YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1937 | 19.57 | c | 37.39 | 41.84 | 47.07 | a | 72.16 | 74.00 | 85.67 | a | 84.52 | 76.87 | 65.63 | a | 50.50 | 42.52 | 58.14 | |||||||||
1938 | 39.29 | 37.14 | 41.32 | 56.07 | 65.16 | 75.47 | 85.26 | 82.42 | 76.97 | 59.10 | 42.30 | 41.00 | k | 60.04 | a | |||||||||||
1939 | 38.11 | d | 36.11 | 51.13 | 64.60 | 69.74 | 70.87 | 86.94 | 86.90 | 75.69 | a | 63.55 | 54.23 | 44.00 | 61.82 | |||||||||||
1940 | 36.58 | 39.62 | 51.42 | 57.67 | 72.63 | a | 82.52 | a | 84.90 | 88.13 | 70.80 | 61.55 | 39.47 | 40.07 | a | 60.45 | ||||||||||
1941 | 36.81 | 39.75 | 52.13 | 56.62 | a | 65.13 | 70.07 | 84.90 | 78.29 | 66.60 | 58.84 | 47.83 | 36.55 | 57.79 | ||||||||||||
1942 | 28.06 | 34.57 | 43.65 | 57.77 | 58.60 | a | 68.57 | 86.03 | 85.81 | 76.40 | 64.06 | 42.77 | 36.26 | 56.88 | ||||||||||||
1943 | 32.06 | 39.15 | a | 45.97 | 60.30 | 62.06 | 66.13 | 82.11 | d | 80.06 | 81.20 | 59.57 | a | 45.63 | 37.73 | a | 57.67 | |||||||||
1944 | 30.00 | 36.38 | 45.94 | 53.73 | 64.84 | 66.33 | 79.61 | 81.60 | a | 74.83 | 66.19 | 38.10 | 33.63 | a | 55.93 | |||||||||||
1945 | 36.87 | 41.04 | 43.77 | 54.63 | 62.10 | 69.83 | a | 86.68 | 84.06 | 73.13 | 64.42 | 42.07 | 33.97 | 57.71 | ||||||||||||
1946 | 33.90 | 37.11 | 46.07 | a | 60.20 | 65.23 | 70.33 | 83.33 | a | 84.32 | 70.90 | 51.30 | a | 44.53 | 42.97 | 57.52 | ||||||||||
1947 | 37.68 | c | 46.54 | 53.81 | 58.00 | i | 75.45 | 71.83 | 88.28 | f | 82.71 | n | 75.26 | c | 62.57 | j | 42.36 | b | 38.13 | 55.13 | d | |||||
1948 | 42.00 | e | 39.24 | 43.42 | 52.50 | 62.55 | 74.60 | 82.27 | a | 80.39 | 71.13 | 61.52 | 43.10 | 32.10 | 57.07 | |||||||||||
1949 | 25.81 | 35.82 | 43.68 | 63.83 | 68.83 | b | 78.31 | n | 85.17 | b | 83.63 | a | 77.54 | b | 56.54 | c | 56.50 | 36.23 | e | 57.60 | a | |||||
1950 | 30.42 | 39.44 | a | 44.93 | a | 59.07 | c | 64.73 | a | 71.93 | 84.77 | a | 84.07 | c | 74.15 | c | 65.08 | e | 47.97 | a | 40.57 | a | 58.93 | |||
1951 | 33.29 | 39.96 | a | 43.16 | 62.00 | a | 65.77 | a | 74.85 | d | 86.59 | d | 83.52 | 79.48 | a | 56.65 | 43.77 | 33.43 | a | 58.54 | ||||||
1952 | 33.27 | a | 37.79 | 39.90 | a | 63.70 | g | 66.58 | 70.90 | a | 85.48 | 84.58 | 79.43 | 71.97 | 48.83 | a | 38.33 | a | 59.73 | a | ||||||
