YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | 26.58 | 35.07 | a | 39.16 | 49.40 | 56.23 | 56.10 | a | 48.29 | i | 36.13 | 32.15 | c | 26.03 | b | 39.65 | c | |||||
1940 | 19.83 | b | 21.88 | l | 29.16 | f | 35.58 | d | 46.43 | a | 55.36 | e | 59.08 | e | 57.58 | e | 49.80 | j | 39.76 | b | 25.19 | c | 22.00 | f | 42.35 | d |
1941 | 19.53 | a | 22.36 | q | ----- | z | 28.15 | d | 42.42 | g | 48.79 | b | 54.04 | f | 52.58 | e | 44.24 | i | 31.87 | p | 28.00 | e | 21.16 | f | 35.41 | g |
1942 | 17.57 | a | 11.85 | h | ----- | z | 32.65 | j | 40.15 | d | 53.68 | h | 59.19 | e | 57.46 | g | 53.38 | n | 43.92 | r | 31.03 | a | 25.32 | c | 34.65 | g |
1943 | 22.43 | c | 24.56 | c | 28.89 | d | 37.48 | g | 43.20 | f | 50.25 | b | 57.97 | b | 55.34 | b | 51.23 | d | 38.03 | b | 27.12 | d | ----- | z | 39.54 | c |
1944 | 16.10 | a | 17.18 | a | 20.52 | d | 27.32 | b | 37.63 | d | 44.80 | e | 53.23 | a | 54.13 | 46.61 | b | 37.45 | b | ----- | z | ----- | z | 35.50 | b | |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.32 | b | 56.55 | b | 56.29 | 48.87 | 39.35 | 33.20 | y | 18.82 | c | 44.53 | f | |||
1946 | 19.59 | n | ----- | z | ----- | z | 38.47 | 41.60 | a | 52.12 | e | 55.23 | 54.55 | 49.54 | b | 37.09 | i | 22.11 | u | 24.63 | a | 45.16 | e | |||
1947 | 17.47 | n | 24.80 | h | 29.25 | o | 34.93 | p | 44.13 | h | 46.36 | e | 55.13 | h | 53.12 | f | 51.76 | e | 38.13 | h | 19.80 | o | 18.96 | c | 39.03 | i |
1948 | 20.55 | b | 18.70 | b | 17.22 | h | 32.04 | e | 41.89 | c | 46.89 | c | 55.48 | 54.45 | 50.17 | 36.60 | k | 20.56 | l | ----- | z | 40.02 | d | |||
1949 | ----- | z | ----- | z | ----- | z | 38.88 | n | 41.18 | c | 48.85 | c | 56.43 | a | 53.32 | c | 49.86 | b | 34.59 | d | 34.76 | i | 29.57 | x | 47.37 | f |
1950 | 14.33 | y | 22.45 | f | 25.11 | d | 35.15 | d | 40.48 | d | 49.13 | 54.29 | 52.23 | 44.93 | 42.94 | 28.60 | 26.39 | m | 41.43 | c | ||||||
1951 | 21.00 | k | 22.29 | d | 25.42 | 32.83 | 42.03 | a | 51.20 | 59.58 | 55.03 | 50.15 | c | 37.30 | d | 24.69 | d | 18.33 | j | 40.05 | b | |||||
1952 | 20.82 | c | 20.34 | 20.15 | d | 34.48 | c | 43.97 | a | 51.23 | 56.07 | a | 55.93 | b | 49.14 | h | 43.93 | c | 21.17 | a | 19.96 | h | 36.81 | b | ||
1953 | 24.26 | 20.46 | 25.87 | a | 30.79 | b | 34.55 | 50.17 | 57.03 | 52.57 | a | 51.00 | c | 38.37 | a | 30.03 | a | 18.79 | c | 36.16 | ||||||
1954 | 22.84 | 27.32 | 24.66 | b | 39.41 | a | 45.74 | 50.53 | 57.92 | e | 54.41 | i | 50.43 | b | 41.43 | c | 32.25 | b | 20.43 | a | 37.54 | a | ||||
1955 | 16.94 | 14.18 | 24.96 | g | 29.60 | 39.97 | 48.66 | a | 53.87 | a | 56.26 | 51.53 | 41.62 | b | 27.30 | 25.14 | c | 36.82 | a | |||||||
