YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 79.25 | a | 76.86 | c | 70.53 | 55.35 | 35.34 | a | 28.97 | 57.72 | f | |||
1936 | 34.47 | b | 29.60 | x | 42.79 | e | 55.20 | 67.09 | b | 72.98 | 82.86 | c | 79.55 | b | 65.71 | b | 57.62 | a | 39.05 | a | 35.44 | 57.52 | a | |||
1937 | 15.92 | a | 32.61 | a | 46.35 | a | 49.75 | 63.95 | 69.05 | 82.44 | 76.60 | a | 69.19 | a | 57.88 | a | 46.98 | 39.03 | a | 54.15 | ||||||
1938 | 37.32 | c | 42.68 | c | 43.60 | b | 53.43 | a | 59.30 | d | 70.25 | b | 79.22 | b | 76.52 | a | 72.31 | a | 55.82 | a | 37.18 | b | 35.53 | a | 55.26 | |
1939 | 35.47 | 34.11 | 46.39 | 56.68 | 64.95 | 66.95 | 80.42 | 79.76 | 67.65 | 55.32 | 43.40 | 38.92 | a | 55.83 | ||||||||||||
1940 | 34.44 | 40.98 | a | 48.37 | 53.45 | 65.58 | 76.12 | 81.37 | a | 80.05 | 67.20 | 56.79 | 38.60 | 36.76 | 56.64 | |||||||||||
1941 | 35.23 | 41.43 | a | 48.38 | a | 52.95 | 62.47 | 67.33 | 80.75 | a | 75.60 | 61.59 | c | 53.96 | c | 43.15 | f | 38.08 | a | 56.16 | a | |||||
1942 | 24.02 | 34.21 | b | 42.21 | b | 55.25 | 56.92 | 64.87 | 81.17 | a | 77.68 | 68.12 | b | 56.94 | 42.50 | 36.11 | 53.33 | |||||||||
1943 | 33.23 | 38.23 | 42.42 | 57.65 | 58.86 | b | 64.60 | 76.73 | a | 75.62 | a | 70.17 | 56.40 | 41.83 | 33.92 | 54.14 | ||||||||||
1944 | 26.90 | a | 37.24 | 41.67 | b | 51.16 | a | 62.73 | 63.36 | a | 76.53 | a | 75.60 | 67.12 | 59.89 | 40.53 | 31.02 | a | 52.81 | |||||||
1945 | 34.46 | e | 39.31 | a | 42.38 | c | 49.03 | 60.15 | a | 65.31 | a | 79.83 | a | 77.60 | a | 63.47 | 58.45 | 43.37 | 34.18 | 53.96 | ||||||
1946 | 34.47 | a | 37.00 | 46.86 | b | 56.70 | c | 63.09 | d | 70.48 | a | 80.34 | 77.34 | 64.20 | 49.23 | 40.53 | 39.40 | 54.97 | ||||||||
1947 | 26.68 | a | 40.37 | b | 48.55 | a | 54.03 | 66.60 | 65.62 | 80.98 | 76.58 | 66.13 | 57.24 | b | 40.71 | b | 35.34 | 54.90 | ||||||||
1948 | 35.31 | 36.04 | a | 41.73 | a | 51.50 | 60.93 | c | 71.57 | a | 76.32 | a | 75.06 | 65.88 | 56.21 | 40.78 | 29.21 | b | 53.38 | |||||||
1949 | 14.47 | 34.02 | 46.39 | c | 58.02 | a | 65.55 | b | 70.55 | 80.06 | 78.26 | 69.97 | 50.52 | 47.23 | 35.37 | 54.20 | ||||||||||
1950 | 28.63 | 38.80 | 43.94 | 52.87 | 59.97 | a | 68.93 | 79.39 | 77.82 | 67.95 | 59.92 | 45.30 | 38.72 | a | 55.19 | |||||||||||
1951 | 33.08 | 39.67 | a | 42.08 | 56.41 | a | 61.97 | 68.58 | 81.52 | 76.97 | 68.45 | 53.85 | 41.93 | 32.44 | 54.75 | |||||||||||
1952 | 27.89 | 33.28 | 40.58 | 57.35 | 63.27 | 69.65 | 79.40 | 79.47 | 70.53 | 60.82 | 38.53 | 36.68 | 54.79 | |||||||||||||
1953 | 44.69 | 41.75 | 48.06 | 52.28 | a | 57.87 | 65.58 | 81.66 | 77.95 | b | 71.35 | 58.52 | 49.19 | a | 34.23 | a | 56.93 | |||||||||
