YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1968 | 24.03 | 23.55 | 26.87 | 29.16 | a | 40.56 | 53.53 | 55.66 | 52.74 | 46.35 | 41.60 | 26.12 | 21.08 | 36.77 | ||||||||||||
1969 | 24.63 | 21.18 | 20.33 | a | 36.00 | 44.97 | 46.58 | 58.00 | 57.22 | a | 49.53 | 31.39 | 27.47 | 22.87 | 36.68 | |||||||||||
1970 | 19.69 | 24.30 | 20.42 | 27.43 | 43.68 | 50.00 | 55.98 | a | 56.94 | 46.90 | a | 34.32 | 28.38 | 23.29 | 35.94 | |||||||||||
1971 | 20.69 | 18.66 | 24.52 | 33.32 | 40.50 | 52.42 | 55.37 | 54.39 | 45.50 | 37.92 | 28.30 | 21.06 | 36.05 | |||||||||||||
1972 | 20.11 | 22.59 | 31.06 | 35.03 | 41.58 | 52.18 | 55.87 | 53.40 | 48.95 | 40.02 | 22.67 | 20.73 | 37.02 | |||||||||||||
1973 | 21.10 | 22.27 | 22.44 | 27.28 | 40.08 | a | 51.12 | 54.27 | 55.84 | 47.67 | 42.34 | 30.63 | 22.71 | 36.48 | ||||||||||||
1974 | 20.35 | a | 21.79 | 30.25 | a | 32.10 | a | 46.53 | 52.30 | 56.24 | j | 52.40 | 45.80 | 41.16 | 24.62 | 19.07 | b | 35.12 | a | |||||||
1975 | 18.93 | a | 17.55 | 23.45 | a | 29.07 | a | 39.33 | a | 47.97 | 55.13 | 54.95 | 47.12 | a | 40.56 | 26.09 | a | 25.23 | 35.45 | |||||||
1976 | 18.60 | 25.91 | 22.56 | 33.98 | a | 42.18 | 51.12 | a | 56.92 | 53.90 | 47.40 | 36.61 | 27.20 | 23.40 | a | 36.65 | ||||||||||
1977 | 19.44 | 24.11 | 24.62 | a | 35.29 | a | 44.97 | a | 55.58 | 56.98 | 55.89 | 52.08 | 41.15 | 30.45 | a | 24.24 | 38.73 | |||||||||
1978 | 21.21 | b | 21.95 | 29.61 | 36.82 | 39.66 | 52.18 | 57.97 | 53.44 | 50.57 | 42.52 | 26.87 | 17.81 | d | 37.55 | |||||||||||
1979 | 13.03 | b | 22.00 | a | 24.27 | a | 34.32 | 40.34 | 51.29 | a | 57.72 | a | 54.13 | 51.79 | a | 42.26 | b | 20.02 | b | 25.71 | 36.41 | |||||
1980 | 20.10 | 26.05 | 24.56 | 30.30 | 40.55 | 55.30 | 59.56 | 56.85 | a | 50.58 | 38.92 | 30.97 | a | 32.07 | b | 38.82 | ||||||||||
1981 | 25.76 | 26.20 | a | 26.05 | 35.21 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.75 | u | 32.09 | a | 24.77 | a | 26.97 | g | ||
1982 | 18.77 | e | 19.64 | c | 27.14 | c | 31.21 | a | 40.13 | 48.20 | c | 55.21 | 55.55 | b | 47.95 | a | 37.07 | b | 27.47 | 22.20 | d | 35.88 | ||||
1983 | 25.00 | c | 23.77 | 25.24 | b | 25.88 | b | 37.30 | f | 49.33 | d | 57.48 | a | 55.92 | 51.85 | 39.82 | c | 26.85 | 17.29 | e | 36.22 | a | ||||
1984 | 21.67 | e | 21.77 | e | 22.58 | e | 27.10 | 43.64 | b | 49.65 | 56.06 | 54.47 | a | 47.80 | b | 31.84 | b | 28.67 | 24.10 | 35.78 | ||||||
1985 | 18.12 | a | 18.43 | 26.02 | 35.31 | a | 42.87 | 51.82 | 54.48 | 55.71 | 44.72 | c | 38.05 | b | 25.46 | b | 23.03 | 36.17 | ||||||||
1986 | 27.50 | a | 21.04 | d | 30.33 | b | 33.07 | 40.73 | a | 51.21 | b | 54.40 | a | 53.74 | 45.53 | a | 35.74 | 28.30 | c | 21.69 | 36.94 | |||||
1987 | 19.77 | c | 22.05 | 23.80 | a | 35.52 | a | 41.92 | a | 52.07 | a | 55.82 | a | 53.10 | b | 46.33 | 40.22 | a | 27.83 | a | ----- | z | 38.04 | a | ||
