YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.12 | 81.40 | ----- | z | 68.48 | 57.03 | a | 49.73 | 40.40 | 62.36 | f | |||||
1924 | 39.00 | 44.84 | 47.39 | 54.13 | 65.92 | 80.31 | d | 80.80 | f | 79.81 | e | 72.90 | d | 61.43 | c | 47.25 | b | 40.85 | d | 57.62 | a | |||||
1925 | 37.96 | c | 48.08 | d | 54.14 | b | 60.00 | 69.68 | 77.12 | 80.85 | 75.08 | 69.62 | 57.69 | 44.87 | ----- | z | 61.37 | a | ||||||||
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | ----- | z | 45.12 | t | 52.54 | e | 61.38 | d | 74.91 | d | 85.92 | e | 78.33 | d | 77.57 | d | 73.24 | c | 62.87 | d | 46.22 | e | 41.04 | d | 65.40 | b |
1930 | 39.61 | d | 48.15 | d | 49.88 | e | 61.54 | d | 63.63 | d | 74.92 | e | 75.91 | d | 74.94 | e | 64.47 | 48.55 | u | 44.85 | c | 39.98 | e | 57.99 | a | |
1931 | 39.42 | e | 45.91 | e | 50.54 | f | 56.88 | d | 66.10 | f | 76.17 | d | 79.33 | e | 74.69 | e | 72.24 | e | 63.17 | d | 48.71 | d | 38.15 | e | 59.47 | b |
1932 | 36.42 | f | 45.90 | e | 48.02 | d | 55.87 | d | 64.23 | g | 71.81 | d | 76.26 | f | 75.33 | d | 68.98 | e | 57.37 | e | 46.86 | e | 37.54 | e | 56.41 | c |
1933 | 36.06 | f | 39.35 | e | 51.58 | e | 53.82 | e | 62.10 | e | 73.69 | d | 78.14 | f | 76.78 | d | 73.58 | e | 62.10 | e | 50.00 | e | 43.56 | f | 60.33 | c |
1934 | 38.35 | e | 48.02 | e | 55.39 | d | 61.64 | e | 71.17 | a | 75.29 | a | 79.00 | 76.74 | 70.80 | b | 62.15 | 48.92 | 43.37 | a | 60.90 | |||||
1935 | 43.25 | a | 44.38 | 51.11 | 59.37 | 63.00 | a | 75.52 | 80.27 | 76.06 | 68.97 | 61.94 | 48.38 | 41.56 | 59.48 | |||||||||||
1936 | 40.26 | 45.00 | a | 51.55 | 60.02 | 70.38 | f | 77.82 | 79.39 | 78.27 | 71.50 | 61.10 | 47.79 | a | 43.52 | a | 59.66 | a | ||||||||
1937 | 38.45 | 46.36 | 50.03 | 61.57 | a | 70.40 | 77.45 | 80.88 | a | 80.35 | 74.95 | 64.43 | a | 52.23 | 44.55 | 61.81 | ||||||||||
1938 | 44.15 | 48.77 | 54.02 | 59.66 | a | 69.27 | 78.33 | 77.81 | 78.69 | 71.40 | 65.94 | 46.76 | a | 44.58 | 61.61 | |||||||||||
1939 | 40.62 | a | 39.71 | 52.18 | 61.35 | 69.08 | 78.13 | 79.56 | 77.44 | 72.43 | 59.13 | 49.57 | 45.79 | 60.42 | ||||||||||||
1940 | 41.82 | 45.47 | 52.78 | a | 58.71 | d | 68.34 | 75.40 | 79.82 | 76.69 | 74.02 | 62.70 | a | 47.00 | 47.66 | 60.87 | ||||||||||
1941 | 43.77 | 50.12 | 51.16 | 55.57 | 68.13 | 75.02 | 79.29 | 76.73 | 71.72 | 60.84 | 50.85 | 44.82 | 60.67 | |||||||||||||
