YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.22 | m | 58.87 | 58.52 | 57.67 | 54.00 | 57.26 | h | ||||
1979 | 52.10 | 54.11 | 51.74 | 54.20 | 54.81 | 55.90 | 56.42 | 57.65 | 57.90 | 58.97 | 55.53 | 55.10 | 55.37 | |||||||||||||
1980 | 53.03 | 54.86 | 55.35 | 54.40 | 56.68 | 56.80 | 58.16 | 57.81 | 59.10 | 57.23 | a | 55.42 | f | 56.10 | 56.32 | a | ||||||||||
1981 | 53.65 | 53.04 | 51.94 | 53.77 | 54.90 | a | 56.17 | 56.10 | 57.55 | 56.63 | 55.42 | 54.53 | 53.16 | 54.74 | ||||||||||||
1982 | 53.87 | 53.29 | 52.19 | 52.53 | 53.35 | 58.33 | ----- | z | 60.00 | 58.33 | 57.48 | 56.23 | 53.19 | 55.35 | a | |||||||||||
1983 | 52.52 | 52.00 | 52.23 | 52.47 | 53.19 | 55.50 | 55.84 | 56.39 | 57.33 | 56.03 | 55.60 | 55.16 | 54.52 | |||||||||||||
1984 | 54.06 | 52.03 | 53.94 | 53.87 | 55.06 | 55.60 | 56.48 | 57.13 | 57.00 | 57.81 | 56.75 | b | 53.00 | 55.23 | ||||||||||||
1985 | 52.43 | a | 53.46 | 52.03 | 52.37 | 53.71 | 55.00 | 58.10 | 58.00 | b | 57.27 | 56.83 | b | 55.63 | 53.94 | 54.90 | ||||||||||
1986 | 52.37 | a | 53.86 | 55.10 | 55.63 | 55.94 | 56.90 | 58.65 | 59.90 | 60.53 | 58.06 | 57.63 | 53.97 | 56.54 | ||||||||||||
1987 | 52.42 | 51.46 | 51.35 | 53.40 | 53.97 | 57.27 | 58.48 | 58.68 | 60.70 | 58.42 | 56.57 | 56.58 | 55.78 | |||||||||||||
1988 | 54.48 | 53.59 | 54.42 | 54.07 | 56.39 | 57.27 | 58.39 | 58.55 | 58.50 | 58.52 | 58.00 | 56.13 | 56.52 | |||||||||||||
1989 | 54.61 | 54.32 | 55.10 | 54.53 | 55.87 | 57.63 | 58.58 | 58.23 | 57.47 | 59.06 | 55.73 | 53.42 | 56.21 | |||||||||||||
1990 | 54.13 | 51.96 | 52.61 | 54.50 | 54.77 | 56.67 | 57.42 | 58.71 | 60.07 | 57.77 | 58.70 | 54.87 | 56.02 | |||||||||||||
1991 | 52.14 | j | 53.68 | i | 53.23 | 53.53 | 54.87 | 55.83 | 58.32 | 59.50 | a | 58.67 | 58.58 | 58.00 | 54.16 | 56.47 | b | |||||||||
1992 | 51.39 | 51.45 | 52.10 | 54.63 | 57.35 | 57.73 | 58.90 | 59.23 | 61.13 | 59.29 | 57.07 | 56.00 | 56.36 | |||||||||||||
1993 | 51.71 | 50.50 | 50.77 | 53.80 | 54.94 | 56.55 | a | 58.65 | 58.90 | 59.07 | 57.39 | 54.53 | 52.16 | 54.91 | ||||||||||||
1994 | 51.68 | 53.82 | 52.55 | 52.77 | 54.66 | b | 56.15 | d | 59.00 | b | 59.70 | a | 60.03 | a | 57.70 | a | 56.37 | c | 52.54 | c | 55.58 | |||||
1995 | 51.59 | d | 52.93 | 54.10 | a | 54.00 | 54.87 | 56.70 | 58.77 | 58.40 | a | 58.27 | 57.65 | 58.03 | 56.83 | b | 56.01 | |||||||||
