YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1917 | ----- | z | ----- | z | ----- | z | ----- | z | 66.29 | 79.69 | a | 93.71 | 90.29 | 80.87 | 70.17 | b | 53.77 | 48.03 | b | 72.85 | d | |||||
1918 | 37.44 | d | 41.54 | 56.74 | 61.27 | 70.48 | b | 89.17 | a | 89.97 | 84.03 | 79.66 | a | 62.06 | 46.67 | 39.26 | 63.19 | |||||||||
1919 | 39.76 | f | 37.20 | h | 49.61 | 61.30 | 73.00 | c | 85.37 | 95.58 | 94.84 | 77.80 | 56.65 | 47.30 | 32.33 | a | 67.38 | b | ||||||||
1920 | 38.81 | 43.79 | a | 46.58 | 53.89 | b | 69.27 | a | 81.57 | 96.06 | 93.55 | b | 77.96 | e | 59.06 | 43.97 | 38.53 | a | 61.92 | |||||||
1921 | 38.35 | 40.85 | a | 55.32 | 55.23 | 71.19 | 84.20 | 93.74 | 92.77 | 74.63 | 72.58 | 54.70 | 41.81 | 64.62 | ||||||||||||
1922 | 26.16 | 35.50 | 39.31 | b | 53.33 | u | ----- | z | ----- | z | 92.47 | l | 86.39 | 81.80 | 69.23 | 44.37 | 36.65 | 52.42 | d | |||||||
1923 | 39.29 | 36.71 | 47.48 | 58.83 | 71.48 | 75.77 | 93.84 | 87.61 | 83.37 | 56.55 | 53.27 | 35.74 | 61.66 | |||||||||||||
1924 | 33.68 | 47.45 | 47.45 | 62.63 | 83.04 | h | 82.93 | b | 93.45 | 90.55 | 74.00 | k | 64.45 | 44.62 | i | 31.48 | 61.56 | c | ||||||||
1925 | 35.87 | 45.93 | 55.46 | r | 61.80 | 71.97 | 81.73 | 95.77 | 87.62 | g | ----- | z | ----- | z | 47.20 | 43.32 | 60.45 | d | ||||||||
1926 | 36.81 | 44.59 | a | 55.16 | 79.23 | 85.30 | a | 90.31 | a | 95.29 | 92.45 | 76.00 | 66.84 | 52.63 | 33.10 | b | 67.31 | |||||||||
1927 | 30.92 | g | 39.50 | 44.42 | 58.40 | 67.42 | 84.67 | 94.35 | 87.29 | 75.40 | 63.81 | 52.10 | a | 34.90 | 63.84 | a | ||||||||||
1928 | 36.37 | a | 41.59 | 54.03 | b | 57.17 | 79.45 | 80.10 | a | 93.90 | 91.97 | b | 82.21 | f | 62.52 | 48.76 | a | 34.45 | 61.85 | a | ||||||
1929 | 28.32 | 31.89 | 50.23 | 57.17 | 73.42 | 83.83 | 97.19 | 96.16 | 75.50 | 68.58 | 50.70 | 47.42 | 63.37 | |||||||||||||
1930 | 29.57 | a | 48.25 | 53.42 | 73.59 | a | 70.33 | a | 85.20 | 95.58 | 90.90 | 85.39 | l | ----- | z | 33.60 | y | 33.58 | 64.49 | c | ||||||
1931 | 37.13 | 41.39 | 52.13 | 65.27 | 78.19 | 89.00 | 96.94 | 95.16 | 79.90 | 70.13 | 48.53 | 35.06 | 65.74 | |||||||||||||
1932 | 32.10 | 34.97 | 45.06 | 61.50 | 71.77 | 82.90 | 93.97 | 90.81 | 84.33 | 64.90 | 55.03 | 31.00 | 62.36 | |||||||||||||
1933 | 35.80 | a | 28.79 | 47.10 | 60.77 | 66.60 | a | 89.45 | a | 97.50 | a | 93.29 | 80.37 | 76.20 | a | 55.37 | 47.71 | 64.91 | ||||||||
