YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.00 | 48.97 | a | 36.75 | 26.03 | 42.94 | h | |||
1942 | 15.12 | a | 24.30 | 35.27 | 51.65 | 57.03 | 68.35 | 75.13 | 73.00 | 63.32 | 56.15 | 41.38 | 26.80 | a | 48.96 | |||||||||||
1943 | 24.00 | a | 28.61 | 39.37 | 55.00 | 56.77 | 66.82 | 75.08 | 73.11 | 67.68 | 54.76 | j | 33.98 | 24.72 | a | 49.56 | a | |||||||||
1944 | 5.77 | 15.18 | a | 30.53 | a | 46.23 | 61.85 | a | 70.90 | 73.10 | a | 71.71 | 63.30 | 59.85 | 32.74 | a | ----- | z | 48.29 | a | ||||||
1945 | 26.35 | ----- | z | 47.21 | ----- | z | 49.19 | ----- | z | 71.22 | h | ----- | z | ----- | z | ----- | z | 31.78 | 19.15 | 34.74 | g | |||||
1946 | 16.05 | 31.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.20 | g | ----- | z | ----- | z | ----- | z | 23.93 | j | ||
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 | 72.29 | s | 63.82 | b | 49.18 | c | 29.71 | a | 27.98 | 42.67 | h | |
1956 | 27.65 | a | 20.57 | h | 38.60 | b | 49.00 | b | 61.79 | g | 71.58 | 74.82 | a | 69.69 | b | 59.81 | n | 50.63 | 29.83 | a | 11.47 | 47.03 | c | |||
1957 | 9.63 | 13.32 | c | 38.85 | d | 46.62 | a | 55.85 | d | 66.25 | b | 74.08 | f | 70.58 | e | 58.68 | h | 48.67 | d | 31.13 | d | 25.19 | g | 42.32 | c | |
1958 | 20.80 | d | 35.24 | i | 36.33 | g | 43.88 | j | 62.16 | c | 68.83 | j | 71.97 | b | 73.83 | b | 62.27 | d | 50.35 | a | 39.58 | k | 29.48 | g | 56.89 | f |
1959 | 25.04 | d | 29.67 | b | 38.60 | g | 50.08 | f | 57.48 | g | 70.78 | a | 73.72 | a | 71.10 | g | 59.65 | c | 47.09 | d | 33.11 | h | 23.67 | g | 50.99 | f |
1960 | 11.07 | c | 11.76 | b | 36.12 | a | 50.14 | a | 58.74 | b | 68.12 | f | 74.66 | b | 70.74 | b | 65.30 | c | 50.08 | g | 35.31 | d | 20.88 | c | 43.47 | b |
1961 | 20.24 | 30.50 | b | 38.74 | d | 48.40 | a | 59.22 | b | 71.28 | 74.66 | c | 73.47 | a | 55.64 | a | 47.48 | f | 29.60 | e | 18.13 | a | 47.26 | a | ||
1962 | 8.03 | a | 25.41 | a | 31.42 | a | 53.30 | b | 59.22 | b | 68.02 | b | 73.57 | a | 70.48 | d | 62.94 | c | 51.30 | a | 37.26 | c | 22.50 | d | 46.95 | |
1963 | 9.33 | a | 34.60 | b | 37.55 | c | 46.88 | a | 61.72 | a | 65.94 | f | 74.29 | c | 72.60 | e | 64.25 | b | 53.67 | e | 35.33 | d | 17.53 | b | 46.16 | a |
1964 | 18.40 | a | 23.56 | c | 31.08 | e | 47.69 | a | 58.23 | 65.50 | c | 76.50 | d | 70.36 | b | 60.72 | 49.89 | 25.54 | b | 13.98 | b | 45.12 | ||||