1956 | 25.31 | b | 16.46 | e | 26.26 | 31.90 | 39.22 | h | 54.48 | g | 55.84 | 53.24 | b | 53.60 | 40.57 | c | 24.11 | b | 18.81 | j | 36.37 | c | ||||
1957 | 20.16 | l | 28.64 | 27.32 | c | 30.67 | c | 37.52 | 52.20 | 56.68 | 55.10 | 50.90 | 37.84 | 23.18 | b | 25.00 | c | 38.64 | a | |||||||
1958 | 21.33 | d | 26.64 | c | 23.37 | a | 30.75 | b | 44.20 | a | 54.18 | b | 57.43 | a | 58.31 | b | 49.90 | a | 41.83 | b | 32.11 | c | 28.80 | a | 39.07 | |
1959 | 21.48 | b | 21.27 | b | 28.24 | b | 36.22 | c | 43.23 | a | 55.63 | 60.57 | a | 56.28 | b | 50.12 | e | 39.18 | c | 28.71 | b | 24.63 | a | 38.80 | ||
1960 | 16.37 | a | 17.76 | 30.97 | b | 35.00 | d | 42.07 | b | 55.87 | 59.81 | 58.87 | a | 53.48 | a | 38.71 | c | 30.18 | b | 19.33 | d | 38.20 | ||||
1961 | 21.77 | 24.50 | 26.93 | a | 33.50 | 42.74 | 57.00 | 59.69 | b | 56.74 | 45.14 | a | 38.16 | 26.65 | d | 18.07 | a | 37.58 | ||||||||
1962 | 17.94 | 25.00 | 22.67 | a | 38.55 | a | 40.97 | 50.79 | a | 57.90 | 57.90 | 51.77 | 41.45 | 33.17 | 25.10 | 38.60 | ||||||||||
1963 | 14.14 | b | 27.50 | 26.23 | a | 30.32 | b | 46.47 | a | 49.04 | d | 60.20 | a | 55.34 | b | 52.29 | b | 44.37 | d | 30.72 | a | 21.28 | b | 38.16 | ||
1964 | 16.97 | 16.82 | a | 21.50 | a | 30.21 | a | 41.86 | b | 49.53 | 59.70 | a | 55.52 | b | 48.90 | 44.32 | 25.28 | a | 20.29 | c | 35.91 | |||||
1965 | 22.79 | b | 21.37 | a | 23.58 | 32.13 | 38.33 | d | 47.48 | g | 56.80 | a | 56.64 | c | 46.60 | 43.68 | 34.33 | 24.65 | 36.45 | a | ||||||
1966 | 18.42 | 16.32 | 29.26 | 36.03 | 47.68 | 53.53 | 59.60 | a | 59.00 | a | 52.43 | 40.32 | 33.07 | 22.16 | 38.99 | |||||||||||
1967 | 20.55 | 24.29 | 31.55 | 30.47 | 40.84 | 49.83 | 58.45 | 57.39 | 51.03 | 42.84 | 33.90 | 16.10 | 38.10 | |||||||||||||
1968 | 19.35 | 27.86 | 29.55 | 31.90 | 42.45 | 54.33 | 58.81 | 54.13 | 49.87 | 42.16 | 29.30 | 17.10 | 38.07 | |||||||||||||
1969 | 24.05 | j | 22.25 | 23.74 | 35.80 | 46.97 | 51.43 | 60.27 | a | 60.35 | 53.11 | b | 35.68 | 29.13 | 25.77 | 40.41 | a | |||||||||
1970 | 21.58 | 27.96 | 25.94 | 29.07 | 44.30 | a | 52.07 | 59.90 | 59.58 | 47.27 | 35.58 | 30.23 | 22.00 | a | 37.96 | |||||||||||
1971 | 20.45 | 22.04 | 27.29 | 34.07 | 39.00 | 53.47 | 60.00 | a | 58.23 | a | 47.57 | 35.42 | 27.27 | 18.71 | 36.96 | |||||||||||
1972 | 21.19 | 26.34 | 34.52 | 34.97 | 44.26 | 53.21 | a | 60.72 | b | 56.32 | 50.03 | a | 40.03 | 24.46 | b | 18.19 | 38.69 | |||||||||
1973 | ----- | z | 23.21 | 24.35 | 28.36 | b | 43.24 | b | 52.17 | a | 58.72 | b | 57.00 | 47.93 | 41.29 | 29.50 | 22.55 | 38.94 | a | |||||||
