YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.06 | 63.15 | 54.63 | 48.66 | 40.62 | 30.08 | a | 50.37 | f | |||||
1966 | 22.70 | c | 24.07 | a | 36.55 | 44.52 | 55.05 | 61.43 | 66.89 | 66.65 | 59.68 | 47.63 | 40.71 | b | 29.90 | a | 46.31 | |||||||||
1967 | 28.95 | a | 34.38 | 41.60 | 40.78 | 49.65 | 56.15 | 66.81 | 63.85 | 58.20 | 49.73 | 42.40 | 26.09 | b | 46.55 | |||||||||||
1968 | 26.94 | 35.90 | 37.50 | 41.12 | 50.45 | b | 60.89 | c | 66.18 | a | 60.64 | b | 57.84 | e | 49.57 | d | 36.60 | d | 28.28 | f | 47.60 | a | ||||
1969 | 34.89 | h | 30.02 | h | 32.70 | d | 44.33 | 52.73 | 59.25 | 67.53 | b | 67.31 | 59.87 | c | 44.56 | 36.37 | c | 33.50 | f | 51.63 | c | |||||
1970 | 31.44 | d | 35.84 | 34.55 | b | 37.77 | 53.90 | 60.43 | 67.84 | 66.19 | 55.20 | 43.65 | e | 39.82 | 31.88 | c | 46.54 | |||||||||
1971 | 30.08 | 32.59 | 38.03 | 42.42 | 47.34 | 59.16 | a | 68.63 | a | 63.97 | 58.96 | d | 43.32 | a | 36.68 | 24.39 | d | 45.46 | ||||||||
1972 | 32.47 | b | 36.26 | d | 43.83 | a | 43.98 | i | 51.65 | 59.90 | a | 68.60 | 63.81 | 56.68 | 47.08 | f | 31.02 | j | 26.46 | g | 51.65 | d | ||||
1973 | 25.28 | f | 30.14 | c | 30.54 | c | 39.80 | b | 52.43 | c | 60.62 | a | 66.53 | a | 64.61 | 57.41 | c | 49.65 | a | 38.93 | c | 34.43 | i | 49.07 | b | |
1974 | 28.18 | c | 31.10 | b | 41.57 | b | 43.26 | c | 55.81 | 66.20 | 67.03 | 64.33 | b | 58.52 | b | 49.07 | i | 37.48 | e | 27.48 | h | 49.35 | b | |||
1975 | 29.65 | a | 29.86 | c | 34.60 | b | 37.55 | b | 48.11 | 58.67 | 66.98 | a | 64.62 | a | 58.04 | c | 48.50 | o | 35.08 | j | 27.88 | o | 47.56 | c | ||
1976 | 27.79 | n | 35.31 | p | 36.34 | i | 40.89 | h | 52.83 | k | 56.39 | l | 66.47 | 63.22 | a | 56.50 | 45.53 | a | 36.86 | a | 28.61 | 49.53 | f | |||
1977 | 25.48 | 34.41 | a | 34.02 | 43.75 | 47.95 | 61.50 | 68.39 | 66.06 | 60.17 | c | 50.26 | 39.95 | j | 35.40 | 47.94 | a | |||||||||
1978 | 30.87 | 31.24 | a | 40.93 | a | 46.45 | 52.38 | a | 62.75 | 69.26 | 65.84 | 59.78 | 52.70 | a | 39.33 | 22.36 | b | 47.83 | ||||||||
1979 | 26.26 | 28.13 | a | 35.63 | 44.10 | 49.70 | a | 58.18 | 66.44 | 62.79 | 61.38 | d | 50.21 | 33.40 | 31.83 | a | 45.67 | |||||||||
1980 | 31.26 | l | 37.36 | a | 36.94 | f | 42.38 | 46.44 | 62.88 | 67.61 | 66.39 | 58.77 | 47.12 | a | 37.62 | 35.76 | 50.23 | b | ||||||||
1981 | 33.90 | a | 35.56 | a | 35.63 | 47.50 | 52.56 | 65.93 | 68.31 | 65.60 | 58.03 | a | 46.32 | 40.43 | 33.47 | 48.60 | ||||||||||
