YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 86.25 | w | 80.45 | 66.43 | 47.35 | 26.20 | 30.42 | 50.17 | g | |||||
1960 | 18.00 | 23.86 | 27.50 | a | 49.87 | 67.71 | 72.77 | 79.77 | a | 79.62 | b | 67.90 | 56.58 | 37.47 | 18.29 | 49.94 | ||||||||||
1961 | 16.60 | a | 28.61 | 40.61 | 46.00 | b | 65.93 | b | 81.00 | 80.36 | c | 82.52 | b | 65.17 | 57.17 | b | 35.79 | a | 17.14 | b | 51.41 | |||||
1962 | 9.65 | 15.89 | 34.94 | 48.07 | b | 63.27 | a | 75.24 | e | 75.68 | c | 78.23 | a | 65.27 | 59.61 | 39.53 | 23.42 | 49.07 | ||||||||
1963 | 7.42 | 17.63 | a | 41.28 | b | 54.37 | 63.74 | 77.60 | 80.97 | a | 77.52 | 71.23 | 68.35 | 41.40 | 12.57 | c | 51.17 | |||||||||
1964 | 22.50 | a | 26.03 | 30.13 | 54.10 | a | 70.57 | a | 73.03 | a | 81.65 | 72.70 | a | 65.10 | 55.53 | a | 36.11 | b | 13.55 | 50.08 | ||||||
1965 | 10.77 | a | 18.54 | 25.61 | 49.80 | e | 64.57 | a | 73.14 | b | 75.41 | b | 77.52 | b | 56.13 | 56.50 | a | 33.60 | 27.45 | b | 47.42 | |||||
1966 | 2.88 | e | 18.19 | l | ----- | z | ----- | z | 72.00 | y | 75.37 | c | 82.15 | e | 74.33 | a | 67.59 | c | 55.41 | b | 30.59 | a | 20.77 | 51.14 | d | |
1967 | 17.40 | a | 15.79 | 34.74 | 48.07 | a | 59.23 | 72.07 | a | 78.31 | b | 77.06 | 70.97 | 51.84 | 35.14 | a | ----- | z | 50.96 | a | ||||||
1968 | 15.65 | 18.34 | 42.77 | 54.17 | 62.48 | 72.21 | a | 76.10 | a | 73.23 | a | 67.30 | 55.77 | 35.37 | 17.32 | 49.23 | ||||||||||
1969 | 10.00 | 23.57 | 32.03 | a | 56.57 | 66.45 | 66.18 | b | 77.93 | a | 82.74 | 67.23 | 46.33 | a | 37.60 | 24.32 | 49.25 | |||||||||
1970 | 9.81 | 19.08 | b | 29.06 | 46.62 | a | 61.52 | 76.93 | 82.20 | a | 79.10 | a | 67.67 | 54.79 | c | 28.22 | l | 17.00 | b | 49.43 | a | |||||
1971 | 6.81 | 22.46 | 32.83 | b | 52.07 | 63.72 | b | 76.40 | 74.10 | 77.70 | a | 67.14 | a | 55.53 | a | 34.70 | c | 19.90 | b | 48.61 | ||||||
1972 | 8.00 | a | 15.25 | a | 31.87 | 48.21 | a | 71.00 | a | 75.77 | d | 73.97 | a | 78.74 | 63.50 | 50.97 | ----- | z | ----- | z | 51.73 | b | ||||
1973 | 23.10 | 25.18 | 43.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.29 | j | 32.83 | 18.10 | 28.58 | g | |||||
1974 | 11.71 | 23.04 | 30.84 | 50.93 | 58.94 | 76.79 | a | 82.81 | 72.90 | a | 63.70 | 57.52 | 35.13 | ----- | z | 51.30 | a | |||||||||
1975 | 18.52 | f | 21.58 | b | 27.74 | 42.90 | 70.08 | e | 71.73 | 78.77 | 72.46 | g | 62.17 | a | 55.07 | b | 38.87 | 18.56 | d | 48.75 | b | |||||
1976 | 13.90 | a | 29.86 | 29.48 | 57.21 | a | 66.42 | g | 78.37 | 82.83 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.76 | g | |||
1977 | 15.42 | s | 25.79 | 40.87 | 56.55 | j | 79.29 | j | 77.94 | n | 81.71 | c | 72.23 | a | 64.60 | 57.18 | c | 34.76 | a | 14.57 | a | 48.96 | d | |||