1974 | 18.32 | 19.64 | 32.42 | 32.13 | 45.97 | 59.30 | 57.71 | 56.42 | 50.70 | 41.84 | 29.97 | 19.71 | 38.68 | |||||||||||||
1975 | 19.65 | 21.18 | 25.26 | 28.47 | 39.20 | a | 49.30 | 57.68 | 57.29 | 51.03 | 39.55 | 27.93 | 22.58 | 36.59 | ||||||||||||
1976 | 20.94 | 28.52 | 26.13 | 34.03 | 45.10 | 54.27 | 58.65 | 55.77 | 50.20 | 37.26 | 30.53 | 22.48 | 38.66 | |||||||||||||
1977 | 17.58 | 24.36 | 22.58 | 36.20 | 39.94 | 55.07 | 59.00 | 58.61 | 53.60 | 43.61 | 31.70 | 26.71 | 39.08 | |||||||||||||
1978 | 23.52 | 23.07 | 32.94 | 35.83 | 42.94 | 56.13 | 60.71 | 57.94 | 49.80 | 45.77 | 30.50 | 16.94 | 39.67 | |||||||||||||
1979 | 14.65 | 21.79 | 27.90 | 39.77 | 43.23 | 53.17 | a | 60.77 | a | 56.32 | 53.63 | 42.61 | 23.07 | a | 22.90 | 38.32 | ||||||||||
1980 | 24.13 | a | 25.41 | 23.26 | 32.79 | a | 38.29 | 51.90 | a | 56.10 | a | 54.32 | 48.50 | 36.48 | b | 29.45 | a | 28.10 | b | 37.40 | ||||||
1981 | 24.90 | 23.86 | 25.61 | 37.83 | a | 41.39 | 54.97 | a | 57.10 | a | 55.23 | 49.37 | 37.77 | a | 31.93 | a | 24.40 | a | 38.70 | |||||||
1982 | 18.62 | b | 21.46 | 26.57 | a | 31.03 | 39.10 | 48.48 | a | 55.79 | b | 55.60 | a | 50.31 | d | 31.25 | c | 25.77 | 20.03 | 35.33 | ||||||
1983 | 22.23 | a | 23.29 | 25.74 | 26.20 | 38.37 | d | 48.37 | 56.29 | 55.26 | 51.53 | 39.13 | 27.52 | a | 22.57 | a | 36.37 | |||||||||
1984 | 18.71 | 20.38 | 25.77 | 29.27 | 46.29 | 51.48 | a | 56.97 | 55.35 | 51.21 | a | 32.70 | a | 27.10 | 22.03 | 36.44 | ||||||||||
1985 | 18.80 | a | 18.50 | 27.90 | 36.47 | 44.42 | 53.00 | 57.29 | 56.26 | 44.14 | a | 39.23 | 25.77 | 23.10 | 37.07 | |||||||||||
1986 | 27.52 | 26.39 | 32.74 | 34.23 | 42.42 | 52.87 | 55.47 | a | 57.48 | 46.00 | 36.03 | a | 28.64 | b | 22.86 | b | 38.55 | |||||||||
1987 | 18.10 | b | 22.75 | 23.77 | a | 36.77 | 42.03 | 55.70 | c | 56.27 | a | 55.68 | 50.69 | d | 44.90 | a | 29.30 | c | 19.97 | b | 37.99 | |||||
1988 | 18.84 | 25.76 | 26.03 | 35.34 | a | 41.77 | 53.44 | c | 60.58 | 56.61 | 48.47 | 46.43 | a | 27.50 | d | 19.17 | a | 38.33 | ||||||||
1989 | 16.93 | a | 20.79 | 32.29 | 39.80 | 44.00 | 50.50 | 58.45 | 54.94 | 49.60 | 38.32 | 29.93 | a | 21.50 | a | 38.09 | ||||||||||
1990 | 18.90 | a | 20.81 | a | 29.52 | 36.10 | 41.13 | 54.60 | 57.84 | 55.19 | 51.80 | 38.16 | 28.41 | a | 12.76 | b | 37.10 | |||||||||
1991 | 16.83 | a | 25.70 | a | 24.10 | 30.07 | 40.45 | 50.00 | 58.19 | 57.13 | 50.67 | 40.90 | 26.34 | a | 21.23 | a | 36.80 | |||||||||
1992 | 16.16 | 23.86 | 29.10 | 39.40 | 44.19 | 50.93 | 55.87 | 55.94 | 52.52 | a | 44.39 | 24.69 | a | 18.37 | a | 37.95 | ||||||||||
