YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | 47.85 | j | 52.05 | t | 65.89 | h | 70.43 | j | 71.09 | i | 61.27 | j | 54.78 | v | 34.05 | j | 32.21 | s | ----- | z |
1958 | 29.43 | k | 38.08 | p | 38.07 | j | 46.92 | k | 61.96 | h | 73.20 | j | 74.40 | j | 76.82 | l | 67.66 | k | 58.63 | p | 39.28 | n | 33.45 | l | ----- | z |
1959 | 29.62 | s | 37.17 | s | 42.44 | 53.85 | 61.30 | a | 74.39 | b | 78.92 | a | 74.42 | a | 67.70 | g | 54.03 | b | 38.98 | 32.85 | 56.80 | c | ||||
1960 | 23.92 | 31.43 | b | 43.29 | 51.16 | b | 60.24 | 71.95 | 78.47 | a | 76.97 | a | 68.83 | a | 53.95 | 42.76 | a | 28.60 | 52.63 | |||||||
1961 | 28.11 | 40.23 | 43.08 | 49.57 | 60.19 | 73.20 | 77.29 | 75.08 | 61.32 | 51.10 | b | 38.13 | 19.02 | 51.36 | ||||||||||||
1962 | 21.74 | 36.50 | 36.66 | 52.70 | 58.83 | b | 68.25 | 74.23 | a | 73.15 | 65.28 | 53.03 | 42.60 | 31.68 | 51.22 | |||||||||||
1963 | 18.55 | 36.52 | 40.11 | 47.85 | 61.97 | 68.03 | 79.05 | 75.05 | 68.53 | 59.40 | 42.48 | a | 28.17 | a | 52.14 | |||||||||||
1964 | 26.62 | a | 30.35 | b | 37.19 | 46.57 | h | 60.29 | 68.98 | 78.73 | 73.19 | 64.67 | 55.03 | 37.27 | 29.02 | a | 51.03 | a | ||||||||
1965 | 30.87 | a | 32.96 | b | 38.70 | a | 49.35 | 57.71 | 64.71 | a | 74.94 | 72.18 | 62.03 | 53.57 | b | 43.38 | 32.48 | 51.07 | ||||||||
1966 | 26.37 | e | 27.43 | 42.31 | 50.62 | 63.02 | 69.13 | 76.94 | 74.60 | 66.43 | 53.00 | 42.93 | 29.32 | 51.84 | ||||||||||||
1967 | 23.73 | 35.82 | 45.89 | 49.40 | 58.56 | 67.22 | 77.73 | 74.63 | 66.70 | 54.65 | 42.28 | 23.81 | 51.70 | |||||||||||||
1968 | 18.84 | 38.98 | 42.39 | 47.53 | 58.45 | 70.78 | 76.56 | 70.73 | 63.93 | 54.18 | 39.33 | 23.58 | 50.44 | |||||||||||||
1969 | 31.60 | 33.96 | 38.02 | 51.23 | 61.35 | 67.97 | 77.02 | 77.31 | 66.83 | 48.61 | 38.43 | 32.85 | 52.10 | |||||||||||||
1970 | 29.95 | a | 38.77 | 39.00 | 44.28 | 59.20 | a | 66.92 | 76.18 | 76.52 | 62.87 | 48.71 | 40.40 | 29.97 | 51.06 | |||||||||||
1971 | 28.89 | 34.09 | 41.15 | 49.80 | 57.48 | 69.08 | 75.81 | 75.11 | 62.66 | a | 50.56 | 37.33 | 26.73 | a | 50.72 | |||||||||||
1972 | 29.87 | 36.85 | e | 47.04 | c | 51.43 | 59.84 | 70.22 | 76.65 | 73.76 | 65.32 | 53.95 | 36.72 | 23.85 | 52.12 | |||||||||||
1973 | 18.02 | g | 32.06 | a | 40.62 | f | 47.00 | e | 58.39 | 66.43 | 74.03 | 73.69 | 62.58 | 52.97 | 39.80 | 29.84 | b | 53.68 | b | |||||||
1974 | 21.81 | 25.82 | 44.87 | 47.38 | 62.18 | a | 73.12 | 75.79 | b | 72.69 | 64.57 | 54.16 | 39.18 | 27.92 | 50.79 | |||||||||||
1975 | 24.08 | 33.21 | 40.23 | 46.17 | 55.29 | 64.72 | 73.94 | 71.48 | 64.48 | 51.56 | 36.75 | 29.81 | 49.31 | |||||||||||||
