YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.77 | 50.50 | 42.71 | 26.72 | a | 18.48 | 39.84 | g | ||||
1942 | 12.68 | i | 16.00 | h | 25.30 | h | 39.61 | b | 45.26 | 56.03 | a | 60.65 | 59.65 | 48.50 | b | 38.11 | d | 25.76 | i | 17.59 | i | 49.69 | e | |||
1943 | 17.67 | g | 20.36 | f | 20.25 | g | 40.62 | a | 43.79 | b | 57.81 | c | 62.67 | a | 64.19 | 47.89 | c | 32.46 | e | 22.43 | g | 14.65 | h | 49.92 | e | |
1944 | 14.45 | k | 21.48 | f | 23.12 | f | 33.50 | d | 47.73 | a | 57.00 | c | 60.52 | 60.94 | 49.36 | e | 39.08 | e | 27.96 | f | 18.04 | h | 49.73 | e | ||
1945 | 16.83 | g | 23.10 | g | 26.83 | h | 32.41 | c | 45.23 | a | 51.93 | 61.31 | b | 60.83 | a | 49.33 | c | 37.90 | 24.89 | b | 11.64 | f | 45.48 | d | ||
1946 | 14.72 | f | 22.65 | b | 31.92 | e | 42.38 | a | 44.35 | 57.40 | 61.13 | 60.23 | 51.73 | 38.00 | 19.97 | a | 22.87 | a | 41.15 | a | ||||||
1947 | 15.56 | d | 18.12 | d | 26.29 | c | 37.38 | a | 47.61 | 55.47 | 62.10 | 63.81 | 53.90 | a | 43.84 | 21.65 | d | 19.14 | j | 40.52 | a | |||||
1948 | 13.96 | g | 13.62 | h | 20.15 | d | 43.39 | b | 50.21 | c | 58.63 | 62.90 | 62.19 | 55.55 | a | 40.03 | 24.47 | 18.73 | a | 43.63 | b | |||||
1949 | 5.69 | e | 16.75 | 28.94 | 41.23 | 51.00 | 58.50 | 64.68 | 61.45 | 53.17 | 40.67 | a | 32.79 | a | 16.80 | a | 39.31 | |||||||||
1950 | 12.39 | 23.30 | a | 26.48 | 36.13 | 46.53 | a | 59.24 | a | 61.61 | 58.20 | a | 53.87 | 44.03 | a | 24.90 | 20.68 | 38.95 | ||||||||
1951 | 15.34 | b | 20.59 | a | 23.81 | 36.00 | 47.97 | a | 53.20 | 64.03 | 62.17 | a | 50.60 | 39.06 | 24.80 | 16.28 | b | 37.82 | ||||||||
1952 | 20.68 | 23.72 | 25.65 | 38.17 | a | 47.87 | 64.27 | 64.00 | 63.84 | 53.00 | 35.26 | 22.90 | 18.87 | 39.85 | ||||||||||||
1953 | 23.53 | a | 21.04 | 32.03 | 36.41 | a | 46.06 | 60.90 | 65.84 | 63.00 | 52.03 | 41.42 | 28.45 | a | 19.62 | b | 40.86 | |||||||||
1954 | 17.27 | a | 28.57 | 25.20 | a | 40.23 | 46.81 | 60.83 | 67.00 | 62.77 | 55.47 | 40.45 | 27.00 | 19.37 | a | 40.91 | ||||||||||
1955 | 17.61 | 15.29 | 25.19 | 40.10 | 51.13 | 57.20 | 66.00 | 64.42 | 55.28 | a | 40.80 | a | 23.47 | 19.20 | a | 39.64 | ||||||||||
1956 | 19.00 | a | 16.55 | 27.55 | 35.30 | 49.48 | 62.20 | 62.81 | 59.81 | 52.30 | 40.13 | 23.13 | 17.43 | a | 38.81 | |||||||||||
1957 | 11.48 | 24.82 | 29.48 | 36.77 | 47.77 | 54.47 | 63.87 | 61.68 | 49.30 | 43.10 | 29.77 | 23.94 | 39.70 | |||||||||||||
1958 | 19.32 | 25.14 | 25.63 | a | 37.40 | 53.65 | 60.87 | 61.45 | 62.00 | 55.27 | 39.42 | 25.27 | 22.29 | 40.64 | ||||||||||||