1965 | 14.34 | c | 18.91 | 29.84 | 49.30 | 56.58 | 63.76 | a | 72.58 | 69.68 | 54.32 | 49.69 | 39.86 | b | 25.56 | g | 47.17 | a | ||||||||
1966 | 15.90 | a | 23.16 | 38.29 | b | 49.86 | b | 61.97 | n | 67.93 | a | 75.70 | a | 71.53 | a | 63.41 | a | 46.43 | c | 37.27 | 10.64 | b | 45.47 | a | ||
1967 | 7.95 | 14.46 | 40.22 | b | 45.88 | b | 57.29 | g | 63.25 | 74.57 | a | 72.45 | 62.55 | 48.73 | 36.39 | b | 9.65 | a | 43.28 | a | ||||||
1968 | 2.21 | ----- | z | 40.22 | a | 44.11 | b | 57.13 | 69.15 | 74.82 | 67.52 | 59.22 | 49.73 | 34.33 | a | 17.12 | a | 46.87 | a | |||||||
1969 | 24.02 | 23.68 | 30.06 | 51.10 | a | 64.00 | 65.83 | d | 75.07 | a | 75.10 | b | 65.25 | d | 42.87 | 33.33 | a | 25.34 | c | 47.97 | ||||||
1970 | 16.33 | a | 33.91 | 37.85 | d | 42.96 | f | 60.71 | c | 64.03 | l | 74.81 | g | 75.78 | b | 59.97 | a | 45.65 | n | 37.54 | e | 23.59 | b | 43.21 | d | |
1971 | 22.16 | b | 31.04 | c | 37.43 | c | 48.43 | 57.32 | 68.88 | 75.68 | 75.05 | 59.22 | 46.17 | b | 23.25 | 16.02 | a | 46.72 | ||||||||
1972 | 25.52 | b | 32.34 | 46.40 | b | 51.23 | 60.36 | c | 69.59 | a | 75.63 | 72.94 | 62.35 | d | 51.40 | a | 34.20 | 8.24 | h | 52.90 | a | |||||
1973 | -0.83 | a | 9.32 | 33.55 | b | 47.09 | b | 59.03 | b | 67.77 | 73.27 | 73.34 | b | 61.38 | 51.50 | b | 32.19 | c | 15.15 | a | 43.56 | |||||
1974 | 3.62 | a | 8.09 | 42.29 | b | 47.40 | 62.25 | c | 71.32 | 75.43 | d | 70.95 | b | 62.92 | 51.97 | 37.12 | d | 23.00 | c | 46.36 | ||||||
1975 | 15.35 | a | 24.21 | b | 40.71 | c | 43.54 | c | 55.29 | g | 64.43 | 75.85 | 70.37 | a | 62.90 | e | 46.88 | e | 32.81 | a | 16.40 | b | 44.86 | a | ||
1976 | 12.90 | b | 25.07 | b | 37.11 | d | 49.22 | 60.84 | c | 67.35 | 77.34 | 71.35 | h | 64.48 | a | 47.11 | 38.58 | k | 22.77 | c | 46.42 | b | ||||
1977 | 20.89 | 29.21 | b | 37.48 | 53.33 | a | 57.84 | 74.39 | b | 75.37 | 73.35 | a | 64.29 | b | 50.55 | 36.81 | i | 31.15 | d | 51.62 | a | |||||
1978 | 20.29 | b | 20.98 | 41.76 | h | 52.60 | o | 55.87 | l | 68.60 | j | 76.41 | n | 71.31 | g | 60.32 | m | 50.78 | m | 30.18 | m | 6.77 | r | 20.64 | j | |
1979 | 2.28 | a | 9.83 | a | 30.33 | a | 49.32 | e | 58.77 | c | 69.54 | f | 74.68 | f | 70.72 | f | 67.00 | i | 51.21 | g | 27.77 | f | 22.67 | p | 30.11 | g |
1980 | 22.04 | d | 21.23 | c | 38.25 | k | 49.40 | d | 57.53 | a | 68.30 | c | 75.74 | b | 70.79 | b | 62.52 | d | 48.48 | f | 36.63 | k | 33.10 | k | 53.44 | d |