1942 | 44.24 | 44.48 | 50.10 | 59.80 | 67.29 | 76.85 | 81.44 | 77.06 | 72.72 | 68.45 | t | 54.58 | e | 46.19 | 61.34 | a | ||||||||||
1943 | 45.08 | 50.30 | 54.71 | 64.52 | 70.84 | 77.38 | 80.26 | 78.56 | 73.10 | 61.27 | 49.52 | 43.06 | 62.38 | |||||||||||||
1944 | 39.31 | 46.72 | 49.85 | 56.77 | 67.56 | 76.30 | 79.76 | 78.98 | 71.55 | 63.53 | 48.68 | 42.11 | 60.09 | |||||||||||||
1945 | 42.77 | 47.80 | 49.16 | 57.58 | 68.50 | 74.23 | 80.81 | ----- | z | 73.97 | a | 61.40 | 49.25 | 39.66 | 58.65 | a | ||||||||||
1946 | 38.33 | a | 45.10 | m | 52.23 | a | 63.25 | 68.16 | c | 78.20 | 78.47 | 76.53 | a | 69.15 | 63.55 | a | ----- | z | ----- | z | 65.32 | c | ||||
1947 | ----- | z | ----- | z | 52.50 | a | 57.98 | e | ----- | z | ----- | z | 80.62 | c | 78.83 | h | 74.72 | 62.21 | j | ----- | z | 39.44 | g | 66.46 | h | |
1948 | 40.98 | h | ----- | z | ----- | z | 63.21 | f | 71.69 | g | 79.29 | d | 81.78 | d | 79.21 | g | 74.88 | e | 64.36 | f | ----- | z | ----- | z | 78.65 | i |
1949 | 37.98 | h | 46.07 | f | 53.22 | f | 61.78 | e | 68.02 | f | 76.17 | d | 79.08 | f | 77.33 | d | 74.45 | i | 58.71 | j | 53.98 | j | 42.48 | j | 71.76 | i |
1950 | 44.19 | o | 49.11 | i | 54.11 | h | 63.08 | j | 67.43 | i | 77.57 | p | 77.45 | k | 75.65 | h | 72.22 | j | 68.48 | i | 54.05 | j | 46.12 | k | ----- | z |
1951 | 43.14 | i | 44.63 | i | 51.93 | j | 59.12 | n | 67.66 | i | 77.12 | v | 82.14 | i | 78.07 | i | 75.03 | l | 64.52 | h | 50.25 | j | 44.08 | l | ----- | z |
1952 | 46.41 | i | 42.79 | j | 47.25 | k | 59.66 | h | 70.38 | j | 77.74 | i | 79.56 | m | 79.00 | m | 73.88 | n | 63.12 | k | 46.22 | n | 39.38 | n | ----- | z |
1953 | 44.72 | m | 44.62 | k | 52.39 | m | 58.52 | j | 64.68 | l | 78.07 | g | 79.85 | k | 77.76 | n | 71.64 | l | 61.41 | i | 51.94 | n | 36.95 | l | ----- | z |
1954 | 45.58 | m | 49.89 | j | 52.50 | l | 63.39 | k | 69.58 | l | 75.58 | j | 79.48 | j | 74.07 | j | 73.67 | i | 65.50 | n | 52.28 | l | 43.31 | j | ----- | z |
1955 | 39.05 | l | 44.17 | m | 53.04 | h | 57.50 | a | 64.22 | d | 75.89 | c | 76.97 | b | 75.53 | 71.16 | b | 63.75 | a | 49.36 | e | 44.76 | 64.35 | c | ||
1956 | 45.03 | 40.30 | a | 52.23 | 56.30 | c | 67.62 | a | 78.22 | 76.93 | c | 74.34 | c | 72.40 | a | 61.41 | d | 45.04 | d | 41.34 | b | 59.26 | ||||
1957 | 46.98 | a | 53.81 | d | 53.69 | j | 59.73 | j | ----- | z | 82.69 | v | 78.74 | 74.19 | 68.61 | b | 58.15 | a | 44.88 | b | 40.75 | o | 60.77 | e | ||
