YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.75 | b | 44.52 | 49.13 | j | |
1957 | 34.81 | j | 51.80 | m | 53.28 | b | 58.71 | b | 67.26 | 83.85 | c | 90.61 | c | 87.03 | b | 81.10 | j | 61.61 | 46.30 | c | 44.69 | b | 65.93 | c | ||
1958 | 40.67 | a | 50.24 | g | 46.48 | b | 59.14 | b | ----- | z | 83.00 | r | 92.50 | e | 95.00 | d | 80.53 | 73.65 | 53.38 | d | 51.37 | d | 65.86 | c | ||
1959 | 44.03 | 44.65 | b | 56.19 | 69.41 | a | 67.88 | f | 86.50 | 96.17 | a | 89.66 | b | 74.63 | 68.84 | 58.37 | 45.75 | c | 66.75 | a | ||||||
1960 | 35.10 | 40.83 | 56.60 | a | 64.31 | a | 71.39 | 88.86 | b | 96.00 | 89.32 | 86.29 | b | 68.81 | 49.47 | 45.80 | a | 66.06 | ||||||||
1961 | 49.06 | 49.77 | b | 53.39 | 64.30 | 71.08 | e | 88.82 | b | 93.34 | b | 91.96 | g | 74.00 | a | 67.46 | c | 49.97 | a | 39.87 | h | 66.12 | b | |||
1962 | 35.97 | b | 39.29 | g | 48.33 | g | 70.42 | f | 67.96 | f | 84.12 | d | 90.33 | g | 87.52 | d | 84.61 | b | ----- | z | 63.39 | g | 60.65 | k | 73.05 | h |
1963 | 40.96 | g | 56.46 | 49.48 | h | 49.90 | a | 64.29 | g | 75.31 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.56 | i | |
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 | 78.36 | i | 81.75 | j | 89.12 | g | 90.44 | d | 82.16 | e | ----- | z | 50.12 | f | 39.15 | d | 70.58 | i |
1967 | 37.46 | e | 47.17 | e | 49.16 | f | ----- | z | 74.26 | h | 77.35 | d | 92.26 | d | ----- | z | 84.46 | d | 67.88 | f | ----- | z | ----- | z | 67.74 | g |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 83.50 | f | 93.39 | 81.10 | 79.47 | 68.00 | c | 48.47 | 38.23 | a | 68.11 | f | ||||
1969 | 37.61 | 40.64 | 50.61 | 64.40 | 78.93 | a | 78.77 | 90.52 | 91.94 | 82.62 | d | 57.55 | 55.47 | 41.26 | 64.19 | |||||||||||
1970 | 40.93 | b | 53.00 | 52.13 | 54.76 | a | ----- | z | 80.97 | 91.71 | 92.65 | 78.57 | 64.94 | ----- | z | 35.80 | a | 64.54 | b | |||||||
1971 | 42.83 | a | 48.41 | a | 51.97 | a | 61.57 | 68.13 | 78.43 | 92.68 | 94.10 | 76.33 | 61.06 | 49.50 | 35.00 | 63.33 | ||||||||||
1972 | 36.81 | 46.10 | 61.07 | a | 60.93 | 77.32 | 84.93 | 92.33 | a | 91.81 | 72.86 | i | 64.68 | 47.17 | ----- | z | 66.31 | b | ||||||||
1973 | 38.91 | i | 47.39 | 49.87 | 61.72 | a | ----- | z | ----- | z | 94.03 | b | 89.42 | ----- | z | ----- | z | 46.80 | 43.35 | e | 61.80 | e | ||||
1974 | 38.57 | a | 44.50 | 53.61 | 60.50 | 71.06 | 88.73 | 88.14 | b | 89.63 | a | ----- | z | ----- | z | ----- | z | ----- | z | 66.84 | d | |||||
1975 | ----- | z | ----- | z | ----- | z | 54.93 | o | 69.72 | b | 79.74 | g | 92.74 | l | 85.71 | c | ----- | z | 62.53 | a | ----- | z | 40.05 | k | 72.66 | i |
1976 | 41.24 | b | 47.89 | a | 52.31 | b | 62.74 | c | 77.07 | a | 78.12 | d | 90.61 | 80.93 | c | 78.00 | 67.61 | ----- | z | 47.46 | c | 65.82 | a | |||