1978 | 9.64 | f | 16.36 | 31.39 | 48.57 | 73.21 | g | 74.50 | 76.77 | 79.52 | 69.33 | 55.26 | 29.63 | 14.65 | 49.60 | b | ||||||||||
1979 | 1.71 | 11.25 | 33.96 | c | 45.10 | ----- | z | 76.05 | j | 80.29 | 74.35 | 70.50 | 49.26 | 32.33 | 29.10 | 42.79 | b | |||||||||
1980 | 13.60 | a | 17.91 | f | 30.65 | 61.00 | a | 74.77 | 76.27 | 82.67 | a | 75.35 | 65.27 | 49.87 | 40.59 | h | 16.70 | a | 54.61 | b | ||||||
1981 | 20.45 | 27.29 | 44.48 | 55.30 | 67.83 | a | 71.14 | a | 79.00 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.75 | f | ||||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.58 | f | 52.90 | j | 33.62 | f | 28.33 | j | ----- | z |
1983 | 22.69 | e | 28.92 | c | 37.61 | c | 52.68 | e | 64.12 | f | 73.88 | f | 84.88 | f | 81.40 | k | 62.60 | j | 52.16 | f | 34.75 | f | 7.84 | f | 35.47 | h |
1984 | 16.33 | d | 33.62 | e | 31.63 | d | 57.19 | c | 65.68 | c | 74.96 | b | 81.31 | e | 83.07 | d | 64.92 | f | 55.42 | g | 36.12 | e | 18.89 | c | 49.88 | b |
1985 | 17.42 | e | 19.81 | a | 40.18 | c | 59.00 | g | 70.41 | b | 68.67 | c | 77.78 | h | 72.39 | h | 63.24 | i | 54.50 | k | 25.48 | g | 11.29 | g | 43.30 | g |
1986 | 23.19 | j | 21.00 | c | 44.69 | e | 56.31 | d | 72.70 | h | 74.21 | p | 79.68 | i | 76.28 | f | 65.39 | g | 56.88 | e | 30.12 | f | 29.72 | f | 44.72 | h |
1987 | 23.33 | d | 32.75 | d | 39.39 | c | 66.28 | e | 71.73 | e | 80.74 | g | 81.27 | e | 76.36 | f | 70.38 | d | 50.29 | g | 42.10 | i | 26.62 | b | 51.47 | d |
1988 | 14.04 | e | 18.60 | d | 34.57 | c | 57.35 | d | 75.08 | f | 84.88 | f | 85.48 | b | 82.52 | f | 67.50 | h | ----- | z | 36.56 | u | 21.64 | c | 38.61 | f |
1989 | 22.40 | f | 12.16 | c | 30.08 | f | 49.96 | d | 70.44 | d | 75.48 | e | 85.23 | e | 79.39 | 68.15 | q | 59.20 | a | 33.59 | a | 13.48 | b | 53.21 | c | |
1990 | 28.23 | 26.39 | 39.58 | 53.28 | a | 66.77 | 76.75 | b | 79.94 | 82.10 | 71.69 | a | 56.71 | 40.43 | 20.94 | 53.57 | ||||||||||
1991 | 13.32 | 30.00 | 40.67 | a | 58.57 | 70.04 | g | 78.23 | 78.81 | 81.29 | 65.73 | 50.37 | a | 28.87 | 26.58 | 50.22 | a | |||||||||
1992 | 25.48 | 29.59 | 38.39 | 48.23 | 69.81 | 71.60 | 72.58 | e | 73.68 | 66.25 | f | 54.58 | 31.14 | b | 19.18 | c | 48.57 | a | ||||||||
1993 | 18.03 | a | 22.42 | b | 36.83 | a | 52.20 | e | 66.22 | d | 70.96 | e | 72.87 | p | 74.29 | c | 62.46 | d | 49.04 | f | 32.50 | b | 22.96 | d | 45.89 | b |
1994 | 4.19 | e | 15.48 | c | 40.11 | d | 55.00 | h | 67.86 | j | 75.31 | a | 76.04 | f | 76.43 | h | 70.88 | f | 58.72 | f | 41.15 | d | 29.93 | c | 34.36 | f |
