YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.57 | i | 57.08 | f | 55.26 | d | 44.11 | c | 38.72 | b | 24.64 | b | 19.54 | c | 36.45 | g |
1958 | 14.11 | d | 23.76 | c | 24.92 | e | 31.85 | d | 43.00 | g | 52.59 | h | 55.29 | j | 56.86 | j | 48.48 | i | 34.71 | j | 22.56 | l | 18.29 | j | 23.66 | h |
1959 | 13.14 | j | 16.84 | i | 22.14 | i | 32.00 | l | 42.00 | j | 52.32 | h | 55.14 | i | 55.45 | i | 46.09 | g | 35.65 | e | 23.40 | e | 18.41 | i | 29.53 | j |
1960 | 11.38 | j | 15.88 | c | 25.86 | b | 34.04 | f | 39.30 | k | 50.92 | f | 53.47 | l | 52.65 | h | 47.20 | j | 32.86 | j | 23.72 | l | 15.45 | k | 20.87 | j |
1961 | 9.10 | j | 17.37 | i | 24.74 | h | 29.85 | j | 39.86 | i | 50.26 | g | 54.24 | j | 52.74 | h | 41.89 | k | 29.64 | i | 22.20 | j | 10.00 | j | ----- | z |
1962 | 8.00 | i | 21.42 | i | 18.91 | i | 34.00 | i | 37.32 | i | 47.95 | i | 53.76 | j | 51.04 | h | 46.05 | j | 35.57 | h | 25.35 | g | 17.70 | k | ----- | z |
1963 | 8.45 | i | 19.00 | i | 21.52 | j | 32.14 | a | 43.42 | 48.40 | 59.00 | 56.21 | b | 49.95 | j | 39.35 | h | 24.72 | l | 13.90 | j | 47.83 | g | |||
1964 | 8.77 | i | 10.47 | j | 21.59 | i | 31.46 | b | 42.42 | 50.29 | b | 57.36 | f | 54.61 | h | 48.72 | e | 34.32 | i | 25.32 | k | 18.86 | i | 43.22 | h | |
1965 | 16.65 | k | 19.74 | i | 24.13 | h | 33.82 | h | 40.85 | d | 48.10 | 56.32 | 54.16 | 46.63 | 36.16 | 29.45 | a | 21.65 | e | 41.67 | d | |||||
1966 | 10.71 | j | 15.21 | i | 23.52 | h | 32.46 | b | 43.71 | 50.47 | 58.94 | 55.52 | 46.60 | 34.94 | 27.17 | 18.31 | e | 40.90 | c | |||||||
1967 | 13.56 | o | 19.84 | i | 27.09 | h | 33.39 | b | 39.90 | 50.30 | 58.48 | 52.81 | 47.53 | 35.90 | 26.47 | 15.89 | l | 43.10 | d | |||||||
1968 | 13.23 | i | 22.30 | i | 24.76 | j | 29.50 | 41.03 | 51.97 | 55.29 | 53.42 | 44.70 | 36.42 | 27.18 | b | 12.23 | i | 42.44 | d | |||||||
1969 | 20.14 | j | 22.00 | i | 19.52 | j | 34.38 | a | 43.74 | 46.67 | 56.13 | 55.52 | 43.83 | 32.59 | b | 21.41 | a | 16.32 | f | 41.78 | d | |||||
1970 | 10.45 | k | 14.89 | i | 22.68 | c | 26.03 | 39.42 | e | 46.70 | 52.35 | 51.58 | 41.03 | 29.48 | 23.50 | 11.54 | g | 36.98 | c | |||||||
1971 | 5.40 | k | 18.05 | i | 20.78 | h | 31.73 | d | 38.59 | b | 50.33 | 55.59 | d | 54.18 | c | 46.07 | c | 35.10 | 23.36 | e | 12.52 | j | 41.87 | d | ||
1972 | 13.80 | f | 20.69 | c | 29.00 | 33.55 | a | 41.77 | 51.40 | 58.10 | 56.03 | a | 49.10 | 41.33 | d | 23.58 | d | 14.07 | d | 38.06 | a | |||||
1973 | 10.93 | d | 19.67 | d | 27.52 | 29.77 | 41.13 | 50.60 | 57.58 | 56.16 | 46.80 | 37.39 | 27.25 | f | 17.95 | k | 37.75 | b | ||||||||