1981 | 28.95 | j | 33.63 | i | 41.89 | d | 53.98 | i | 58.14 | i | 71.90 | o | 75.52 | g | 72.11 | l | 66.35 | f | 48.81 | j | 37.63 | d | 27.85 | e | 35.79 | i |
1982 | 18.46 | g | 26.15 | b | 40.42 | f | 46.56 | e | 57.16 | i | 66.64 | i | 74.61 | h | 74.02 | i | 63.12 | e | 46.27 | p | 32.59 | g | 24.22 | m | 45.28 | i |
1983 | 20.94 | f | 27.40 | d | 41.54 | e | 45.17 | g | 55.16 | i | 66.81 | c | 74.89 | c | 77.07 | h | 65.57 | i | 52.00 | d | 33.20 | e | 15.87 | l | 49.31 | f |
1984 | 1.21 | c | 7.02 | 29.78 | b | 47.43 | a | 61.48 | d | 67.59 | g | 76.32 | c | 74.28 | h | 63.31 | i | 48.54 | d | 33.17 | f | 14.31 | b | 35.76 | d | |
1985 | 4.69 | b | 7.34 | c | 32.39 | c | 53.68 | b | 61.26 | b | 67.97 | o | 74.91 | b | 73.33 | e | 59.04 | e | 49.70 | d | 35.34 | a | 19.18 | n | 45.17 | b |
1986 | 14.33 | g | 34.21 | 47.32 | c | 50.45 | 59.10 | b | 72.38 | e | 73.52 | c | 73.84 | c | 60.48 | d | 50.90 | f | 36.48 | h | 27.78 | o | 58.91 | d | ||
1987 | 19.61 | m | 32.70 | f | 37.42 | g | 52.13 | g | 58.94 | e | 69.60 | f | 72.09 | d | 70.98 | i | 62.66 | b | 52.07 | d | 36.28 | a | 22.54 | f | 56.41 | g |
1988 | 8.16 | f | 17.18 | a | 35.43 | d | 53.58 | e | 59.48 | g | 72.44 | d | 76.10 | e | 72.73 | c | 60.59 | g | 55.33 | g | 37.52 | i | 19.57 | c | 49.58 | e |
1989 | 8.82 | a | 14.20 | f | 43.52 | a | 56.98 | h | 59.90 | b | 67.80 | 78.19 | 71.53 | 63.91 | b | 49.85 | d | 36.21 | f | 22.72 | f | 55.44 | d | |||
1990 | 21.87 | e | 22.27 | f | 41.36 | c | 55.37 | 58.84 | c | 71.67 | d | 76.81 | b | 75.17 | e | 67.02 | b | 50.10 | f | 34.82 | e | 11.84 | b | 51.48 | b | |
1991 | 6.80 | c | 20.48 | c | 40.06 | e | 48.08 | f | 60.48 | g | 71.06 | f | 74.87 | d | 73.93 | d | 63.94 | l | 49.28 | f | 33.48 | g | 21.52 | e | 39.61 | f |
1992 | 11.31 | e | 28.09 | f | 45.33 | d | 57.31 | d | 63.96 | f | 68.70 | g | 71.40 | g | 72.62 | f | 63.79 | k | 50.85 | r | 31.98 | c | 18.29 | l | 36.48 | h |
1993 | 17.75 | g | 17.73 | f | 33.66 | c | 48.98 | i | 61.48 | e | 65.52 | i | 71.25 | g | 69.70 | i | 59.64 | h | 47.60 | j | 27.16 | e | 20.68 | 35.74 | h | |
1994 | 27.80 | a | 28.82 | 43.53 | b | 52.98 | e | 64.21 | g | 73.79 | d | 78.20 | d | 75.06 | f | ----- | z | 48.24 | d | 30.90 | a | 27.19 | 45.72 | c | ||
1995 | 24.76 | 35.87 | a | 43.36 | f | 47.32 | b | 54.79 | e | 65.48 | i | 73.37 | a | 75.21 | b | 64.18 | e | 48.80 | f | 38.91 | a | 28.11 | 49.17 | c | ||