1959 | 13.77 | 21.71 | 27.13 | 36.73 | 50.84 | 60.10 | 60.77 | 61.35 | 49.77 | 37.32 | 22.93 | 22.19 | 38.72 | |||||||||||||
1960 | 11.42 | 11.59 | 24.39 | 42.23 | 46.58 | 56.87 | 60.32 | 60.94 | 51.33 | 39.97 | 25.63 | 17.52 | 37.40 | |||||||||||||
1961 | 16.10 | 22.64 | 30.17 | a | 35.87 | 48.27 | a | 57.21 | a | 60.65 | 61.68 | 47.47 | 35.37 | a | 25.67 | 14.87 | a | 37.99 | ||||||||
1962 | 7.23 | 23.25 | 23.35 | 40.27 | 49.81 | 56.30 | 61.77 | 59.03 | 50.50 | 38.61 | 26.33 | 20.32 | 38.06 | |||||||||||||
1963 | 4.84 | 22.14 | 29.48 | 38.50 | 49.65 | 59.13 | 64.23 | 62.06 | 57.07 | 45.29 | 26.23 | 12.35 | 39.25 | |||||||||||||
1964 | 16.13 | a | 18.07 | 22.16 | 35.80 | 47.74 | 56.60 | 64.87 | 58.81 | 51.67 | 34.42 | 27.21 | a | 18.16 | 37.64 | |||||||||||
1965 | 20.26 | 15.82 | 19.71 | 39.73 | 46.84 | 57.03 | 63.39 | 58.45 | 48.27 | 39.74 | 30.97 | 20.65 | 38.40 | |||||||||||||
1966 | 9.97 | 14.50 | 28.58 | 36.07 | 45.55 | 57.47 | 66.52 | 59.26 | 51.60 | 37.58 | 27.40 | 14.63 | a | 37.43 | ||||||||||||
1967 | 19.39 | 21.46 | 30.23 | 42.10 | 45.32 | 55.70 | 61.97 | 58.19 | 50.90 | 38.97 | 25.30 | 17.29 | 38.90 | |||||||||||||
1968 | 16.26 | 20.76 | 26.23 | 34.07 | 43.58 | 57.97 | 62.03 | a | 59.50 | a | 48.31 | a | 36.68 | 24.83 | 11.55 | 36.81 | ||||||||||
1969 | 17.69 | b | 21.04 | 19.00 | 42.17 | a | 50.48 | 54.07 | a | 63.47 | a | 62.68 | 53.69 | a | 35.87 | 24.83 | a | 20.26 | 38.77 | |||||||
1970 | 12.23 | 20.11 | 21.42 | 32.66 | a | 48.03 | 55.00 | 62.90 | 61.90 | 47.43 | 34.42 | 26.10 | 17.61 | 36.65 | ||||||||||||
1971 | 12.29 | 21.86 | 24.87 | 36.93 | 44.65 | 58.50 | 60.50 | a | 58.87 | a | 45.62 | a | 35.60 | a | 25.43 | 18.97 | a | 37.01 | ||||||||
1972 | 10.76 | b | 18.86 | 29.29 | 39.30 | 47.80 | a | 57.50 | 60.81 | 60.26 | 50.47 | 38.83 | b | 17.43 | 9.77 | 36.76 | ||||||||||
1973 | 15.10 | a | 20.71 | 30.87 | 33.20 | 46.45 | ----- | z | ----- | z | ----- | z | 48.10 | 37.00 | 24.93 | 14.23 | e | 30.07 | c | |||||||
1974 | 8.42 | 18.57 | g | 30.00 | 38.57 | 48.48 | 56.60 | 64.81 | 57.23 | 46.77 | 41.42 | 26.52 | c | 13.12 | g | 41.88 | b | |||||||||
1975 | 14.24 | f | 17.95 | i | 26.29 | g | 34.47 | 45.71 | 54.77 | 61.97 | 60.48 | 49.43 | 35.48 | 21.80 | e | 22.42 | 42.95 | c | ||||||||
1976 | 16.38 | b | 25.07 | 25.84 | 40.47 | 45.81 | 55.07 | 62.74 | 58.26 | 51.47 | 33.48 | 21.72 | e | 16.14 | c | 37.70 | ||||||||||
1977 | 7.21 | b | 21.73 | b | 25.59 | b | 41.57 | 50.10 | 58.63 | 64.68 | 61.19 | 53.47 | 36.00 | 23.50 | ----- | z | 40.33 | a | ||||||||