1977 | 34.73 | a | 50.52 | a | 49.97 | b | 69.07 | b | 62.23 | 84.90 | 88.71 | c | 88.07 | b | 77.17 | a | 69.43 | c | 51.38 | a | 43.07 | c | 64.10 | |||
1978 | 41.59 | b | 45.29 | ----- | z | 57.20 | 67.55 | 79.00 | a | 88.62 | b | 86.03 | 74.93 | c | 72.21 | b | 47.79 | a | 37.52 | b | 63.43 | a | ||||
1979 | 33.71 | 41.85 | a | 55.39 | c | 61.91 | g | 73.68 | 83.71 | b | 90.19 | e | ----- | z | 83.16 | e | 68.42 | 48.20 | e | 41.25 | c | 61.96 | b | |||
1980 | 38.93 | b | 48.28 | 49.73 | e | 64.45 | a | 69.59 | b | 75.19 | c | 88.22 | d | 86.13 | 78.93 | a | 69.55 | b | ----- | z | 48.74 | l | 66.90 | b | ||
1981 | 45.48 | b | 48.58 | d | 53.76 | b | 64.95 | h | 68.40 | a | 83.17 | a | 89.56 | m | 92.90 | k | 82.42 | d | 61.85 | d | 52.04 | c | 44.36 | c | 60.01 | c |
1982 | 35.57 | a | 43.65 | b | 49.29 | 60.90 | i | 71.03 | 78.46 | b | 86.00 | b | ----- | z | 72.61 | b | 63.62 | b | 45.83 | f | 37.13 | p | 62.53 | d | ||
1983 | 42.35 | e | 46.69 | b | 49.52 | b | 56.48 | g | 70.54 | c | 76.10 | a | 84.61 | 88.20 | f | 79.83 | a | 68.70 | a | 48.28 | e | 36.78 | d | 60.34 | b | |
1984 | 31.35 | 41.24 | 51.47 | a | 56.31 | d | 71.13 | a | 77.48 | c | ----- | z | 88.90 | 78.79 | b | 58.32 | c | 49.26 | g | 39.38 | j | 61.67 | c | |||
1985 | 37.07 | d | 39.91 | e | 49.24 | f | 67.41 | a | 72.52 | 87.42 | d | 92.84 | l | 84.91 | h | 70.92 | f | 65.59 | d | 43.68 | h | 37.62 | r | 61.66 | f | |
1986 | 47.29 | c | 50.16 | c | 61.00 | m | 63.92 | d | 74.65 | e | 90.00 | u | 89.33 | s | 95.53 | n | 71.93 | c | 72.74 | h | 55.78 | g | 47.38 | j | 61.59 | g |
1987 | 36.82 | c | 50.71 | d | 54.75 | g | 73.29 | b | 74.15 | e | 85.31 | d | 87.09 | h | 93.29 | g | 87.86 | b | 77.10 | b | 53.30 | 41.43 | a | 64.44 | c | |
1988 | 38.60 | a | 52.56 | b | 58.67 | d | 67.32 | e | 73.52 | b | 88.22 | g | 94.81 | e | 93.31 | e | 81.81 | d | 79.68 | 49.80 | j | 38.30 | a | 67.86 | b | |
1989 | 33.42 | 36.26 | a | 53.68 | 69.23 | 73.08 | f | 85.19 | c | 95.72 | f | 87.96 | c | 81.14 | a | 67.17 | a | 55.00 | a | 45.70 | d | 61.47 | b | |||
1990 | 43.23 | 42.43 | 59.45 | b | 70.93 | a | 69.35 | 83.85 | c | 93.72 | b | 91.75 | c | 87.19 | d | 70.93 | a | 52.83 | 31.93 | b | 66.47 | |||||
1991 | 40.28 | b | 57.18 | 50.81 | 59.43 | b | 67.55 | b | 81.25 | b | 94.03 | b | 92.54 | e | 84.60 | 71.72 | b | 53.46 | b | 44.43 | c | 66.44 | ||||
1992 | 44.30 | d | 53.93 | b | 62.52 | 70.79 | a | 83.66 | b | 83.78 | c | 90.23 | a | 93.00 | a | 84.00 | a | 72.23 | 50.57 | b | 36.23 | 68.77 | ||||
1993 | 29.58 | 37.33 | a | 56.32 | c | 61.88 | d | 76.30 | a | 76.24 | a | 82.50 | c | 86.57 | c | 82.14 | a | 68.79 | b | 49.07 | b | 42.70 | d | 62.45 | ||