1953 | 46.80 | a | 47.82 | 49.71 | 55.00 | 58.16 | 66.31 | a | 86.52 | 81.57 | a | 83.24 | e | 67.21 | g | 52.97 | 42.58 | 60.97 | a | |||||||
1954 | 39.97 | a | 47.42 | b | 46.81 | 60.13 | 71.03 | a | 68.97 | 86.39 | 78.93 | a | 74.31 | a | 64.43 | c | 55.80 | 37.97 | a | 61.01 | ||||||
1955 | 35.00 | 40.12 | b | 48.57 | a | 47.07 | 62.33 | a | 78.10 | 80.13 | a | 89.00 | b | 76.45 | a | 65.14 | b | 45.34 | a | 40.81 | 59.00 | |||||
1956 | 38.97 | 36.66 | 49.55 | b | 63.10 | 65.43 | c | 69.03 | 85.00 | a | 81.48 | d | 75.90 | 63.41 | b | 53.30 | c | 40.70 | a | 60.21 | ||||||
1957 | 30.35 | 44.08 | b | 48.67 | a | 58.07 | a | 64.58 | 75.87 | 82.00 | 79.19 | 78.64 | b | 53.82 | c | 44.31 | a | 39.90 | 58.29 | |||||||
1958 | 34.45 | 43.37 | a | 41.50 | a | 51.97 | 71.97 | 72.14 | a | 82.66 | b | 85.52 | 71.43 | 67.30 | a | 48.37 | c | 44.13 | a | 59.57 | ||||||
1959 | 39.70 | a | 39.96 | b | 50.00 | 62.48 | a | 61.23 | 77.33 | 88.29 | 81.97 | 68.83 | a | 62.84 | 54.80 | 37.81 | e | 60.44 | ||||||||
1960 | 33.58 | g | 35.50 | a | 50.70 | a | 55.97 | 60.80 | a | 78.23 | 89.77 | 80.19 | 79.21 | a | 63.66 | b | 44.28 | a | 38.72 | b | 61.55 | a | ||||
1961 | 40.87 | a | 45.04 | b | 47.60 | a | 58.08 | d | 61.23 | 82.87 | 88.29 | 88.16 | 69.57 | 63.34 | b | 46.60 | 36.33 | a | 60.66 | |||||||
1962 | 32.28 | b | 38.19 | a | 40.74 | d | 63.33 | c | 59.84 | 75.55 | a | 83.03 | 81.36 | f | 77.29 | f | 61.33 | a | 48.66 | a | 41.46 | c | 54.44 | b | ||
1963 | 38.00 | a | 50.67 | a | 48.42 | 49.50 | 65.48 | 71.38 | a | 79.52 | 83.29 | 78.60 | 64.43 | a | 46.73 | h | 40.00 | a | 60.84 | a | ||||||
1964 | 36.13 | a | 41.64 | a | 43.30 | a | 55.67 | 63.83 | b | 69.79 | b | 83.37 | d | 82.31 | b | 74.10 | a | 69.13 | a | 45.24 | e | 36.76 | b | 58.44 | ||
1965 | 36.14 | b | 45.04 | 48.80 | a | 56.83 | 64.29 | c | 73.36 | b | 83.13 | a | 78.57 | c | 69.93 | a | 69.46 | c | 48.13 | 36.04 | e | 59.14 | ||||
1966 | 36.70 | a | 38.41 | a | 53.25 | g | 61.63 | c | 73.00 | c | 71.33 | o | 80.94 | 83.68 | 75.07 | a | 63.13 | a | 46.59 | a | 35.48 | b | 59.46 | b | ||
1967 | 38.60 | a | 44.50 | f | 42.81 | 45.45 | a | 64.65 | 74.03 | a | 86.94 | 89.03 | a | 78.61 | b | 60.63 | d | 53.48 | i | 35.86 | c | 61.66 | b | |||
