YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.14 | b | 38.24 | 31.48 | 27.66 | 36.38 | h | |||
1960 | 21.37 | 16.12 | 29.74 | 38.33 | 43.55 | 54.27 | 56.13 | 58.76 | 51.55 | 40.81 | 33.38 | a | 23.94 | 39.00 | ||||||||||||
1961 | 24.19 | 25.29 | 28.73 | 33.53 | 44.71 | 52.38 | a | 55.19 | 54.69 | 46.36 | b | 41.48 | b | 28.52 | 20.56 | 37.97 | ||||||||||
1962 | 20.95 | a | 27.43 | 24.73 | 37.98 | 47.05 | a | 49.92 | 56.11 | 57.24 | 50.65 | 43.79 | 34.12 | 27.39 | 39.78 | |||||||||||
1963 | 18.90 | 26.20 | a | 27.40 | 39.18 | 48.24 | 54.22 | 59.45 | a | 55.35 | 51.75 | 45.74 | ----- | z | 22.85 | a | 40.85 | a | ||||||||
1964 | 19.95 | 16.10 | 23.39 | 34.33 | 45.06 | 52.42 | 60.00 | 55.20 | a | 49.23 | 41.63 | 29.97 | 24.65 | 37.66 | ||||||||||||
1965 | 26.03 | 22.71 | 21.05 | a | 37.83 | 44.66 | b | 48.76 | a | 52.66 | b | 49.53 | 41.96 | b | 40.16 | 32.92 | 26.37 | 37.05 | ||||||||
1966 | 18.00 | 16.68 | 29.77 | 34.17 | 45.08 | a | 51.79 | a | 58.52 | 52.98 | 48.18 | 38.27 | 30.87 | 21.85 | 37.18 | |||||||||||
1967 | 24.27 | 23.38 | 34.27 | 37.96 | b | 42.23 | 50.08 | 56.02 | 53.18 | 49.07 | 41.95 | a | 30.72 | 19.07 | a | 38.52 | ||||||||||
1968 | 19.74 | 19.16 | 22.45 | 26.12 | 40.00 | 53.98 | 55.56 | 53.10 | a | 47.60 | 41.06 | 24.55 | 21.53 | 35.41 | ||||||||||||
1969 | 26.13 | 23.18 | 17.25 | a | 36.63 | 44.37 | 47.22 | a | 56.84 | 55.87 | 47.32 | 31.03 | 25.00 | 21.79 | 36.05 | |||||||||||
1970 | 18.92 | 21.54 | 18.27 | 27.32 | 42.06 | 48.88 | 54.48 | 56.15 | a | 46.85 | 32.77 | 26.95 | 21.65 | 34.65 | ||||||||||||
1971 | 21.24 | 17.73 | 24.19 | 32.65 | 40.69 | 53.03 | 54.68 | a | 53.26 | 45.70 | 37.03 | a | 26.23 | 18.65 | 35.42 | |||||||||||
1972 | 21.27 | a | 22.53 | 30.53 | 34.80 | b | 42.13 | a | 52.22 | a | 54.66 | 53.35 | 48.85 | 39.10 | 18.25 | 18.05 | 36.31 | |||||||||
1973 | 17.42 | a | 17.62 | 20.27 | 25.16 | a | 39.48 | a | 51.07 | 54.35 | a | 56.37 | a | 47.05 | 39.82 | 28.25 | 20.85 | a | 34.81 | |||||||
1974 | 18.20 | a | 20.40 | b | 30.00 | a | 31.33 | 46.97 | 51.93 | 56.19 | 53.08 | a | 45.60 | a | 40.38 | a | 28.23 | 19.12 | a | 36.79 | ||||||
1975 | 23.25 | a | 21.34 | 27.39 | 34.10 | 40.39 | 49.22 | 54.87 | 54.17 | a | 45.79 | a | 40.58 | 27.58 | 23.37 | 36.84 | ||||||||||
1976 | 18.24 | 25.43 | 24.80 | a | 35.41 | a | 41.85 | a | 51.05 | a | 57.02 | 55.08 | 47.67 | 35.57 | a | 25.95 | a | 21.60 | 36.64 | |||||||
1977 | 19.06 | 23.18 | 25.71 | 34.87 | 46.20 | a | 55.28 | a | 57.74 | 55.82 | 50.52 | 38.65 | 29.73 | 27.23 | a | 38.67 | ||||||||||