1994 | 48.38 | b | 44.52 | a | 61.97 | b | 65.07 | c | 73.65 | 84.89 | b | 94.72 | b | 93.83 | b | 84.72 | e | 67.35 | h | 39.90 | 35.00 | c | 66.06 | a | ||
1995 | 40.93 | c | 58.38 | d | 54.17 | h | ----- | z | 68.15 | d | 78.41 | c | 90.21 | c | 92.23 | i | 84.41 | c | 72.24 | f | 61.13 | g | 45.35 | e | 66.55 | e |
1996 | 41.48 | d | 47.91 | f | 56.59 | d | 62.89 | b | 68.36 | q | 83.35 | d | 94.69 | b | 92.79 | b | 81.56 | c | 67.30 | d | 55.29 | b | 43.65 | e | 67.96 | b |
1997 | 40.63 | d | 46.67 | d | 59.45 | b | 61.38 | d | ----- | z | 79.61 | b | 90.17 | a | 92.34 | b | 81.59 | h | 68.05 | i | 53.36 | e | 40.07 | d | 62.63 | c |
1998 | 44.00 | d | 42.48 | c | 54.81 | e | 59.63 | c | 65.86 | c | ----- | z | 95.78 | d | 96.12 | e | 79.76 | e | 63.89 | c | 48.00 | e | 36.97 | b | 62.48 | a |
1999 | 43.04 | c | 47.26 | e | 55.56 | f | 60.12 | f | 72.86 | b | 84.50 | d | 93.73 | e | 90.84 | f | 82.29 | b | 72.47 | a | 57.16 | e | 44.65 | e | 66.44 | c |
2000 | 42.17 | a | 45.83 | 54.81 | 68.64 | b | 72.62 | j | 86.65 | d | 91.54 | c | 90.32 | f | 79.00 | b | 63.97 | a | 43.65 | g | 43.92 | r | 66.57 | d | ||
2001 | 37.93 | c | 43.04 | d | 58.07 | b | 62.08 | f | 80.67 | a | 86.42 | k | 89.36 | c | 91.68 | c | 82.21 | a | 70.46 | c | 49.75 | f | 36.19 | d | 65.51 | c |
2002 | 38.10 | a | 46.26 | e | 50.50 | i | 66.91 | h | 73.73 | i | 85.74 | k | 94.55 | i | 87.00 | g | ----- | z | 68.29 | g | 52.32 | b | 46.57 | c | 45.81 | h |
2003 | 50.07 | a | 46.93 | 58.71 | 57.70 | j | 76.91 | i | 85.93 | b | 95.21 | b | 88.67 | a | 83.79 | a | 72.31 | b | 47.04 | b | 39.85 | d | 66.85 | b | ||
2004 | 36.86 | c | 40.62 | e | 63.71 | c | 68.72 | a | 73.08 | e | 84.00 | a | 91.66 | b | ----- | z | 80.62 | d | 66.43 | a | 48.19 | c | 40.78 | d | 63.15 | a |
2005 | 30.93 | a | 40.35 | b | 56.54 | c | 62.19 | c | 69.00 | d | 78.50 | d | 94.60 | a | 91.88 | f | 76.82 | b | ----- | z | 53.08 | e | 38.59 | d | 60.06 | b |
2006 | 43.33 | d | 47.87 | e | 49.72 | b | 61.00 | e | 77.48 | b | 84.42 | d | 95.66 | b | ----- | z | 79.31 | q | 65.05 | i | 49.96 | b | 38.15 | d | 60.84 | c |
2007 | 41.03 | a | ----- | z | 61.80 | a | 63.43 | 76.77 | 85.14 | a | 94.69 | b | 90.10 | b | 77.59 | a | 62.07 | a | 54.54 | d | 37.68 | i | 70.72 | b | ||
2008 | 32.27 | e | 42.26 | f | 52.59 | b | 61.07 | a | 69.46 | c | 80.64 | b | 91.32 | c | 90.10 | a | ----- | z | 66.29 | 55.12 | e | 37.43 | a | 63.63 | b | |
2009 | 39.60 | f | 46.58 | d | 53.00 | a | 62.54 | b | 75.72 | b | 77.50 | b | 90.55 | ----- | z | 82.80 | 60.65 | 53.48 | c | 33.26 | d | 63.61 | b | |||
2010 | 39.84 | f | 46.17 | d | 54.65 | e | ----- | z | 62.50 | a | 78.59 | a | 88.67 | a | 86.79 | b | 81.46 | d | 65.92 | g | 45.83 | a | 41.93 | a | 65.18 | c |