1974 | 15.40 | k | 14.39 | j | 28.90 | j | 32.45 | h | 44.66 | b | 52.50 | 56.42 | 53.23 | a | 47.00 | 40.32 | 27.00 | a | 15.67 | g | 45.88 | e | ||||
1975 | 12.50 | k | 18.95 | i | 28.45 | b | 30.70 | 39.65 | 48.97 | 57.16 | 53.87 | 47.33 | 34.03 | b | 23.82 | b | 18.15 | e | 38.21 | b | ||||||
1976 | 13.52 | j | 23.68 | j | 23.70 | h | 34.89 | c | 43.23 | 51.77 | 56.74 | 54.16 | 49.50 | b | 33.81 | j | 21.36 | e | 7.29 | 39.87 | d | |||||
1977 | 10.03 | 17.11 | 24.00 | 36.23 | 43.35 | 54.07 | 59.06 | 58.61 | 50.70 | 37.48 | 28.07 | 23.78 | d | 36.87 | ||||||||||||
1978 | 22.29 | j | 21.84 | i | 30.91 | h | 35.86 | b | 41.26 | 52.83 | 58.35 | 53.97 | 49.10 | 38.61 | 31.90 | 16.13 | 42.00 | c | ||||||||
1979 | 13.45 | 18.93 | 28.13 | 35.07 | 43.61 | 51.47 | 56.84 | 55.90 | 50.60 | 40.29 | 23.50 | b | 19.90 | 36.47 | ||||||||||||
1980 | 24.55 | 26.21 | 26.74 | 32.40 | 42.68 | 53.52 | a | 58.10 | 58.26 | 50.47 | 36.63 | a | 25.57 | 24.58 | g | 39.56 | a | |||||||||
1981 | 17.88 | g | 21.43 | e | 28.41 | d | 37.87 | 43.87 | a | 54.83 | 60.16 | 55.97 | 49.63 | 38.55 | 27.68 | b | 19.50 | k | 41.84 | b | ||||||
1982 | 17.18 | i | 16.95 | h | 27.14 | j | 33.62 | f | 42.21 | c | 50.07 | a | 58.45 | b | 58.87 | 50.42 | f | 33.95 | l | 25.29 | m | 19.89 | l | 52.40 | h | |
1983 | 19.19 | o | 23.25 | l | 28.68 | l | 31.21 | k | 40.04 | c | 47.36 | b | 53.84 | 54.35 | 45.46 | d | 33.32 | l | 22.53 | k | 16.52 | f | 48.21 | g | ||
1984 | 11.96 | f | 17.36 | d | 24.33 | d | 29.86 | a | 44.57 | a | 49.73 | 56.10 | 52.97 | b | 49.40 | 34.97 | 26.44 | c | 21.35 | e | 37.01 | a | ||||
1985 | 16.96 | d | 16.87 | e | 27.63 | d | 35.03 | 42.61 | 52.60 | 58.94 | 56.10 | 47.28 | a | 38.52 | 29.83 | 22.13 | 37.04 | |||||||||
1986 | 23.16 | 23.79 | 30.90 | 37.43 | 43.19 | 53.03 | 57.32 | 57.23 | 47.62 | a | 34.63 | a | 26.93 | b | 19.52 | 37.90 | ||||||||||
1987 | 15.29 | 23.07 | 24.84 | 33.20 | 42.94 | 53.10 | 58.52 | 56.58 | 48.37 | 39.58 | 26.73 | 18.65 | 36.74 | |||||||||||||
1988 | 9.48 | 22.28 | 25.23 | a | 35.63 | 44.77 | 56.24 | a | 57.74 | 58.00 | 47.43 | 39.97 | a | 25.70 | 15.52 | 36.50 | ||||||||||
1989 | 11.55 | 20.19 | b | 32.16 | 38.90 | a | 43.65 | 49.80 | 56.77 | 55.00 | 48.53 | 37.13 | 27.30 | 18.43 | a | 36.62 | ||||||||||
1990 | 14.48 | 19.11 | 30.80 | a | 37.40 | 44.00 | 55.69 | a | 57.65 | 55.23 | 51.60 | 38.19 | 29.67 | 10.12 | e | 36.99 | ||||||||||
1991 | 11.70 | a | 19.86 | 27.83 | a | 32.23 | 41.68 | 50.83 | 56.57 | a | 57.50 | a | 49.10 | 39.81 | 27.20 | 20.42 | 36.23 | |||||||||
1992 | 15.26 | d | 24.14 | 29.67 | a | 38.57 | 46.68 | 52.70 | 55.06 | 54.97 | 49.03 | 40.68 | 24.37 | 13.20 | f | 39.19 | a | |||||||||