1996 | 55.47 | a | 52.38 | 51.50 | c | 55.54 | b | 57.13 | 58.67 | 59.13 | 58.90 | 59.37 | 58.50 | a | 57.10 | 52.57 | a | 56.35 | ||||||||
1997 | 53.65 | 53.93 | a | 53.57 | a | 54.30 | 55.90 | 58.33 | 57.87 | a | 57.81 | 58.86 | a | 58.67 | a | 55.45 | a | 51.90 | 55.85 | |||||||
1998 | 52.26 | 51.59 | a | 52.90 | 53.03 | 53.39 | 55.57 | 55.35 | 57.52 | 56.50 | 56.58 | 55.63 | 54.14 | c | 54.54 | |||||||||||
1999 | 53.03 | a | 52.11 | a | 52.23 | 53.00 | 55.00 | 55.03 | 56.16 | 57.03 | b | 56.47 | 56.65 | 54.93 | 54.58 | 54.69 | ||||||||||
2000 | 50.77 | 52.31 | 52.87 | 52.76 | a | 54.52 | 55.63 | 57.77 | 57.81 | 58.10 | 57.58 | 56.07 | a | 53.87 | 55.01 | |||||||||||
2001 | 53.48 | 53.17 | e | 52.00 | 53.97 | 54.52 | 56.30 | 58.00 | 59.10 | 57.80 | 57.29 | 56.83 | 55.77 | 55.69 | ||||||||||||
2002 | 54.55 | 50.79 | 53.45 | 55.62 | a | 57.45 | 57.20 | 58.10 | 59.35 | 57.70 | 57.90 | 55.57 | 53.03 | 55.89 | ||||||||||||
2003 | 52.29 | 51.11 | 54.45 | 54.60 | 55.77 | 56.63 | 58.84 | 59.19 | 58.70 | 58.74 | 56.13 | 55.61 | 56.01 | |||||||||||||
2004 | 54.87 | 55.59 | 55.23 | a | 54.67 | 57.71 | 57.33 | 58.13 | 59.68 | 59.17 | 58.70 | a | 57.33 | 54.26 | 56.89 | |||||||||||
2005 | 55.35 | 52.54 | 52.94 | 54.60 | 56.52 | 57.77 | 58.06 | 57.29 | 59.30 | 57.00 | 57.00 | 53.61 | 56.00 | |||||||||||||
2006 | 53.48 | 51.96 | 56.68 | 53.50 | 54.29 | 56.03 | 57.16 | 58.48 | 58.10 | 58.65 | 56.93 | 53.45 | 55.73 | |||||||||||||
2007 | 53.71 | 52.21 | 54.45 | 53.10 | 55.03 | 56.73 | 58.00 | 58.23 | 58.30 | 56.94 | 56.47 | 55.86 | b | 55.75 | ||||||||||||
2008 | 51.55 | 52.97 | 53.71 | 54.73 | 55.00 | 56.43 | 58.06 | 57.61 | 57.47 | 57.23 | 56.03 | 55.29 | 55.51 | |||||||||||||
2009 | 52.65 | 51.43 | 52.16 | 53.50 | 56.71 | 57.63 | c | 58.81 | 58.97 | 58.00 | 59.74 | 56.10 | 53.68 | 55.78 | ||||||||||||
2010 | 53.97 | 51.64 | 52.55 | 53.43 | 55.39 | 56.03 | 56.52 | 56.74 | 56.73 | 57.03 | 55.93 | 55.39 | 55.11 | |||||||||||||
2011 | 53.10 | 54.75 | 54.52 | 55.27 | 56.68 | 56.47 | 56.55 | 57.13 | 56.73 | 56.26 | 55.57 | 53.55 | 55.55 | |||||||||||||
2012 | 53.39 | 52.57 | a | 53.00 | 53.23 | 54.10 | 55.53 | 56.19 | 57.29 | 56.67 | 57.10 | 54.73 | 54.55 | 54.86 | ||||||||||||