1934 | 43.84 | 52.89 | 62.48 | 72.53 | 82.52 | 83.03 | 97.40 | a | 94.48 | 77.79 | a | 71.58 | 54.03 | a | 39.70 | a | 69.36 | |||||||||
1935 | 37.32 | 40.04 | 49.83 | a | 59.77 | 67.97 | 82.97 | 97.16 | 96.42 | 87.50 | 67.77 | 42.60 | 40.19 | 64.13 | ||||||||||||
1936 | 32.90 | 34.45 | 48.71 | 67.53 | 81.23 | a | 87.55 | a | 97.23 | 90.97 | 80.03 | 69.90 | 53.63 | 40.10 | 65.35 | |||||||||||
1937 | 21.10 | 35.46 | 49.48 | 56.93 | 75.32 | 80.57 | 94.28 | b | 94.26 | 84.03 | 73.16 | 51.93 | 38.45 | 62.92 | ||||||||||||
1938 | 40.61 | 44.43 | 48.65 | 64.73 | 70.52 | 84.90 | 91.61 | 93.81 | 88.07 | 66.87 | 45.03 | 44.10 | 65.28 | |||||||||||||
1939 | 40.48 | 36.74 | a | 54.63 | a | 69.66 | a | 80.68 | 83.07 | 94.42 | 95.77 | a | 82.60 | 66.19 | 58.73 | 48.61 | 67.63 | |||||||||
1940 | 36.77 | 44.14 | 57.42 | 64.83 | a | 81.93 | a | 91.47 | 95.93 | a | 93.29 | 74.37 | 67.20 | a | 43.83 | 43.61 | 66.23 | |||||||||
1941 | 38.74 | 46.43 | 57.19 | 62.53 | 75.00 | 81.40 | 94.55 | 89.16 | 72.57 | 61.58 | 54.17 | 40.74 | 64.51 | |||||||||||||
1942 | 29.67 | a | 37.71 | 52.84 | 67.87 | 68.40 | a | 81.03 | 97.84 | 93.94 | 84.45 | a | 69.80 | a | 47.27 | 37.65 | 64.04 | |||||||||
1943 | 36.23 | 39.67 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 92.47 | a | 87.17 | 70.16 | 54.53 | 43.87 | 64.07 | f | |||||
1944 | 34.45 | 43.14 | 49.68 | 59.53 | 75.26 | 76.67 | 92.23 | a | 90.87 | a | 82.53 | 76.87 | a | 46.70 | 42.16 | 64.17 | ||||||||||
1945 | 40.00 | 44.39 | 51.84 | 59.53 | 72.00 | 77.70 | 95.16 | 93.06 | 77.34 | a | 75.16 | 46.30 | 38.48 | 64.25 | ||||||||||||
1946 | 38.03 | 43.36 | 54.94 | 69.33 | 73.32 | 84.50 | 94.65 | 93.71 | 81.17 | a | 57.00 | b | 47.40 | 47.23 | 65.39 | |||||||||||
1947 | 32.90 | 46.68 | 55.81 | 61.53 | 75.48 | 72.70 | c | 92.90 | 87.71 | 80.31 | a | 69.16 | 43.13 | 38.27 | a | 63.05 | ||||||||||
1948 | 39.84 | 41.28 | 46.30 | a | 61.90 | 72.00 | 79.37 | 85.97 | 87.65 | 77.70 | 66.32 | 44.03 | 30.77 | 61.09 | ||||||||||||
1949 | 17.77 | 36.36 | 49.26 | 68.57 | 73.26 | 79.03 | 88.13 | 86.97 | a | 80.33 | 59.29 | 58.93 | 38.68 | 61.38 | ||||||||||||
1950 | 33.10 | 41.61 | 47.32 | 59.55 | a | 66.52 | 76.07 | 84.68 | 86.35 | 74.97 | 69.32 | 50.60 | 42.74 | 61.07 | ||||||||||||
1951 | 34.29 | 44.43 | 47.06 | 64.03 | 70.26 | 75.13 | 89.29 | 83.94 | 79.07 | a | 60.74 | 47.93 | 32.35 | 60.71 | ||||||||||||
1952 | 31.23 | 34.38 | 41.13 | 66.60 | 72.19 | 78.50 | 87.65 | 88.45 | 81.90 | 74.03 | 43.83 | 40.71 | 61.72 | |||||||||||||