1993 | 21.32 | c | 25.54 | b | 29.60 | a | 35.93 | a | 43.37 | a | 49.86 | b | 54.93 | c | 55.52 | 48.57 | 38.50 | a | 24.74 | c | 17.69 | e | 37.13 | |||
1994 | 18.44 | d | 17.72 | c | 30.65 | e | 37.00 | c | 45.90 | b | 57.14 | a | 60.14 | b | 58.55 | 49.52 | a | 37.50 | a | 26.04 | d | 20.45 | b | 38.25 | ||
1995 | 21.89 | c | 27.81 | b | 30.57 | a | 34.00 | c | 42.61 | 51.45 | a | 57.23 | a | 59.47 | a | 49.86 | a | 35.67 | a | 31.04 | b | 22.93 | b | 38.71 | ||
1996 | 18.64 | f | 25.36 | d | 28.43 | c | 34.48 | g | 49.03 | a | 55.73 | 60.68 | 59.24 | b | 49.10 | a | 38.84 | f | 30.74 | c | 21.93 | b | 42.25 | c | ||
1997 | 16.78 | d | 23.95 | f | 30.78 | d | 34.88 | d | 45.93 | c | 53.23 | 57.72 | b | 58.03 | b | 54.10 | 37.86 | b | 28.83 | a | 18.96 | f | 41.82 | b | ||
1998 | 22.24 | f | 22.43 | g | 29.70 | d | 33.35 | d | 45.18 | c | 54.11 | b | 59.74 | 59.00 | a | 54.07 | b | 39.46 | c | 32.31 | d | 20.76 | b | 42.77 | b | |
1999 | 23.77 | i | 25.61 | e | 32.11 | d | 34.15 | c | 42.90 | b | 51.64 | b | 60.40 | a | 57.57 | a | 49.36 | b | 37.31 | b | 29.77 | d | 16.81 | d | 39.78 | a |
2000 | 20.32 | i | 26.91 | g | 31.07 | d | 38.35 | d | 47.39 | c | 55.79 | a | 58.44 | d | 59.73 | a | 55.88 | v | 39.00 | b | 22.90 | a | 21.77 | e | 41.61 | c |
2001 | 14.70 | a | 21.86 | 31.13 | a | 38.14 | b | 48.57 | a | 54.93 | b | 60.87 | 57.60 | a | 50.90 | a | 39.35 | e | 34.27 | d | 19.04 | c | 39.28 | |||
2002 | 21.54 | e | 19.95 | f | 26.17 | h | 40.20 | j | 46.35 | e | 56.45 | a | 60.27 | a | 56.87 | 50.34 | a | 37.40 | a | 26.89 | b | 20.04 | c | 41.79 | c | |
2003 | 23.57 | a | 25.00 | 29.77 | 35.69 | d | 44.96 | e | 54.27 | d | 62.21 | b | 59.69 | b | 49.50 | 41.61 | 27.18 | b | 21.13 | 39.55 | ||||||
2004 | 18.14 | b | 18.55 | 34.47 | a | 37.18 | b | 46.80 | a | 53.66 | a | 56.71 | 57.55 | 48.76 | a | 37.30 | a | 29.28 | a | 18.66 | b | 38.09 | ||||
2005 | 26.13 | 26.89 | a | 29.67 | a | 35.93 | 46.53 | a | 55.41 | m | 60.66 | b | 58.16 | 52.45 | a | 41.24 | b | 30.00 | 18.38 | b | 38.73 | a | ||||
2006 | 19.17 | b | 20.00 | c | 29.07 | b | 37.87 | 48.57 | h | 57.11 | b | 61.04 | c | 58.97 | 47.79 | a | 39.80 | a | 27.76 | a | 19.90 | 38.04 | a | |||
2007 | 12.43 | a | 20.31 | b | 30.48 | f | 34.85 | d | 44.83 | a | 52.22 | c | 60.90 | b | 60.07 | c | 51.80 | 37.56 | d | 29.34 | a | 21.41 | b | 38.70 | a | |
2008 | 14.35 | 22.69 | c | 27.11 | d | 32.40 | e | 43.77 | a | 53.59 | c | 59.87 | 59.47 | a | 50.30 | 38.50 | c | 29.59 | a | 21.26 | 37.74 | |||||
2009 | 21.00 | b | 24.58 | b | 30.79 | b | 35.54 | d | 48.74 | 53.07 | 60.10 | 57.29 | 49.93 | 37.19 | 30.20 | 17.68 | 38.84 | |||||||||
