YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 91.20 | t | 97.29 | 89.06 | 86.08 | f | 75.22 | h | 59.03 | a | 52.40 | a | 74.45 | h | ||
1964 | 47.65 | 52.45 | 55.57 | a | 65.60 | 76.04 | d | 88.25 | b | 96.13 | a | 91.97 | 85.43 | 81.61 | 56.68 | b | 48.72 | b | 70.51 | |||||||
1965 | 52.26 | 55.29 | 55.87 | 63.77 | 73.47 | a | 82.87 | 91.68 | 92.57 | a | 81.50 | 79.83 | a | 59.87 | 46.67 | a | 69.64 | |||||||||
1966 | 46.13 | 45.22 | a | 64.71 | 72.40 | 83.20 | a | 89.87 | 94.19 | 94.81 | 87.13 | 74.32 | 62.20 | 47.61 | 71.82 | |||||||||||
1967 | 45.71 | 57.43 | 63.42 | 61.97 | a | 76.71 | 83.90 | 95.16 | 93.39 | 81.83 | 78.07 | a | 62.77 | 40.74 | 70.09 | |||||||||||
1968 | 44.74 | 57.48 | 62.74 | 65.43 | 78.39 | 89.53 | 92.23 | 86.16 | 86.07 | 75.65 | 60.63 | 47.19 | j | 72.64 | a | |||||||||||
1969 | 49.44 | o | 47.11 | i | 58.33 | j | 70.88 | d | 83.23 | a | 87.19 | d | 94.55 | b | ----- | z | 84.83 | 68.41 | b | 58.63 | c | 54.43 | c | 75.27 | d | |
1970 | 49.48 | f | 58.35 | h | 56.67 | d | 64.20 | e | 82.33 | g | 89.23 | d | 95.41 | b | 93.74 | 84.48 | e | 69.80 | f | 60.62 | d | 47.40 | a | 73.97 | d | |
1971 | 51.41 | d | 55.44 | c | 62.73 | a | 68.45 | a | 74.81 | 91.11 | c | 98.18 | c | 91.23 | 84.45 | a | 67.47 | a | 55.96 | b | 42.00 | a | 70.27 | |||
1972 | 49.93 | b | 59.14 | a | 71.65 | 72.03 | 81.39 | 89.17 | a | 97.26 | 90.94 | 81.50 | 65.97 | 51.00 | 43.77 | 71.15 | ||||||||||
1973 | 35.03 | a | 46.63 | a | 51.55 | 65.00 | 79.90 | 87.45 | a | 92.74 | 89.76 | b | 84.38 | a | 75.11 | c | 58.00 | 52.93 | c | 68.21 | ||||||
1974 | 41.74 | 52.82 | 63.48 | 68.67 | 83.37 | d | 94.27 | 91.90 | a | 92.48 | d | 87.24 | e | 73.03 | 58.66 | a | 47.03 | 71.22 | ||||||||
1975 | 48.68 | 52.29 | 55.67 | a | 60.77 | 75.73 | e | 88.35 | d | 92.81 | 91.00 | b | 85.79 | f | 74.75 | c | 59.30 | 51.47 | a | 68.25 | a | |||||
1976 | 53.94 | 57.66 | 59.77 | a | 67.67 | f | 79.79 | b | 88.46 | b | 94.47 | a | 91.67 | a | ----- | z | 72.87 | 65.10 | a | 54.52 | 71.82 | b | ||||
1977 | 47.45 | 60.54 | 59.13 | 73.11 | b | 72.25 | c | 91.03 | 94.35 | 92.39 | 87.77 | d | 75.27 | a | 59.90 | a | 50.97 | 72.01 | ||||||||
1978 | 43.37 | a | 46.75 | 58.90 | 65.10 | a | 75.45 | b | 87.97 | a | 93.32 | 92.68 | 82.43 | 78.00 | 56.37 | 40.00 | a | 68.36 | ||||||||
1979 | 37.20 | a | 44.21 | 56.97 | 69.33 | 78.00 | c | 90.71 | b | 96.13 | 89.39 | 90.47 | 77.61 | 55.10 | 52.23 | 69.78 | ||||||||||