1953 | 47.35 | 46.96 | 54.35 | 58.20 | 64.48 | 74.60 | 87.00 | 85.55 | 79.40 | 66.45 | 54.47 | 38.94 | 63.15 | |||||||||||||
1954 | 41.03 | 50.00 | 47.97 | 63.57 | 75.55 | 75.69 | a | 91.16 | 85.58 | 79.63 | 64.58 | 56.47 | 36.23 | 63.95 | ||||||||||||
1955 | 30.48 | 35.25 | 44.00 | 58.00 | b | 68.45 | 79.40 | 85.94 | 89.87 | 76.97 | 67.84 | 44.47 | 40.00 | 60.06 | ||||||||||||
1956 | 38.45 | 32.07 | 51.81 | 63.83 | a | 71.29 | 80.73 | 89.45 | 84.32 | 80.47 | 60.87 | 46.40 | 40.32 | 61.67 | ||||||||||||
1957 | 31.00 | 42.71 | 52.13 | 58.90 | 68.65 | 78.40 | 89.06 | 88.94 | 80.47 | 62.29 | 43.17 | 41.93 | a | 61.47 | ||||||||||||
1958 | 35.94 | 49.64 | 49.77 | 58.60 | 79.55 | 79.37 | 86.52 | 89.71 | 78.70 | 71.42 | 49.50 | 45.58 | 64.52 | |||||||||||||
1959 | 40.19 | 43.68 | 52.40 | a | 65.60 | 63.65 | 83.41 | a | 90.39 | 85.06 | 71.23 | 63.71 | 53.10 | 40.94 | 62.78 | |||||||||||
1960 | 30.68 | 35.62 | 53.55 | 62.33 | 69.32 | 83.03 | 92.23 | 84.32 | 80.47 | 64.71 | 48.13 | 38.74 | 61.93 | |||||||||||||
1961 | 42.77 | 47.71 | 51.68 | 60.60 | 72.45 | 86.57 | 91.00 | 90.06 | 69.43 | 64.58 | 46.93 | 36.48 | 63.36 | |||||||||||||
1962 | 30.74 | 38.89 | 44.60 | a | 67.37 | 66.03 | 78.73 | 86.29 | 84.61 | 79.80 | 67.77 | 51.93 | 42.81 | 61.63 | ||||||||||||
1963 | 31.39 | 51.96 | 52.74 | 56.80 | 71.03 | 72.23 | 87.70 | a | 87.42 | 80.13 | 71.90 | 48.77 | 34.26 | 62.19 | ||||||||||||
1964 | 33.61 | 33.48 | 41.61 | 58.03 | 70.74 | 73.90 | 90.65 | 84.65 | 74.63 | 69.77 | 46.14 | a | 39.48 | 59.73 | ||||||||||||
1965 | 38.29 | 45.50 | 49.84 | 61.13 | 65.06 | 76.13 | 86.48 | 81.97 | a | 69.20 | 70.41 | b | 53.83 | 39.48 | 61.45 | |||||||||||
1966 | 38.19 | 39.71 | 54.10 | 62.10 | 76.58 | 79.40 | 90.55 | 86.90 | 80.43 | 64.26 | 51.27 | 36.29 | 63.32 | |||||||||||||
1967 | 41.00 | 48.46 | 53.55 | 56.00 | 69.87 | 75.17 | 90.58 | 92.29 | 82.30 | 66.81 | 50.17 | 32.81 | 63.25 | |||||||||||||
1968 | 39.52 | 46.66 | 57.58 | 59.20 | 69.06 | 79.69 | a | 91.77 | 79.10 | 75.47 | 64.87 | a | 44.73 | 36.94 | 62.05 | |||||||||||
1969 | 38.52 | 38.43 | 47.71 | 65.47 | 75.13 | 76.40 | 87.84 | 91.16 | 80.40 | 56.97 | 50.47 | 38.00 | 62.21 | |||||||||||||
1970 | 38.61 | 50.29 | 50.06 | 54.10 | 70.23 | 79.70 | 89.55 | 91.29 | 73.10 | 59.94 | 47.62 | a | 37.16 | 61.80 | ||||||||||||
