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 | 34.84 | b | 28.39 | d | 31.61 | j |
1957 | 17.55 | j | 37.83 | m | 41.09 | b | 44.21 | b | 53.84 | 64.44 | c | 68.13 | e | 62.93 | b | 57.34 | k | 46.42 | 33.61 | c | 31.91 | c | 49.62 | c | ||
1958 | 31.08 | a | 39.75 | h | 35.28 | b | 43.95 | b | ----- | z | 63.58 | r | 70.94 | e | 73.64 | i | 60.83 | x | 50.47 | b | 33.92 | e | 35.87 | d | 43.07 | e |
1959 | 33.11 | 32.44 | b | 38.95 | 49.36 | a | 51.84 | f | 65.50 | 73.30 | a | 67.57 | b | 57.68 | 50.31 | 36.85 | 27.41 | c | 48.41 | a | ||||||
1960 | 24.29 | 31.40 | 42.07 | a | 46.09 | b | 53.64 | b | 68.54 | d | 72.60 | 66.40 | 62.52 | b | 48.68 | 38.22 | 32.18 | a | 48.88 | |||||||
1961 | 32.55 | 38.35 | b | 39.90 | 46.27 | 52.00 | f | 68.72 | c | 71.91 | b | 72.61 | i | 56.31 | a | 49.19 | d | 34.56 | c | 27.30 | i | 48.64 | c | |||
1962 | 21.93 | b | 28.85 | h | 35.93 | h | 51.96 | g | 52.44 | f | 64.69 | d | 69.60 | g | 67.43 | d | 62.12 | b | ----- | z | 45.46 | g | 43.52 | k | 54.04 | h |
1963 | 24.02 | h | 43.28 | a | 39.02 | i | 38.69 | a | 52.43 | h | 58.22 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.73 | 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 | 57.48 | k | 65.14 | p | 68.33 | h | 69.48 | d | 60.71 | f | ----- | z | 38.89 | g | 29.67 | d | 49.57 | j |
1967 | 27.96 | e | 34.59 | e | 36.98 | f | ----- | z | 56.20 | h | 60.77 | d | 71.98 | d | ----- | z | 64.83 | d | 48.18 | f | ----- | z | ----- | z | 52.03 | g |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.25 | f | 72.70 | a | 62.81 | 60.13 | 50.45 | c | 38.75 | 27.16 | b | 52.00 | f | |||
1969 | 28.11 | 29.38 | 36.63 | 46.93 | 59.25 | a | 62.68 | 71.11 | 68.44 | 61.62 | d | 42.06 | 37.65 | 31.05 | 47.91 | |||||||||||
1970 | 32.22 | b | 38.31 | a | 38.15 | 39.48 | a | ----- | z | 63.23 | 70.03 | 68.74 | 55.13 | 44.47 | ----- | z | 27.58 | a | 47.74 | b | ||||||
1971 | 31.92 | a | 35.54 | a | 37.45 | a | 44.27 | 51.90 | 59.02 | 70.63 | 70.00 | 55.10 | 43.89 | 36.40 | 22.58 | a | 46.56 | |||||||||
1972 | 24.57 | a | 34.78 | 44.00 | a | 43.97 | 57.40 | 66.17 | 71.52 | d | 66.11 | l | 53.67 | i | 48.31 | 38.10 | ----- | z | 47.64 | c | ||||||
1973 | 23.56 | n | 35.55 | 38.10 | 45.74 | a | ----- | z | ----- | z | 73.43 | b | 67.84 | ----- | z | ----- | z | 37.05 | a | 34.92 | e | 47.52 | e | |||
1974 | 27.75 | a | 32.73 | 41.60 | 44.07 | 52.68 | 67.72 | 68.57 | b | 68.09 | d | ----- | z | ----- | z | ----- | z | ----- | z | 50.40 | d | |||||
1975 | ----- | z | ----- | z | ----- | z | 40.03 | o | 52.17 | b | 61.50 | g | 73.32 | l | 65.96 | d | ----- | z | 47.20 | a | ----- | z | 27.73 | k | 55.11 | i |
1976 | 28.02 | b | 36.87 | b | 37.64 | b | 45.24 | e | 57.87 | a | 59.70 | e | 70.94 | 63.45 | c | 60.80 | 48.53 | a | ----- | z | 27.54 | e | 48.78 | a | ||