1968 | 36.33 | a | 47.07 | 52.61 | 53.37 | 62.97 | 74.48 | a | 87.42 | 73.68 | 71.93 | 58.68 | 41.67 | 34.50 | a | 57.89 | ||||||||||
1969 | 33.39 | 35.75 | 43.76 | j | 55.93 | 67.94 | 71.60 | 82.52 | 84.23 | 75.50 | 53.71 | 50.10 | 39.73 | a | 59.13 | a | ||||||||||
1970 | 37.06 | 46.33 | a | 46.45 | 48.60 | 65.32 | 75.33 | 85.71 | 87.61 | 68.73 | 58.10 | 45.23 | 35.46 | e | 58.33 | |||||||||||
1971 | 39.33 | g | 43.82 | 42.97 | a | 53.96 | b | 63.48 | 67.20 | 83.68 | 88.97 | 69.13 | 55.81 | 44.60 | 33.38 | b | 58.82 | a | ||||||||
1972 | 34.00 | a | 40.28 | 51.35 | 52.77 | 68.03 | 77.46 | b | 83.13 | a | 83.42 | 68.00 | b | 60.65 | 41.90 | 29.39 | 57.53 | |||||||||
1973 | 33.19 | 40.11 | a | 44.42 | 55.37 | 68.93 | a | 76.17 | a | 85.55 | 83.93 | a | 71.63 | 59.13 | 40.40 | 38.58 | 58.12 | |||||||||
1974 | 31.94 | 40.82 | 44.13 | 51.53 | 61.26 | 80.47 | 81.74 | 82.06 | 79.30 | 62.94 | 46.83 | 37.52 | b | 58.38 | ||||||||||||
1975 | 37.26 | d | 38.70 | h | 46.31 | r | 46.35 | d | 64.30 | d | 73.07 | 85.08 | f | 78.53 | a | 79.70 | 56.55 | 45.43 | 44.68 | i | 60.15 | d | ||||
1976 | 40.08 | e | 40.54 | e | 45.00 | 52.97 | a | 68.28 | b | 69.63 | 82.68 | 71.84 | 73.77 | 63.10 | b | 54.45 | a | 44.84 | 58.93 | |||||||
1977 | 32.32 | 45.64 | 43.77 | 60.87 | 54.23 | 78.10 | 81.32 | 84.03 | 68.97 | 61.84 | 43.48 | a | 38.39 | 57.75 | ||||||||||||
1978 | 36.77 | 40.14 | 51.90 | ----- | z | 58.65 | 73.03 | 83.06 | 80.03 | 68.55 | a | 67.81 | 43.60 | 33.13 | 57.88 | a | ||||||||||
1979 | 28.10 | a | 37.46 | b | 51.21 | g | 53.13 | 65.90 | 75.73 | 84.61 | 79.87 | 77.23 | 63.65 | 41.20 | 38.61 | 58.68 | a | |||||||||
1980 | 35.10 | 43.03 | 44.42 | 56.80 | 61.87 | 67.00 | a | 81.42 | 79.48 | 72.63 | 60.07 | a | 45.65 | d | 41.42 | e | 57.41 | |||||||||
1981 | 38.00 | l | 39.79 | 47.03 | 53.93 | b | 59.31 | b | 71.10 | 79.40 | a | 88.16 | 74.37 | 55.25 | c | 47.19 | d | 37.00 | k | 61.55 | b | |||||
1982 | ----- | z | ----- | z | 49.43 | x | 51.64 | p | 61.94 | m | 72.32 | b | 78.92 | e | 82.42 | e | 69.52 | g | 56.00 | g | 43.11 | k | 34.82 | t | 77.89 | i |
1983 | 43.15 | r | 42.50 | r | 46.07 | p | 52.33 | u | 66.61 | h | 70.74 | g | 74.29 | c | 82.65 | e | 73.13 | g | 62.58 | l | 44.81 | n | 34.18 | n | 78.47 | j |