1978 | 20.83 | a | 19.76 | c | 30.47 | b | 37.43 | a | 41.68 | 53.62 | a | 58.55 | b | 53.41 | c | 47.73 | d | 37.06 | d | 29.18 | b | 18.03 | a | 37.31 | ||
1979 | 13.52 | 22.27 | 25.32 | a | 33.38 | 38.38 | j | 50.22 | 55.30 | d | 53.59 | c | 49.37 | c | 39.69 | 19.48 | 23.10 | 35.02 | a | |||||||
1980 | 21.63 | 25.07 | 25.40 | 30.25 | 39.87 | ----- | z | 57.90 | b | 54.40 | a | ----- | z | 37.47 | 28.60 | a | 31.58 | a | 35.22 | b | ||||||
1981 | 21.77 | a | 24.71 | 23.65 | a | 39.38 | a | 40.78 | a | 55.40 | 57.19 | d | 52.43 | b | 48.72 | a | 36.93 | b | 31.10 | 22.08 | 37.85 | |||||
1982 | 19.44 | g | 16.08 | d | 25.37 | d | 32.22 | g | 38.95 | c | 46.16 | b | 46.44 | e | 54.43 | d | 48.60 | e | 36.48 | c | 26.61 | c | 23.48 | e | 36.26 | b |
1983 | 22.29 | 20.94 | a | 23.26 | d | 26.76 | c | 38.31 | b | 49.09 | a | 57.00 | e | 54.93 | d | 50.35 | c | 39.75 | i | 27.31 | a | 16.32 | a | 35.14 | a | |
1984 | 14.57 | b | 20.76 | 22.02 | 29.00 | 44.65 | 50.50 | a | 56.67 | g | 52.02 | d | 46.78 | a | 29.17 | a | 26.55 | 22.16 | 32.56 | a | ||||||
1985 | 12.82 | 13.59 | 24.27 | 34.02 | a | 41.97 | 49.32 | b | 53.38 | a | 51.84 | b | 41.28 | a | 34.12 | b | 22.04 | b | 17.57 | a | 33.02 | |||||
1986 | 23.76 | 21.05 | 28.32 | 33.23 | 38.13 | 50.29 | a | 57.00 | a | 54.37 | a | 48.95 | a | 36.82 | a | 27.38 | 18.52 | c | 36.49 | |||||||
1987 | 19.07 | a | 19.94 | c | 22.15 | a | 34.48 | a | 43.23 | 52.08 | 56.45 | a | 53.12 | b | 46.32 | 39.02 | a | 26.50 | 18.80 | a | 35.93 | |||||
1988 | 16.72 | b | 22.10 | 22.53 | 34.03 | a | 43.47 | 53.88 | b | 55.72 | b | 55.00 | 45.80 | 43.40 | b | 28.07 | 20.38 | a | 36.76 | |||||||
1989 | 19.18 | 17.24 | a | 32.37 | 35.42 | 43.83 | a | 46.33 | 54.77 | c | 51.04 | d | 45.92 | 36.65 | a | 29.90 | 18.28 | a | 35.91 | |||||||
1990 | 20.40 | 20.21 | 25.68 | 34.17 | 39.58 | 55.16 | a | 52.53 | a | 51.13 | 48.53 | 36.98 | 29.19 | a | 16.55 | 35.84 | ||||||||||
1991 | 16.56 | 23.64 | 25.68 | 32.33 | a | 42.66 | 50.52 | a | 52.66 | 54.53 | 46.34 | e | 42.66 | b | 24.54 | c | 20.11 | 36.02 | ||||||||
1992 | 20.32 | 22.71 | 26.56 | 36.55 | 44.40 | b | 48.17 | 52.77 | 50.93 | a | 48.54 | d | 40.97 | 21.62 | 18.16 | 35.97 | ||||||||||
1993 | 19.70 | a | 16.91 | a | 24.85 | a | 27.28 | a | 37.90 | 47.28 | a | 54.61 | 50.90 | a | 44.95 | a | 35.86 | b | 22.35 | c | 20.35 | a | 33.58 | |||
1994 | 17.41 | b | 17.74 | a | 25.72 | a | 28.64 | b | 39.75 | a | 52.95 | a | 52.27 | a | 52.98 | a | 46.62 | 34.30 | a | 24.75 | d | 22.93 | c | 34.67 | ||