1988 | 16.54 | c | 23.38 | a | 21.31 | b | 34.03 | 41.40 | b | 53.19 | a | 55.25 | a | 55.33 | a | 46.15 | 42.39 | c | 24.88 | a | 20.43 | a | 36.19 | |||
1989 | 21.52 | a | 20.13 | a | 30.95 | b | 33.90 | a | 42.06 | 46.90 | 56.26 | 52.07 | a | 46.85 | 36.98 | 27.48 | b | 18.52 | 36.13 | |||||||
1990 | 18.86 | b | 19.72 | a | 25.34 | 32.65 | 38.10 | 53.25 | 52.74 | 51.79 | 49.23 | 36.79 | 28.88 | a | 17.62 | b | 35.41 | |||||||||
1991 | 17.23 | c | 23.64 | 21.90 | 28.63 | 41.03 | a | 49.29 | a | 52.66 | 52.10 | 45.55 | a | 37.98 | a | 22.64 | a | 22.22 | a | 34.57 | ||||||
1992 | 19.61 | c | 21.47 | 26.77 | a | 36.00 | b | 41.90 | f | 46.45 | 51.86 | b | 50.73 | a | 46.91 | a | 40.35 | 21.20 | c | 18.98 | a | 34.58 | a | |||
1993 | 20.28 | a | 19.11 | 26.07 | a | 29.00 | 40.10 | b | 46.94 | c | 53.28 | d | 51.75 | a | 44.46 | b | 35.94 | d | 25.16 | e | 21.95 | c | 34.50 | |||
1994 | 19.96 | c | 19.23 | b | 25.80 | c | 31.28 | c | 42.28 | b | 52.60 | 53.23 | a | 53.52 | a | 46.28 | 34.75 | a | 23.96 | f | 25.20 | d | 36.74 | a | ||
1995 | 18.77 | a | 23.30 | a | 25.37 | 26.60 | e | 33.00 | b | 44.85 | 50.95 | a | 54.50 | a | 46.02 | c | 34.30 | a | 28.98 | a | 20.55 | 33.93 | ||||
1996 | 15.64 | c | 20.21 | a | 22.60 | a | 28.14 | a | 41.93 | c | 48.60 | a | 54.35 | 52.24 | 43.60 | a | 36.43 | b | 26.50 | a | 19.27 | a | 34.13 | |||
1997 | 19.19 | b | 17.33 | b | 26.84 | b | 24.14 | a | 37.42 | a | 47.83 | a | 52.27 | 49.81 | b | 46.85 | 33.92 | a | 21.91 | c | 16.43 | d | 32.83 | |||
1998 | 19.57 | d | 17.77 | 23.40 | g | 28.27 | b | ----- | z | 48.82 | 56.68 | 54.05 | 51.55 | b | 38.18 | c | 30.37 | c | 22.27 | c | 36.75 | b | ||||
1999 | 21.25 | e | 25.05 | f | 30.28 | a | 27.71 | b | 38.50 | 49.65 | d | 56.43 | b | 53.63 | a | 46.72 | a | 40.38 | a | 36.02 | 22.31 | d | 38.45 | a | ||
2000 | 23.57 | d | 27.28 | d | 27.81 | d | 35.62 | n | 45.74 | b | 53.50 | a | 58.75 | a | 57.77 | 51.22 | 40.85 | 21.61 | b | 22.22 | b | 39.12 | a | |||
2001 | 21.76 | d | 23.91 | a | 27.60 | a | 37.61 | c | 44.79 | b | 54.83 | 58.87 | a | 55.85 | 50.57 | 40.97 | a | 32.92 | 22.37 | 39.34 | ||||||
2002 | 21.45 | 21.92 | d | 25.17 | a | 39.37 | 44.26 | d | 56.73 | 59.85 | a | 56.60 | 49.33 | 36.74 | 26.90 | a | 22.63 | 38.41 | ||||||||
2003 | 25.75 | m | 19.00 | 27.00 | 33.88 | a | 44.29 | 49.69 | a | 61.41 | c | 57.08 | 48.00 | e | 44.86 | b | 29.02 | b | 25.83 | d | 40.01 | a | ||||
2004 | 23.32 | a | 19.88 | d | 32.84 | c | 33.18 | 44.05 | 49.70 | b | 54.63 | 52.77 | a | 47.57 | 38.56 | 27.00 | 23.75 | a | 37.27 | |||||||
2005 | 26.30 | a | 22.70 | 24.32 | 33.73 | 42.66 | 49.60 | 58.66 | 53.48 | 50.83 | 40.79 | 30.17 | 20.79 | 37.84 | ||||||||||||
2006 | 23.39 | 20.05 | 25.63 | 36.42 | 44.17 | a | 55.02 | 57.11 | 54.60 | 44.57 | 36.40 | 28.90 | 21.97 | 37.35 | ||||||||||||
2007 | 19.78 | a | 22.26 | c | 30.68 | 32.37 | 42.68 | 52.30 | 58.35 | 57.31 | 49.91 | a | 40.06 | 33.30 | 18.24 | 38.10 | ||||||||||
