YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.20 | g | 24.60 | 24.60 | k | |
1969 | 28.02 | 22.38 | ----- | z | 36.69 | a | 45.00 | 49.38 | 59.42 | 62.21 | 55.00 | a | 39.84 | 35.37 | 30.79 | 42.19 | a | |||||||||
1970 | 30.05 | 32.12 | 31.81 | 31.57 | 46.19 | 53.55 | 61.50 | 60.11 | 51.10 | 43.58 | 36.48 | 23.08 | 41.76 | |||||||||||||
1971 | 26.66 | 28.55 | 32.21 | 34.17 | 40.31 | 50.26 | g | 61.26 | 61.68 | 52.30 | 38.55 | 30.95 | 18.94 | 38.69 | a | |||||||||||
1972 | 24.94 | 30.22 | 38.18 | 37.50 | 45.71 | 54.98 | f | ----- | z | 59.57 | q | 47.18 | h | 39.28 | b | 28.47 | a | 21.73 | 33.25 | d | ||||||
1973 | 21.58 | a | 27.00 | 24.84 | 34.92 | 46.13 | 55.10 | 59.74 | 58.69 | 51.83 | 43.45 | 30.92 | 28.90 | 40.26 | ||||||||||||
1974 | 24.98 | 28.32 | 33.42 | 34.88 | 46.02 | 56.08 | 59.85 | 58.29 | 57.08 | 43.85 | 34.25 | 25.47 | 41.88 | |||||||||||||
1975 | 26.63 | 26.48 | a | 28.15 | 27.28 | 42.31 | 52.85 | 58.15 | 55.68 | 55.33 | 41.16 | 33.73 | 28.98 | 39.73 | ||||||||||||
1976 | 29.94 | 29.76 | 29.79 | 33.93 | 47.98 | 51.68 | 59.60 | 52.29 | 52.12 | 43.92 | 38.65 | 31.29 | 41.75 | |||||||||||||
1977 | 26.29 | 33.70 | 27.60 | 40.92 | 37.00 | 56.03 | 59.24 | 60.03 | 50.93 | 45.97 | 36.45 | a | 33.61 | 42.31 | ||||||||||||
1978 | 27.22 | a | 26.52 | 30.82 | 34.27 | 42.65 | 52.00 | 57.29 | 58.11 | 49.48 | 48.02 | 30.08 | 22.31 | 39.90 | ||||||||||||
1979 | 22.52 | 24.54 | 29.88 | b | 35.40 | ----- | z | 53.09 | a | 58.88 | a | 54.38 | a | 53.98 | 43.69 | 33.03 | a | 31.10 | 40.04 | a | ||||||
1980 | 29.58 | a | 31.28 | 28.74 | 37.12 | 39.47 | 48.34 | a | 58.45 | 56.16 | b | 50.82 | 44.56 | 36.20 | 31.63 | 41.03 | ||||||||||
1981 | 29.83 | a | 30.62 | 31.24 | 40.45 | 44.66 | 57.62 | 59.77 | 61.15 | 54.38 | a | 38.85 | a | 35.05 | 31.24 | 42.91 | ||||||||||
1982 | 23.11 | 30.59 | a | 29.78 | a | 35.31 | a | 45.24 | 50.50 | 57.18 | 56.50 | p | 46.71 | r | 41.37 | 31.03 | 26.27 | a | 37.04 | b | ||||||
1983 | 27.09 | c | 30.06 | a | 31.38 | c | 31.42 | 41.34 | 49.55 | 55.15 | 56.98 | b | 54.98 | a | 44.03 | a | 32.67 | a | 29.54 | e | 40.35 | |||||
1984 | 29.50 | a | 29.38 | d | 36.05 | 35.20 | 50.43 | a | 51.91 | b | 62.16 | b | 60.50 | 56.17 | 38.62 | a | 30.40 | a | 21.68 | 41.83 | ||||||
1985 | 24.90 | a | 28.30 | a | 28.97 | a | 41.30 | 45.31 | 56.95 | 62.74 | 58.06 | 47.41 | a | 43.09 | b | 31.63 | d | 27.70 | d | 41.36 | ||||||
1986 | 34.05 | 31.90 | d | 36.22 | b | 38.38 | a | 45.03 | 55.18 | 57.47 | 61.29 | 46.13 | c | 42.04 | c | 35.88 | a | 29.86 | c | 42.79 | ||||||
1987 | 24.96 | f | 26.76 | g | 31.79 | c | 43.70 | b | 46.17 | a | 55.62 | 55.40 | b | 60.15 | a | 54.07 | a | 48.05 | c | 33.98 | g | 23.00 | g | 49.37 | d | |
1988 | 27.83 | j | 33.22 | f | 35.00 | b | 39.16 | a | 44.03 | 53.12 | 62.42 | 60.21 | 53.63 | 49.65 | 33.25 | d | 25.19 | d | 45.56 | b | ||||||