1977 | 19.63 | a | 36.33 | b | 35.48 | c | 49.71 | b | 48.18 | 67.66 | a | 70.12 | c | 70.57 | b | 58.82 | b | 50.61 | c | 37.02 | a | 32.91 | d | 48.09 | ||
1978 | 33.48 | b | 36.11 | ----- | z | 44.95 | b | 52.31 | 61.26 | a | 69.90 | b | 66.81 | 57.29 | d | 51.97 | b | 33.78 | a | 24.12 | c | 48.36 | a | |||
1979 | 21.90 | 33.13 | a | 41.89 | d | 46.89 | g | 56.71 | 64.33 | c | 71.19 | e | ----- | z | 61.09 | g | 51.87 | a | 33.16 | e | 27.74 | d | 44.66 | c | ||
1980 | 29.31 | b | 37.58 | d | 36.73 | g | 48.52 | a | 54.65 | d | 56.90 | f | 69.36 | f | 66.63 | 60.55 | b | 50.34 | b | ----- | z | 33.87 | l | 49.65 | e | |
1981 | 32.84 | c | 36.33 | d | 39.55 | b | 47.70 | j | 52.73 | a | 64.78 | c | 69.64 | m | 71.72 | m | 62.90 | d | 45.52 | e | 40.04 | c | 34.12 | e | 45.42 | c |
1982 | 23.80 | a | 31.94 | c | 37.44 | 43.88 | i | 52.48 | 61.09 | c | 68.54 | c | ----- | z | 56.93 | c | 47.34 | b | 33.96 | f | 29.12 | r | 47.44 | d | ||
1983 | 32.69 | e | 36.80 | c | 40.14 | b | 42.33 | g | 54.15 | d | 59.71 | a | 66.13 | 70.40 | f | 61.16 | a | 50.84 | b | 37.19 | f | 28.94 | e | 47.84 | c | |
1984 | 18.17 | a | 29.09 | 39.29 | c | 44.28 | g | 55.26 | b | 59.94 | d | ----- | z | 70.13 | a | 59.25 | b | 44.16 | c | 38.27 | h | 26.07 | j | 46.91 | d | |
1985 | 24.78 | d | 26.78 | e | 35.34 | f | 49.78 | a | 55.37 | 68.50 | e | 74.05 | l | 65.80 | i | 54.04 | f | 48.52 | e | 29.05 | h | 21.12 | s | 45.62 | f | |
1986 | 35.37 | d | 39.94 | d | 44.85 | n | 46.87 | g | 56.04 | f | 69.71 | w | 70.00 | t | 73.93 | p | 54.80 | c | 52.02 | i | 38.52 | g | 29.19 | j | 43.37 | i |
1987 | 23.52 | d | 37.52 | g | 40.04 | h | 52.94 | c | 57.66 | f | 66.38 | e | 67.76 | h | 71.69 | g | 65.12 | b | 55.66 | b | 39.72 | 29.22 | a | 47.51 | e | |
1988 | 24.98 | b | 36.04 | c | 40.96 | e | 50.68 | e | 55.15 | e | 69.96 | g | 75.25 | e | 72.16 | f | 61.69 | d | 58.24 | 38.30 | j | 26.43 | b | 47.71 | c | |
1989 | 20.61 | 23.71 | b | 42.77 | 52.10 | 57.04 | g | 66.31 | d | 73.50 | f | 67.43 | c | 61.71 | a | 49.62 | a | 37.36 | a | 30.57 | d | 45.22 | b | |||
1990 | 31.56 | 29.43 | 42.88 | b | 54.76 | a | 53.97 | 64.28 | c | 74.17 | b | 72.07 | d | 67.00 | d | 51.02 | a | 36.70 | 18.59 | d | 49.70 | |||||
1991 | 27.16 | b | 40.84 | 39.06 | 45.43 | b | 52.30 | c | 59.84 | b | 73.36 | b | 71.71 | e | 64.55 | 52.90 | b | 40.36 | b | 30.29 | c | 49.82 | ||||
1992 | 31.83 | d | 40.22 | b | 44.97 | 53.83 | a | 64.90 | b | 66.56 | c | 70.82 | a | 72.63 | a | 63.62 | a | 54.15 | 37.80 | b | 26.19 | 52.29 | ||||
1993 | 18.03 | 26.17 | a | 44.73 | c | 47.31 | d | 59.45 | b | 59.76 | a | 64.55 | c | 67.91 | c | 61.66 | a | 52.09 | c | 31.98 | b | 30.50 | d | 47.01 | ||