1954 | 39.87 | 43.25 | 44.13 | 56.42 | 66.19 | 66.37 | 81.27 | a | 73.92 | 67.86 | b | 55.34 | 46.61 | b | 33.50 | 56.23 | ||||||||||
1955 | 28.35 | 32.79 | 41.45 | 49.71 | b | 60.88 | b | 71.84 | a | 77.26 | 80.93 | d | 69.48 | b | 57.67 | b | 39.72 | 38.94 | 54.09 | |||||||
1956 | 36.35 | 31.14 | 46.92 | g | 56.07 | 64.53 | b | 70.83 | 80.42 | 75.85 | 69.18 | 54.42 | 39.32 | 33.34 | c | 55.59 | a | |||||||||
1957 | 26.11 | 38.75 | 47.55 | b | 53.02 | a | 62.69 | 72.22 | a | 79.79 | 76.85 | 70.33 | 53.90 | 40.50 | 38.00 | 54.98 | ||||||||||
1958 | 35.23 | 45.27 | 44.89 | 52.08 | 69.77 | 71.67 | 79.50 | 81.27 | 68.15 | 59.34 | 43.07 | 39.03 | 57.44 | |||||||||||||
1959 | 39.11 | 40.43 | 46.03 | 57.12 | 58.58 | 75.17 | 82.47 | 76.85 | 64.62 | 56.05 | 41.72 | 33.10 | 55.94 | |||||||||||||
1960 | 27.66 | 36.41 | 47.61 | 55.38 | 61.13 | 75.08 | 85.18 | 75.00 | 71.37 | 55.18 | 43.72 | 33.13 | 55.57 | |||||||||||||
1961 | 34.52 | 43.98 | 47.69 | 53.80 | 64.18 | 78.67 | 82.79 | 82.27 | 62.77 | 54.42 | a | 41.33 | 33.81 | 56.69 | ||||||||||||
1962 | 24.55 | 34.73 | 43.10 | 58.72 | 60.82 | 70.90 | 77.68 | 76.34 | 69.50 | 56.23 | 45.52 | 37.79 | 54.66 | |||||||||||||
1963 | 27.60 | 45.96 | 47.66 | 51.38 | 65.11 | 68.07 | 77.69 | 78.44 | 72.45 | 60.44 | 44.58 | 31.08 | 55.87 | |||||||||||||
1964 | 31.06 | 34.00 | 41.85 | a | 51.97 | a | 61.71 | 67.67 | 81.03 | 75.81 | 65.73 | 58.08 | 42.20 | 38.16 | 54.11 | |||||||||||
1965 | 35.81 | 41.59 | 43.94 | 55.78 | 60.45 | 69.87 | 78.29 | 74.68 | 62.13 | 59.44 | 47.42 | 34.21 | 55.30 | |||||||||||||
1966 | 37.42 | 38.00 | 47.74 | 55.37 | 67.19 | 70.23 | 79.81 | 78.35 | 71.78 | 54.87 | 46.35 | 35.37 | 56.87 | |||||||||||||
1967 | 39.92 | 42.89 | 46.92 | 48.72 | 62.77 | 70.20 | 83.63 | 82.42 | a | 73.12 | a | 55.77 | 44.80 | 32.00 | 56.93 | |||||||||||
1968 | 33.05 | 44.47 | 50.40 | 52.45 | 62.61 | 72.85 | 81.66 | 72.34 | 67.17 | 55.87 | 42.92 | 36.21 | 56.00 | |||||||||||||
1969 | 35.50 | 37.12 | 44.89 | 56.22 | 67.44 | 71.07 | 79.98 | 79.42 | a | 69.32 | 50.95 | 42.93 | 36.84 | 55.97 | ||||||||||||
1970 | 38.61 | 43.70 | 45.39 | 48.67 | 62.52 | 72.55 | a | 80.29 | g | 80.61 | 62.85 | 51.92 | 45.20 | 35.47 | 53.41 | a | ||||||||||
1971 | 36.79 | 41.55 | 43.87 | 53.05 | 63.92 | 68.95 | 79.24 | 82.58 | 63.35 | 53.23 | 41.93 | 33.32 | 55.15 | |||||||||||||
1972 | 33.10 | 38.69 | 49.03 | 52.12 | 64.32 | 72.05 | 78.39 | 78.76 | 62.70 | 55.34 | 42.10 | 26.45 | 54.42 | |||||||||||||
1973 | 32.28 | a | 40.66 | 46.52 | 53.47 | a | 65.85 | 72.52 | 80.77 | 78.29 | 66.37 | 56.19 | 43.88 | 39.21 | 56.33 | |||||||||||
1974 | 32.29 | 40.17 | a | 45.63 | 53.55 | 61.34 | 76.72 | a | 78.81 | 77.21 | 70.65 | d | 56.21 | 44.98 | f | 35.74 | 57.12 | a | ||||||||