1989 | 22.29 | c | 25.42 | c | 35.68 | a | 43.97 | 44.90 | 54.05 | 60.81 | 56.55 | a | 51.55 | 42.68 | a | 37.11 | b | 30.98 | a | 42.17 | ||||||
1990 | 25.19 | b | 25.62 | d | 34.39 | d | 42.07 | b | 44.37 | 53.38 | 61.95 | a | 57.83 | a | 52.75 | 47.23 | a | 35.62 | 23.22 | b | 41.97 | |||||
1991 | 29.19 | 36.12 | c | 26.48 | c | 35.45 | 41.33 | a | 50.93 | 61.55 | 58.56 | 57.03 | 48.66 | 36.77 | 30.50 | 42.72 | ||||||||||
1992 | 27.55 | 32.59 | 34.47 | 43.53 | 51.77 | 53.35 | 57.55 | 61.86 | b | ----- | z | 47.42 | 35.43 | 22.03 | 42.51 | a | ||||||||||
1993 | 26.29 | c | 26.54 | a | 35.95 | a | 37.74 | a | 45.53 | 51.32 | 56.89 | 57.22 | b | 52.64 | a | 44.17 | b | 34.02 | a | 25.10 | 41.12 | |||||
1994 | 29.47 | 25.31 | b | 36.64 | b | 38.86 | b | 44.76 | 55.62 | a | 62.38 | a | 61.33 | a | 53.18 | b | 41.95 | a | 26.37 | 25.34 | 41.77 | |||||
1995 | 27.48 | c | 36.89 | a | 32.98 | d | 35.47 | a | 40.76 | 49.33 | 59.15 | 59.58 | 55.47 | 48.31 | 41.58 | 30.34 | 43.11 | |||||||||
1996 | 29.41 | b | 31.26 | b | 34.48 | 40.10 | 46.65 | a | 55.17 | a | 62.67 | a | 61.87 | 53.03 | 44.33 | b | 33.60 | 29.66 | 43.52 | |||||||
1997 | 28.83 | a | 30.04 | 38.63 | 38.19 | a | 51.18 | a | 52.77 | 57.92 | 59.26 | 54.52 | 43.24 | 34.22 | a | 23.53 | a | 42.69 | ||||||||
1998 | 27.60 | a | 24.19 | d | 32.67 | a | 32.10 | a | 36.50 | a | 46.97 | 59.37 | 61.20 | a | 51.77 | b | 41.02 | c | 33.86 | b | 26.24 | b | 39.46 | |||
1999 | 30.35 | a | 30.02 | a | 32.52 | b | 32.55 | a | 45.27 | 51.57 | 58.63 | 57.29 | 56.39 | c | 49.07 | a | 39.70 | c | 30.89 | 42.85 | ||||||
2000 | 30.71 | 29.26 | 33.67 | b | 40.53 | 48.60 | 57.58 | d | 57.95 | 59.77 | a | 52.12 | 42.71 | b | 29.48 | 32.71 | 42.92 | |||||||||
2001 | 24.11 | 25.05 | 34.57 | a | 33.60 | 53.17 | a | 56.56 | c | 58.58 | a | 61.62 | f | 56.60 | 49.80 | a | 35.69 | c | 23.10 | b | 40.98 | a | ||||
2002 | 26.26 | b | 32.73 | b | 31.45 | 39.80 | 44.64 | b | 56.02 | a | 63.29 | b | 57.71 | g | 54.78 | a | 42.87 | a | 37.15 | 26.34 | 41.39 | a | ||||
2003 | 32.13 | a | 30.09 | 33.94 | 32.97 | a | 45.52 | 55.66 | a | 62.95 | c | 59.23 | c | 58.14 | a | 50.85 | 30.14 | b | 27.48 | c | 43.26 | |||||
2004 | 26.05 | 25.52 | c | 39.32 | a | 40.77 | 46.38 | a | 55.69 | a | 61.07 | a | 60.26 | 52.64 | b | 40.70 | c | 32.57 | b | 27.50 | a | 42.37 | ||||
2005 | 26.64 | b | 30.46 | a | 34.15 | 36.36 | a | 44.91 | b | 49.93 | c | 64.40 | g | 61.06 | g | 49.59 | a | 43.81 | 38.47 | 32.38 | e | 38.67 | b | |||
2006 | 27.79 | c | 30.09 | a | 25.32 | a | 35.78 | 47.67 | b | 57.21 | d | 63.81 | b | 58.66 | b | 53.72 | c | 41.83 | d | 36.05 | a | 26.53 | 42.04 | |||
2007 | 22.72 | a | 29.41 | 36.83 | a | 39.40 | a | 47.92 | a | 56.19 | i | 62.07 | d | 62.12 | b | 52.80 | c | 43.42 | a | 39.35 | 23.69 | b | 41.79 | a | ||
2008 | 25.48 | e | 28.96 | a | 34.00 | b | 38.62 | d | 45.48 | e | 55.54 | c | 61.85 | 61.74 | b | 55.67 | c | 45.76 | 37.28 | a | 26.56 | g | 44.58 | a | ||