1971 | 38.26 | 44.25 | 48.52 | 59.97 | 70.55 | 76.90 | 88.52 | 91.19 | 71.93 | 59.81 | 45.93 | 33.81 | 60.80 | |||||||||||||
1972 | 33.68 | 41.93 | 56.00 | 58.67 | 72.90 | 79.73 | 87.61 | 87.90 | 71.23 | 61.19 | 45.28 | a | 30.68 | 60.57 | ||||||||||||
1973 | 33.74 | 42.18 | 50.13 | a | 58.57 | b | 73.63 | a | 81.93 | 88.84 | 87.03 | 78.50 | 67.45 | 45.87 | 40.03 | 62.33 | ||||||||||
1974 | 31.48 | 43.75 | 51.61 | 62.37 | 68.13 | 85.73 | 89.42 | 86.45 | 80.83 | 68.73 | t | 50.58 | d | 37.39 | 62.52 | a | ||||||||||
1975 | 33.87 | 38.21 | 48.48 | 51.60 | 64.97 | 75.80 | 90.94 | ----- | z | 80.20 | 63.26 | 45.43 | 41.42 | 57.65 | a | |||||||||||
1976 | 36.68 | 39.86 | 45.61 | 59.83 | 75.74 | 79.30 | 90.23 | 82.68 | 80.00 | 65.26 | 53.86 | a | 42.87 | 62.66 | ||||||||||||
1977 | 32.03 | 47.86 | 48.00 | a | 67.03 | 62.03 | 84.00 | 86.19 | 85.32 | 75.23 | 67.80 | a | 47.83 | 40.45 | 61.98 | |||||||||||
1978 | 40.00 | 41.71 | 56.23 | 57.28 | a | 65.84 | 77.93 | 86.35 | 84.90 | 73.80 | 69.42 | 44.14 | a | 34.90 | 61.04 | |||||||||||
1979 | 24.84 | 39.21 | 51.61 | 60.10 | 71.42 | 81.80 | 89.84 | 87.37 | a | 83.93 | b | 67.90 | 44.27 | 41.39 | 61.97 | |||||||||||
1980 | 33.84 | 45.45 | 49.26 | 65.47 | 66.42 | 77.52 | a | 87.19 | 83.42 | 75.40 | 66.97 | 49.67 | 43.52 | 62.01 | ||||||||||||
1981 | 40.84 | 44.64 | 54.29 | 60.69 | d | 66.23 | 77.21 | a | 89.16 | 92.45 | 79.43 | 60.54 | c | 52.53 | 41.35 | 63.28 | ||||||||||
1982 | 31.41 | b | 36.42 | b | 48.77 | a | 57.10 | 68.03 | 79.03 | 84.93 | a | 83.14 | c | 71.93 | 60.60 | a | 44.72 | a | 35.68 | c | 58.48 | |||||
1983 | 39.90 | 44.00 | 51.19 | 55.63 | 67.84 | 76.40 | 84.65 | 89.48 | 75.60 | 64.97 | 46.40 | 32.00 | e | 60.67 | ||||||||||||
1984 | 28.00 | a | 32.54 | a | 48.26 | 56.93 | a | 68.03 | b | 74.33 | 87.45 | b | 89.10 | 75.57 | 58.19 | 45.31 | a | 30.93 | a | 57.89 | ||||||
1985 | 26.37 | a | 31.71 | 40.52 | 67.29 | b | 74.58 | 82.20 | 94.00 | 85.45 | ----- | z | 62.19 | 36.33 | 24.13 | 56.80 | a | |||||||||
1986 | 35.93 | a | 46.14 | 58.84 | 60.20 | 71.03 | 87.13 | 85.03 | 91.06 | 68.47 | 63.84 | 46.90 | a | 38.32 | 62.74 | |||||||||||
1987 | 32.39 | 44.86 | 51.60 | a | 71.73 | 73.68 | 84.70 | 86.26 | 87.06 | 81.93 | 70.60 | a | 49.70 | 38.61 | 64.43 | |||||||||||
1988 | 33.33 | a | 48.21 | 52.23 | 64.60 | 72.06 | 86.10 | 92.77 | 89.77 | 76.00 | 73.74 | 43.73 | 32.55 | 63.76 | ||||||||||||
1989 | 33.23 | 31.46 | 49.87 | 64.23 | 68.23 | 81.60 | 93.77 | 83.83 | b | 79.00 | 61.42 | 49.50 | 40.45 | 61.38 | ||||||||||||