1978 | 11.62 | j | 13.37 | i | 29.39 | h | 39.22 | c | 46.19 | 58.47 | 64.48 | b | 58.32 | 51.57 | g | 35.90 | j | 25.16 | k | 12.74 | l | 53.34 | g | |||
1979 | 5.55 | i | 16.42 | i | 32.40 | k | 38.22 | c | 45.90 | 55.67 | 64.13 | 59.10 | 52.60 | 39.48 | b | 23.40 | j | 18.42 | l | 50.73 | e | |||||
1980 | ----- | z | 22.29 | h | 25.33 | j | 36.09 | h | 45.68 | 58.00 | 65.52 | 63.13 | 52.36 | e | 35.73 | i | 23.22 | l | 24.37 | l | 56.94 | g | ||||
1981 | 20.43 | j | 19.16 | i | 30.00 | m | 42.33 | 48.26 | 60.60 | 63.23 | 60.39 | 53.36 | e | 39.10 | j | 31.63 | k | 17.18 | i | 54.69 | f | |||||
1982 | 14.55 | k | 11.06 | k | 30.30 | h | 35.83 | f | 47.63 | l | 53.05 | h | 61.33 | j | ----- | z | 50.05 | j | 33.75 | k | 18.68 | k | 15.10 | k | ----- | z |
1983 | 17.14 | j | 20.39 | j | 28.67 | j | 32.86 | h | 45.21 | g | 53.57 | g | 63.06 | m | 63.65 | h | 51.26 | k | 36.87 | p | 24.80 | j | 3.81 | j | ----- | z |
1984 | 2.16 | l | 20.55 | i | 24.86 | i | 34.59 | c | 49.10 | b | 56.89 | b | 62.07 | a | 60.14 | b | 48.57 | i | 36.05 | i | 24.15 | j | 18.32 | l | 52.56 | g |
1985 | 12.63 | l | 13.11 | i | 28.95 | j | 41.08 | f | 49.96 | f | 54.43 | g | 60.55 | i | 59.25 | g | 50.50 | h | 34.67 | j | 23.79 | k | 12.95 | j | ----- | z |
1986 | 20.57 | j | 21.00 | i | 30.24 | j | 39.77 | h | 46.25 | k | 59.10 | i | 61.91 | i | 59.00 | k | 50.39 | g | 40.76 | j | 27.06 | n | 20.38 | j | ----- | z |
1987 | 21.00 | l | 27.10 | h | 26.57 | j | 36.33 | i | 50.47 | l | 57.76 | m | 62.70 | k | 61.45 | k | 49.70 | j | 35.71 | j | 25.50 | l | 15.52 | j | ----- | z |
1988 | 5.16 | l | 17.47 | j | 24.09 | h | 32.33 | l | 46.95 | l | 60.11 | l | 60.79 | l | 62.00 | h | 50.24 | i | 38.45 | k | 25.90 | j | 16.38 | j | ----- | z |
1989 | 14.47 | l | 9.74 | i | 28.29 | c | 36.96 | b | 48.70 | d | 54.11 | c | 61.50 | a | 60.71 | c | 49.59 | c | 36.00 | a | 24.00 | 10.10 | b | 41.00 | b | |
1990 | 12.72 | b | 18.11 | a | 27.54 | c | 36.93 | b | 43.17 | b | 57.64 | b | 60.30 | a | 57.52 | 54.47 | 35.29 | 27.10 | 10.10 | 36.74 | ||||||
1991 | 14.14 | b | 20.11 | 27.03 | 37.03 | 46.71 | 58.48 | a | 60.56 | f | 60.96 | h | 50.85 | j | 35.95 | i | 20.80 | o | 20.05 | l | 33.92 | f | ||||
1992 | 17.04 | g | 24.58 | c | 30.24 | b | 37.31 | d | 47.58 | g | 53.78 | g | 59.38 | j | 49.55 | k | 47.50 | l | 34.45 | k | 19.74 | k | 8.18 | i | 30.71 | i |
1993 | 6.95 | l | 14.63 | i | 26.27 | i | 34.95 | j | 46.05 | l | 54.55 | h | 59.48 | f | 57.59 | i | 43.58 | f | 35.76 | j | 15.11 | k | 13.78 | h | ----- | z |
