YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.00 | c | 73.42 | 61.21 | 50.42 | 46.32 | a | 62.47 | g | |||
1923 | 48.15 | 42.80 | 49.58 | 60.08 | 68.69 | 78.02 | 79.55 | 78.52 | 72.57 | 57.98 | 48.05 | 42.77 | 60.56 | |||||||||||||
1924 | 38.18 | 44.53 | 46.47 | 60.86 | i | 65.29 | 80.57 | 80.16 | 81.26 | 70.28 | a | 62.06 | 52.73 | 39.74 | 60.12 | a | ||||||||||
1925 | 38.15 | e | 51.98 | 57.90 | a | 65.48 | 69.13 | a | 80.75 | 82.70 | k | 78.54 | h | 77.87 | 65.02 | f | 50.30 | 41.40 | a | 59.22 | c | |||||
1926 | 41.38 | c | 50.94 | j | 50.85 | 57.48 | b | 70.98 | a | 76.62 | b | 77.34 | 74.48 | a | 72.07 | a | 63.38 | c | ----- | z | ----- | z | 64.95 | c | ||
1927 | ----- | z | ----- | z | 50.30 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | 71.45 | l | 77.33 | 79.58 | 74.70 | c | 68.98 | 64.47 | 48.32 | e | 43.25 | c | 65.23 | e | ||||
1929 | 41.75 | a | 39.43 | a | 51.90 | b | 61.70 | c | 67.81 | d | 76.33 | 77.82 | a | ----- | z | 72.43 | a | ----- | z | ----- | z | ----- | z | 61.15 | d | |
1930 | ----- | z | ----- | z | 49.87 | l | 64.47 | 67.27 | 74.86 | a | 78.66 | 78.41 | b | 75.05 | 61.40 | 48.32 | 40.18 | 65.40 | c | |||||||
1931 | 41.98 | 47.04 | 48.60 | 57.50 | 65.39 | 77.07 | 78.81 | 76.82 | 76.83 | 65.47 | 53.08 | 38.77 | 60.61 | |||||||||||||
1932 | 37.97 | 48.34 | 47.31 | 61.92 | 66.47 | 75.33 | 78.16 | 77.45 | 66.80 | 58.47 | 48.18 | 36.71 | 58.59 | |||||||||||||
1933 | 44.03 | 40.77 | 53.68 | 58.05 | 67.58 | 76.62 | 80.02 | 77.40 | 74.80 | 64.45 | 52.32 | 48.60 | 61.53 | |||||||||||||
1934 | 41.68 | 46.07 | 51.92 | 61.91 | a | 71.10 | 79.20 | 81.48 | 79.97 | 72.15 | 66.02 | 53.43 | 44.92 | 62.49 | ||||||||||||
1935 | 47.15 | a | 46.12 | 55.44 | f | 64.23 | 66.53 | 75.63 | 78.45 | 79.84 | 68.10 | 64.37 | 51.10 | 43.02 | 62.23 | a | ||||||||||
1936 | 42.24 | 45.34 | 56.10 | 61.77 | 70.03 | 78.90 | 80.45 | 80.81 | 71.72 | 59.32 | 48.77 | 45.47 | 61.74 | |||||||||||||
1937 | 38.11 | 45.55 | 47.97 | 62.03 | 71.05 | 77.93 | 81.58 | 80.45 | 72.87 | 61.80 | h | 49.30 | y | 44.13 | 62.17 | b | ||||||||||
1938 | 44.52 | 50.09 | 57.27 | a | 61.30 | 71.29 | 77.92 | 79.27 | 79.76 | 74.55 | 64.98 | 48.45 | 44.48 | 62.82 | ||||||||||||
1939 | 45.65 | a | 41.55 | 55.24 | 62.53 | 73.48 | c | 81.32 | 81.19 | 78.44 | 75.38 | 64.29 | 49.08 | 47.53 | 62.97 | |||||||||||