1984 | 34.12 | n | 39.83 | q | 48.00 | s | 50.20 | o | 61.57 | q | 67.82 | m | 87.20 | k | 86.38 | o | 73.78 | u | 69.33 | y | 41.62 | q | 30.90 | 30.90 | k | |
1985 | 29.35 | 35.82 | 41.97 | a | 59.97 | a | 67.00 | g | 77.50 | p | 88.38 | g | 80.42 | e | 63.64 | p | 62.36 | q | 33.47 | m | 28.30 | k | 49.51 | g | ||
1986 | 37.71 | g | 44.23 | f | 52.43 | a | 53.54 | b | 61.81 | e | 80.96 | f | 78.07 | a | 87.96 | c | 60.67 | f | 62.73 | a | 47.19 | c | 34.84 | 59.82 | d | |
1987 | 33.03 | 40.68 | 46.60 | a | 64.62 | a | 68.72 | b | 78.12 | e | 77.24 | f | 82.83 | g | 79.00 | 70.60 | a | 41.86 | i | 36.65 | e | 57.56 | c | |||
1988 | 33.07 | a | 45.17 | 49.19 | 57.17 | a | 64.37 | a | 73.46 | b | 86.45 | b | 83.84 | 73.55 | a | 72.48 | 42.77 | 35.19 | 59.73 | |||||||
1989 | 33.57 | a | 30.04 | 45.81 | 59.27 | 61.77 | a | 76.21 | b | 84.81 | 76.44 | f | 71.90 | a | 60.45 | 50.21 | a | 42.81 | d | 56.08 | a | |||||
1990 | 41.10 | a | 40.54 | 50.00 | b | 64.74 | c | 60.50 | a | 74.33 | c | 85.90 | a | 81.59 | b | 79.59 | c | 60.03 | a | 46.93 | ----- | z | 62.30 | a | ||
1991 | 39.94 | 49.61 | 45.19 | 52.57 | b | 58.90 | a | 67.13 | 85.19 | 85.10 | 79.00 | 64.58 | 43.30 | 39.53 | a | 59.17 | ||||||||||
1992 | 37.42 | 47.30 | b | 55.26 | 60.60 | 74.94 | 78.90 | a | 79.03 | b | 85.06 | 73.19 | d | 64.38 | e | 39.53 | 32.61 | 60.69 | ||||||||
1993 | 28.16 | 30.15 | a | 43.71 | c | 51.36 | h | 67.63 | d | 67.68 | b | 73.38 | b | 76.96 | c | 76.40 | 64.16 | 43.30 | ----- | z | 57.15 | b | ||||
1994 | ----- | z | 39.61 | 54.81 | 58.10 | a | 66.65 | 75.32 | b | 87.63 | a | 85.90 | 77.63 | 59.06 | 36.18 | b | 36.96 | c | 61.62 | a | ||||||
1995 | 37.26 | h | 51.19 | b | 45.97 | a | 51.85 | c | 62.03 | a | 70.00 | b | 82.00 | d | 80.10 | b | 76.71 | b | 59.93 | c | 51.86 | b | 35.21 | c | 60.62 | a |
1996 | 37.13 | a | 36.91 | f | 48.97 | b | 55.90 | a | 59.93 | a | ----- | z | 86.86 | c | 84.18 | c | 68.90 | a | 57.34 | b | 46.46 | d | 38.04 | d | 58.37 | b |
1997 | 35.59 | d | 37.38 | b | 47.57 | c | 50.04 | d | 70.40 | f | 70.69 | d | 81.21 | c | 83.53 | a | 72.52 | c | 54.61 | c | 43.17 | g | 32.39 | h | 59.24 | c |
1998 | 38.19 | d | 36.38 | d | 43.05 | k | 52.44 | c | 56.37 | a | 68.60 | 86.77 | 85.61 | 78.78 | c | 58.90 | a | 42.95 | h | 39.53 | a | 60.16 | b | |||