1990 | 39.16 | 40.68 | 55.30 | a | 69.04 | b | 66.26 | 82.30 | 91.55 | 88.03 | 82.03 | 65.39 | 49.07 | a | 29.43 | a | 63.19 | |||||||||
1991 | 34.48 | 52.86 | 52.39 | 57.90 | 65.94 | 78.77 | 93.03 | 93.65 | 79.50 | 65.74 | 44.25 | b | 39.68 | 63.18 | ||||||||||||
1992 | 41.70 | a | 53.72 | 62.23 | 69.37 | 79.90 | 82.07 | a | 86.48 | 89.03 | 77.17 | 68.39 | 40.00 | a | 32.00 | 65.17 | ||||||||||
1993 | 27.04 | c | 30.65 | b | 46.71 | 57.13 | 76.62 | b | 72.93 | 78.23 | 82.23 | 76.87 | 64.37 | a | 45.18 | b | 38.10 | 58.00 | ||||||||
1994 | 41.90 | 40.88 | b | 58.06 | 62.27 | 73.90 | b | 82.30 | 90.87 | 91.19 | 81.43 | 61.29 | 37.52 | a | 34.03 | b | 62.97 | |||||||||
1995 | 39.06 | 50.70 | a | 50.70 | a | 59.97 | 64.42 | ----- | z | ----- | z | 88.16 | 78.27 | 61.68 | 53.00 | a | 41.20 | a | 58.72 | b | ||||||
1996 | 40.39 | c | 38.38 | 54.03 | a | 59.97 | 64.74 | 81.93 | 90.19 | 87.69 | r | 68.57 | p | 62.16 | 50.25 | b | 39.24 | b | 58.13 | b | ||||||
1997 | 38.32 | f | 41.32 | 54.45 | 57.97 | 74.57 | a | 76.07 | 84.84 | 88.67 | a | 78.37 | 62.00 | 49.63 | 35.87 | 63.98 | a | |||||||||
1998 | 43.21 | b | 44.28 | c | 50.65 | 58.10 | 65.53 | a | 72.30 | 91.94 | 90.68 | 79.53 | 62.65 | 49.31 | a | 36.37 | a | 62.04 | ||||||||
1999 | 39.83 | a | 42.65 | b | 51.39 | 55.00 | c | 65.81 | 78.23 | 87.29 | 88.79 | b | 77.40 | 67.29 | 58.76 | a | 37.03 | a | 62.46 | |||||||
2000 | 37.62 | b | 46.29 | a | 52.32 | 66.77 | 70.80 | a | 82.33 | 91.06 | 89.71 | 77.33 | 61.55 | 38.77 | 35.10 | a | 62.47 | |||||||||
2001 | 32.65 | 37.78 | a | 52.77 | 58.63 | 73.65 | 80.83 | a | 87.81 | 91.81 | 82.53 | 63.74 | 51.93 | 31.86 | b | 62.17 | ||||||||||
2002 | 32.07 | d | 32.54 | b | 45.93 | b | 61.07 | a | 69.29 | 80.70 | 92.43 | a | 83.71 | 76.63 | 60.28 | b | 48.53 | 41.50 | a | 60.39 | ||||||
2003 | 44.32 | 41.81 | a | 53.74 | 57.79 | a | 69.71 | 80.80 | 94.55 | 90.00 | 77.67 | 70.07 | b | 43.87 | 41.90 | a | 63.85 | |||||||||
2004 | 30.00 | c | 33.25 | a | 57.81 | 62.10 | 68.00 | a | 79.97 | 87.57 | a | 85.07 | a | 74.66 | a | 61.32 | 46.21 | a | 40.10 | 60.50 | ||||||
2005 | 34.03 | 40.71 | 53.53 | a | 58.90 | 67.73 | a | 75.07 | a | 92.23 | a | 88.06 | 78.04 | b | 66.06 | 47.10 | a | 33.27 | a | 61.23 | ||||||
2006 | 39.97 | b | 40.30 | a | 48.45 | 61.10 | a | 73.84 | 83.79 | a | 93.77 | a | 87.33 | a | 76.69 | a | 60.84 | 49.07 | b | 37.73 | a | 62.74 | ||||