1976 | 26.35 | 39.69 | 39.84 | 50.45 | 60.00 | 68.50 | 76.77 | 72.61 | 65.22 | 49.71 | 39.82 | 27.65 | 51.38 | |||||||||||||
1977 | 21.05 | 35.48 | 39.45 | 52.97 | 58.73 | 72.68 | 76.84 | 75.44 | 66.87 | 54.79 | 42.30 | 34.85 | 52.62 | |||||||||||||
1978 | 33.26 | 35.73 | 45.87 | a | 51.40 | 56.76 | 68.97 | 75.55 | 73.52 | 65.47 | 55.31 | 41.28 | 22.79 | 52.16 | ||||||||||||
1979 | 21.60 | 27.86 | 41.34 | 49.63 | 58.47 | 66.85 | 74.90 | 70.98 | a | 66.82 | 54.97 | 33.60 | 29.22 | a | 49.69 | |||||||||||
1980 | 33.44 | 37.40 | 38.81 | 48.08 | 55.76 | 67.57 | 74.56 | 71.92 | 63.50 | 50.27 | 39.60 | 36.19 | 51.42 | |||||||||||||
1981 | 33.05 | 35.48 | 41.21 | 53.57 | 58.85 | a | 72.05 | 76.47 | 73.37 | 65.65 | 51.39 | 41.75 | 32.56 | 52.95 | ||||||||||||
1982 | 27.91 | d | 30.17 | a | 41.73 | c | 48.48 | b | 57.98 | d | 67.23 | 74.61 | 74.02 | a | 65.80 | b | 48.40 | a | 38.07 | 30.83 | a | 50.44 | ||||
1983 | 29.72 | a | 36.19 | b | 41.50 | a | 43.43 | b | 55.58 | a | 65.05 | 74.62 | c | 74.56 | 67.57 | a | 52.71 | b | 38.72 | a | 32.00 | 50.97 | ||||
1984 | 26.65 | 32.55 | 40.43 | a | 45.83 | a | ----- | z | 68.98 | a | 76.18 | 74.71 | 66.31 | a | 47.31 | 38.64 | a | 33.26 | 50.08 | a | ||||||
1985 | 30.42 | 32.16 | 42.95 | 52.29 | a | 58.62 | a | 70.59 | a | 76.58 | a | 73.83 | a | 60.60 | 52.60 | 39.35 | ----- | z | 53.64 | a | ||||||
1986 | 34.18 | ----- | z | 45.63 | 50.66 | b | 58.53 | 70.16 | a | 72.69 | 75.45 | 62.08 | 50.24 | 39.60 | 31.84 | b | 53.73 | a | ||||||||
1987 | 26.83 | b | 36.43 | a | 39.40 | 52.37 | c | 58.77 | a | 70.27 | 73.45 | 71.43 | c | 63.02 | a | 54.34 | 38.33 | a | 26.72 | a | 50.95 | |||||
1988 | 23.75 | a | 35.48 | 39.72 | a | 49.90 | 58.82 | a | 71.83 | a | 76.25 | a | 73.84 | b | 62.88 | b | 56.50 | a | 40.57 | a | 29.48 | a | 51.58 | |||
1989 | 24.67 | a | 34.07 | 47.37 | a | 55.17 | 62.76 | b | 69.10 | a | 76.90 | b | 72.69 | 66.14 | a | 52.24 | 40.54 | c | 28.78 | a | 52.54 | |||||
1990 | 25.12 | a | 34.60 | b | 44.12 | b | 53.21 | a | 58.34 | 72.16 | b | 76.34 | ----- | z | 69.10 | a | 51.93 | a | 39.38 | b | 21.33 | b | 49.60 | a | ||
1991 | 21.60 | a | 34.34 | 41.52 | b | 47.50 | a | 58.32 | a | 66.03 | 75.17 | b | 74.68 | 65.57 | a | 54.82 | 37.85 | 27.05 | a | 50.37 | ||||||
1992 | 24.95 | 37.72 | 44.67 | d | 55.14 | a | 60.20 | a | 67.12 | 72.39 | 72.55 | a | 64.68 | b | 55.05 | a | 34.75 | 21.37 | 50.88 | |||||||
1993 | 35.02 | 37.83 | a | 44.68 | 51.28 | c | 61.76 | b | 67.20 | c | 73.52 | b | 71.93 | b | 63.11 | b | 50.75 | a | 36.15 | d | 29.05 | a | 51.86 | |||