1940 | 37.34 | 45.98 | 55.31 | 62.15 | 70.34 | c | 74.70 | g | 80.48 | b | 77.52 | a | 73.98 | 63.97 | 50.17 | 46.52 | c | 60.34 | a | |||||||
1941 | 45.44 | 47.61 | 49.40 | 59.27 | 68.42 | 72.60 | 77.81 | 78.31 | 72.07 | 64.29 | 52.60 | 45.03 | 61.07 | |||||||||||||
1942 | 41.27 | 45.41 | 49.53 | n | 59.90 | a | 68.00 | 76.50 | c | 78.72 | a | 75.92 | 69.62 | b | 61.88 | c | 54.89 | c | 46.23 | 61.67 | a | |||||
1943 | 42.38 | c | 51.08 | b | 52.82 | 66.22 | c | 69.00 | 78.50 | 80.58 | 83.23 | c | 73.12 | e | 61.23 | 49.32 | 41.48 | 62.41 | ||||||||
1944 | 42.13 | a | 49.25 | a | 54.20 | c | 61.21 | b | 69.32 | 79.67 | a | 79.18 | t | 80.09 | b | 69.30 | t | 62.07 | i | 52.62 | d | 41.55 | 58.89 | c | ||
1945 | 45.03 | 49.96 | e | 57.09 | h | 59.54 | d | 72.52 | b | 79.23 | ----- | z | 76.11 | v | 73.69 | i | 61.57 | a | 55.75 | p | 40.95 | k | 61.31 | f | ||
1946 | 39.56 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.56 | k |
1947 | ----- | z | ----- | z | 53.65 | e | 65.03 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.65 | k |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | 71.65 | 81.12 | a | 80.03 | 78.05 | i | 72.98 | 62.66 | 49.33 | 48.63 | 66.63 | e | ||||||
1949 | 35.50 | a | 47.46 | 55.16 | 58.65 | 69.73 | 75.79 | a | 79.35 | a | 77.65 | 71.29 | b | 58.97 | b | 55.40 | 44.47 | 60.78 | ||||||||
1950 | 47.34 | 50.98 | 53.87 | 61.82 | 69.74 | 76.35 | 76.90 | 76.26 | 71.23 | 66.81 | 52.12 | 45.18 | 62.38 | |||||||||||||
1951 | 40.95 | 47.79 | 52.62 | a | 60.70 | 70.84 | 79.37 | 81.47 | 79.97 | 73.68 | 64.26 | 48.27 | 45.03 | 62.08 | ||||||||||||
1952 | 48.00 | 48.24 | 51.03 | a | 59.38 | 69.50 | 79.57 | 77.31 | 82.11 | 70.78 | a | 60.84 | 47.45 | 43.24 | d | 61.45 | ||||||||||
1953 | 50.08 | a | 43.77 | 57.68 | 61.81 | f | 68.73 | 82.30 | h | 82.10 | 79.73 | 73.92 | 62.08 | 50.33 | 39.29 | 60.77 | b | |||||||||
1954 | 44.27 | 51.30 | a | 50.39 | 65.43 | 64.98 | 74.40 | j | 79.74 | 77.42 | a | 73.43 | 62.58 | 50.53 | 43.24 | 60.30 | a | |||||||||
1955 | 39.21 | 41.95 | 52.65 | 61.00 | 69.15 | 75.04 | c | 76.95 | 76.13 | 72.33 | a | 62.53 | 50.50 | 47.27 | 60.39 | |||||||||||
1956 | 43.97 | 43.02 | 54.58 | 60.77 | 72.73 | 80.45 | 80.60 | 78.00 | 73.10 | 63.47 | 47.82 | 47.11 | 62.13 | |||||||||||||