1995 | 18.52 | a | 25.89 | 24.05 | 25.93 | b | 32.83 | a | 45.55 | a | 53.21 | 54.25 | e | 45.31 | a | 37.96 | c | 31.69 | a | 21.82 | 34.75 | |||||
1996 | 16.13 | p | 23.29 | c | 22.19 | g | 29.09 | c | 46.06 | e | 50.19 | f | 52.89 | 50.72 | a | 41.88 | b | 34.04 | d | 26.98 | f | 16.25 | i | 39.71 | e | |
1997 | 16.59 | c | 16.12 | d | 26.00 | g | 27.80 | g | 37.90 | b | 46.20 | b | 56.05 | c | 55.02 | 48.17 | 37.66 | b | 25.26 | g | 18.91 | b | 36.96 | c | ||
1998 | 18.10 | 15.16 | c | 23.69 | b | 29.17 | d | 47.52 | a | 53.67 | c | 58.08 | a | 55.14 | b | 54.07 | b | 42.02 | a | 33.29 | b | 27.16 | c | 38.09 | ||
1999 | 28.83 | b | 30.79 | 36.18 | 33.23 | b | 43.35 | a | 53.10 | a | 55.88 | e | 52.66 | 44.93 | b | 41.80 | c | 36.98 | b | 23.85 | d | 40.13 | ||||
2000 | ----- | z | 31.54 | d | 30.52 | c | 39.82 | b | 50.40 | a | 54.26 | c | 58.34 | b | 58.22 | a | 52.33 | a | 39.16 | c | 23.12 | e | 24.95 | 42.06 | a | |
2001 | 20.50 | d | 28.64 | 30.62 | b | 38.48 | 45.93 | b | 53.57 | b | 59.21 | b | 55.14 | c | 51.77 | b | 41.97 | b | 33.43 | 25.67 | a | 40.41 | ||||
2002 | 23.57 | a | ----- | z | 27.06 | 39.38 | d | 42.35 | e | 57.18 | b | 59.75 | a | 56.16 | c | 48.07 | 36.50 | 28.70 | 22.65 | 40.12 | a | |||||
2003 | 30.82 | 19.89 | 29.82 | 39.65 | d | 43.50 | c | 47.52 | f | 59.06 | 54.59 | c | 44.77 | 42.33 | b | 30.74 | g | 27.76 | f | 40.49 | c | |||||
2004 | 22.13 | d | 19.00 | b | 36.00 | 35.33 | g | 44.03 | 50.17 | a | 53.63 | 51.77 | c | 48.97 | a | 39.40 | e | 28.88 | a | 27.18 | f | 39.40 | b | |||
2005 | 27.81 | d | 26.92 | d | 29.33 | b | 38.12 | e | 45.87 | d | 51.66 | b | 59.73 | a | 54.29 | c | 52.46 | b | 41.07 | b | 33.33 | a | 23.24 | f | 41.87 | a |
2006 | 27.83 | b | 23.92 | c | 29.38 | a | 40.96 | d | 46.81 | e | 55.96 | d | 58.29 | b | 54.63 | a | 43.14 | b | 40.09 | c | 31.02 | d | 24.57 | b | 39.72 | |
2007 | 18.09 | b | 26.82 | 34.10 | a | 35.63 | d | 43.67 | a | 52.76 | c | 58.27 | a | 58.27 | a | 52.29 | d | 43.48 | d | 33.74 | c | 20.80 | c | 39.83 | ||
2008 | 18.27 | e | 24.58 | d | 26.80 | h | 31.38 | 42.24 | 52.82 | 59.11 | 57.05 | 48.40 | 41.21 | 33.43 | 23.02 | 39.23 | a | |||||||||
2009 | 27.68 | 28.20 | 32.62 | a | 35.83 | 47.16 | 52.88 | 57.74 | 55.61 | 45.47 | k | 35.44 | 33.67 | 19.48 | 38.76 | a | ||||||||||
2010 | 25.56 | 18.86 | 27.39 | 34.79 | b | 44.05 | 52.73 | 55.18 | 54.53 | 50.02 | 39.61 | 27.43 | 26.97 | 38.09 | ||||||||||||