1994 | 31.50 | c | 32.90 | c | 45.03 | b | 51.46 | c | 60.34 | c | 72.78 | a | 76.85 | a | 78.03 | a | 66.38 | 50.93 | a | ----- | z | 32.43 | a | 54.42 | a | |
1995 | 33.26 | 41.43 | 44.05 | b | 47.46 | b | 55.31 | b | ----- | z | 73.67 | b | ----- | z | ----- | z | 50.58 | f | 41.28 | a | 31.45 | c | 45.99 | d | ||
1996 | 30.82 | c | 40.12 | c | 42.64 | c | 50.98 | e | 63.66 | 71.88 | a | 78.43 | d | 75.73 | ----- | z | 52.98 | d | 40.10 | d | 32.27 | c | 52.69 | a | ||
1997 | 28.61 | c | ----- | z | 44.29 | c | 47.45 | b | 62.05 | c | ----- | z | 74.13 | 73.26 | b | 68.30 | b | 51.88 | c | 40.48 | d | 31.81 | e | 52.22 | b | |
1998 | ----- | z | 35.38 | d | 42.38 | b | 46.94 | e | 58.30 | c | 65.90 | e | 79.56 | e | 75.70 | c | 69.25 | b | 52.87 | h | 43.90 | j | 31.25 | a | 56.07 | c |
1999 | 34.08 | a | 37.36 | 45.73 | a | 45.74 | c | 56.73 | a | 67.23 | 76.50 | a | 73.82 | a | 62.31 | a | 52.36 | f | 42.62 | b | 28.88 | e | 51.91 | a | ||
2000 | 33.25 | c | 38.58 | d | 41.48 | 52.17 | c | 62.55 | a | 72.87 | 76.95 | 77.12 | a | 65.23 | b | 51.48 | a | 32.45 | k | 30.95 | t | 57.17 | b | |||
2001 | 29.62 | e | 34.69 | b | 44.50 | b | 50.34 | a | 63.22 | b | 71.31 | a | 77.60 | 73.87 | 67.39 | b | 54.18 | a | 43.80 | b | 29.30 | a | 53.32 | |||
2002 | 30.28 | b | 34.96 | o | 38.52 | c | 55.47 | a | 62.11 | 74.19 | a | 80.38 | b | 73.47 | b | 65.31 | a | 50.29 | b | 39.72 | a | 30.53 | a | 54.57 | a | |
2003 | 36.13 | a | 34.86 | 42.26 | 49.55 | 61.76 | b | 71.75 | 81.18 | 77.22 | a | 65.50 | 57.43 | a | 38.98 | 32.74 | d | 54.11 | ||||||||
2004 | 29.31 | b | 31.48 | 48.61 | 51.67 | a | 62.26 | 70.65 | 76.82 | 73.44 | 62.43 | a | 51.05 | 40.03 | a | 30.84 | b | 52.38 | ||||||||
2005 | 37.05 | b | 38.52 | 42.76 | 49.83 | 60.53 | 68.38 | 77.53 | 73.56 | 66.40 | 53.77 | a | 40.74 | a | 30.00 | a | 53.26 | |||||||||
2006 | 31.45 | a | 35.27 | 41.97 | 52.88 | 63.66 | 73.70 | 79.16 | 72.67 | a | 61.12 | 50.08 | 42.17 | a | 30.77 | a | 52.91 | |||||||||
2007 | 25.97 | a | 35.50 | 45.44 | 51.42 | 60.66 | 71.98 | 79.47 | a | 77.16 | 67.53 | 52.35 | 43.05 | a | 29.32 | a | 53.32 | |||||||||
2008 | 23.97 | b | 32.98 | 41.97 | a | 48.37 | 57.05 | 69.70 | 78.13 | a | 76.40 | 65.70 | 53.45 | a | 41.77 | b | 30.17 | a | 51.64 | |||||||
2009 | 32.37 | a | 36.88 | 43.40 | a | 49.62 | 64.08 | 68.43 | 78.87 | a | 74.82 | 67.69 | a | 50.40 | 41.67 | a | 25.68 | a | 52.83 | |||||||
2010 | 24.40 | a | 34.52 | 40.60 | 50.65 | 57.26 | 71.38 | 78.31 | 73.44 | 67.15 | 55.27 | 38.97 | a | 35.88 | a | 52.32 | ||||||||||