1958 | 40.45 | a | 47.61 | a | 47.50 | 58.02 | b | 70.18 | a | 79.37 | 79.80 | i | 76.86 | b | 70.80 | c | 59.37 | 49.17 | f | ----- | z | 61.13 | c | |||
1959 | 44.69 | o | 45.50 | w | 50.38 | a | 61.04 | b | 67.33 | d | 74.54 | p | 78.83 | a | 74.57 | b | 70.20 | b | 60.84 | c | 47.70 | b | 42.66 | b | 61.50 | c |
1960 | 37.90 | a | 42.72 | d | 54.33 | a | 60.86 | a | 65.43 | a | 78.96 | f | 82.55 | k | ----- | z | 75.45 | k | 59.24 | j | 51.10 | i | 39.16 | i | 52.25 | g |
1961 | 42.23 | i | 45.39 | i | 53.31 | j | 62.64 | l | 71.02 | j | 78.77 | h | 80.03 | k | 76.37 | h | 70.68 | k | 59.90 | j | 46.10 | j | 43.20 | f | ----- | z |
1962 | 38.84 | 49.07 | 47.05 | 62.50 | 66.76 | 73.48 | 77.03 | 78.45 | 73.07 | 63.37 | 53.55 | 44.05 | 60.60 | |||||||||||||
1963 | 40.29 | 46.46 | 52.39 | 59.38 | 69.63 | 74.52 | 80.34 | 74.19 | 71.47 | 62.71 | 50.42 | 40.81 | 60.22 | |||||||||||||
1964 | 38.00 | 39.50 | 49.52 | 57.80 | 67.06 | 74.80 | 79.85 | 76.37 | 69.32 | 61.32 | 48.25 | 42.27 | 58.67 | |||||||||||||
1965 | 44.21 | 43.11 | 48.89 | 58.83 | 65.47 | 72.15 | 78.26 | 76.06 | 68.63 | 59.85 | 53.92 | 42.65 | 59.34 | |||||||||||||
1966 | 37.16 | 39.11 | 51.74 | 59.15 | 69.11 | 75.58 | 80.87 | 76.71 | 70.85 | 60.13 | 53.82 | 41.42 | 59.64 | |||||||||||||
1967 | 40.92 | 48.20 | 56.02 | 59.83 | 66.06 | 74.72 | 79.68 | 75.84 | 70.60 | 62.21 | 51.50 | 39.40 | 60.41 | |||||||||||||
1968 | 41.69 | 49.38 | 51.45 | 56.72 | 67.65 | 76.92 | 76.37 | 74.19 | 70.68 | 63.34 | 49.60 | 40.48 | 59.87 | |||||||||||||
1969 | 46.90 | 45.41 | 47.97 | 61.50 | 67.76 | b | 76.48 | i | 80.70 | d | 81.32 | c | 73.15 | g | 58.86 | i | 47.62 | d | 43.57 | a | 58.08 | c | ||||
1970 | 42.18 | c | 47.70 | m | 50.53 | b | 56.50 | c | 68.32 | i | 76.28 | c | 80.47 | 76.61 | 71.00 | c | 58.00 | o | 52.05 | j | 44.94 | d | 62.31 | d | ||
1971 | 43.23 | 43.86 | n | 54.65 | e | 56.69 | l | 66.26 | l | 75.58 | d | 81.38 | j | 75.85 | u | ----- | z | ----- | z | 46.56 | m | 41.96 | d | 53.85 | h | |
1972 | 42.56 | n | 47.48 | 58.14 | b | 61.48 | d | 67.19 | 76.28 | e | 79.95 | j | 74.43 | h | 72.05 | t | 62.52 | 45.12 | j | 42.98 | g | 62.18 | f | |||
1973 | 39.53 | b | 44.82 | f | 47.46 | c | 53.26 | i | 66.73 | g | 75.91 | b | 79.43 | d | 76.03 | a | 73.82 | k | 61.37 | 51.91 | b | 41.56 | d | 59.15 | d | |