1957 | 44.10 | b | 52.86 | 54.60 | a | 60.75 | 68.05 | 77.28 | 82.68 | 80.26 | 72.13 | 60.35 | 46.22 | 47.68 | 62.25 | |||||||||||
1958 | 40.73 | 45.18 | 46.00 | 58.18 | 71.10 | 81.18 | 82.73 | 80.44 | 73.45 | 61.00 | 52.55 | 43.97 | 61.37 | |||||||||||||
1959 | 41.81 | 44.61 | a | 52.52 | 59.98 | 71.52 | 78.65 | 78.74 | 80.55 | 74.58 | 61.27 | 46.55 | 44.63 | 61.28 | ||||||||||||
1960 | 40.60 | 40.90 | 50.77 | 65.22 | 71.63 | 82.58 | 79.58 | 79.85 | 75.63 | 65.73 | 54.08 | 39.77 | 62.20 | |||||||||||||
1961 | 40.56 | 47.77 | 54.53 | 63.17 | 72.10 | 77.43 | 77.35 | 78.13 | 73.72 | 65.00 | 47.85 | 44.11 | 61.81 | |||||||||||||
1962 | 38.27 | 52.80 | 50.89 | 63.60 | 75.02 | 77.23 | 80.23 | 80.47 | 72.52 | 65.71 | 54.13 | 45.82 | 63.06 | |||||||||||||
1963 | 39.08 | 48.61 | 56.44 | 67.72 | 73.15 | 77.42 | 80.47 | 79.44 | 74.27 | 67.03 | 52.42 | 38.98 | 62.92 | |||||||||||||
1964 | 41.21 | 39.72 | 51.31 | 62.55 | 72.48 | 78.73 | 81.95 | 81.08 | 71.07 | 62.13 | 51.18 | 42.42 | 61.32 | |||||||||||||
1965 | 44.81 | 40.27 | 45.24 | 63.93 | 70.40 | 77.18 | 80.87 | 77.18 | 72.72 | 61.97 | 56.28 | 45.74 | 61.38 | |||||||||||||
1966 | 35.06 | 39.34 | 53.55 | 58.92 | 67.90 | 76.32 | 82.19 | 76.42 | 71.78 | 58.90 | 54.43 | 39.61 | 59.54 | |||||||||||||
1967 | 41.58 | 44.77 | 57.94 | 66.27 | 68.60 | 77.50 | 78.58 | 76.56 | 69.42 | 61.95 | 51.43 | 39.29 | 61.16 | |||||||||||||
1968 | 41.11 | 42.02 | 50.34 | 58.45 | 67.65 | 75.68 | 76.60 | 76.52 | 69.13 | 63.48 | 48.53 | 42.06 | 59.30 | |||||||||||||
1969 | 44.98 | 45.71 | 42.94 | 62.07 | 68.47 | 76.30 | 81.98 | 80.23 | 71.75 | 58.13 | 48.93 | 45.31 | 60.57 | |||||||||||||
1970 | 39.16 | 45.04 | 46.52 | 59.55 | 67.87 | 74.73 | 79.73 | 79.00 | 72.17 | 56.56 | 48.85 | 47.24 | 59.70 | |||||||||||||
1971 | 42.82 | 42.96 | 51.08 | 59.93 | 68.39 | 78.22 | 79.56 | 73.10 | 71.00 | 62.13 | 52.47 | 44.66 | 60.53 | |||||||||||||
1972 | 42.42 | 46.21 | 57.76 | 65.52 | 68.95 | 78.52 | 78.42 | 76.48 | 72.87 | 61.90 | 44.52 | 40.31 | 61.16 | |||||||||||||
1973 | 36.35 | 40.82 | 51.18 | 55.47 | 67.06 | 76.03 | 78.58 | 77.97 | 72.23 | 65.00 | 54.40 | 43.55 | 59.89 | |||||||||||||
1974 | 41.42 | 44.61 | 59.18 | 63.62 | 73.29 | 77.40 | 80.82 | 75.69 | 64.70 | 61.23 | 48.93 | 41.06 | 61.00 | |||||||||||||
1975 | 41.98 | 43.11 | 49.34 | 58.08 | 66.63 | 76.73 | 75.42 | 76.16 | 67.33 | 62.10 | 50.67 | 43.11 | 59.22 | |||||||||||||