2010 | 17.87 | 22.75 | 28.32 | 37.00 | 43.65 | 56.67 | 61.26 | 58.77 | 52.67 | 42.87 | 27.67 | 27.65 | 39.76 | |||||||||||||
2011 | 16.23 | 17.32 | 30.55 | 36.63 | 39.61 | 57.57 | 62.03 | 61.23 | 52.10 | 40.45 | 29.00 | 20.84 | 38.63 | |||||||||||||
2012 | 25.81 | 23.00 | 29.16 | 38.10 | 46.71 | 54.00 | 57.35 | 58.32 | 49.03 | 37.39 | 25.73 | 18.39 | 38.58 | |||||||||||||
2013 | 4.68 | 16.50 | 24.19 | 29.97 | 41.42 | 54.07 | 58.94 | 57.00 | 51.30 | 34.93 | a | 26.13 | 14.07 | a | 34.43 | |||||||||||
2014 | 14.07 | a | 23.96 | b | 28.84 | 34.43 | 42.45 | 53.30 | 59.16 | 55.90 | 53.80 | 40.10 | 25.68 | b | 23.04 | c | 37.89 | |||||||||
2015 | 19.07 | b | 24.75 | 29.58 | 35.57 | 41.87 | 55.83 | 58.03 | 57.23 | 53.07 | 42.61 | 26.93 | a | 20.32 | 38.74 | |||||||||||
2016 | 15.68 | 22.72 | 27.77 | 35.03 | 42.61 | 56.77 | 60.29 | 53.87 | 46.57 | 37.32 | 30.45 | a | 19.23 | 37.36 | ||||||||||||
2017 | 21.97 | 27.25 | 30.16 | 35.43 | 41.48 | 54.47 | 60.13 | 56.26 | 50.23 | 37.23 | 31.30 | 19.77 | 38.81 | |||||||||||||
2018 | 17.45 | 22.96 | 27.73 | a | 36.20 | 46.03 | 55.17 | 59.10 | 56.87 | 49.97 | 39.26 | 21.96 | d | 18.83 | b | 37.63 | ||||||||||
2019 | 16.44 | d | 19.19 | a | 29.14 | c | 36.81 | c | 40.40 | a | 50.70 | c | 57.97 | b | 56.67 | a | 51.52 | a | 31.58 | 22.17 | 17.71 | c | 35.86 | |||
2020 | 15.81 | 19.26 | b | 28.61 | c | 35.07 | b | 44.61 | 53.33 | 56.19 | 57.52 | 46.89 | b | 34.35 | 27.97 | 14.61 | 36.19 | |||||||||
2021 | 16.48 | 17.71 | 18.42 | 20.63 | 37.58 | 51.67 | 59.40 | a | 56.39 | m | 50.28 | a | 37.37 | a | 27.90 | 22.41 | b | 32.71 | a | |||||||
2022 | 16.90 | 13.39 | 26.39 | 35.30 | c | 45.40 | a | 54.63 | c | ----- | z | ----- | z | 51.07 | b | 38.81 | 23.08 | f | 18.07 | d | 33.33 | c | ||||
2023 | 17.90 | a | 17.41 | a | 24.25 | c | 28.07 | b | 43.00 | 50.55 | a | 60.70 | a | 58.17 | a | 50.03 | 38.35 | 24.43 | 18.55 | b | 35.95 | |||||
2024 | 18.07 | b | 20.79 | a | 28.14 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.33 | i |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.95 | 21.36 | 28.27 | 34.23 | 43.41 | 52.65 | 58.31 | 56.65 | 49.12 | 37.74 | 27.04 | 19.11 | 37.54 | |||||||||||||
S.D. | 4.61 | 3.46 | 2.84 | 3.37 | 2.51 | 2.70 | 2.05 | 2.12 | 2.55 | 2.59 | 2.92 | 3.39 | 1.27 | |||||||||||||
SKEW | -0.10 | -0.08 | -0.93 | -1.49 | 0.11 | -0.22 | -0.40 | -0.20 | -0.49 | -0.65 | 0.03 | -1.02 | -0.24 | |||||||||||||
MAX | 26.13 | 27.81 | 34.47 | 38.90 | 49.03 | 57.57 | 62.21 | 61.23 | 54.10 | 42.87 | 34.27 | 27.65 | 39.76 | |||||||||||||
MIN | 4.68 | 13.39 | 18.42 | 20.63 | 37.58 | 46.67 | 52.35 | 51.58 | 41.03 | 29.48 | 21.36 | 7.29 | 34.43 | |||||||||||||
YRS | 41 | 45 | 49 | 56 | 60 | 60 | 59 | 59 | 59 | 57 | 57 | 47 | 29 |