2011 | 38.87 | a | 42.27 | b | 50.30 | a | 55.69 | a | 66.00 | a | ----- | z | ----- | z | 91.70 | a | 86.64 | b | 68.55 | b | 48.07 | a | ----- | z | 60.90 | c |
2012 | 45.52 | b | 47.56 | d | 56.97 | 66.21 | a | ----- | z | 82.13 | 92.94 | 91.50 | a | 84.28 | a | 67.40 | a | 53.86 | a | 37.40 | a | 65.98 | a | |||
2013 | 26.10 | b | 44.71 | 59.42 | 64.17 | 72.32 | 84.41 | a | 94.48 | d | 89.60 | a | 77.43 | 62.33 | a | 52.70 | 35.41 | b | 63.59 | |||||||
2014 | 47.90 | 50.82 | 56.77 | 64.73 | 75.32 | 82.83 | a | 94.19 | 86.35 | 80.30 | 69.19 | 51.20 | 42.00 | a | 66.80 | |||||||||||
2015 | 46.43 | a | 54.07 | 63.37 | a | 64.83 | 71.47 | a | 88.40 | 86.00 | 90.47 | a | 81.80 | 70.35 | 46.70 | 38.23 | 66.84 | |||||||||
2016 | 35.10 | 47.21 | 55.19 | 66.83 | 69.03 | 83.70 | 89.39 | 88.67 | a | 77.43 | 64.87 | 55.23 | 34.39 | 63.92 | ||||||||||||
2017 | 32.32 | 43.86 | 55.77 | 57.90 | 72.26 | 80.63 | 92.00 | 89.52 | 76.73 | 64.06 | 52.83 | 40.90 | 63.23 | |||||||||||||
2018 | 48.06 | 43.89 | 50.35 | 62.40 | 71.61 | 80.00 | 91.68 | 87.68 | 80.67 | 64.77 | 50.90 | 36.68 | 64.06 | |||||||||||||
2019 | 38.23 | 38.04 | 50.77 | 63.00 | b | 66.16 | 80.20 | 88.39 | c | 90.04 | e | 75.04 | b | 59.48 | 53.80 | o | 38.26 | h | 64.93 | b | ||||||
2020 | 42.67 | m | 48.79 | a | 55.59 | b | 63.73 | 74.52 | 78.72 | e | 89.44 | m | 90.59 | n | 81.53 | m | 69.00 | n | 48.70 | t | 38.35 | n | 64.27 | g | ||
2021 | 42.94 | o | 40.38 | o | 51.69 | e | 62.93 | c | 72.15 | d | 87.63 | c | 93.29 | x | ----- | z | 81.48 | a | 61.89 | d | 53.76 | a | 39.59 | b | 63.89 | d |
2022 | 42.73 | a | 49.15 | a | 57.20 | a | 59.27 | 68.00 | 87.22 | u | 94.00 | e | ----- | z | 78.35 | j | 68.94 | m | 49.08 | d | 35.38 | o | 59.92 | e | ||
2023 | 39.88 | w | 43.75 | t | ----- | z | 58.09 | s | 73.25 | o | ----- | z | 94.10 | 86.77 | a | 78.30 | 64.13 | 51.30 | 43.45 | 69.67 | f | |||||
2024 | 41.81 | 47.14 | 53.45 | 61.94 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.47 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 39.80 | 46.43 | 54.83 | 63.10 | 71.71 | 82.24 | 91.68 | 89.66 | 80.52 | 66.84 | 51.05 | 40.47 | 65.02 | |||||||||||||
S.D. | 5.26 | 4.80 | 4.12 | 4.54 | 4.37 | 3.82 | 3.07 | 3.22 | 3.73 | 4.63 | 3.53 | 4.23 | 1.84 | |||||||||||||
SKEW | -0.22 | 0.29 | 0.36 | -0.22 | 0.28 | -0.06 | -0.79 | -0.56 | -0.25 | 0.31 | -0.47 | 0.19 | 0.48 | |||||||||||||
MAX | 50.07 | 58.38 | 63.71 | 73.29 | 83.66 | 88.86 | 96.17 | 96.12 | 87.86 | 79.68 | 58.37 | 51.37 | 68.77 | |||||||||||||
MIN | 26.10 | 36.26 | 46.48 | 49.90 | 62.23 | 75.19 | 82.50 | 80.93 | 71.93 | 57.55 | 39.90 | 31.93 | 62.45 | |||||||||||||
YRS | 55 | 55 | 52 | 49 | 48 | 52 | 51 | 44 | 52 | 49 | 47 | 48 | 14 |