1976 | 40.85 | 51.60 | 52.80 | a | 62.27 | 65.27 | 76.50 | 75.21 | 77.73 | 70.83 | 55.13 | 43.22 | 41.15 | 59.38 | ||||||||||||
1977 | 35.24 | 46.77 | 51.03 | 59.98 | 72.02 | 79.30 | 80.97 | 81.98 | 78.08 | 63.74 | 51.97 | 44.98 | 62.17 | |||||||||||||
1978 | 36.08 | 38.34 | 52.42 | 66.45 | 70.40 | 78.82 | 82.15 | 79.44 | 71.75 | 62.18 | 50.80 | 39.87 | 60.72 | |||||||||||||
1979 | 33.94 | 43.00 | 51.34 | 62.37 | 67.52 | 74.22 | 80.68 | 76.77 | 72.87 | 65.16 | 46.15 | 43.67 | a | 59.81 | ||||||||||||
1980 | 42.27 | a | 44.69 | 50.47 | 58.72 | 68.92 | 82.07 | 84.26 | 80.11 | 73.27 | 59.65 | 46.67 | 45.77 | 61.40 | ||||||||||||
1981 | 41.92 | 45.91 | 51.06 | 63.50 | 68.56 | 77.52 | 80.65 | 75.82 | 71.40 | 61.19 | 53.57 | 45.74 | 61.40 | |||||||||||||
1982 | 40.92 | a | 42.45 | 54.00 | 59.97 | 68.23 | 76.20 | 81.11 | 81.07 | a | 74.35 | c | 61.05 | 49.37 | 40.39 | 60.76 | ||||||||||
1983 | 38.68 | 45.02 | 53.18 | 56.53 | 68.68 | a | 75.83 | 81.45 | 81.16 | 75.03 | 63.97 | 51.20 | b | 32.40 | b | 60.26 | ||||||||||
1984 | 37.85 | 46.33 | 51.65 | 60.50 | 71.34 | 77.08 | 79.42 | a | 77.90 | 70.17 | 58.85 | 50.22 | 45.16 | 60.54 | ||||||||||||
1985 | 37.58 | 41.55 | 54.50 | 64.33 | 71.34 | 75.03 | a | 79.34 | 81.16 | 71.90 | 60.45 | 52.42 | 39.45 | 60.76 | ||||||||||||
1986 | 44.45 | 48.46 | 55.95 | 65.93 | 71.03 | a | 74.27 | 79.23 | 78.29 | 72.00 | 60.82 | 48.68 | 41.23 | 61.70 | ||||||||||||
1987 | 40.68 | 45.84 | 48.48 | a | 58.08 | 68.65 | 74.98 | 78.94 | 79.57 | a | 70.65 | 63.82 | a | 50.82 | 41.77 | 60.19 | ||||||||||
1988 | 37.44 | 43.78 | 52.27 | 59.90 | a | 68.77 | 76.90 | 77.08 | 77.42 | 71.23 | 63.02 | 53.77 | 41.66 | 60.27 | ||||||||||||
1989 | 44.26 | 42.39 | 54.21 | 63.95 | 73.05 | 76.08 | 80.55 | 77.85 | 69.38 | 64.24 | 51.63 | 36.47 | 61.17 | |||||||||||||
1990 | 43.87 | 48.00 | 51.29 | 61.57 | 68.69 | 83.95 | 76.71 | 76.11 | 73.17 | 61.03 | 53.90 | 40.15 | 61.54 | |||||||||||||
1991 | 38.77 | 48.11 | 54.24 | 62.75 | 73.52 | 77.88 | 77.47 | 76.47 | 67.50 | 62.76 | 44.97 | 42.44 | 60.57 | |||||||||||||
1992 | 39.53 | 48.62 | 55.42 | 61.38 | 66.47 | 74.90 | 79.29 | 75.55 | 73.28 | 63.89 | 47.60 | 43.08 | 60.75 | |||||||||||||
1993 | 40.45 | 42.50 | 51.05 | 59.85 | 67.81 | 77.67 | 81.16 | 79.45 | 70.37 | 60.19 | 45.77 | 43.77 | 60.00 | |||||||||||||