1993 | 21.63 | a | 23.96 | 31.77 | a | 34.38 | a | 44.81 | 51.48 | a | 57.00 | 56.07 | c | 51.37 | 39.23 | a | 27.11 | b | 22.07 | a | 38.41 | |||||
1994 | 24.07 | a | 22.39 | 32.35 | 36.52 | a | 43.55 | 57.43 | 60.67 | a | 57.84 | 51.62 | a | 38.97 | b | 24.21 | a | 25.29 | 39.58 | |||||||
1995 | 22.57 | a | 32.39 | 29.65 | 32.69 | a | 40.87 | a | 47.79 | b | 60.15 | e | 61.63 | a | 52.37 | 41.90 | 34.27 | d | 31.69 | o | 41.48 | a | ||||
1996 | 23.32 | f | 27.69 | 28.03 | a | 35.75 | b | 46.73 | a | 56.44 | c | 62.15 | d | 59.81 | 48.53 | 38.57 | a | 31.00 | b | 22.76 | b | 41.59 | a | |||
1997 | 21.07 | c | 23.15 | a | 31.30 | d | 31.96 | d | 47.23 | e | 51.96 | e | 58.26 | d | 57.67 | a | 53.29 | i | 39.75 | c | 31.13 | g | 21.00 | a | 38.33 | b |
1998 | 24.68 | c | 21.39 | 28.57 | a | 31.17 | 42.04 | e | 50.10 | 61.97 | 61.00 | a | 53.41 | m | 39.32 | f | 30.77 | h | 21.44 | f | 40.11 | d | ||||
1999 | 26.03 | b | 25.89 | 31.38 | g | 31.03 | a | 42.72 | b | 51.93 | a | 57.77 | a | 56.18 | c | 50.07 | 43.58 | 35.87 | 22.14 | b | 40.29 | a | ||||
2000 | 24.50 | c | 27.45 | 28.62 | b | 38.43 | 47.53 | a | 56.65 | d | 60.39 | 58.35 | 52.17 | 40.32 | 22.79 | a | 25.23 | a | 40.20 | |||||||
2001 | 21.03 | b | 23.46 | d | 30.35 | 35.00 | h | 48.23 | e | 54.67 | 59.03 | 58.19 | 55.14 | a | 44.00 | b | 32.17 | a | 19.46 | c | 40.52 | a | ||||
2002 | 21.89 | d | 23.37 | a | 24.68 | c | 37.82 | b | 45.48 | d | 60.69 | a | 44.04 | d | 60.73 | e | 53.31 | d | 39.44 | f | 30.96 | g | 22.10 | j | 41.33 | c |
2003 | 28.45 | i | 24.67 | a | 28.66 | b | 31.00 | g | 48.23 | e | 53.96 | f | 64.04 | f | 57.58 | e | 52.56 | c | 45.86 | c | 28.71 | b | 22.90 | b | 38.64 | d |
2004 | 19.64 | c | 20.34 | 35.71 | 35.76 | a | 46.77 | 55.17 | 59.16 | 57.27 | a | 49.40 | 40.10 | b | 28.89 | b | 24.28 | b | 39.37 | |||||||
2005 | 27.32 | 27.11 | a | 29.13 | 35.53 | 45.70 | a | 51.61 | b | 61.77 | a | 54.07 | b | 51.00 | 41.41 | b | 31.10 | 25.17 | a | 40.08 | ||||||
2006 | 22.69 | b | 25.15 | b | 26.60 | a | 36.43 | 47.81 | 58.63 | 60.52 | 56.23 | 44.18 | b | 38.39 | 31.48 | a | 21.18 | c | 39.11 | |||||||
2007 | 13.57 | a | 24.89 | 33.13 | 35.80 | 45.41 | b | 56.66 | a | 62.90 | 60.06 | 52.40 | 40.39 | 36.14 | a | 19.73 | a | 40.09 | ||||||||
2008 | 16.63 | a | 23.28 | 27.94 | 34.40 | 40.45 | 53.14 | a | 59.53 | a | 59.45 | 52.24 | a | 41.94 | 33.25 | b | 20.19 | d | 38.54 | |||||||
2009 | 24.11 | c | 25.00 | a | 28.94 | 33.03 | 48.44 | d | 51.97 | 61.90 | b | 59.52 | 52.93 | a | 36.61 | 32.63 | c | 17.15 | e | 39.35 | ||||||
2010 | 20.21 | c | 21.82 | 27.03 | 34.47 | 39.52 | 54.86 | b | 59.61 | 56.57 | c | 53.74 | c | 42.55 | b | 25.79 | b | 27.36 | c | 38.63 | ||||||