1999 | 42.13 | a | 39.38 | b | 44.45 | ----- | z | 63.61 | 72.93 | a | 82.55 | 82.03 | 69.83 | a | 66.33 | a | 52.86 | b | 40.14 | c | 59.66 | a | ||||
2000 | 38.44 | m | 37.00 | i | 47.36 | f | 60.74 | c | 63.43 | a | 79.79 | f | 85.90 | k | ----- | z | 73.00 | i | 62.52 | h | 38.27 | o | 39.21 | l | 62.09 | j |
2001 | 33.81 | j | 36.53 | i | 49.18 | n | 55.90 | j | 75.42 | 73.67 | l | 89.55 | k | 92.11 | l | 79.08 | d | 66.33 | d | 50.10 | a | 35.75 | c | 61.34 | g | |
2002 | 38.00 | b | 40.93 | 48.14 | i | 59.36 | b | 64.80 | a | 76.37 | 93.10 | 85.94 | n | 80.76 | a | 62.87 | 54.60 | 43.60 | a | 61.44 | b | |||||
2003 | 44.47 | a | 46.07 | 55.24 | b | 52.07 | 68.65 | 81.40 | 92.13 | h | 87.00 | j | 75.53 | m | 65.72 | b | 42.88 | f | 38.00 | e | 56.45 | d | ||||
2004 | 33.89 | c | 37.77 | g | 54.88 | g | 59.96 | d | 63.52 | j | 75.25 | f | 87.70 | h | 85.45 | i | 73.90 | j | 60.62 | g | 46.59 | h | 41.05 | j | 46.93 | j |
2005 | 35.38 | e | 42.81 | b | 51.20 | f | 54.68 | h | 63.27 | i | 69.14 | h | 88.95 | l | 84.95 | k | 75.50 | j | 61.10 | j | 44.00 | h | 33.65 | k | 39.10 | j |
2006 | 38.15 | k | 40.39 | j | 43.27 | i | 46.12 | n | 61.00 | q | 75.80 | j | 89.00 | n | 82.45 | i | 68.07 | o | 60.85 | k | 46.94 | m | 37.72 | m | ----- | z |
2007 | 36.11 | m | 42.65 | h | 53.30 | k | 56.75 | n | 64.24 | n | 72.83 | l | 87.38 | r | 82.33 | m | 64.06 | n | 55.89 | m | 47.75 | n | 41.41 | n | ----- | z |
2008 | 33.45 | i | 43.36 | g | 45.12 | n | 51.10 | i | 63.32 | l | 74.37 | k | 84.52 | j | 83.95 | l | 76.86 | h | 65.90 | j | 51.27 | o | 39.68 | i | ----- | z |
2009 | 41.80 | k | 40.60 | h | 45.29 | j | 56.16 | k | 65.05 | l | 73.00 | j | 86.24 | j | 85.00 | l | 76.80 | j | 53.52 | j | 46.90 | i | 34.00 | k | ----- | z |
2010 | 38.61 | m | 40.11 | j | 48.73 | i | 51.65 | j | 56.30 | k | 70.37 | k | 84.39 | m | 78.91 | i | 76.10 | j | 62.03 | a | 42.17 | 34.39 | 46.20 | i | ||
2011 | 36.06 | 39.21 | 42.39 | 48.86 | a | 55.03 | 67.13 | 80.48 | 85.45 | 79.70 | 61.34 | b | ----- | z | 41.35 | 57.91 | a | |||||||||
2012 | 41.23 | a | 41.86 | 47.23 | a | 56.53 | 66.03 | a | 71.30 | 86.03 | 87.82 | c | 79.83 | 63.03 | 46.67 | 36.29 | 60.32 | |||||||||
2013 | 29.23 | a | 39.24 | c | 50.10 | a | 55.40 | 66.81 | d | 74.45 | a | 90.16 | 84.03 | 69.94 | l | 57.13 | 48.90 | 36.60 | a | 57.46 | a | |||||