1994 | 41.23 | 42.79 | 53.11 | 60.17 | 68.47 | 82.08 | 81.77 | 79.23 | 72.03 | 63.25 | a | 52.05 | 46.84 | 61.92 | ||||||||||||
1995 | 42.37 | 49.57 | 51.02 | 59.48 | a | 68.94 | 76.17 | 81.15 | 78.94 | 70.75 | 61.37 | a | 51.72 | 43.56 | 61.25 | |||||||||||
1996 | 41.77 | 47.41 | 49.32 | a | 60.45 | 77.32 | 79.28 | 80.11 | 77.56 | 70.02 | 61.82 | a | 51.57 | 44.77 | 61.78 | |||||||||||
1997 | 39.26 | 42.64 | 54.82 | 55.78 | 68.26 | 75.37 | 80.58 | 79.15 | 75.12 | 62.08 | 47.90 | 39.23 | 60.02 | |||||||||||||
1998 | 45.37 | 46.00 | 50.06 | 58.63 | 75.42 | 82.87 | 84.53 | 78.73 | 76.92 | 65.55 | 53.30 | 43.58 | 63.41 | |||||||||||||
1999 | 46.11 | 51.34 | 52.68 | 61.40 | 68.61 | 76.57 | 80.82 | 80.95 | 71.08 | 61.89 | 55.73 | 42.76 | 62.50 | |||||||||||||
2000 | 45.11 | 52.34 | 54.97 | 63.15 | 75.02 | a | 76.55 | 82.56 | 81.02 | 75.32 | 62.11 | 43.63 | 38.39 | 62.51 | ||||||||||||
2001 | 38.84 | 46.12 | 48.77 | 63.53 | 72.27 | 81.00 | 83.84 | 80.44 | 73.08 | 62.50 | 52.38 | 43.89 | 62.22 | |||||||||||||
2002 | 43.81 | 42.25 | 48.98 | 64.10 | 70.73 | 79.67 | 79.47 | 81.56 | 73.22 | 60.68 | 47.52 | 42.34 | 61.19 | |||||||||||||
2003 | 43.27 | 43.73 | 53.61 | 63.47 | 71.84 | 75.77 | 79.87 | 81.19 | 71.38 | 65.48 | 51.75 | 44.06 | 62.12 | |||||||||||||
2004 | 42.82 | 42.45 | 56.23 | 59.80 | 71.55 | 78.67 | 79.52 | 76.74 | 70.82 | 63.21 | 48.45 | 41.85 | 61.01 | |||||||||||||
2005 | 45.79 | 45.54 | 51.10 | 60.53 | 68.13 | a | 78.62 | 79.89 | 77.58 | 75.83 | 61.60 | 51.80 | 42.10 | 61.54 | ||||||||||||
2006 | 46.87 | 46.00 | 54.44 | 65.18 | 74.10 | 79.83 | 80.77 | 78.68 | 68.70 | 61.79 | 52.38 | 41.15 | 62.49 | |||||||||||||
2007 | 36.31 | 43.79 | 55.60 | a | 56.53 | 65.50 | 74.17 | 76.55 | 78.97 | 73.92 | 65.29 | 50.80 | 43.68 | 60.09 | ||||||||||||
2008 | 40.02 | 47.36 | 52.02 | 60.07 | 69.73 | 81.23 | 78.63 | 77.53 | 68.72 | a | 61.13 | 50.40 | 41.02 | 60.65 | ||||||||||||
2009 | 42.61 | 49.57 | 54.44 | 60.70 | 69.71 | 78.30 | 79.29 | 79.97 | 69.83 | 59.95 | 52.83 | 38.24 | d | 61.29 | ||||||||||||
2010 | 39.78 | a | 40.61 | 51.15 | a | 61.04 | d | 68.05 | 81.38 | 76.40 | 80.45 | 74.47 | 63.68 | 49.98 | 44.73 | 60.98 | ||||||||||
2011 | 40.19 | 42.52 | 57.68 | 66.43 | 70.24 | 84.48 | 84.26 | 84.61 | 72.93 | 64.16 | 50.93 | 38.42 | a | 63.07 | ||||||||||||