1994 | 12.86 | i | 9.81 | g | 25.52 | h | 33.70 | j | 47.40 | k | 55.57 | i | 56.35 | k | 58.75 | g | 47.05 | i | 38.05 | l | 25.25 | j | 20.05 | j | ----- | z |
1995 | 17.75 | k | 23.67 | j | 27.30 | h | 33.45 | j | 43.95 | j | 54.62 | i | 57.09 | h | 59.74 | h | 45.75 | j | 31.19 | j | 20.95 | j | 15.58 | l | ----- | z |
1996 | 9.20 | k | 13.16 | j | 18.38 | j | 35.00 | j | 46.29 | j | 55.79 | k | 57.09 | i | 55.05 | i | 45.85 | j | 34.10 | j | 23.95 | k | 15.25 | c | 15.25 | k |
1997 | 14.48 | b | 21.32 | 28.31 | b | 31.57 | 46.11 | c | 58.37 | 62.48 | 61.94 | 55.07 | a | 38.85 | d | 26.68 | b | 21.67 | d | 38.90 | ||||||
1998 | 21.48 | 26.33 | a | 26.03 | b | 35.45 | a | 48.90 | 54.38 | d | 63.90 | b | 59.73 | a | 55.39 | b | 38.55 | b | 28.75 | b | 14.73 | a | 39.47 | |||
1999 | 18.88 | e | 24.32 | 27.03 | a | 37.28 | a | 46.00 | c | 55.20 | 62.45 | 61.35 | 49.10 | 34.27 | a | 27.57 | 19.26 | 38.56 | ||||||||
2000 | 17.03 | 20.41 | 29.73 | a | 34.46 | b | 48.00 | b | 56.08 | d | 62.53 | a | 63.00 | 50.50 | b | 41.04 | g | 18.88 | d | 13.00 | a | 37.60 | a | |||
2001 | 13.23 | a | 18.25 | 28.07 | d | 36.86 | a | 46.52 | b | 56.68 | b | 66.24 | b | 60.48 | b | 48.50 | f | 34.76 | b | 26.90 | 17.61 | 36.87 | a | |||
2002 | 14.78 | d | 17.15 | a | 19.18 | c | 37.64 | b | 45.85 | e | 63.15 | c | 65.82 | c | 61.94 | 52.26 | c | 36.42 | 27.92 | d | 19.73 | a | 38.49 | |||
2003 | 21.07 | a | 17.75 | 30.77 | 40.10 | a | 47.67 | d | 56.52 | c | 65.03 | 63.75 | c | 50.04 | c | 40.12 | e | 27.30 | g | 17.17 | b | 40.91 | a | |||
2004 | 16.30 | a | 19.62 | c | 34.43 | a | 38.38 | a | 50.52 | b | 55.76 | a | 60.23 | 57.40 | a | 54.07 | 40.29 | c | 28.00 | b | 19.48 | d | 39.54 | |||
2005 | 19.64 | c | 23.00 | c | 28.93 | a | 37.46 | b | 46.17 | b | 57.60 | e | 63.37 | a | 61.30 | a | 55.62 | a | 39.71 | 27.27 | 16.33 | a | 39.70 | |||
2006 | 20.11 | c | 16.39 | e | 26.78 | d | 37.43 | b | 48.76 | b | 60.93 | a | 65.45 | 62.29 | 46.96 | c | 36.22 | d | 26.76 | a | 17.57 | a | 38.80 | |||
2007 | 1.03 | a | 12.21 | 32.65 | 36.00 | a | 47.53 | a | 55.32 | e | 62.50 | e | 64.65 | 52.90 | a | 36.93 | b | 23.73 | 13.58 | 36.59 | ||||||
2008 | 11.97 | 17.48 | 26.00 | a | 34.34 | a | 44.77 | a | 56.70 | 65.10 | 61.80 | a | 51.47 | 38.10 | 29.18 | b | 15.29 | 37.68 | ||||||||
2009 | 16.58 | 22.46 | 26.32 | 36.80 | 47.71 | 57.40 | 62.19 | 59.16 | 49.97 | 32.13 | 27.82 | b | 11.68 | 37.52 | ||||||||||||
2010 | 15.84 | 18.75 | 28.03 | 38.43 | 45.77 | a | 61.47 | 64.58 | 62.29 | 53.97 | 39.58 | 22.53 | 19.32 | 39.21 | ||||||||||||