1994 | 33.54 | c | 31.66 | c | 45.34 | b | 49.31 | c | 58.29 | 65.78 | e | 76.12 | c | 72.55 | c | 64.34 | e | 49.28 | h | 28.43 | b | 21.40 | e | 49.71 | a | |
1995 | 33.43 | c | 43.06 | d | 41.39 | i | ----- | z | 54.35 | d | 60.56 | c | 70.02 | c | 70.23 | i | 62.43 | c | 52.14 | f | 41.72 | g | 33.48 | f | 53.97 | f |
1996 | 31.17 | e | 35.82 | g | 41.83 | e | 47.65 | f | 52.73 | r | 63.94 | e | 73.90 | b | 71.24 | b | 60.84 | e | 49.06 | e | 41.02 | c | 34.48 | f | 54.12 | d |
1997 | 30.24 | f | 35.35 | d | 44.05 | b | 45.88 | d | ----- | z | 63.30 | b | 70.83 | a | 70.75 | c | 61.93 | h | 49.55 | i | 40.50 | e | 29.65 | d | 50.04 | d |
1998 | 34.79 | e | 33.96 | c | 41.06 | e | 44.87 | c | 52.48 | e | ----- | z | 76.48 | d | 74.10 | e | 63.48 | g | 48.71 | c | 38.14 | e | 26.21 | b | 47.08 | b |
1999 | 32.67 | g | 36.68 | f | 41.71 | g | 44.58 | f | 54.81 | d | 66.19 | f | 72.46 | f | 71.21 | g | 61.20 | c | 51.79 | c | 41.38 | f | 29.46 | e | 49.32 | h |
2000 | 31.28 | a | 36.50 | 41.26 | b | 50.94 | d | 55.05 | k | 64.48 | e | 71.23 | c | 71.24 | h | 60.30 | b | 47.91 | c | 31.95 | h | 30.00 | s | 50.49 | d | |
2001 | 25.30 | c | 31.61 | f | 43.64 | b | 45.08 | f | 60.77 | a | 62.68 | k | 66.70 | d | 69.80 | d | 61.52 | b | 52.56 | d | 36.54 | f | 26.80 | d | 50.88 | d |
2002 | 28.34 | b | 34.54 | e | 35.57 | i | 48.39 | h | 53.75 | i | 65.71 | k | 75.34 | i | 67.11 | i | ----- | z | 47.02 | h | 36.34 | b | 34.68 | c | 33.48 | h |
2003 | 38.55 | a | 32.50 | 42.84 | 42.75 | j | 60.76 | j | 66.32 | b | 74.98 | b | 69.65 | a | 61.98 | f | 53.19 | b | 31.52 | b | 30.48 | g | 51.19 | d | ||
2004 | 23.91 | c | 26.88 | i | 47.04 | d | 50.85 | c | 54.26 | f | 66.05 | b | 72.62 | c | ----- | z | 59.90 | d | 50.00 | b | 35.43 | c | 29.42 | e | 48.36 | c |
2005 | 19.33 | a | 28.71 | b | 42.46 | c | 46.15 | c | 54.25 | e | 59.37 | d | 74.10 | a | 70.16 | f | 55.84 | b | ----- | z | 34.96 | e | 27.56 | e | 44.27 | b |
2006 | 33.15 | e | 32.62 | g | 36.28 | b | 44.54 | e | 56.64 | b | 64.67 | f | 74.31 | b | ----- | z | 60.92 | q | 47.88 | j | 36.74 | c | 24.73 | e | 43.77 | e |
2007 | 25.52 | a | ----- | z | 45.32 | a | 46.78 | a | 58.77 | 66.57 | a | 75.73 | c | 70.16 | b | 58.64 | a | 47.15 | a | 38.87 | d | 26.84 | i | 53.35 | b | |
2008 | 20.35 | e | 30.75 | g | 38.57 | b | 43.48 | a | 53.57 | c | 62.68 | b | 72.39 | c | 70.48 | a | ----- | z | 48.58 | 41.38 | e | 24.47 | a | 47.60 | b | |
2009 | 27.75 | g | 35.08 | d | 38.68 | a | 46.00 | b | 59.12 | b | 62.16 | b | 72.45 | ----- | z | 64.02 | 45.39 | 37.15 | c | 21.06 | d | 48.11 | b | |||
2010 | 30.78 | f | 35.04 | d | 39.48 | e | ----- | z | 48.27 | a | 62.64 | a | 70.95 | a | 67.43 | b | 60.46 | d | 50.94 | g | 34.28 | a | 33.13 | a | 50.19 | c |