1975 | 31.11 | 39.43 | a | 45.19 | 47.77 | 60.81 | 69.15 | 82.40 | 74.82 | 69.42 | 56.34 | 42.27 | 35.45 | 54.51 | ||||||||||||
1976 | 35.05 | 38.09 | 41.74 | 53.02 | a | 66.23 | 69.52 | 80.39 | 72.53 | 68.25 | 55.42 | 44.22 | 32.44 | 54.74 | ||||||||||||
1977 | 24.08 | 38.16 | 45.00 | 59.97 | 59.10 | 76.20 | 78.63 | 78.42 | 66.80 | 55.84 | 42.50 | 38.62 | a | 55.28 | ||||||||||||
1978 | 39.42 | 41.05 | 51.94 | 53.02 | d | 60.10 | a | 70.92 | 78.55 | 77.08 | 66.27 | 57.61 | 39.60 | 30.23 | 55.48 | |||||||||||
1979 | 21.08 | 37.05 | 48.15 | 53.27 | 64.24 | 73.30 | 80.95 | 77.00 | 71.75 | 58.42 | 38.37 | 39.17 | j | 56.69 | a | |||||||||||
1980 | 33.00 | 41.69 | 46.32 | 58.27 | 61.92 | 67.97 | 79.19 | 75.02 | 67.03 | 55.68 | 41.82 | 34.50 | 55.20 | |||||||||||||
1981 | 35.42 | 39.98 | 48.16 | 54.73 | 60.32 | 69.57 | 78.60 | a | 80.79 | 69.63 | 52.66 | 46.83 | 38.18 | 56.24 | ||||||||||||
1982 | 29.60 | 34.46 | 45.70 | c | 50.07 | c | 61.98 | c | 72.39 | c | 75.44 | 78.13 | ----- | z | 54.75 | a | 38.90 | 34.81 | 52.38 | a | ||||||
1983 | 36.11 | 43.21 | b | 48.32 | 50.37 | 60.92 | a | 69.91 | a | 75.87 | 79.38 | a | 67.27 | b | 56.35 | a | 45.72 | 29.93 | c | 55.28 | ||||||
1984 | 26.84 | b | 33.61 | a | 46.67 | a | 51.57 | c | 60.03 | a | 65.36 | a | 80.09 | b | 80.29 | c | 64.66 | a | 51.67 | a | 42.91 | b | 28.28 | b | 52.66 | |
1985 | 24.97 | 30.54 | a | 41.25 | a | 58.52 | 65.50 | 74.95 | j | 84.48 | a | 75.77 | 61.60 | a | 53.15 | 32.91 | a | 17.32 | a | 49.64 | a | |||||
1986 | 34.26 | 44.09 | a | 52.60 | a | 53.68 | 63.80 | a | 77.72 | 76.37 | 81.65 | 62.77 | 56.28 | a | 44.93 | a | 31.57 | b | 56.64 | |||||||
1987 | 30.82 | 40.00 | 48.05 | ----- | z | 67.61 | 74.95 | 76.08 | a | 75.72 | a | 69.45 | a | 58.48 | 42.43 | b | 34.15 | 56.16 | a | |||||||
1988 | 29.89 | 40.19 | 48.47 | 57.60 | 62.68 | 74.95 | 80.43 | a | 74.56 | 66.18 | 64.66 | b | 44.33 | 31.42 | 56.28 | |||||||||||
1989 | 29.48 | 28.69 | a | 48.44 | 58.47 | a | 61.67 | b | 74.63 | 82.23 | 75.10 | 68.60 | 55.21 | 42.21 | a | 33.52 | 54.85 | |||||||||
1990 | 37.61 | 38.39 | 49.47 | 60.48 | 60.21 | 72.27 | b | 80.31 | b | 77.65 | 73.40 | 55.60 | 43.17 | 22.02 | c | 55.88 | ||||||||||
1991 | 26.07 | b | 44.18 | 47.97 | 52.75 | 59.82 | 68.82 | 81.42 | 81.11 | 69.34 | a | 55.20 | a | 39.40 | a | 33.65 | a | 54.98 | ||||||||
1992 | 35.40 | 44.30 | a | 52.00 | 58.72 | 67.39 | d | 72.74 | a | 74.53 | 78.04 | d | 67.66 | b | 58.04 | d | 39.15 | 31.40 | a | 56.61 | ||||||
1993 | 27.40 | b | 32.88 | 44.88 | a | 52.83 | 67.00 | 66.28 | e | 69.53 | 72.23 | a | 68.77 | b | 56.52 | c | 35.50 | 35.27 | a | 52.42 | ||||||