2009 | 29.94 | f | 27.07 | 31.55 | 36.88 | d | 51.30 | a | 50.69 | a | 62.08 | 59.02 | 57.89 | c | 42.07 | c | 35.84 | b | 24.90 | 43.57 | a | |||||
2010 | 28.07 | b | 29.09 | a | 32.02 | a | 33.09 | b | 39.97 | b | 52.46 | d | 60.84 | b | 59.27 | e | 54.85 | c | 46.12 | b | 31.76 | c | 28.50 | a | 41.34 | |
2011 | 29.03 | 25.54 | 32.29 | 36.86 | a | 40.25 | i | 50.69 | d | 57.97 | a | 59.22 | b | 56.11 | g | 46.44 | g | 31.67 | c | 28.74 | d | 39.11 | c | |||
2012 | 32.00 | b | 29.33 | b | 34.15 | e | 39.27 | 48.33 | d | 54.21 | a | 59.34 | c | 63.25 | e | 58.10 | i | 45.88 | g | 37.65 | j | 25.87 | a | 42.86 | c | |
2013 | 23.69 | 26.57 | a | 36.71 | b | 41.80 | b | 47.13 | a | 56.57 | 63.77 | 59.18 | a | 54.21 | a | 41.73 | e | 36.41 | b | 26.87 | a | 42.89 | ||||
2014 | 35.22 | a | 32.09 | 36.33 | d | 40.28 | e | 46.95 | a | 54.90 | a | 63.15 | d | 58.02 | 55.55 | b | 48.29 | 36.05 | a | 29.12 | b | 44.66 | ||||
2015 | 32.43 | a | 37.93 | a | 39.24 | 38.33 | i | 43.76 | f | 56.84 | b | 58.59 | o | 61.45 | u | 55.58 | d | 46.93 | a | 28.55 | a | 23.33 | e | 40.10 | d | |
2016 | 26.90 | f | 32.77 | a | 35.02 | 40.71 | b | 44.65 | a | 56.83 | d | 61.58 | f | 60.12 | c | 52.80 | b | 44.32 | i | 37.10 | a | 26.83 | d | 42.98 | c | |
2017 | 24.75 | c | 31.62 | c | 36.58 | a | 38.57 | 48.40 | a | 56.31 | a | 64.32 | 62.52 | a | 54.60 | 46.24 | 39.17 | 32.85 | 44.66 | |||||||
2018 | 34.15 | 30.25 | 30.75 | a | 41.40 | 46.98 | a | 55.69 | a | 65.29 | 61.45 | b | 54.91 | b | 43.50 | 37.52 | d | 28.79 | j | 45.63 | a | |||||
2019 | 28.83 | b | 23.30 | 30.97 | 40.24 | a | 40.11 | 53.86 | a | 59.13 | 60.23 | 52.73 | f | 42.70 | d | 37.81 | a | 26.87 | 40.37 | a | ||||||
2020 | 29.23 | 32.57 | b | 29.58 | a | 39.22 | 47.57 | a | 54.62 | a | 60.71 | c | 63.90 | b | 58.76 | a | 50.92 | 35.85 | 29.35 | a | 44.36 | |||||
2021 | 29.00 | 30.88 | 30.55 | 41.05 | 48.56 | 60.42 | 66.93 | j | 65.44 | w | ----- | z | ----- | z | ----- | z | ----- | z | 40.08 | f | ||||||
2022 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2023 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.42 | a | 39.08 | 37.26 | 41.25 | i | ||
2024 | 32.29 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 27.73 | 29.34 | 32.88 | 37.51 | 45.37 | 53.83 | 60.26 | 59.49 | 53.70 | 44.35 | 34.62 | 27.49 | 42.12 | |||||||||||||
S.D. | 3.15 | 3.34 | 3.41 | 3.59 | 3.54 | 2.83 | 2.38 | 2.31 | 2.63 | 3.26 | 3.32 | 3.73 | 1.32 | |||||||||||||
SKEW | 0.20 | 0.23 | -0.24 | -0.40 | -0.34 | -0.30 | -0.04 | -0.72 | -0.57 | 0.23 | -0.34 | 0.07 | -0.09 | |||||||||||||
MAX | 35.22 | 37.93 | 39.32 | 43.97 | 53.17 | 60.42 | 65.29 | 63.90 | 58.76 | 50.92 | 41.58 | 37.26 | 44.66 | |||||||||||||
MIN | 21.58 | 22.38 | 24.84 | 27.28 | 36.50 | 46.97 | 55.15 | 52.29 | 46.13 | 38.55 | 26.37 | 18.94 | 39.46 | |||||||||||||
YRS | 49 | 51 | 52 | 52 | 50 | 50 | 48 | 46 | 46 | 50 | 51 | 51 | 32 |