2012 | 45.18 | a | 46.03 | 58.33 | b | 65.90 | e | 74.94 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.86 | h | |
2013 | ----- | z | 44.64 | 52.31 | 58.83 | 69.66 | 80.38 | 77.39 | 80.00 | 73.70 | 61.21 | 47.50 | 38.83 | a | 62.22 | a | ||||||||||
2014 | 39.44 | 44.70 | 50.61 | 60.58 | 68.25 | a | 78.70 | b | 79.10 | b | 80.03 | 70.17 | 64.34 | 45.92 | 45.17 | a | 60.58 | |||||||||
2015 | 37.71 | 44.12 | 51.10 | 60.45 | 65.60 | a | 75.66 | a | 81.39 | 80.83 | d | 77.20 | c | 63.32 | a | 50.07 | 44.47 | b | 60.99 | |||||||
2016 | 43.63 | d | 46.83 | 54.22 | b | 60.30 | 67.40 | 76.85 | 82.77 | 76.02 | 68.82 | b | 64.47 | 53.86 | a | 42.73 | 61.49 | |||||||||
2017 | 44.32 | a | 52.52 | b | 59.05 | 62.60 | 67.45 | a | 77.37 | 79.02 | a | 76.18 | 73.60 | 61.92 | 54.92 | 42.74 | 62.64 | |||||||||
2018 | 38.89 | 45.66 | 57.06 | 60.92 | 77.55 | 82.65 | 81.90 | 79.74 | 71.25 | 60.74 | 46.50 | 42.58 | 62.12 | |||||||||||||
2019 | 42.26 | 46.24 | a | 49.45 | b | 62.42 | 68.45 | a | 75.53 | a | 79.30 | c | 83.45 | b | 76.84 | a | 59.47 | a | 48.35 | 46.11 | 61.49 | |||||
2020 | 44.82 | a | 42.69 | 56.45 | b | 60.97 | 73.26 | 78.93 | b | 84.79 | 83.35 | 70.72 | 61.26 | 55.63 | 42.81 | 62.97 | ||||||||||
2021 | 40.74 | 37.86 | 53.69 | 58.78 | 69.58 | a | 79.38 | 77.97 | a | 78.48 | 75.72 | a | 65.72 | a | 53.65 | 52.98 | 62.05 | |||||||||
2022 | 39.92 | 40.31 | a | 51.60 | a | 65.33 | a | 75.81 | 80.81 | q | 85.90 | e | 81.73 | 75.65 | 63.82 | 48.05 | 44.20 | a | 61.12 | a | ||||||
2023 | 45.12 | c | 43.73 | 56.26 | 60.55 | a | 72.47 | 80.47 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.77 | f | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 41.58 | 45.44 | 52.64 | 61.44 | 69.86 | 77.97 | 79.96 | 78.86 | 72.37 | 62.38 | 50.44 | 43.01 | 61.28 | |||||||||||||
S.D. | 3.24 | 3.51 | 3.22 | 2.64 | 2.66 | 2.39 | 2.10 | 2.18 | 2.50 | 2.25 | 2.88 | 3.09 | 1.04 | |||||||||||||
SKEW | 0.04 | 0.19 | -0.26 | 0.19 | 0.61 | 0.49 | 0.26 | 0.01 | -0.17 | -0.42 | -0.21 | -0.21 | -0.17 | |||||||||||||
MAX | 50.08 | 52.86 | 59.18 | 67.72 | 77.55 | 84.48 | 85.90 | 84.61 | 78.08 | 67.03 | 56.28 | 52.98 | 63.41 | |||||||||||||
MIN | 33.94 | 37.86 | 42.94 | 55.47 | 64.98 | 72.60 | 75.21 | 73.10 | 64.70 | 55.13 | 43.22 | 32.40 | 58.59 | |||||||||||||
YRS | 95 | 94 | 93 | 94 | 96 | 93 | 93 | 93 | 95 | 93 | 93 | 94 | 79 |