2014 | 45.13 | a | 41.96 | a | 51.03 | 52.74 | c | 64.74 | 72.14 | i | 88.11 | d | 80.90 | b | 74.70 | 65.43 | a | 43.27 | h | 38.06 | 60.28 | b | ||||
2015 | 42.29 | g | 48.93 | 55.35 | 56.73 | 60.40 | k | 81.27 | 81.45 | 83.13 | 73.37 | 66.45 | 41.13 | 16.32 | 60.41 | b | ||||||||||
2016 | 32.45 | 43.72 | 47.72 | b | 61.80 | 63.94 | 74.97 | 81.33 | y | 84.03 | a | 70.03 | 56.42 | 48.90 | 28.94 | 55.72 | a | |||||||||
2017 | 25.39 | 35.75 | x | 51.36 | f | 52.07 | c | 66.17 | a | 70.80 | t | ----- | z | 85.58 | 33.40 | 56.74 | 43.63 | 33.65 | 49.58 | d | ||||||
2018 | 41.39 | 38.54 | 43.97 | 50.40 | 67.29 | 72.03 | 83.59 | n | 82.84 | 73.00 | i | 49.58 | 41.85 | c | 26.54 | r | 54.21 | c | ||||||||
2019 | 37.32 | 33.41 | a | 42.61 | c | ----- | z | ----- | z | 71.60 | 81.74 | 83.52 | 69.17 | 52.68 | 49.37 | 34.90 | 55.63 | b | ||||||||
2020 | 36.00 | g | 43.14 | 46.39 | 56.33 | 64.81 | 68.73 | o | 85.23 | 84.97 | 79.48 | a | 64.94 | 44.00 | 36.23 | 60.55 | b | |||||||||
2021 | 38.52 | 41.48 | c | 50.77 | 59.35 | d | 64.10 | 83.63 | 91.74 | 85.71 | 76.70 | 60.19 | 39.17 | 35.00 | 60.53 | |||||||||||
2022 | 39.52 | 43.64 | 51.58 | 48.93 | b | 55.19 | 71.00 | 87.21 | c | 88.77 | 78.21 | a | 67.03 | 34.53 | 29.84 | 57.96 | ||||||||||
2023 | 33.71 | 35.74 | a | 35.68 | 50.43 | 65.58 | 71.97 | a | 87.84 | 82.42 | 71.71 | b | 60.39 | 46.73 | 35.97 | b | 56.51 | |||||||||
2024 | 38.42 | 42.00 | 47.21 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.54 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 35.60 | 40.80 | 46.99 | 55.89 | 64.64 | 73.30 | 84.12 | 83.21 | 74.24 | 61.75 | 46.01 | 37.05 | 58.73 | |||||||||||||
S.D. | 4.81 | 4.43 | 4.14 | 4.78 | 4.57 | 4.28 | 3.57 | 3.40 | 6.35 | 4.68 | 4.75 | 4.36 | 1.40 | |||||||||||||
SKEW | -0.50 | 0.17 | 0.07 | -0.09 | 0.19 | 0.43 | -0.37 | -0.63 | -3.81 | -0.19 | 0.20 | -1.46 | 0.26 | |||||||||||||
MAX | 46.80 | 51.19 | 55.35 | 64.74 | 75.45 | 83.63 | 93.10 | 89.03 | 83.24 | 72.48 | 56.50 | 44.84 | 61.82 | |||||||||||||
MIN | 19.57 | 30.04 | 35.68 | 45.45 | 54.23 | 66.13 | 73.38 | 71.84 | 33.40 | 49.58 | 34.53 | 16.32 | 55.93 | |||||||||||||
YRS | 70 | 72 | 69 | 71 | 73 | 68 | 69 | 71 | 70 | 74 | 68 | 70 | 36 |