1974 | 42.92 | 43.00 | 55.40 | 60.63 | 69.69 | g | 80.35 | 77.45 | 76.32 | i | 63.83 | r | 60.58 | 49.56 | c | 39.42 | a | 56.59 | c | |||||||
1975 | 42.10 | 44.73 | 50.76 | 54.58 | 62.41 | i | 74.52 | 77.19 | r | 77.84 | 68.53 | 60.29 | 48.90 | 42.81 | 56.51 | b | ||||||||||
1976 | 40.26 | 50.19 | 51.45 | 57.48 | c | ----- | z | 76.25 | j | 76.29 | 75.06 | 67.78 | 55.43 | a | 44.36 | i | 38.92 | 56.99 | c | |||||||
1977 | 40.37 | 45.50 | 46.68 | 58.65 | 64.81 | 75.53 | 78.37 | 78.32 | 73.00 | 62.61 | 50.28 | 45.45 | a | 59.96 | ||||||||||||
1978 | 44.18 | 44.29 | 53.81 | 59.53 | 67.06 | 77.23 | 80.18 | 76.08 | 70.62 | 61.56 | 51.82 | 38.34 | 60.39 | |||||||||||||
1979 | 39.73 | a | 45.88 | 49.40 | 59.07 | 65.40 | 74.35 | 79.44 | 74.33 | a | 71.73 | b | 64.66 | 45.33 | 42.31 | 59.30 | ||||||||||
1980 | 44.74 | 47.33 | 50.27 | 57.75 | 65.32 | 79.20 | 81.60 | 75.77 | 72.02 | 57.95 | a | 47.80 | 46.21 | 60.50 | ||||||||||||
1981 | 43.60 | 48.16 | 50.11 | 60.52 | 66.97 | 77.64 | a | 77.60 | 75.87 | 71.55 | 60.79 | 51.87 | 45.45 | 60.84 | ||||||||||||
1982 | 44.76 | 46.12 | b | 51.53 | a | 59.27 | 65.87 | 75.03 | 78.52 | 78.05 | 72.90 | a | 60.13 | a | 48.97 | 40.08 | 60.10 | |||||||||
1983 | 39.84 | b | 46.00 | 49.82 | 52.12 | 65.31 | 73.73 | 78.11 | 77.45 | 74.00 | 61.69 | 48.88 | 44.03 | 59.25 | ||||||||||||
1984 | 41.73 | 42.66 | 51.34 | 55.67 | 70.73 | 75.18 | 77.76 | 74.26 | 71.33 | 58.19 | 48.23 | 44.50 | 59.30 | |||||||||||||
1985 | 39.06 | 42.79 | 51.65 | 58.97 | 67.61 | 76.57 | 78.95 | 76.55 | 69.18 | 59.34 | 49.67 | 41.34 | 59.31 | |||||||||||||
1986 | 43.81 | 47.38 | 53.23 | 60.82 | 66.98 | 74.37 | 75.75 | i | 76.12 | f | 69.27 | 58.21 | 46.48 | 40.34 | 56.09 | b | ||||||||||
1987 | 39.89 | 44.25 | 48.35 | 58.03 | 64.60 | a | 75.33 | 77.95 | 75.24 | 69.22 | 64.90 | 48.00 | 39.67 | a | 58.79 | |||||||||||
1988 | 40.95 | 46.84 | 49.42 | 57.20 | 66.11 | 75.72 | 78.18 | 73.92 | 68.95 | 64.05 | 50.12 | 40.82 | 59.36 | |||||||||||||
1989 | 41.10 | 49.79 | 56.24 | 63.98 | 69.44 | 76.47 | 80.44 | 77.10 | 72.53 | 61.73 | 50.82 | 39.68 | 61.61 | |||||||||||||
1990 | 41.42 | 44.16 | 52.82 | 62.33 | 67.24 | 81.43 | 77.89 | 73.82 | 72.78 | 60.06 | 50.24 | a | 40.87 | 60.42 | ||||||||||||
1991 | 41.95 | 48.12 | 48.82 | 57.07 | 65.39 | 72.72 | 77.56 | 75.84 | 69.68 | 61.95 | 47.67 | a | 42.42 | 59.10 | ||||||||||||