2011 | 19.52 | d | 16.89 | 29.97 | 33.50 | 40.32 | 52.00 | 59.42 | 59.45 | b | 52.31 | d | 40.20 | a | 28.52 | c | 20.48 | d | 37.71 | |||||||
2012 | 25.28 | b | 23.41 | 29.86 | b | 39.00 | 46.94 | 56.83 | 59.20 | a | 58.23 | a | 51.73 | 42.62 | b | 33.25 | b | 21.36 | c | 40.64 | ||||||
2013 | 16.04 | c | 19.50 | 32.10 | 34.87 | 42.94 | 56.53 | 59.35 | 56.13 | 49.37 | c | ----- | z | 29.39 | b | 16.68 | 37.54 | a | ||||||||
2014 | 24.74 | 27.32 | 31.10 | a | 36.07 | 43.00 | 54.47 | 60.71 | 55.77 | 50.90 | 44.55 | 29.83 | a | 27.38 | e | 40.49 | ||||||||||
2015 | 25.76 | f | 28.89 | 35.35 | 35.64 | b | 40.42 | 55.57 | 56.84 | 58.42 | 52.90 | 44.94 | 27.23 | 19.45 | 41.42 | a | ||||||||||
2016 | 19.19 | 25.14 | 31.90 | 34.50 | 41.19 | 58.73 | 59.65 | 55.45 | 50.43 | 42.97 | 31.93 | 22.73 | a | 39.49 | ||||||||||||
2017 | 22.13 | a | 29.18 | 33.97 | 35.90 | 43.84 | 58.27 | 60.42 | 57.77 | 50.37 | 41.00 | 35.50 | 22.45 | 40.90 | ||||||||||||
2018 | 23.18 | c | 25.57 | 28.81 | 34.93 | 45.84 | 58.33 | c | 60.26 | 58.65 | 52.77 | 41.87 | 27.95 | i | ----- | z | 43.02 | b | ||||||||
2019 | 21.17 | a | 18.00 | 30.65 | k | 40.40 | y | 38.55 | 53.40 | 60.55 | 60.87 | 52.30 | 35.23 | 30.87 | 21.45 | 39.24 | b | |||||||||
2020 | 23.19 | 22.93 | 31.12 | f | ----- | z | ----- | z | 54.18 | b | 60.65 | 62.23 | 52.50 | 43.45 | 31.97 | 21.06 | 41.35 | c | ||||||||
2021 | 22.36 | c | 22.39 | 27.90 | 37.38 | d | 37.74 | 58.93 | 61.35 | 58.71 | 55.97 | 37.94 | 36.37 | 24.45 | 40.12 | |||||||||||
2022 | 23.48 | 22.79 | 31.48 | 41.79 | f | 47.37 | a | 56.83 | 59.16 | 58.29 | 56.37 | 40.39 | 23.30 | 23.65 | 40.28 | a | ||||||||||
2023 | 19.10 | 17.61 | 24.16 | 33.93 | 44.61 | 49.40 | 62.29 | 57.23 | 50.37 | 41.97 | 31.24 | a | 26.16 | 38.17 | ||||||||||||
2024 | 20.97 | 24.17 | 27.94 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.36 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.66 | 23.20 | 27.93 | 34.02 | 42.85 | 52.88 | 58.45 | 56.89 | 50.68 | 40.28 | 29.25 | 21.95 | 38.38 | |||||||||||||
S.D. | 3.11 | 3.57 | 3.51 | 3.18 | 3.11 | 3.39 | 2.63 | 2.12 | 2.44 | 3.15 | 3.44 | 3.15 | 1.27 | |||||||||||||
SKEW | -0.05 | -0.19 | 0.07 | -0.30 | -0.10 | 0.06 | -2.08 | 0.19 | -0.57 | -0.34 | -0.10 | -0.16 | -0.23 | |||||||||||||
MAX | 27.52 | 32.39 | 35.71 | 39.80 | 48.44 | 60.69 | 62.90 | 62.23 | 56.37 | 46.43 | 36.37 | 28.80 | 40.90 | |||||||||||||
MIN | 13.57 | 14.18 | 20.15 | 26.20 | 34.55 | 44.80 | 44.04 | 52.23 | 44.14 | 31.25 | 21.17 | 12.76 | 35.33 | |||||||||||||
YRS | 73 | 77 | 74 | 75 | 79 | 81 | 82 | 82 | 78 | 77 | 75 | 71 | 50 |