2013 | 52.77 | 50.32 | 51.32 | 53.69 | a | 56.35 | 56.76 | a | 57.97 | 57.03 | 58.23 | 58.16 | 56.58 | d | 55.03 | b | 55.35 | |||||||||
2014 | 52.74 | 55.46 | 53.94 | 54.33 | 56.35 | 56.31 | a | 58.45 | 58.42 | 59.58 | d | 59.42 | 56.53 | 52.67 | a | 56.18 | ||||||||||
2015 | 51.59 | b | 53.93 | 52.48 | 55.03 | 55.03 | b | 57.45 | a | 60.23 | 62.90 | 62.45 | a | 59.52 | 58.14 | a | 54.84 | 56.97 | ||||||||
2016 | 52.61 | 51.97 | 53.65 | 55.20 | 56.43 | a | 58.00 | a | 59.07 | a | 60.20 | a | 59.47 | 57.29 | 55.07 | a | 55.77 | a | 56.23 | |||||||
2017 | 51.19 | 52.28 | c | 54.97 | 55.00 | 55.58 | 57.80 | 58.87 | 58.90 | a | 58.40 | 58.07 | a | 55.57 | b | 52.71 | 55.78 | |||||||||
2018 | 52.65 | 54.57 | 54.32 | 57.07 | 56.94 | 57.30 | 59.26 | 60.33 | a | 59.82 | b | 59.33 | a | 55.97 | 54.06 | 56.80 | ||||||||||
2019 | 51.45 | 51.57 | 50.48 | 54.04 | b | 56.07 | a | 58.38 | a | 59.35 | 60.77 | 60.90 | a | 59.13 | 58.03 | a | 56.39 | 56.38 | ||||||||
2020 | 54.37 | a | 51.86 | 53.97 | 55.07 | a | 55.19 | 57.53 | 58.19 | 58.40 | a | 57.70 | 58.77 | 57.45 | a | 55.25 | c | 56.15 | ||||||||
2021 | 54.06 | m | 51.78 | j | 53.53 | l | 52.43 | i | 54.85 | k | 55.90 | i | 57.70 | k | 56.95 | k | 57.10 | j | 55.68 | l | 56.00 | m | 54.95 | l | ----- | z |
2022 | 53.44 | m | 51.44 | j | 53.48 | j | 54.65 | j | 55.05 | j | 54.76 | i | 57.10 | k | 57.62 | j | 57.76 | i | 58.29 | j | 56.00 | l | 55.05 | l | ----- | z |
2023 | 52.10 | k | 53.79 | i | 55.50 | i | 55.32 | k | 55.00 | i | 56.33 | i | 57.15 | k | 57.50 | i | 57.32 | k | 56.95 | i | 56.21 | k | 53.68 | l | ----- | z |
2024 | 53.40 | k | 51.35 | i | 52.67 | m | 53.85 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 53.00 | 52.72 | 53.19 | 54.11 | 55.44 | 56.78 | 57.96 | 58.56 | 58.54 | 57.93 | 56.42 | 54.38 | 55.74 | |||||||||||||
S.D. | 1.19 | 1.32 | 1.39 | 1.00 | 1.17 | 0.95 | 1.11 | 1.26 | 1.38 | 1.02 | 1.06 | 1.29 | 0.66 | |||||||||||||
SKEW | 0.20 | 0.36 | 0.24 | 0.42 | 0.02 | 0.06 | -0.61 | 0.92 | 0.60 | -0.26 | 0.20 | 0.04 | -0.15 | |||||||||||||
MAX | 55.47 | 55.59 | 56.68 | 57.07 | 57.71 | 58.67 | 60.23 | 62.90 | 62.45 | 59.74 | 58.70 | 56.83 | 56.97 | |||||||||||||
MIN | 50.77 | 50.32 | 50.48 | 52.37 | 53.19 | 55.00 | 55.35 | 56.39 | 56.47 | 55.42 | 54.53 | 51.90 | 54.52 | |||||||||||||
YRS | 41 | 41 | 42 | 42 | 42 | 42 | 41 | 42 | 43 | 43 | 42 | 43 | 39 |