1995 | 18.90 | a | 20.42 | b | 37.54 | e | 47.81 | c | 65.64 | c | 81.43 | b | 77.92 | g | 79.21 | c | 64.23 | h | 52.75 | k | 25.46 | b | 17.39 | c | 43.76 | c |
1996 | 5.96 | e | 19.85 | c | 27.26 | d | 43.96 | f | 64.14 | c | 78.87 | g | 76.83 | b | 79.88 | e | 68.33 | f | 56.25 | k | 24.96 | b | 13.63 | d | 39.06 | d |
1997 | 11.92 | e | 23.30 | e | 32.11 | c | 50.67 | f | 61.50 | g | 78.32 | e | 79.44 | f | 77.30 | d | 72.62 | i | 51.88 | f | 30.41 | c | 30.07 | d | 40.49 | e |
1998 | 21.33 | g | 35.54 | b | 38.12 | f | 61.00 | e | 73.18 | n | 70.77 | d | 79.75 | g | 81.50 | e | 74.20 | e | 55.85 | e | 33.73 | d | 22.86 | c | 54.43 | d |
1999 | 15.23 | e | 31.61 | e | 40.30 | d | 56.04 | f | 64.56 | f | 75.80 | o | 81.96 | d | 77.08 | g | 65.58 | f | 54.88 | e | 45.48 | c | 29.96 | d | 42.78 | e |
2000 | 17.65 | e | 33.32 | d | 47.35 | h | 54.43 | g | 68.05 | i | 72.09 | g | 80.88 | e | 79.48 | f | 68.62 | i | 59.61 | h | 34.08 | e | 8.89 | c | 34.97 | g |
2001 | 24.76 | b | 16.41 | f | 38.31 | b | 53.08 | e | 66.86 | c | 71.56 | n | 77.00 | y | 81.08 | f | 69.50 | h | 51.86 | i | 47.86 | i | 28.22 | d | 42.25 | g |
2002 | 23.71 | c | 32.36 | c | 27.50 | e | 49.36 | e | 64.22 | h | 78.74 | g | 83.12 | f | 75.69 | e | 71.68 | h | 42.56 | d | 32.29 | f | 26.00 | d | 39.60 | e |
2003 | 15.67 | d | 19.14 | f | 35.40 | f | 57.10 | j | 68.78 | d | 75.21 | f | 80.04 | e | ----- | z | 66.92 | e | 53.62 | j | 32.18 | h | 28.68 | f | 57.85 | h |
2004 | 8.76 | f | 27.19 | h | 37.30 | d | 53.48 | a | 59.70 | h | 70.68 | h | 77.80 | f | 70.96 | h | 73.69 | a | 53.69 | e | 42.88 | e | 25.20 | a | 47.71 | f |
2005 | 13.00 | 27.50 | d | 34.22 | d | 59.74 | g | 63.71 | g | 75.09 | g | 81.16 | 76.12 | e | 73.28 | a | 57.48 | j | 36.91 | g | 24.29 | g | 50.88 | f | ||
2006 | 29.07 | a | 20.19 | a | 36.07 | b | 60.74 | g | 67.26 | 77.46 | f | 87.04 | e | 81.57 | h | 68.86 | a | 50.08 | g | 38.09 | g | 29.58 | 48.29 | e | ||
2007 | 20.88 | e | 12.64 | 39.29 | j | 51.70 | 70.46 | c | 76.00 | f | 81.93 | a | 77.43 | a | 70.21 | a | 56.90 | 36.77 | h | 18.52 | b | 51.19 | c | |||
2008 | 15.54 | g | 18.65 | f | 32.65 | h | 51.53 | k | 62.62 | g | 71.65 | d | 77.84 | f | 78.74 | d | ----- | z | 55.57 | h | 36.14 | h | 11.88 | g | 75.20 | j |
2009 | 9.04 | d | 21.77 | f | 34.41 | i | 50.67 | f | ----- | z | 72.29 | f | 72.67 | d | 74.81 | d | 75.28 | e | 45.62 | g | 45.08 | f | 15.40 | f | 57.95 | h |
2010 | 19.21 | g | 25.56 | c | 47.26 | h | 63.04 | g | 66.64 | f | 71.50 | j | 79.20 | f | 80.67 | g | 62.05 | h | 60.82 | i | 38.73 | h | 17.63 | d | 21.59 | j |