2008 | 16.08 | 19.68 | a | 22.73 | 29.23 | 39.53 | 50.90 | a | 57.65 | 54.90 | 48.80 | 39.56 | 31.82 | 19.85 | 35.89 | |||||||||||
2009 | 24.26 | 24.41 | 27.95 | 30.12 | 43.85 | a | 49.50 | 56.66 | 54.45 | 47.53 | 33.05 | 32.07 | 15.93 | a | 36.65 | |||||||||||
2010 | 21.69 | 16.34 | 24.34 | 32.83 | 38.40 | 53.32 | 57.29 | 55.66 | 52.53 | 40.16 | 26.98 | 26.66 | 37.18 | |||||||||||||
2011 | 19.90 | 16.82 | 28.71 | 31.67 | 37.26 | 52.70 | 58.65 | 57.98 | 48.32 | 38.82 | 28.38 | 21.45 | 36.72 | |||||||||||||
2012 | 24.10 | 18.38 | 31.75 | a | 38.97 | 43.76 | 56.80 | 58.65 | 56.81 | 49.83 | 38.76 | 33.85 | 21.89 | 39.46 | ||||||||||||
2013 | 20.55 | 17.71 | 25.42 | 27.77 | 40.74 | 54.80 | 56.90 | 55.94 | 50.93 | 36.94 | 29.55 | 19.56 | 36.40 | |||||||||||||
2014 | 22.31 | 20.45 | 26.81 | 31.13 | 40.37 | 51.57 | 57.23 | 53.21 | 51.32 | 42.27 | 27.68 | 23.26 | 37.30 | |||||||||||||
2015 | 25.08 | 24.82 | 31.27 | 34.62 | 39.37 | 55.00 | 55.71 | 56.65 | 53.30 | 43.19 | 27.13 | 20.23 | 38.86 | |||||||||||||
2016 | 21.48 | 25.83 | 26.85 | 32.35 | 39.31 | 56.25 | 59.29 | 53.76 | 50.07 | 43.85 | 34.62 | 21.45 | 38.76 | |||||||||||||
2017 | 19.08 | 28.20 | c | 33.92 | 33.60 | 40.84 | 54.47 | 57.02 | 54.24 | 49.97 | 39.34 | 35.85 | 26.63 | 39.43 | ||||||||||||
2018 | 26.31 | 22.32 | 28.23 | 34.18 | 45.61 | 56.15 | 58.93 | i | 56.97 | m | 53.07 | b | 37.03 | a | 24.18 | 21.53 | 34.86 | b | ||||||||
2019 | 21.00 | a | 20.32 | 25.47 | 34.88 | 37.72 | a | 49.73 | 57.85 | 57.48 | 53.57 | 33.15 | 30.30 | 22.87 | 37.03 | |||||||||||
2020 | 22.18 | 18.14 | 29.40 | 32.57 | 44.97 | a | 52.48 | 57.10 | 58.81 | 49.07 | 41.11 | 30.20 | 21.87 | 38.16 | ||||||||||||
2021 | 21.21 | 19.09 | 23.84 | 30.42 | 41.39 | 54.75 | 57.42 | 55.71 | 53.48 | 39.13 | 34.87 | 27.76 | 38.25 | |||||||||||||
2022 | 21.84 | 17.29 | 26.03 | 32.02 | 42.21 | 53.00 | 58.84 | 56.29 | 52.34 | a | 39.71 | 26.90 | a | 24.27 | 37.56 | |||||||||||
2023 | 21.95 | 22.55 | 23.05 | 31.53 | 43.98 | 49.28 | 58.87 | 56.55 | 50.13 | 39.48 | 29.17 | 22.79 | 37.45 | |||||||||||||
2024 | 18.03 | 22.48 | 24.60 | 30.79 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.70 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.96 | 21.46 | 26.26 | 32.09 | 41.58 | 51.53 | 56.45 | 54.74 | 48.74 | 38.67 | 28.25 | 22.07 | 36.85 | |||||||||||||
S.D. | 2.82 | 2.82 | 3.16 | 3.42 | 2.64 | 2.90 | 2.22 | 1.98 | 2.62 | 3.06 | 3.63 | 2.93 | 1.50 | |||||||||||||
SKEW | 0.00 | 0.25 | 0.36 | -0.14 | -0.51 | -0.11 | -0.41 | -0.20 | 0.09 | -0.41 | 0.02 | 0.51 | -0.37 | |||||||||||||
MAX | 27.50 | 28.20 | 33.92 | 39.37 | 46.53 | 56.80 | 61.41 | 58.81 | 53.57 | 44.86 | 36.02 | 32.07 | 39.46 | |||||||||||||
MIN | 13.03 | 16.34 | 20.33 | 24.14 | 33.00 | 44.85 | 50.95 | 49.81 | 43.60 | 31.39 | 20.02 | 15.93 | 32.83 | |||||||||||||
YRS | 56 | 56 | 56 | 54 | 52 | 55 | 53 | 54 | 55 | 55 | 55 | 55 | 45 |