2011 | 22.94 | 24.18 | 33.35 | 37.77 | 40.66 | 53.48 | 58.11 | 57.06 | 46.72 | 39.00 | 32.68 | 22.40 | 39.03 | |||||||||||||
2012 | 27.53 | 20.50 | 36.52 | 41.60 | 45.79 | 57.50 | 59.35 | 58.24 | 49.47 | 40.27 | 36.78 | 25.08 | 41.55 | |||||||||||||
2013 | 23.40 | 21.64 | 30.98 | 34.53 | 45.35 | 57.78 | 58.27 | 55.84 | 51.77 | 38.37 | a | 29.85 | 21.26 | 39.09 | ||||||||||||
2014 | 24.05 | 24.02 | 28.45 | 33.35 | 42.61 | 54.87 | 57.79 | 54.73 | 53.02 | 44.28 | a | 29.28 | 25.15 | 39.30 | ||||||||||||
2015 | 27.50 | 28.11 | 34.00 | 36.92 | 42.06 | 57.24 | k | 59.13 | 60.17 | a | 56.82 | 46.55 | 32.93 | 25.95 | 40.92 | a | ||||||||||
2016 | 24.45 | 31.43 | 34.15 | a | 37.67 | 43.31 | 58.60 | 61.73 | 55.76 | 53.37 | 47.24 | 36.22 | 26.16 | 42.51 | ||||||||||||
2017 | 24.82 | 33.11 | 38.58 | 38.30 | 44.10 | 56.00 | 58.92 | 55.26 | 52.32 | 43.15 | 41.15 | 30.85 | 43.05 | |||||||||||||
2018 | 28.79 | 29.20 | 33.37 | 38.42 | 49.85 | 58.32 | 60.00 | 56.74 | 54.65 | 40.02 | 27.88 | 22.84 | 41.67 | |||||||||||||
2019 | 23.21 | 23.62 | 26.81 | 37.08 | 39.34 | 52.37 | 59.39 | 60.37 | 56.47 | 32.45 | 28.98 | 23.05 | 38.59 | |||||||||||||
2020 | 22.19 | 17.57 | 30.45 | 33.42 | 44.84 | 54.15 | 57.77 | 58.13 | 48.19 | a | 40.97 | 31.12 | a | 20.69 | 38.29 | |||||||||||
2021 | 20.55 | 20.29 | 23.65 | 31.15 | 41.45 | 54.53 | 56.82 | 56.45 | 51.03 | 38.44 | 34.84 | a | 28.66 | 38.16 | ||||||||||||
2022 | 20.94 | 16.11 | 25.69 | 34.50 | 42.13 | 52.48 | 57.13 | 54.15 | 51.10 | 37.81 | 24.73 | 22.31 | b | 36.59 | ||||||||||||
2023 | 19.35 | 22.07 | 23.23 | 31.78 | 42.69 | 48.57 | 56.52 | 55.50 | 49.73 | 38.48 | 28.43 | 25.10 | 36.79 | |||||||||||||
2024 | 18.98 | 24.21 | 26.30 | c | 34.02 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.16 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.46 | 22.29 | 27.58 | 34.36 | 43.04 | 52.16 | 56.51 | 54.70 | 48.66 | 39.16 | 29.20 | 22.56 | 37.58 | |||||||||||||
S.D. | 3.91 | 4.42 | 4.64 | 4.02 | 3.14 | 3.12 | 2.60 | 2.26 | 3.27 | 3.51 | 4.35 | 3.40 | 2.22 | |||||||||||||
SKEW | 0.26 | 0.32 | 0.23 | -0.50 | -0.29 | -0.12 | -0.93 | 0.19 | 0.17 | -0.31 | -0.04 | 0.42 | 0.39 | |||||||||||||
MAX | 30.82 | 33.11 | 38.58 | 41.60 | 50.40 | 58.60 | 61.73 | 60.37 | 56.82 | 47.24 | 41.15 | 31.58 | 43.05 | |||||||||||||
MIN | 12.82 | 13.59 | 17.25 | 25.16 | 32.83 | 45.55 | 46.44 | 49.53 | 41.28 | 29.17 | 18.25 | 16.32 | 33.02 | |||||||||||||
YRS | 62 | 64 | 62 | 61 | 63 | 60 | 63 | 64 | 63 | 64 | 61 | 61 | 48 |