1996 | 20.73 | a | 28.18 | a | 40.57 | d | 49.16 | e | 62.00 | d | 70.66 | e | 77.00 | a | 74.19 | d | 61.21 | d | 47.11 | c | 35.24 | a | 23.71 | c | 49.15 | |
1997 | 16.57 | d | 17.87 | a | 36.93 | a | 45.61 | g | 62.09 | d | 70.58 | f | 74.50 | h | 72.60 | e | 63.65 | c | 48.83 | d | 33.67 | c | 22.25 | a | 41.61 | c |
1998 | 27.91 | c | 33.23 | b | 40.98 | d | 48.23 | b | 60.39 | c | 65.65 | 77.55 | a | 72.43 | a | 66.17 | d | 49.63 | e | 36.15 | c | 15.02 | e | 49.45 | ||
1999 | 21.54 | c | 31.38 | c | 42.97 | a | 45.85 | f | 57.04 | e | 67.62 | f | 75.70 | c | 72.24 | d | 61.46 | f | 49.33 | h | 38.24 | g | 23.82 | c | 46.38 | e |
2000 | 28.24 | j | 34.17 | h | 41.74 | f | 53.20 | h | 62.91 | i | 70.74 | g | 75.07 | d | 75.70 | f | 62.30 | h | 50.87 | h | 29.38 | e | 25.96 | g | 52.23 | j |
2001 | 21.56 | d | 29.50 | e | 44.31 | g | 52.30 | g | 61.74 | f | 72.69 | f | 76.84 | f | 74.62 | f | 66.35 | d | 50.75 | e | 37.66 | e | 13.59 | d | 36.57 | f |
2002 | 14.29 | e | 21.25 | f | 38.04 | f | 52.88 | e | 61.50 | d | 72.48 | f | 78.72 | h | 71.93 | i | 63.12 | i | 47.20 | h | 32.43 | g | 19.10 | e | 36.94 | h |
2003 | 17.44 | d | 27.93 | f | 42.64 | f | 50.33 | f | 61.88 | g | 69.11 | h | 80.79 | b | 75.80 | h | 61.81 | i | 53.69 | e | 29.87 | d | 23.46 | f | 45.45 | h |
2004 | 11.45 | c | 21.58 | d | 47.02 | c | 53.52 | f | 61.70 | h | 69.00 | f | 74.13 | d | 70.15 | g | 63.36 | h | 51.36 | i | 36.69 | i | 25.60 | 35.95 | g | |
2005 | 26.52 | a | 32.70 | 42.06 | 49.40 | d | 60.93 | a | 66.05 | 77.50 | 71.93 | b | 62.83 | a | 53.30 | a | 37.45 | 25.06 | 50.48 | |||||||
2006 | 27.48 | f | 30.88 | 39.93 | a | 53.26 | a | 63.16 | 73.05 | 79.32 | a | 71.68 | 59.43 | b | 49.18 | 37.31 | c | 21.81 | 52.64 | a | ||||||
2007 | 3.12 | b | 26.80 | 44.90 | 53.05 | 61.94 | 72.22 | 79.02 | 75.77 | a | 63.05 | 49.34 | 36.23 | 8.60 | 47.84 | |||||||||||
2008 | 2.95 | 15.09 | 34.39 | 44.93 | b | 56.87 | 68.38 | a | 76.73 | 74.37 | 61.91 | a | 49.39 | 38.53 | 18.33 | a | 45.16 | |||||||||
2009 | 13.32 | 28.70 | 41.50 | 49.57 | 62.90 | 66.18 | 76.58 | 72.02 | 65.53 | 47.27 | 35.97 | 5.74 | 47.11 | |||||||||||||
2010 | 10.26 | 14.57 | 37.34 | 49.89 | b | 55.35 | 71.17 | 76.76 | 72.61 | 64.23 | 52.32 | 34.93 | 28.98 | 47.37 | ||||||||||||
2011 | 7.42 | 12.62 | 38.00 | a | 49.22 | 54.95 | a | 68.20 | 74.81 | 75.35 | 65.75 | 50.10 | 34.72 | ----- | z | 48.29 | a | |||||||||