1980 | 48.03 | a | 55.86 | 55.55 | 69.40 | 72.58 | 88.70 | ----- | z | 91.23 | 85.77 | 73.35 | 62.10 | 58.94 | 69.23 | a | ||||||||||
1981 | 56.16 | 59.11 | 58.19 | 73.93 | a | 77.13 | a | 93.10 | 93.94 | 91.34 | b | 84.16 | e | 67.92 | e | 63.17 | a | 53.76 | b | 72.66 | ||||||
1982 | 44.84 | 51.19 | b | 57.13 | 66.52 | a | 76.16 | 87.11 | c | 92.83 | a | 87.48 | 82.15 | d | 68.83 | g | 54.00 | a | 46.62 | b | 67.82 | a | ||||
1983 | 49.48 | 53.54 | 56.45 | 61.00 | a | 77.13 | a | 88.07 | 92.26 | d | 89.87 | a | 86.93 | a | 73.61 | 57.69 | a | 50.62 | b | 69.72 | ||||||
1984 | 52.90 | a | 57.24 | 64.14 | b | 68.52 | g | 87.30 | a | 89.31 | a | 93.48 | 91.16 | 87.54 | b | 67.36 | c | 58.00 | a | 45.60 | a | 72.18 | a | |||
1985 | 47.38 | b | 51.00 | 59.80 | a | 75.30 | 81.45 | 93.27 | 96.29 | c | 95.35 | 80.70 | c | 73.03 | a | 51.62 | a | 52.52 | 71.48 | |||||||
1986 | 58.97 | 57.00 | 66.48 | 73.11 | b | 82.61 | c | 93.60 | 93.48 | b | 93.87 | a | 79.03 | 70.16 | 61.20 | 50.39 | c | 73.33 | ||||||||
1987 | 47.00 | e | ----- | z | 58.31 | b | 74.23 | 79.40 | a | 93.79 | b | 93.52 | 90.62 | b | 86.77 | d | 75.50 | a | 54.86 | b | 46.28 | b | 72.75 | a | ||
1988 | 46.86 | c | 58.74 | b | 63.00 | c | 69.73 | 79.03 | 89.31 | d | 96.41 | d | 91.14 | i | 83.87 | 80.66 | b | 60.21 | b | 46.31 | b | 70.38 | a | |||
1989 | 41.31 | b | 51.67 | a | 67.82 | c | 77.76 | a | 80.07 | a | 90.79 | a | 97.37 | d | 90.64 | c | 85.89 | c | 73.48 | b | 63.14 | b | 55.30 | a | 72.94 | |
1990 | 50.37 | a | 51.12 | d | 63.72 | b | 70.59 | c | 79.66 | b | 93.41 | a | 95.16 | f | 91.07 | c | 83.33 | c | 74.07 | b | 59.67 | c | 42.07 | d | 69.01 | a |
1991 | 45.82 | c | 59.74 | a | 58.08 | f | 67.59 | c | 77.32 | c | 87.13 | 95.42 | 93.10 | 85.24 | a | 76.26 | 57.97 | a | 45.65 | 71.93 | a | |||||
1992 | 42.74 | 54.41 | 59.47 | a | 74.83 | 78.24 | b | 88.97 | a | 91.61 | 91.79 | b | 85.00 | b | 74.71 | 54.76 | a | 42.21 | c | 69.90 | ||||||
1993 | 45.72 | b | 48.57 | 64.00 | 70.43 | b | 79.81 | 86.77 | 93.74 | 91.45 | 86.45 | a | 71.72 | b | 56.92 | e | 48.48 | d | 70.34 | |||||||
1994 | 53.17 | b | 49.75 | 66.19 | 69.37 | 79.87 | a | 94.71 | b | 98.37 | a | 96.96 | c | 87.07 | b | 70.17 | a | 50.22 | c | 47.54 | c | 71.95 | ||||
1995 | 44.37 | a | 63.08 | b | 60.52 | b | 66.38 | d | 72.73 | a | 83.22 | c | 93.86 | c | 94.10 | b | 86.31 | a | 74.72 | b | 65.46 | f | 53.81 | o | 73.93 | b |