2011 | 11.57 | a | 12.21 | 27.35 | 36.97 | 44.84 | 58.63 | 65.58 | 65.52 | 49.63 | 36.87 | 26.03 | 9.27 | a | 37.04 | |||||||||||
2012 | 17.63 | a | 20.69 | 33.61 | 41.57 | 47.52 | 61.33 | 66.55 | 60.73 | a | 50.47 | 36.03 | 27.15 | c | 16.42 | 39.98 | ||||||||||
2013 | 12.06 | 17.82 | 25.48 | 30.07 | 46.90 | 60.37 | 62.74 | 63.14 | c | 57.53 | 36.87 | 24.50 | 13.35 | 37.57 | ||||||||||||
2014 | 13.74 | 16.86 | 26.16 | 38.20 | 47.03 | 58.90 | 61.94 | 61.39 | 53.96 | g | 41.11 | c | 21.87 | 19.73 | a | 36.99 | a | |||||||||
2015 | 17.39 | 21.18 | 29.84 | 40.23 | 46.67 | a | 59.71 | b | 63.61 | 61.35 | 57.57 | 43.93 | a | 27.60 | 21.19 | 40.86 | ||||||||||
2016 | 17.67 | a | 24.38 | 29.71 | 37.70 | 45.65 | 59.19 | d | 63.04 | f | 61.36 | c | 53.60 | 40.71 | 30.53 | 13.21 | c | 37.61 | a | |||||||
2017 | 18.16 | 23.89 | 31.10 | 39.63 | 46.70 | a | 58.43 | 64.19 | 59.90 | b | 53.63 | 39.87 | 31.37 | 17.29 | 40.35 | |||||||||||
2018 | 15.23 | 18.04 | 27.40 | a | 34.33 | 53.29 | 61.17 | 65.60 | a | 60.29 | 55.33 | c | 39.06 | 24.00 | g | 19.61 | 40.85 | a | ||||||||
2019 | 18.97 | 15.18 | 26.13 | 38.13 | 44.35 | 55.27 | 64.29 | 63.06 | 57.80 | 29.35 | 23.27 | 20.45 | 38.02 | |||||||||||||
2020 | 18.87 | 18.90 | 30.97 | 35.07 | 48.94 | 60.97 | 64.87 | 61.26 | 46.67 | 34.39 | 29.17 | 18.55 | 39.05 | |||||||||||||
2021 | 17.39 | 11.54 | 28.23 | 35.50 | 48.32 | 58.30 | 63.52 | 62.39 | 55.03 | 38.52 | 28.13 | 17.81 | 38.72 | |||||||||||||
2022 | 13.26 | 14.86 | 25.19 | 36.97 | 47.61 | 59.10 | 65.90 | 61.97 | 51.93 | 37.81 | 21.80 | 10.97 | 37.28 | |||||||||||||
2023 | 14.52 | 15.46 | 23.52 | 35.17 | 50.48 | 56.40 | 62.26 | 61.29 | 52.43 | 37.29 | 26.27 | 22.19 | 38.11 | |||||||||||||
2024 | 12.97 | 25.31 | 27.32 | 36.72 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.58 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 14.95 | 19.87 | 27.21 | 37.48 | 47.41 | 57.77 | 63.31 | 61.09 | 51.82 | 38.14 | 25.67 | 17.26 | 38.56 | |||||||||||||
S.D. | 4.39 | 3.85 | 3.33 | 2.79 | 2.15 | 2.41 | 1.82 | 1.84 | 2.93 | 3.04 | 2.96 | 3.62 | 1.21 | |||||||||||||
SKEW | -0.79 | -0.24 | -0.43 | -0.08 | 0.56 | 0.25 | 0.09 | -0.03 | 0.04 | -0.11 | -0.25 | -0.48 | 0.19 | |||||||||||||
MAX | 23.53 | 28.57 | 34.43 | 43.39 | 53.65 | 64.27 | 67.00 | 65.52 | 57.80 | 45.29 | 32.79 | 23.94 | 40.91 | |||||||||||||
MIN | 1.03 | 11.54 | 19.00 | 30.07 | 43.17 | 51.93 | 60.23 | 57.23 | 45.62 | 29.35 | 17.43 | 9.27 | 36.59 | |||||||||||||
YRS | 59 | 60 | 63 | 72 | 71 | 70 | 68 | 70 | 67 | 66 | 61 | 60 | 47 |