07 | 12.83 | 4.17 | 6.46 | 0.83 | 5.87 | 53.69 |
| 1972 | 5.77 | 3.48 | 4.43 | 2.98 | 8.26 | 6.75 | 3.15 | 9.76 | 2.60 | 4.46 | 4.22 | 1.43 | 57.29 |
| 1973 | 4.64 | 5.07 | 10.18 | 11.61 | 5.33 | 4.10 | 5.45 | 7.49 | 7.86 | 4.08 | 0.44 | 4.32 | 70.57 |
| 1974 | 0.28 | 1.28 | 3.47 | 1.53 | 4.14 | 5.53 | 9.83 | 11.23 | 8.13 | 0.34 | 1.03 | 1.73 | 48.52 |
| 1975 | 3.48 | 2.58 | 2.46 | 5.78 | 7.00 | 5.21 | 6.36 | 6.23 | 5.24 | 3.63 | 0.39 | 1.79 | 50.15 |
| 1976 | 2.29 | 1.05 | 3.41 | 0.63 | 10.02 | 4.26 | 5.41 | 6.37 | 8.56 | 1.63 | 2.43 | 4.81 | 50.87 |
| 1977 | 2.96 | 3.24 | 1.03 | 1.76 | 3.07 | 2.65 | 1.97 | 7.26 | 7.45 | 1.68 | 3.11 | 3.38 | 39.56 |
| 1978 | 4.64 | 4.17 | 2.83 | 2.24 | 9.18 | 2.62 | 6.67 | 2.39 | 4.40 | 1.26 | 0.80 | 1.84 | 43.04 |
| 1979 | 6.28 | 3.75 | 1.00 | 4.18 | 7.54 | 5.91 | 4.67 | 4.78 | 17.75 | 0.25 | 3.64 | 2.01 | 61.76 |
| 1980 | 2.61 | 1.06 | 6.83 | 3.91 | 3.02 | 4.59 | 5.29 | 3.97 | 3.03 | 2.69 | 2.32 | 0.21 | 39.53 |
| 1981 | 0.92 | 4.53 | 5.41 | 0.32 | 1.48 | 3.31 | 2.46 | 6.47 | 1.22 | 1.35 | 4.92 | 3.38 | 35.77 |
| 1982 | 3.00 | 1.67 | 4.26 | 3.60 | 3.55 | 8.06 | 3.81 | 6.93 | 9.32 | 3.37 | 1.93 | 2.02 | 51.52 |
| 1983 | 7.19 | 4.27 | 8.46 | 4.65 | 1.38 | 6.86 | 6.11 | 4.63 | 4.61 | 4.29 | 3.32 | 6.42 | 62.19 |
| 1984 | 2.13 | 4.67 | 5.77 | 3.14 | 1.46 | 4.76 | 6.01 | 3.78 | 12.28 | 1.53 | 3.30 | 0.13 | 48.96 |
| 1985 | 1.05 | 1.45 | 1.26 | 2.76 | 2.08 | 3.71 | 6.33 | 8.93 | 16.82 | 8.34 | 2.07 | 3.59 | 58.39 |
| 1986 | 4.19 | 4.72 | 5.44 | 0.93 | 2.13 | 2.53 | 3.27 | 9.60 | 1.99 | 1.80 | 2.85 | 4.65 | 44.10 |
| 1987 | 4.09 | 6.47 | 6.27 | 0.14 | 0.75 | 4.18 | 4.40 | 4.48 | 7.13 | 0.30 | 5.02 | 0.16 | 43.39 |
| 1988 | 6.36 | 6.08 | 2.65 | 3.44 | 1.35 | 3.71 | 4.50 | 8.48 | 16.36 | 2.35 | 4.27 | 1.13 | 60.68 |
| 1989 | 1.73 | 1.77 | 2.14 | 2.79 | 1.55 | 3.66 | 8.98 | 9.16 | 14.37 | 1.39 | 0.51 | 3.40 | 51.45 |
| 1990 | 1.84 | 4.07 | 1.59 | 1.34 | 0.18 | 1.59 | 6.53 | 3.81 | 2.60 | 4.54 | 1.17 | 1.94 | 31.20 |
| 1991 | 10.20 | 1.52 | 7.33 | 6.31 | 9.35 | 11.70 | 15.90 | 3.48 | 6.20 | 6.36 | 0.71 | 0.57 | 79.63 |
| 1992 | 5.79 | 2.64 | 4.09 | 5.33 | 5.97 | 7.04 | 3.32 | 10.76 | 7.33 | 8.34 | 1.92 | 0.65 | 63.18 |
| 1993 | 3.86 | 2.89 | 5.98 | 0.85 | 1.60 | 2.52 | 7.54 | 2.96 | 7.60 | 8.84 | 3.58 | 1.90 | 50.12 |
| 1994 | 6.58 | 0.92 | 2.14 | 1.51 | 3.15 | 13.96 | 8.26 | 3.29 | 9.79 | 10.23 | 3.49 | 3.94 | 67.26 |
| 1995 | 1.91 | 2.07 | 3.67 | 1.77 | 1.77 | 5.35 | 9.45 | 9.93 | 5.41 | 3.53 | 3.20 | 2.19 | 50.25 |
| 1996 | 1.11 | 1.11 | 6.83 | 2.85 | 0.72 | 11.41 | 4.20 | 7.83 | 8.49 | 11.46 | 1.39 | 3.23 | 60.63 |
| 1997 | 2.91 | 1.28 | 1.84 | 4.56 | 3.43 | 6.33 | 7.69 | 8.24 | 3.97 | 4.84 | 2.41 | 9.77 | 57.27 |
| 1998 | 3.49 | 11.12 | 2.64 | 4.71 | 0.96 | 2.95 | 7.29 | 10.09 | 7.65 | 3.01 | 2.39 | 0.42 | 56.72 |