1992 | 38.79 | 46.45 | 51.50 | 59.97 | 65.85 | 73.77 | 77.52 | 76.05 | 73.20 | 63.35 | 44.78 | 42.88 | a | 59.51 | ||||||||||||
1993 | 46.08 | 46.18 | 51.58 | 58.87 | 68.87 | 76.37 | 80.05 | 77.98 | 72.90 | a | 61.10 | 48.53 | 43.03 | 60.96 | ||||||||||||
1994 | 41.22 | a | 46.29 | 53.92 | a | 59.97 | 67.89 | 81.50 | 81.90 | 81.29 | 73.88 | 62.45 | 50.67 | 44.84 | 62.15 | |||||||||||
1995 | 43.53 | 50.89 | 51.76 | 55.86 | a | 65.10 | 74.68 | 79.89 | 80.47 | 73.88 | 63.52 | 53.88 | 44.40 | 61.49 | ||||||||||||
1996 | 44.61 | 51.09 | 52.35 | a | 61.08 | 72.35 | 78.70 | 80.69 | 76.92 | 70.22 | 61.77 | 50.80 | 43.31 | 61.99 | ||||||||||||
1997 | 41.98 | 45.93 | 53.79 | 57.70 | 71.05 | 75.73 | 79.69 | 78.74 | 76.35 | 60.56 | 50.52 | 38.92 | a | 60.91 | ||||||||||||
1998 | 43.74 | 44.05 | 50.00 | a | 54.00 | d | 67.77 | a | 75.70 | b | 79.67 | a | 78.97 | 76.29 | a | 63.07 | d | ----- | z | 45.08 | 61.67 | a | ||||
1999 | 46.44 | 49.80 | 55.67 | a | 57.93 | 69.47 | 75.31 | a | 77.19 | 78.88 | w | 74.61 | b | 64.65 | 56.58 | 43.35 | a | 61.00 | a | |||||||
2000 | 48.29 | 52.18 | a | 54.73 | 66.03 | 75.07 | a | 77.93 | b | 81.05 | a | 78.76 | b | 76.42 | 61.10 | a | 45.78 | 45.56 | 63.57 | |||||||
2001 | 41.39 | 47.52 | b | 53.74 | 60.70 | 72.98 | a | 80.40 | 79.55 | c | 77.00 | a | 75.18 | 66.93 | b | 54.60 | 42.18 | 62.68 | ||||||||
2002 | 44.78 | a | 46.74 | a | 53.52 | 66.38 | 70.94 | 80.72 | c | 80.45 | 79.07 | a | 73.62 | 60.77 | a | 52.27 | b | 42.31 | 62.63 | |||||||
2003 | 48.48 | c | 48.30 | 52.28 | a | 61.29 | a | 72.15 | 78.95 | 83.84 | 80.21 | 75.77 | 67.74 | 53.34 | a | 47.57 | q | 65.67 | a | |||||||
2004 | 45.48 | e | 45.12 | 57.98 | 59.73 | 71.02 | 78.37 | 80.08 | 76.48 | 71.77 | 63.50 | b | 49.31 | c | 43.16 | 61.83 | ||||||||||
2005 | 47.15 | 47.50 | a | 51.02 | a | 60.59 | a | 71.15 | 78.63 | 82.85 | 77.79 | 75.72 | 63.71 | 54.60 | 46.70 | a | 63.12 | |||||||||
2006 | 46.90 | a | 51.36 | 54.08 | 64.12 | 71.19 | b | 77.15 | f | 80.58 | a | 73.92 | e | 68.65 | 61.26 | 54.00 | 42.71 | 60.80 | a | |||||||
2007 | 39.19 | 42.09 | a | 54.05 | a | 60.82 | b | 70.92 | 80.17 | 77.73 | a | 76.70 | d | 74.52 | a | 64.53 | b | 55.97 | a | 42.58 | a | 61.61 | ||||
2008 | 44.08 | 49.37 | c | 54.37 | 60.72 | 68.75 | a | 79.83 | 77.13 | 75.36 | c | 70.70 | c | 62.87 | e | 52.34 | b | 45.57 | a | 61.76 | ||||||