1982 | 27.69 | g | 29.50 | l | 36.75 | g | 45.08 | l | 50.10 | j | 56.65 | j | 66.83 | b | 65.23 | a | 59.23 | 45.25 | e | 35.92 | d | 27.88 | b | 50.06 | f | |
1983 | 29.29 | e | 32.40 | c | 37.09 | b | 38.22 | a | 48.30 | f | 58.12 | b | 67.73 | 63.79 | 62.33 | a | 48.20 | d | 36.59 | b | 33.69 | d | 46.13 | a | ||
1984 | 29.67 | j | 31.63 | j | 37.33 | j | 41.55 | 59.06 | 60.62 | 66.62 | b | 63.56 | d | 59.82 | 43.52 | f | 37.84 | k | 32.31 | m | 58.54 | f | ||||
1985 | 27.78 | h | 27.50 | k | 36.93 | i | 46.71 | d | 54.07 | b | 63.52 | a | 68.13 | a | 66.85 | 55.34 | a | 48.56 | d | 37.10 | i | 31.53 | l | 57.60 | e | |
1986 | 36.73 | k | 36.44 | j | 40.24 | j | 46.25 | h | 52.47 | a | 61.95 | a | 65.39 | c | 66.28 | a | 56.16 | a | 44.69 | g | 38.74 | g | 32.48 | j | 60.45 | g |
1987 | 28.75 | k | 31.32 | h | 31.43 | k | 47.22 | c | 50.65 | a | 61.75 | b | 64.83 | d | 63.19 | d | 57.71 | d | 51.13 | h | 37.83 | l | 30.59 | h | 57.56 | f |
1988 | 31.47 | o | 34.84 | j | 37.39 | h | 45.02 | j | 50.81 | b | 62.28 | e | 68.08 | a | 65.10 | b | 55.68 | e | 52.54 | e | 39.40 | i | 26.62 | k | 59.08 | f |
1989 | 24.48 | j | 31.58 | j | 41.58 | g | 49.88 | i | 54.48 | 61.17 | c | 68.38 | a | 63.74 | b | 58.50 | j | 46.71 | c | 37.07 | g | 30.55 | k | 58.90 | g | |
1990 | 29.57 | j | 31.72 | j | 37.88 | j | 46.62 | e | 51.66 | 64.85 | 67.82 | a | 63.83 | a | 60.37 | 48.69 | j | 37.27 | j | 24.98 | k | 59.19 | f | |||
1991 | 29.36 | j | 36.58 | i | 31.81 | j | 42.34 | b | 51.20 | a | 56.21 | k | 67.76 | f | 65.77 | a | 60.00 | c | 50.86 | i | 38.71 | k | 28.62 | j | 54.83 | h |
1992 | 24.00 | j | 34.34 | j | 38.14 | i | 49.24 | a | 53.40 | a | 60.17 | 65.29 | 64.41 | c | 59.63 | 51.08 | g | 33.82 | k | 27.60 | j | 58.69 | f | |||
1993 | 31.95 | l | 34.00 | h | 40.41 | i | 45.90 | i | 55.06 | e | 60.72 | 67.05 | 65.59 | c | 58.10 | 48.33 | h | 37.18 | k | 30.14 | m | 61.30 | g | |||
1994 | 33.26 | l | 30.16 | i | 40.21 | j | 45.63 | c | 51.55 | a | 65.16 | b | 68.55 | c | 68.12 | a | 59.83 | c | 47.76 | l | 33.71 | k | 33.12 | j | 59.81 | f |
1995 | 31.91 | o | 38.97 | l | 40.37 | l | 41.97 | o | 49.17 | b | 58.77 | 66.57 | b | 68.33 | d | 61.86 | e | 49.40 | j | 44.10 | o | 38.04 | s | 60.94 | g | |
1996 | 32.91 | n | 37.17 | i | 39.31 | j | 47.25 | d | 59.15 | 65.12 | a | 70.12 | c | 67.77 | a | 57.76 | a | 48.66 | f | 40.75 | l | 36.24 | j | 61.19 | f | |