1994 | 34.87 | 36.54 | a | 51.13 | 56.32 | 66.35 | a | 73.20 | 81.78 | a | 80.48 | 70.67 | 55.23 | a | 37.02 | 31.50 | a | 56.26 | ||||||||
1995 | 37.26 | 44.58 | b | 47.71 | 51.96 | b | 61.46 | d | 68.09 | a | 77.79 | 74.28 | a | 67.87 | c | 52.98 | k | 46.41 | c | 32.82 | f | 57.74 | b | |||
1996 | 35.71 | g | 36.08 | e | 46.63 | h | 50.29 | i | 59.56 | f | 69.80 | h | 80.38 | g | 75.88 | c | 65.10 | f | 53.98 | c | 43.24 | a | 37.77 | e | 49.39 | g |
1997 | 34.50 | c | 39.63 | a | ----- | z | 51.29 | b | 64.90 | a | 69.58 | e | 76.65 | a | 77.62 | b | 70.00 | c | 54.37 | d | 43.86 | a | 32.36 | c | 55.89 | a |
1998 | 39.91 | b | 40.07 | e | 47.17 | e | 52.04 | b | 59.38 | c | ----- | z | ----- | z | 80.14 | b | 72.40 | f | 54.72 | f | 44.91 | b | 33.30 | c | 49.61 | d |
1999 | 36.78 | b | 39.22 | e | 45.17 | b | 51.13 | d | 58.61 | c | 69.67 | c | 76.36 | c | 78.17 | d | 66.36 | b | 56.11 | c | 48.61 | c | 33.36 | b | 54.96 | |
2000 | 34.06 | g | 43.02 | c | 46.48 | b | 57.19 | d | 62.59 | c | 72.17 | a | 78.85 | d | 78.26 | d | 63.61 | h | ----- | z | 52.67 | i | 33.77 | c | 59.04 | d |
2001 | 31.25 | a | 37.20 | a | 49.78 | b | 51.18 | b | 66.35 | d | 71.50 | e | 77.14 | f | 81.10 | a | 70.50 | e | 55.74 | f | 46.34 | b | 34.21 | 53.94 | b | |
2002 | 35.58 | e | 36.72 | c | 43.46 | f | 54.40 | e | 62.48 | b | 72.69 | a | 82.13 | 74.42 | g | 66.92 | e | 53.07 | d | 42.34 | a | 38.91 | d | 54.52 | b | |
2003 | 39.03 | a | 39.46 | 49.24 | 53.05 | b | 62.84 | b | 72.86 | a | 83.94 | d | 79.25 | a | 68.67 | c | 60.48 | d | 39.33 | d | 38.76 | b | 57.24 | |||
2004 | 32.53 | b | 37.50 | d | 51.72 | a | 56.87 | 61.79 | 72.25 | d | 80.52 | c | 77.23 | a | 66.02 | e | 55.59 | c | 40.48 | e | 36.80 | c | 55.78 | |||
2005 | 35.02 | e | 39.67 | a | 48.96 | d | 53.80 | 62.03 | b | 67.73 | 80.34 | 79.04 | e | 64.53 | a | 55.69 | b | 40.10 | e | 31.52 | f | 56.99 | a | |||
2006 | 39.72 | d | 37.56 | b | 45.02 | 54.72 | a | 64.10 | b | 74.18 | 83.17 | b | 75.62 | a | 64.96 | d | 53.73 | a | 43.71 | a | 34.03 | b | 55.88 | |||
2007 | 31.62 | e | 41.84 | ----- | z | 53.31 | c | 65.88 | b | 71.90 | e | 84.85 | a | 78.04 | c | 65.22 | e | 52.47 | b | 42.65 | c | 32.98 | d | 56.43 | a | |
2008 | 31.75 | c | 38.91 | a | 42.88 | a | 48.79 | b | 61.88 | a | 71.70 | g | 79.38 | a | 77.89 | c | 66.10 | 54.08 | a | 44.81 | c | 32.78 | d | 52.66 | a | |
2009 | 32.41 | b | 36.82 | c | 43.84 | c | 51.96 | d | 63.73 | a | 69.74 | a | 79.50 | 76.07 | a | 71.50 | 50.52 | b | 42.40 | a | 27.69 | d | 53.85 | |||
2010 | 37.42 | 41.31 | a | 45.66 | b | 50.43 | c | 55.55 | b | 67.58 | 78.25 | c | 76.19 | j | 66.96 | g | 57.55 | a | 41.22 | 35.69 | b | 51.07 | b | |||