2011 | 12.50 | e | 20.70 | h | 31.80 | f | 50.17 | f | 63.71 | j | 71.67 | f | 81.12 | e | 80.09 | h | 71.68 | k | 59.15 | e | 39.38 | i | 32.17 | m | 50.92 | i |
2012 | 24.61 | h | 29.95 | h | 52.43 | h | 57.86 | h | 68.32 | f | 79.28 | l | 87.18 | i | 79.88 | f | 71.30 | 50.26 | 35.40 | 21.48 | 44.61 | h | ||||
2013 | 17.58 | 21.43 | 31.16 | 42.37 | 65.81 | 75.07 | 80.06 | 79.16 | 72.77 | 49.48 | 32.47 | 9.59 | b | 48.08 | ||||||||||||
2014 | 10.20 | a | 11.70 | e | 28.21 | b | 47.04 | b | 63.72 | b | 72.14 | b | 77.58 | 76.30 | a | 68.90 | a | 54.60 | a | 27.40 | 25.24 | b | 46.92 | |||
2015 | 18.48 | 13.11 | 40.17 | b | 57.89 | b | 63.54 | c | 75.62 | a | 80.12 | e | 76.61 | c | 73.71 | f | 58.00 | c | 42.27 | 28.94 | 50.43 | a | ||||
2016 | 18.19 | 26.52 | b | 45.71 | c | 50.00 | 69.03 | b | 74.96 | c | 78.81 | 79.38 | b | 70.60 | o | 54.77 | 47.57 | 19.25 | c | 51.29 | a | |||||
2017 | 19.97 | b | 28.64 | 36.42 | 54.10 | a | 64.10 | b | 75.18 | b | 80.87 | 76.55 | 69.96 | e | 56.72 | b | 31.10 | 16.87 | 50.87 | |||||||
2018 | 17.32 | c | 16.70 | a | 36.82 | c | 46.47 | 73.85 | e | 77.73 | 80.86 | b | 79.35 | 66.10 | 45.84 | 27.28 | a | 26.33 | a | 49.55 | ||||||
2019 | 12.50 | c | 13.82 | 32.30 | a | 50.83 | 60.68 | c | 75.43 | b | 80.93 | b | 76.27 | a | 66.57 | 48.00 | a | 29.41 | a | 22.50 | a | 47.44 | ||||
2020 | 20.03 | a | 25.10 | 38.65 | 48.00 | a | 63.45 | 76.50 | 82.00 | b | 78.67 | a | 68.10 | a | 44.90 | a | 40.53 | 27.29 | 51.10 | |||||||
2021 | 25.79 | b | 14.11 | 48.13 | a | 52.72 | a | 68.77 | 82.64 | b | 85.23 | 82.18 | c | 72.45 | a | 59.10 | a | 37.30 | 22.73 | a | 54.26 | |||||
2022 | 11.97 | 14.86 | 33.90 | a | 41.97 | a | 63.60 | a | 75.41 | a | 79.45 | 78.13 | 69.70 | c | 58.00 | 35.27 | 17.37 | a | 48.30 | |||||||
2023 | 20.87 | 25.43 | 31.52 | 46.53 | 73.10 | 78.47 | 77.29 | 77.68 | 72.90 | 54.48 | 37.30 | 32.84 | 52.37 | |||||||||||||
2024 | 19.26 | 33.69 | 36.84 | 53.95 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.93 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.81 | 22.61 | 35.67 | 51.64 | 66.64 | 75.00 | 79.85 | 77.79 | 68.19 | 54.21 | 34.80 | 21.42 | 49.93 | |||||||||||||
S.D. | 6.37 | 6.60 | 5.40 | 5.17 | 3.87 | 3.31 | 3.22 | 2.85 | 3.84 | 4.79 | 5.21 | 5.89 | 2.04 | |||||||||||||
SKEW | -0.10 | 0.08 | 0.16 | 0.42 | 0.09 | -0.13 | -0.32 | -0.08 | -0.55 | -0.18 | 0.23 | -0.03 | 0.53 | |||||||||||||
MAX | 29.07 | 35.54 | 48.13 | 66.28 | 74.77 | 82.64 | 87.04 | 83.07 | 75.28 | 68.35 | 47.57 | 32.84 | 54.26 | |||||||||||||
MIN | 1.71 | 11.25 | 25.61 | 41.97 | 58.94 | 66.18 | 72.58 | 72.23 | 56.13 | 42.56 | 24.96 | 8.89 | 46.92 | |||||||||||||
YRS | 54 | 55 | 53 | 46 | 40 | 42 | 46 | 45 | 41 | 43 | 44 | 51 | 19 |