1996 | 51.71 | j | 58.04 | f | 63.68 | c | 71.78 | c | 82.37 | d | 94.04 | b | 96.41 | d | 95.34 | b | 82.54 | b | 71.62 | e | 57.70 | c | 48.68 | c | 76.41 | b |
1997 | 43.83 | g | 52.33 | d | 67.82 | c | 66.38 | a | 84.54 | c | 88.19 | c | 93.62 | b | 90.13 | a | 82.33 | 70.54 | c | 59.37 | c | 47.46 | c | 72.97 | a | |
1998 | 50.81 | e | 46.96 | d | 59.33 | d | 62.96 | c | 75.57 | a | 84.67 | c | 94.62 | b | 92.97 | a | 80.93 | b | 69.78 | d | 58.38 | d | 51.19 | e | 69.01 | |
1999 | 55.04 | d | 55.78 | e | 67.65 | h | 63.07 | a | 77.64 | c | 89.61 | b | 90.44 | d | 90.74 | 84.11 | c | 78.03 | a | 67.74 | c | 51.19 | d | 73.04 | a | |
2000 | 51.25 | c | 55.32 | d | 61.21 | b | 76.60 | e | 83.81 | 90.93 | b | 95.45 | 92.90 | b | 86.90 | a | 68.00 | c | 50.72 | a | 51.80 | a | 72.07 | |||
2001 | 45.47 | a | 51.21 | 60.90 | a | 66.48 | a | 82.83 | a | 90.73 | 93.55 | b | 93.42 | 89.13 | 76.73 | a | 61.45 | a | 42.52 | f | 73.81 | a | ||||
2002 | 47.10 | 54.89 | 58.77 | a | 75.56 | c | 81.90 | a | 94.34 | a | 97.00 | b | 94.19 | 82.43 | b | 67.89 | d | 57.86 | a | 46.36 | c | 71.52 | ||||
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 90.52 | e | 99.65 | 92.55 | b | 87.79 | a | 80.48 | b | 52.52 | e | 49.68 | c | 79.03 | e | |
2004 | 48.48 | b | 46.07 | 68.45 | 69.03 | a | 80.77 | a | 89.38 | a | 95.55 | t | 91.61 | m | 81.53 | o | 67.83 | a | 52.75 | b | 48.69 | b | 63.50 | c | ||
2005 | 50.07 | a | 51.11 | 58.96 | c | 68.10 | a | 78.89 | c | 84.20 | 97.24 | b | 88.90 | 84.83 | a | 71.39 | 61.55 | a | 50.14 | c | 70.45 | |||||
2006 | 50.74 | 56.20 | c | 53.90 | 69.93 | 81.59 | b | 92.20 | 95.74 | 88.90 | 83.30 | 70.58 | 63.10 | 48.43 | a | 71.22 | ||||||||||
2007 | 46.55 | b | 56.39 | 65.06 | 71.33 | 82.48 | b | 92.93 | a | 97.35 | 93.40 | a | 85.62 | a | 72.40 | a | 68.34 | a | 48.80 | a | 73.39 | |||||
2008 | 47.20 | a | 55.71 | a | 65.39 | 74.40 | 79.00 | 90.96 | b | 93.90 | 93.74 | 85.14 | a | 72.94 | 62.07 | a | 42.80 | a | 71.94 | |||||||
2009 | 48.27 | a | 52.43 | 62.32 | 66.00 | 82.90 | 83.31 | a | 96.61 | 92.61 | 87.00 | 68.58 | 63.61 | b | 41.40 | a | 70.42 | |||||||||
2010 | 44.20 | a | 47.54 | 58.90 | 66.60 | 72.19 | 89.23 | 95.84 | 91.23 | 88.28 | a | 71.87 | 55.21 | a | 49.97 | a | 69.25 | |||||||||
2011 | 47.70 | a | 48.61 | 58.42 | 65.17 | 71.68 | 87.93 | 92.42 | 95.00 | 85.33 | 72.87 | 55.79 | a | 48.00 | 69.08 | |||||||||||
2012 | 53.90 | 52.45 | 63.26 | 70.63 | 82.23 | 93.33 | 92.00 | 92.45 | 84.57 | 74.23 | 64.17 | a | 47.24 | b | 72.54 | |||||||||||