2012 | 24.60 | 32.19 | 44.92 | a | 54.33 | a | 62.85 | a | ----- | z | 77.08 | 75.45 | 64.58 | 50.94 | 38.17 | 21.27 | 49.67 | a | ||||||||
2013 | 0.29 | 13.39 | 37.31 | 47.63 | 60.74 | 72.53 | 78.95 | 73.78 | a | 65.60 | 47.97 | 34.88 | 4.90 | 44.83 | ||||||||||||
2014 | 12.71 | 31.38 | 44.00 | 50.93 | 60.95 | 69.48 | 78.05 | 70.89 | 65.32 | 51.79 | 34.00 | 29.47 | 49.91 | |||||||||||||
2015 | 25.48 | 38.07 | 46.47 | 51.19 | a | 58.39 | 73.93 | 73.47 | 74.08 | 65.18 | 56.40 | 35.62 | 17.69 | 51.33 | ||||||||||||
2016 | 15.50 | 26.05 | 43.85 | 52.52 | 58.48 | 74.08 | 75.73 | 71.94 | 63.52 | 53.21 | 40.03 | 24.55 | 49.95 | |||||||||||||
2017 | 16.98 | 30.75 | 46.77 | 49.90 | 59.85 | 73.60 | a | 78.10 | 73.76 | 64.30 | 47.60 | 40.42 | 27.39 | 50.79 | ||||||||||||
2018 | 26.84 | 32.82 | 42.98 | 51.97 | 63.71 | 73.23 | 79.35 | 73.98 | 66.68 | 49.47 | 32.05 | 24.45 | 51.46 | |||||||||||||
2019 | 15.53 | 15.23 | 34.79 | 52.70 | 55.65 | 68.28 | 78.05 | 76.00 | 66.25 | 43.16 | 36.10 | 26.45 | 47.35 | |||||||||||||
2020 | 14.58 | 25.97 | 44.00 | 50.91 | b | 63.00 | 69.80 | 76.63 | 77.29 | 63.25 | 50.26 | 35.47 | 17.00 | 49.01 | ||||||||||||
2021 | 12.77 | 29.59 | 42.40 | 50.47 | 62.15 | 73.77 | 80.06 | 73.10 | 65.00 | 49.48 | 40.05 | 29.31 | 50.68 | |||||||||||||
2022 | 26.56 | 25.38 | 41.08 | 50.95 | 59.00 | a | 71.68 | 78.90 | 75.65 | 67.28 | 50.40 | 30.42 | 14.37 | 49.31 | ||||||||||||
2023 | 13.90 | 6.62 | 27.73 | 47.03 | 61.53 | 67.93 | 78.53 | 75.34 | 64.50 | 50.05 | 35.17 | 26.60 | a | 46.24 | ||||||||||||
2024 | 27.94 | 34.81 | 42.89 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.21 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.67 | 24.00 | 39.16 | 49.98 | 59.52 | 69.50 | 75.96 | 72.97 | 63.14 | 50.02 | 34.56 | 20.48 | 48.12 | |||||||||||||
S.D. | 8.15 | 8.51 | 5.06 | 2.94 | 2.79 | 2.99 | 2.03 | 1.96 | 2.70 | 2.92 | 3.68 | 6.40 | 2.18 | |||||||||||||
SKEW | -0.23 | -0.52 | -0.39 | 0.10 | -0.96 | -0.13 | 0.24 | -0.22 | -0.97 | 0.55 | -0.71 | -0.51 | -0.26 | |||||||||||||
MAX | 27.94 | 38.07 | 47.32 | 57.31 | 64.00 | 74.39 | 80.79 | 77.29 | 67.68 | 59.85 | 41.38 | 31.15 | 51.46 | |||||||||||||
MIN | -0.83 | 6.63 | 27.73 | 43.54 | 49.19 | 63.25 | 71.97 | 67.52 | 54.32 | 42.87 | 23.25 | 4.90 | 43.56 | |||||||||||||
YRS | 65 | 61 | 62 | 55 | 55 | 48 | 60 | 54 | 56 | 53 | 58 | 55 | 25 |