2011 | 24.36 | b | 32.48 | 44.02 | 51.47 | 57.28 | a | 71.20 | 78.58 | 77.77 | 67.52 | 52.89 | 38.80 | 29.66 | 52.17 | |||||||||||
2012 | 32.29 | 34.45 | 43.94 | 54.42 | 64.08 | 75.63 | 78.82 | 77.85 | 67.32 | 54.65 | 42.38 | 30.61 | 54.70 | |||||||||||||
2013 | 23.31 | 32.20 | 44.69 | 50.37 | 60.29 | 74.10 | 79.55 | 75.90 | 67.25 | 49.65 | 40.15 | 26.61 | 52.01 | |||||||||||||
2014 | 32.85 | 39.25 | 44.02 | 49.87 | 60.40 | 72.13 | 79.85 | 73.11 | 68.10 | 55.68 | 41.19 | a | 34.69 | 54.26 | ||||||||||||
2015 | 33.43 | a | 39.38 | 47.69 | 51.07 | 58.85 | 72.11 | b | 74.98 | 75.24 | 69.35 | 58.48 | 40.40 | 29.47 | 54.20 | |||||||||||
2016 | 27.94 | 38.05 | 46.24 | 51.93 | 60.08 | 77.03 | 78.44 | 73.62 | a | 66.73 | 58.10 | 44.98 | c | 33.65 | a | 54.73 | ||||||||||
2017 | 33.08 | 42.36 | c | 48.79 | 51.38 | 60.02 | 74.92 | 79.32 | 75.40 | 68.05 | 54.62 | e | 47.60 | d | 34.58 | 55.84 | ||||||||||
2018 | 35.24 | b | 38.25 | 44.15 | 55.93 | 64.89 | 75.33 | a | 81.45 | b | 78.23 | 70.22 | 56.38 | f | 38.58 | e | 32.38 | n | 58.23 | b | ||||||
2019 | ----- | z | 32.80 | 45.35 | 54.57 | 56.35 | 70.50 | 78.73 | 77.87 | 69.93 | 49.45 | a | 40.43 | b | 31.90 | a | 55.26 | a | ||||||||
2020 | 31.67 | a | 36.63 | c | 46.50 | 52.63 | d | 65.26 | 73.42 | 78.27 | a | 80.03 | 67.12 | b | 55.65 | d | 43.37 | 28.25 | a | 54.90 | ||||||
2021 | 31.43 | c | 35.38 | h | 42.55 | l | 53.82 | h | 63.94 | g | 75.45 | j | 81.11 | i | 75.73 | i | 71.07 | h | 53.07 | h | 44.84 | k | 34.71 | j | 31.43 | k |
2022 | 32.75 | i | 33.75 | h | 44.69 | j | 53.00 | h | 63.62 | b | 74.17 | 80.53 | 78.03 | 71.98 | 54.79 | g | 36.21 | k | 33.80 | i | 73.67 | g | ||||
2023 | 32.90 | j | 33.33 | h | 38.17 | m | 49.93 | h | 62.00 | j | 68.45 | 80.94 | 77.65 | g | 68.32 | h | 57.36 | i | 42.47 | k | 34.31 | j | 74.69 | j | ||
2024 | 31.37 | l | 37.98 | i | 44.64 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 28.51 | 35.25 | 42.85 | 50.43 | 59.92 | 70.30 | 77.02 | 74.60 | 65.81 | 52.94 | 40.21 | 29.61 | 52.16 | |||||||||||||
S.D. | 4.60 | 3.38 | 2.83 | 2.74 | 2.49 | 2.94 | 2.18 | 2.05 | 2.48 | 2.61 | 2.45 | 3.60 | 1.44 | |||||||||||||
SKEW | -0.26 | -0.43 | -0.05 | -0.25 | 0.17 | 0.06 | -0.06 | 0.41 | -0.08 | 0.15 | 0.06 | -0.79 | 0.50 | |||||||||||||
MAX | 37.05 | 42.36 | 48.79 | 55.93 | 65.26 | 77.03 | 81.45 | 80.03 | 71.98 | 59.40 | 47.60 | 36.19 | 55.84 | |||||||||||||
MIN | 18.55 | 25.82 | 36.66 | 43.43 | 55.29 | 64.71 | 72.39 | 70.73 | 60.60 | 47.31 | 33.60 | 19.02 | 49.31 | |||||||||||||
YRS | 59 | 58 | 61 | 61 | 62 | 62 | 64 | 61 | 60 | 58 | 59 | 59 | 45 |