2011 | 32.98 | a | 35.82 | c | 45.18 | c | 48.98 | b | 56.53 | a | 66.38 | a | 76.63 | a | 78.48 | a | 70.91 | a | 55.42 | 41.26 | a | 32.52 | a | 53.43 | ||
2012 | 35.91 | c | 40.31 | c | 47.00 | a | 56.50 | c | 60.35 | a | 68.45 | 81.53 | 79.62 | c | 68.62 | 54.00 | a | 44.20 | 36.50 | a | 56.08 | |||||
2013 | 20.85 | 38.20 | 45.14 | b | 52.62 | a | 62.40 | 70.30 | 83.50 | 80.43 | a | 69.05 | 52.00 | b | 41.58 | 25.95 | 53.50 | |||||||||
2014 | 33.09 | c | 41.25 | b | 48.33 | d | 53.39 | b | 63.45 | a | 70.03 | a | 81.85 | e | 76.82 | 68.52 | 57.66 | 37.50 | a | 38.60 | 55.87 | |||||
2015 | 31.67 | a | 44.39 | 49.40 | a | 52.58 | 62.53 | a | 78.35 | f | 79.28 | b | 78.93 | a | 67.53 | 61.44 | 41.09 | a | 34.52 | b | 54.85 | a | ||||
2016 | 35.20 | a | 41.86 | 49.61 | 59.10 | e | 63.20 | f | 73.91 | b | 78.69 | 77.58 | 66.08 | 58.11 | 48.03 | 26.32 | 55.86 | a | ||||||||
2017 | 23.39 | 39.59 | a | 50.74 | 51.57 | 61.42 | 72.12 | 84.05 | 80.24 | 68.02 | 52.15 | 45.78 | a | 30.90 | 55.00 | |||||||||||
2018 | 38.59 | b | 38.54 | 46.26 | 53.60 | 66.85 | 70.07 | b | 81.53 | 78.35 | a | 67.22 | 54.74 | 41.47 | 35.32 | 56.04 | ||||||||||
2019 | 36.90 | 37.38 | 44.94 | 54.93 | 61.44 | 69.95 | 78.73 | 78.42 | 67.42 | 47.27 | 41.88 | 36.76 | 54.67 | |||||||||||||
2020 | 38.85 | 39.10 | 47.37 | a | 53.73 | 62.31 | 68.65 | 78.08 | 79.44 | 69.33 | 56.56 | 41.98 | 32.68 | 55.67 | ||||||||||||
2021 | 37.21 | 38.00 | 45.70 | a | 53.85 | 61.89 | 77.00 | 85.56 | 77.13 | 67.53 | 57.03 | 46.07 | b | 36.90 | 56.99 | |||||||||||
2022 | 30.98 | 34.93 | 48.02 | 49.73 | 58.13 | 69.37 | 83.27 | 83.02 | 72.25 | 57.87 | 36.73 | 31.37 | a | 54.64 | ||||||||||||
2023 | 34.66 | 35.25 | 39.19 | 49.02 | 65.13 | 68.03 | 81.34 | 77.82 | 67.93 | 56.29 | 42.18 | 36.26 | 54.43 | |||||||||||||
2024 | 32.60 | 41.50 | 44.52 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.05 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 32.67 | 38.86 | 46.28 | 53.74 | 62.66 | 70.62 | 79.99 | 77.81 | 67.82 | 55.80 | 42.36 | 34.01 | 55.23 | |||||||||||||
S.D. | 5.44 | 3.62 | 2.90 | 2.94 | 2.84 | 3.20 | 2.64 | 2.32 | 2.77 | 2.78 | 3.14 | 3.90 | 1.16 | |||||||||||||
SKEW | -0.94 | -0.36 | -0.12 | 0.19 | 0.01 | 0.18 | -0.62 | -0.05 | -0.30 | -0.07 | -0.30 | -1.38 | -0.31 | |||||||||||||
MAX | 44.69 | 45.96 | 52.60 | 60.48 | 69.77 | 78.67 | 85.56 | 83.02 | 73.40 | 64.66 | 49.19 | 39.40 | 57.44 | |||||||||||||
MIN | 14.47 | 28.69 | 39.19 | 47.77 | 55.55 | 63.36 | 69.53 | 72.23 | 61.59 | 47.27 | 32.91 | 17.32 | 52.42 | |||||||||||||
YRS | 87 | 88 | 83 | 86 | 86 | 83 | 85 | 87 | 84 | 85 | 86 | 86 | 66 |