2009 | 46.24 | 50.66 | 56.35 | 60.27 | d | 72.83 | a | 75.13 | d | 81.81 | b | 78.50 | d | 71.74 | e | 62.19 | d | 53.20 | b | 41.89 | 62.57 | |||||
2010 | 41.62 | e | 44.88 | b | 51.13 | 59.53 | a | 67.80 | a | 75.35 | 76.24 | f | 76.04 | f | 70.47 | j | 53.63 | h | 45.05 | b | 48.08 | 54.18 | d | |||
2011 | 42.65 | 45.10 | b | 57.93 | a | 64.57 | c | 67.76 | d | 81.78 | c | 81.90 | 80.12 | c | 74.91 | g | 63.71 | b | 50.57 | 40.52 | a | 61.51 | a | |||
2012 | 46.50 | 47.74 | b | 54.13 | 63.33 | a | 71.50 | b | 82.00 | 79.18 | 80.46 | c | 72.74 | a | 64.36 | i | 56.15 | 44.50 | e | 63.48 | a | |||||
2013 | 40.67 | g | 43.73 | h | 58.74 | n | 62.03 | l | 69.77 | p | 82.80 | g | 79.54 | q | 78.29 | l | 73.12 | e | 62.27 | k | 53.02 | e | 43.17 | g | 63.07 | j |
2014 | 46.53 | o | 53.08 | p | 56.06 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.27 | c | 50.62 | 45.76 | 53.21 | i | ||
2015 | 42.56 | 51.58 | b | 56.35 | 60.43 | 65.95 | b | 80.78 | 78.29 | 79.50 | 74.06 | d | 64.90 | a | 51.52 | 43.27 | a | 62.43 | ||||||||
2016 | 42.76 | 50.90 | 57.61 | 59.96 | d | 68.05 | 80.57 | b | 82.44 | 75.42 | a | 72.86 | b | 67.86 | b | 53.52 | b | 46.48 | a | 63.20 | ||||||
2017 | 44.90 | 50.71 | 59.73 | 63.67 | c | 67.18 | a | 81.16 | a | 79.19 | 76.52 | c | 73.88 | e | 65.35 | 59.85 | 46.24 | 64.03 | ||||||||
2018 | 47.15 | 50.45 | 55.55 | a | 66.55 | a | 72.82 | a | 81.22 | 79.03 | 79.48 | 74.85 | 60.60 | 50.32 | 44.52 | 63.54 | ||||||||||
2019 | 43.31 | 45.98 | 54.47 | 62.25 | 66.21 | 78.77 | 81.37 | 80.74 | 74.52 | 62.00 | 51.22 | 43.39 | 62.02 | |||||||||||||
2020 | 45.23 | 46.64 | 54.08 | 62.47 | 73.13 | 78.38 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.31 | g | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 42.43 | 46.63 | 52.29 | 59.67 | 68.27 | 77.05 | 79.45 | 77.03 | 71.98 | 61.93 | 50.09 | 42.77 | 60.93 | |||||||||||||
S.D. | 2.84 | 3.14 | 2.85 | 2.89 | 2.76 | 2.65 | 1.66 | 1.96 | 2.35 | 2.37 | 3.12 | 2.39 | 1.41 | |||||||||||||
SKEW | 0.16 | -0.33 | 0.24 | -0.01 | 0.31 | 0.61 | 0.08 | 0.34 | -0.33 | -0.07 | 0.43 | -0.03 | 0.35 | |||||||||||||
MAX | 48.48 | 53.81 | 59.73 | 66.55 | 75.07 | 85.92 | 83.84 | 81.32 | 76.42 | 67.86 | 59.85 | 48.08 | 64.03 | |||||||||||||
MIN | 37.16 | 39.11 | 46.68 | 52.12 | 62.10 | 71.81 | 75.91 | 73.82 | 64.47 | 55.43 | 44.78 | 37.54 | 58.67 | |||||||||||||
YRS | 77 | 76 | 81 | 82 | 73 | 79 | 75 | 75 | 78 | 76 | 77 | 76 | 50 |