2013 | 43.37 | a | 50.00 | 64.87 | 69.10 | 79.90 | 93.97 | 94.35 | 90.17 | a | 80.57 | 68.93 | q | 57.90 | a | 44.60 | a | 69.89 | a | |||||||
2014 | 56.03 | a | 57.14 | 62.61 | 69.62 | a | 78.55 | 91.43 | 94.29 | 85.90 | 84.66 | a | 74.68 | 60.83 | a | 48.03 | a | 71.98 | ||||||||
2015 | 50.30 | a | 60.71 | 65.58 | 68.50 | 72.55 | 91.70 | 89.62 | b | 89.55 | 85.73 | 73.84 | 55.14 | a | 45.73 | a | 70.75 | |||||||||
2016 | 45.77 | a | 60.81 | b | 63.94 | 67.53 | 75.39 | 95.20 | 96.42 | 89.32 | 80.93 | 73.73 | a | 61.59 | a | 47.80 | a | 71.54 | ||||||||
2017 | 42.83 | a | 52.89 | a | 67.32 | 70.23 | 77.19 | 93.67 | 97.16 | 91.45 | 82.97 | 75.19 | 66.10 | 56.97 | 72.83 | |||||||||||
2018 | 56.26 | d | 53.82 | 59.58 | 75.00 | 79.90 | 92.95 | k | 98.00 | p | ----- | z | 89.50 | x | 67.45 | k | 59.15 | j | 49.00 | l | 64.91 | g | ||||
2019 | ----- | z | 43.27 | b | 58.57 | a | 69.61 | b | 67.39 | c | 87.37 | 95.58 | 95.52 | 87.43 | ----- | z | ----- | z | ----- | z | 75.59 | d | ||||
2020 | 52.89 | v | 53.90 | 59.17 | a | 69.36 | b | 82.80 | a | ----- | z | ----- | z | ----- | z | 88.12 | v | 79.72 | b | 63.14 | a | 50.40 | a | 65.50 | e | |
2021 | 49.60 | a | 54.96 | 59.30 | a | 71.57 | 82.23 | 95.57 | 97.00 | c | 94.03 | a | 88.37 | 68.97 | 67.34 | a | 50.40 | a | 73.28 | |||||||
2022 | 54.63 | d | 56.32 | c | 61.68 | 72.23 | 81.00 | 91.41 | a | 95.40 | f | 90.76 | b | 89.81 | d | 74.77 | e | 54.50 | l | 47.30 | u | 74.73 | c | |||
2023 | 40.81 | 48.21 | 47.92 | s | 67.46 | d | 79.65 | 87.00 | 98.87 | 91.79 | c | 84.57 | 75.00 | a | 61.30 | 54.14 | b | 71.71 | a | |||||||
2024 | 48.07 | b | 53.59 | 56.22 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.83 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 48.05 | 53.46 | 61.25 | 69.14 | 78.78 | 89.90 | 94.83 | 91.79 | 84.93 | 73.39 | 59.14 | 48.64 | 71.05 | |||||||||||||
S.D. | 4.79 | 4.56 | 4.09 | 3.98 | 3.87 | 3.21 | 2.19 | 2.24 | 2.53 | 3.77 | 4.26 | 4.11 | 1.43 | |||||||||||||
SKEW | -0.13 | -0.23 | 0.12 | -0.02 | -0.53 | -0.29 | -0.06 | -0.29 | -0.13 | 0.11 | -0.06 | 0.04 | -0.15 | |||||||||||||
MAX | 58.97 | 63.08 | 71.65 | 77.76 | 87.30 | 95.57 | 99.65 | 96.96 | 90.47 | 81.61 | 68.34 | 58.94 | 73.39 | |||||||||||||
MIN | 35.03 | 43.27 | 51.55 | 60.77 | 67.39 | 82.87 | 89.62 | 85.90 | 79.03 | 65.97 | 50.22 | 40.00 | 68.21 | |||||||||||||
YRS | 54 | 56 | 55 | 57 | 58 | 58 | 55 | 56 | 55 | 55 | 57 | 55 | 35 |