| 1999 | 4.63 | 1.70 | 0.40 | 1.92 | 1.02 | 7.75 | 3.56 | 3.51 | 13.00 | 3.24 | 0.83 | 0.88 | 42.44 |
| 2000 | 2.77 | 1.17 | 1.79 | 2.60 | 1.15 | 2.43 | 5.69 | 7.38 | 11.64 | 0.23 | 1.55 | 1.37 | 39.77 |
| 2001 | 0.91 | 0.68 | 5.48 | &0.62 | 2.56 | 5.59 | 8.31 | 3.58 | 16.03 | 0.81 | 1.44 | 3.13 | 49.14 |
| 2002 | 4.48 | 0.82 | 4.38 | 2.41 | 0.47 | 6.24 | 7.80 | 8.14 | 9.31 | 2.58 | 2.68 | 5.41 | 54.72 |
| 2003 | 0.07 | 4.66 | 10.71 | 2.63 | 2.54 | 6.75 | 7.33 | 1.83 | 3.04 | 2.98 | 0.74 | 1.19 | 44.47 |
| 2004 | 1.64 | 4.47 | 1.36 | 2.02 | 1.24 | 17.15 | 8.60 | 9.85 | 16.31 | 1.32 | 2.85 | 2.66 | 69.47 |
| 2005 | 1.90 | 3.56 | 3.67 | 4.54 | 3.51 | 14.79 | 7.37 | 4.43 | 5.76 | 6.49 | 1.05 | 7.38 | 64.45 |
| 2006 | 2.30 | 3.91 | 0.68 | 1.22 | 2.01 | 7.25 | 3.97 | 7.08 | 4.55 | 1.81 | 0.39 | 2.90 | 38.07 |
| 2007 | 2.32 | 2.40 | 2.22 | 1.02 | 1.12 | 6.68 | 9.48 | 3.57 | 5.44 | 8.85 | 0.17 | 2.74 | 46.01 |
| 2008 | 2.63 | 5.22 | 3.50 | 2.34 | 0.66 | 8.21 | 8.73 | 16.83 | 5.84 | 1.62 | 1.01 | 0.59 | 57.18 |
| 2009 | 3.01 | 0.98 | 4.79 | 5.90 | 13.51 | 3.24 | 5.49 | 7.05 | 6.48 | 2.02 | 0.85 | 5.88 | 59.20 |
| 2010 | 3.96 | 2.71 | 1.87 | 1.01 | 1.65 | 3.73 | 3.98 | 7.74 | 5.11 | 0.00 | 1.30 | 0.34 | 33.40 |
| 2011 | 5.75 | 4.05 | 2.43 | 1.17 | 2.04 | 6.07 | 7.39 | 5.05 | 6.57 | 4.09 | 1.48 | 1.84 | 47.96 |
| 2012 | 0.09 | 1.14 | 2.17 | 1.47 | 10.05 | 16.59 | 3.36 | 6.38 | 6.59 | 3.01 | 0.27 | 2.32 | 53.44 |
| 2013 | 1.01 | 4.72 | 3.07 | 3.06 | 5.39 | 4.53 | 8.65 | 5.96 | 3.58 | 1.57 | 2.84 | 0.86 | 45.24 |
| 2014 | 6.97 | 2.74 | 4.65 | 6.00 | 5.48 | 4.48 | 2.75 | 3.04 | 9.80 | 1.87 | 3.96 | 3.74 | 55.49 |
| 2015 | 3.08 | 3.32 | 2.29 | 2.67 | 1.08 | 6.32 | 3.79 | 8.65 | 8.66 | 0.20 | 3.92 | 0.56 | 44.54 |
| 2016 | 2.83 | 4.82 | 1.83 | 2.69 | 2.29 | 3.09 | 2.14 | 2.65 | 4.36 | 9.51 | 0.02 | 2.29 | 38.52 |
| 2017 | 4.05 | 0.81 | 1.07 | 0.74 | 8.65 | 11.88 | 10.91 | 9.09 | 13.33 | 4.01 | 2.61 | 2.42 | 70.31 |
| 2018 | 3.64 | 1.73 | 2.14 | 5.23 | 5.91 | 9.77 | 8.86 | 7.68 | 3.41 | 1.30 | 5.21 | 4.96 | 59.84 |
| 2019 | 4.37 | 1.83 | 2.04 | 2.58 | 1.74 | 4.41 | 5.29 | 9.87 | 2.35 | 3.30 | 3.69 | 4.86 | 46.33 |
| 2020 | 0.18 | 4.25 | 1.73 | 6.14 | 1.43 | 9.86 | 5.86 | 10.42 | 9.25 | 3.49 | 2.01 | 2.34 | 56.96 |
| 2021 | 1.97 | 6.63 | 2.82 | 5.14 | 0.48 | 9.71 | 8.87 | 7.48 | 5.11 | 4.15 | 3.19 | 1.61 | 57.16 |
| 2022 | 1.18 | 2.09 | 9.95 | 5.22 | 4.88 | 1.17 | 9.95 | 10.40 | 5.53 | 1.60 | 3.02 | 0.25 | 55.24 |
| 2023 | 2.18 | 1.42 | 3.33 | 3.05 | 5.68 | 7.63 | 7.93 | 4.98 | 9.00 | 2.65 | 3.95 | 6.81 | 58.61 |
| 2024 | 4.02 | 2.44 | 5.69 | 2.05 | 3.05 | 4.29 | 10.93 | 12.44 | 13.53 |
M = Monthly means or totals based on incomplete time series. 1 to 9 days are missing
X = Data not available
Last Updated on 09/12/23
By EP