2011 | 27.90 | a | 31.06 | b | 39.73 | a | 42.53 | a | 50.65 | a | ----- | z | ----- | z | 71.27 | a | 65.09 | b | 51.07 | b | 34.31 | a | ----- | z | 45.96 | c |
2012 | 30.57 | b | 34.04 | d | 42.95 | 49.69 | a | ----- | z | 63.38 | 73.32 | 72.07 | a | 63.71 | a | 50.00 | a | 40.83 | a | 28.95 | a | 49.96 | a | |||
2013 | 14.59 | b | 33.96 | 43.24 | 48.20 | 55.48 | a | 66.03 | a | 75.63 | d | 70.38 | a | 62.17 | 45.33 | a | 39.03 | 22.07 | b | 48.01 | ||||||
2014 | 32.65 | 38.80 | 42.40 | 48.19 | a | 56.95 | 65.40 | a | 75.98 | 69.39 | 63.77 | 52.40 | 38.50 | 34.13 | a | 51.55 | ||||||||||
2015 | 34.08 | a | 40.54 | 45.58 | a | 47.12 | 55.83 | a | 70.48 | 70.27 | 71.15 | a | 62.12 | 54.50 | 34.73 | 27.89 | 51.19 | |||||||||
2016 | 25.05 | 34.98 | 42.55 | 50.75 | 54.65 | 66.47 | 70.87 | 69.97 | a | 59.03 | 49.39 | 40.37 | 23.37 | 48.95 | ||||||||||||
2017 | 21.32 | 34.77 | 42.87 | 44.85 | 55.66 | 64.60 | 72.95 | 72.35 | 59.70 | 45.47 | 40.22 | 26.23 | 48.42 | |||||||||||||
2018 | 34.95 | 29.00 | 37.02 | 47.03 | 56.90 | 63.68 | 74.13 | 69.60 | 60.47 | 47.32 | 34.52 | 26.55 | 48.43 | |||||||||||||
2019 | 27.32 | 28.09 | 39.02 | 48.02 | b | 52.11 | 63.00 | 70.67 | e | 69.79 | e | 57.91 | b | 40.24 | 36.30 | o | 30.17 | h | 49.62 | b | ||||||
2020 | 31.50 | m | 34.14 | a | 39.22 | b | 46.85 | 55.71 | 61.68 | e | 68.69 | m | 70.38 | n | 60.50 | m | 47.32 | n | 35.95 | t | 25.00 | n | 47.52 | g | ||
2021 | 29.56 | o | 28.00 | o | 35.79 | e | 44.73 | d | 51.67 | d | 70.04 | g | 75.57 | x | ----- | z | 61.48 | a | 47.50 | d | 39.50 | a | 26.98 | b | 43.95 | e |
2022 | 30.05 | a | 31.80 | a | 38.97 | a | 40.33 | 49.79 | 66.94 | v | 73.02 | e | ----- | z | 59.55 | k | 49.67 | m | 31.19 | d | 25.62 | o | 42.16 | e | ||
2023 | 29.56 | w | 30.00 | t | ----- | z | 41.27 | s | 56.59 | o | ----- | z | 73.65 | 70.45 | a | 60.58 | 49.13 | 37.27 | 32.48 | 53.93 | f | |||||
2024 | 32.58 | 36.50 | 40.62 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.57 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 27.98 | 34.35 | 40.74 | 46.86 | 54.84 | 63.92 | 71.94 | 69.21 | 60.83 | 49.21 | 36.73 | 28.29 | 49.06 | |||||||||||||
S.D. | 5.42 | 4.21 | 2.90 | 3.48 | 3.27 | 2.97 | 2.60 | 2.58 | 2.88 | 3.45 | 2.96 | 3.97 | 1.68 | |||||||||||||
SKEW | -0.42 | -0.19 | 0.04 | 0.03 | 0.47 | -0.04 | -0.54 | -0.72 | -0.29 | -0.10 | -0.55 | -0.20 | 0.53 | |||||||||||||
MAX | 38.55 | 43.28 | 47.04 | 54.76 | 64.90 | 70.48 | 76.48 | 74.10 | 67.00 | 58.24 | 41.38 | 35.87 | 52.29 | |||||||||||||
MIN | 14.59 | 23.71 | 35.28 | 38.69 | 48.18 | 58.22 | 64.55 | 62.81 | 54.80 | 40.24 | 28.43 | 18.59 | 46.56 | |||||||||||||
YRS | 53 | 50 | 51 | 46 | 44 | 48 | 49 | 41 | 47 | 49 | 45 | 45 | 14 |