1997 | 29.97 | n | 31.92 | j | 41.76 | j | 44.21 | i | 56.94 | 60.14 | a | 66.58 | 66.03 | a | 62.43 | b | 47.95 | j | 41.44 | l | 29.93 | k | 62.42 | g | ||
1998 | 34.08 | k | 30.53 | j | 37.55 | i | 39.05 | h | 48.90 | k | 59.74 | m | 68.33 | h | 67.32 | i | 60.54 | g | 47.35 | k | 39.79 | k | 30.93 | i | ----- | z |
1999 | 34.82 | l | 35.19 | j | 41.40 | g | 42.38 | j | 50.80 | i | 60.86 | i | 67.29 | g | 64.40 | j | 58.54 | g | 50.35 | k | 43.66 | k | 30.44 | m | ----- | z |
2000 | 35.76 | l | 36.47 | j | ----- | z | 49.39 | l | 57.27 | g | 64.96 | b | 68.58 | k | 65.54 | g | 61.65 | j | 49.80 | p | 33.06 | m | 34.11 | l | 64.96 | k |
2001 | 29.33 | m | 32.56 | j | 39.00 | h | 44.84 | n | 58.45 | i | 62.68 | k | 66.53 | n | 65.32 | n | 62.57 | i | 53.02 | i | 39.39 | k | 27.77 | r | ----- | z |
2002 | 31.41 | i | 32.26 | i | 37.00 | k | 49.80 | j | 55.63 | h | 64.50 | c | 71.05 | j | 67.60 | f | 61.25 | f | 46.95 | j | 38.03 | k | 29.91 | o | 64.50 | k |
2003 | 36.90 | k | 34.63 | i | 37.95 | j | 42.05 | i | 56.65 | h | 62.88 | i | 70.62 | a | 66.94 | g | 60.57 | i | 55.00 | l | 37.59 | n | 32.08 | m | 70.62 | k |
2004 | 29.25 | i | 30.47 | j | 44.05 | i | 45.41 | g | 55.52 | h | 62.00 | h | 66.10 | g | 64.75 | k | 58.15 | g | 46.92 | l | 35.71 | i | 32.95 | j | ----- | z |
2005 | 33.35 | k | 32.95 | g | 35.97 | n | 43.95 | i | 55.22 | h | 60.87 | g | 69.38 | g | 63.48 | c | 60.24 | g | 48.71 | j | 41.52 | e | 32.83 | d | 45.95 | i |
2006 | 31.11 | c | 35.02 | c | 35.31 | g | 45.94 | f | 56.82 | c | 65.38 | a | 68.92 | 64.34 | c | 55.46 | f | 47.46 | f | 38.88 | i | 27.91 | i | 53.60 | f | |
2007 | 24.82 | i | 33.98 | g | 40.29 | g | 46.50 | b | 54.60 | 64.74 | a | 69.79 | 67.05 | 61.58 | e | 48.04 | d | 42.46 | d | 28.08 | f | 56.84 | d | |||
2008 | 25.67 | g | 30.96 | e | 38.65 | e | 44.73 | d | 50.33 | a | 63.42 | 68.02 | 67.66 | b | 59.52 | a | 47.41 | d | 40.20 | b | 31.77 | i | 51.09 | b | ||
2009 | 32.42 | g | 35.41 | f | 39.27 | c | 42.91 | a | 57.44 | 57.80 | b | 69.50 | 65.43 | a | 58.64 | a | 46.13 | d | 40.39 | g | 25.98 | g | 54.64 | d | ||
2010 | 29.79 | g | 31.50 | g | 36.11 | i | 44.75 | b | 50.12 | c | 62.72 | c | 69.58 | 65.68 | 61.17 | 51.87 | h | 37.75 | d | 36.69 | b | 53.56 | d | |||
2011 | 27.60 | 26.92 | d | 39.88 | g | 45.63 | g | 50.02 | d | 61.28 | c | 67.69 | d | 69.03 | 60.25 | 49.50 | 37.35 | 27.39 | 47.70 | b | ||||||