2007 | 35.39 | c | 46.37 | a | 57.23 | 61.33 | 74.47 | a | 84.66 | a | 94.46 | c | 89.26 | 76.46 | b | 59.65 | 50.62 | a | 35.30 | d | 63.77 | |||||
2008 | 31.56 | d | 37.63 | b | 46.57 | a | 56.72 | a | 68.10 | a | 78.13 | 90.16 | 88.37 | a | 77.83 | 61.13 | a | 52.57 | b | 38.15 | d | 60.58 | ||||
2009 | 36.48 | b | 39.60 | c | 48.67 | a | 57.59 | a | 72.45 | 75.11 | b | 89.94 | 86.32 | c | 82.33 | c | 55.23 | 48.55 | a | 31.36 | c | 60.30 | ||||
2010 | 37.58 | 38.93 | 51.41 | d | 58.17 | a | 60.58 | 76.48 | c | 87.19 | 85.18 | c | 79.64 | b | 65.71 | 45.78 | c | 39.38 | b | 60.50 | ||||||
2011 | 34.87 | 40.26 | a | 48.61 | 53.11 | b | 62.52 | 75.03 | a | 88.58 | 90.74 | 82.20 | 63.67 | a | 45.43 | 37.63 | a | 60.22 | ||||||||
2012 | 41.26 | 41.93 | ----- | z | 64.93 | 70.30 | a | 80.10 | 91.35 | 90.42 | ----- | z | 63.16 | 51.90 | 38.27 | a | 63.36 | b | ||||||||
2013 | 25.52 | ----- | z | 53.74 | ----- | z | 71.00 | 83.30 | 92.71 | 91.29 | 74.83 | 60.10 | 50.60 | 32.97 | 63.61 | b | ||||||||||
2014 | 38.94 | 44.32 | 53.71 | 59.50 | 71.10 | 77.47 | 92.39 | 82.29 | 77.60 | 70.24 | f | 46.17 | 42.48 | 62.36 | a | |||||||||||
2015 | 36.61 | 51.11 | 60.83 | a | 60.83 | 69.13 | ----- | z | 85.16 | 87.10 | 79.03 | 69.19 | 41.57 | 33.42 | 61.27 | a | ||||||||||
2016 | 33.48 | 45.17 | 52.45 | 65.03 | 68.03 | 83.90 | 88.74 | 87.58 | 72.23 | 62.94 | 54.30 | 32.00 | 62.16 | |||||||||||||
2017 | ----- | z | ----- | z | 55.94 | 56.66 | a | 70.45 | 81.20 | 94.77 | ----- | z | 76.30 | 60.32 | 50.13 | 37.14 | j | 68.22 | d | |||||||
2018 | 42.61 | 42.14 | 49.23 | 60.83 | 72.84 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.53 | g | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 35.51 | 41.74 | 51.20 | 61.45 | 71.01 | 80.51 | 90.86 | 88.83 | 78.35 | 65.22 | 48.53 | 37.95 | 62.61 | |||||||||||||
S.D. | 5.12 | 5.56 | 4.46 | 4.77 | 4.69 | 4.22 | 3.80 | 3.67 | 3.88 | 4.68 | 4.48 | 4.56 | 2.02 | |||||||||||||
SKEW | -0.67 | -0.11 | -0.06 | 0.89 | 0.54 | 0.24 | -0.26 | -0.09 | -0.15 | 0.24 | -0.01 | -0.04 | 0.49 | |||||||||||||
MAX | 47.35 | 53.72 | 62.48 | 79.23 | 85.30 | 91.47 | 97.84 | 96.42 | 88.07 | 76.87 | 58.93 | 48.61 | 69.36 | |||||||||||||
MIN | 17.77 | 28.79 | 39.31 | 51.60 | 60.58 | 72.23 | 78.23 | 79.10 | 68.47 | 55.23 | 36.33 | 24.13 | 57.89 | |||||||||||||
YRS | 97 | 97 | 98 | 98 | 99 | 97 | 98 | 97 | 94 | 97 | 99 | 100 | 81 |