2012 | 34.15 | 33.91 | b | 39.81 | 47.47 | 55.21 | 65.83 | a | 68.56 | 67.44 | 60.07 | a | 51.50 | 42.07 | h | 31.95 | c | 50.53 | a | |||||||
2013 | 23.04 | c | 28.35 | a | 41.83 | a | 46.15 | d | 54.05 | b | 66.67 | 68.73 | 65.55 | 59.05 | a | 45.88 | a | 37.45 | i | 28.27 | 47.96 | a | ||||
2014 | 34.85 | a | 39.19 | a | 40.26 | 44.67 | f | 53.69 | 64.97 | 68.37 | 64.32 | 61.62 | 51.89 | 41.23 | 34.16 | c | 50.41 | a | ||||||||
2015 | 32.63 | 40.41 | 42.48 | 46.16 | a | 49.62 | a | 64.95 | b | 66.40 | 68.11 | 62.22 | 51.56 | 36.25 | 29.23 | 49.17 | ||||||||||
2016 | 28.82 | 35.69 | 42.00 | 45.57 | b | 51.13 | 67.75 | 69.90 | 63.84 | 58.35 | 53.25 | a | 39.63 | 33.66 | 49.13 | |||||||||||
2017 | 30.23 | a | 38.18 | 42.69 | 46.70 | 53.16 | 67.20 | 69.16 | 66.02 | 59.57 | 51.35 | 45.54 | b | 35.22 | d | 50.42 | ||||||||||
2018 | 34.26 | b | 34.27 | b | 39.07 | a | 49.45 | a | 54.13 | 67.67 | 70.52 | 68.89 | 62.73 | 48.55 | 37.67 | 32.02 | d | 49.93 | ||||||||
2019 | 31.32 | 28.41 | 38.55 | 47.82 | 47.32 | 61.80 | 69.39 | 69.32 | 61.00 | 47.37 | 39.86 | e | 29.86 | b | 47.67 | |||||||||||
2020 | 32.50 | f | 34.64 | d | 39.20 | c | 45.04 | b | 56.82 | f | 65.07 | b | 70.17 | b | 72.23 | 61.29 | a | 52.44 | 41.87 | 29.85 | 51.18 | b | ||||
2021 | 30.40 | a | 34.42 | b | 39.52 | d | 47.95 | 55.06 | d | 68.32 | 70.00 | 67.66 | 62.22 | 46.55 | 41.82 | 33.90 | a | 49.82 | ||||||||
2022 | 30.76 | 29.59 | a | 37.31 | 47.55 | 56.10 | b | 65.75 | 68.31 | 64.56 | 63.43 | 48.26 | 34.17 | 32.90 | a | 48.22 | ||||||||||
2023 | 28.55 | 27.89 | a | 35.78 | a | 44.62 | 52.83 | b | 58.42 | 72.79 | 67.24 | 60.58 | 51.27 | 40.28 | 34.36 | b | 47.88 | |||||||||
2024 | 30.04 | e | 33.19 | 36.04 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.09 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 29.78 | 32.91 | 38.24 | 44.58 | 52.55 | 62.60 | 68.02 | 65.66 | 59.37 | 48.60 | 38.95 | 31.20 | 47.95 | |||||||||||||
S.D. | 3.11 | 3.85 | 3.23 | 3.07 | 3.05 | 3.05 | 1.60 | 2.07 | 2.11 | 2.67 | 2.69 | 3.54 | 1.58 | |||||||||||||
SKEW | -0.51 | -0.22 | -0.33 | -0.69 | 0.11 | -0.01 | 0.30 | 0.50 | -0.29 | -0.07 | 0.11 | -0.65 | -0.07 | |||||||||||||
MAX | 34.85 | 40.41 | 43.83 | 49.45 | 59.15 | 68.32 | 72.79 | 72.23 | 63.43 | 53.25 | 45.54 | 36.69 | 50.42 | |||||||||||||
MIN | 22.70 | 24.07 | 30.54 | 37.55 | 46.44 | 56.15 | 64.83 | 60.64 | 54.63 | 43.32 | 33.40 | 22.36 | 45.46 | |||||||||||||
YRS | 27 | 31 | 30 | 38 | 46 | 49 | 51 | 52 | 49 | 35 | 31 | 28 | 15 |