YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | 27.61 | 30.14 | 36.87 | a | 44.47 | 54.07 | a | 62.77 | 69.06 | 66.13 | 57.40 | 47.39 | 32.53 | 29.84 | 46.52 | |||||||||||
1941 | 30.45 | 35.18 | 35.61 | 38.17 | 51.45 | 55.83 | 62.45 | b | 62.45 | 52.85 | d | 43.73 | a | 34.43 | 28.32 | 44.24 | ||||||||||
1942 | 24.45 | 24.93 | a | 31.10 | b | 41.28 | a | 47.29 | n | 59.23 | 67.52 | b | 61.84 | 54.84 | e | 47.42 | 35.81 | c | 29.03 | b | 43.40 | a | ||||
1943 | 26.50 | s | 31.75 | d | 37.14 | b | 45.79 | a | 52.57 | a | 58.00 | a | 66.33 | a | 63.83 | b | 58.43 | 46.83 | h | 31.68 | e | ----- | z | 49.50 | c | |
1944 | ----- | z | ----- | z | ----- | z | 40.12 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.12 | k |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | 52.41 | i | 54.92 | e | 64.79 | g | 63.96 | d | ----- | z | ----- | z | ----- | z | ----- | z | 59.44 | j |
1946 | 24.00 | k | 26.12 | b | 33.80 | a | 46.70 | c | 50.20 | a | 61.52 | a | 65.77 | a | 63.81 | 57.79 | a | 42.39 | 29.69 | a | 28.81 | 46.05 | a | |||
1947 | 23.10 | 31.86 | 36.90 | 42.23 | 54.36 | c | 59.10 | a | 66.85 | d | 59.20 | a | 59.50 | 44.74 | h | 30.93 | 24.57 | a | 44.42 | a | ||||||
1948 | 23.63 | a | 27.17 | 28.97 | a | 41.45 | a | 50.13 | a | 57.21 | a | 65.31 | e | 63.60 | a | 58.37 | 45.43 | a | 28.50 | 26.82 | i | 44.52 | a | |||
1949 | 16.29 | 19.79 | 32.65 | 42.38 | a | 48.97 | a | 58.00 | 64.87 | 61.32 | c | 59.79 | b | 43.14 | c | 35.54 | b | 21.36 | c | 42.01 | ||||||
1950 | 23.81 | d | 33.00 | a | 35.52 | b | 45.07 | b | 49.07 | a | 58.03 | a | 64.16 | 60.74 | 51.60 | 50.86 | i | 35.89 | c | 30.77 | 44.33 | a | ||||
1951 | 25.77 | 28.93 | 33.32 | 41.77 | 50.35 | 57.87 | 67.00 | 63.10 | 55.83 | 43.07 | a | 30.48 | a | 23.37 | d | 43.41 | ||||||||||
1952 | 25.10 | 26.83 | 29.87 | a | 40.13 | 50.55 | 57.33 | 63.81 | 63.71 | 56.32 | b | 46.29 | 26.79 | a | 23.89 | d | 42.55 | |||||||||
1953 | 31.80 | f | 27.57 | 34.13 | 41.43 | 43.90 | 57.10 | a | 64.68 | c | 58.55 | b | 55.90 | 43.45 | 31.89 | c | 21.68 | 43.66 | a | |||||||
1954 | 24.81 | 31.54 | b | 30.26 | 43.48 | a | 50.65 | 53.62 | a | 62.72 | b | 59.52 | 54.53 | 42.32 | 32.34 | a | 22.22 | d | 42.33 | |||||||
1955 | 18.03 | 20.11 | 26.72 | b | 32.90 | a | 40.93 | a | 56.00 | 62.80 | a | 64.03 | 57.13 | 47.11 | c | 33.27 | 29.59 | b | 40.72 | |||||||
1956 | 30.45 | 20.67 | b | 31.55 | 38.21 | b | 48.81 | 62.37 | 63.40 | a | 60.74 | 60.17 | a | 43.83 | a | 25.52 | a | 22.77 | 42.37 | |||||||
1957 | 27.61 | 36.64 | 35.39 | 40.27 | 46.17 | a | 61.47 | 64.53 | a | 62.55 | 56.93 | 44.32 | 30.52 | a | 27.03 | a | 44.45 | |||||||||
1958 | 24.90 | 33.43 | 31.16 | 40.73 | 53.03 | 61.17 | a | 66.32 | 66.26 | 56.57 | 46.65 | 31.17 | 27.58 | 44.91 | ||||||||||||
1959 | 24.23 | 27.57 | 32.58 | 43.61 | b | 49.13 | 61.90 | 67.48 | 63.23 | a | 57.20 | 44.97 | b | 32.17 | 26.48 | b | 44.21 | |||||||||
1960 | 19.23 | 26.07 | 37.87 | 42.40 | 48.81 | 63.33 | 66.23 | 64.45 | 58.03 | 43.00 | 32.17 | 17.23 | 43.23 | |||||||||||||
1961 | 20.06 | 29.82 | 31.45 | 40.43 | 49.94 | 65.20 | 67.77 | 64.55 | 53.27 | 43.39 | 32.93 | 17.19 | 43.00 | |||||||||||||
1962 | 17.48 | 25.93 | 30.06 | 46.57 | 47.61 | 59.03 | a | 67.00 | b | 64.10 | 59.03 | a | 46.16 | 37.45 | a | 27.50 | c | 43.99 | ||||||||
1963 | 19.77 | 33.93 | a | 34.10 | 40.04 | b | 53.93 | b | 58.00 | d | 70.03 | 63.48 | b | 58.96 | b | 50.67 | d | 36.40 | 22.39 | 45.14 | ||||||
1964 | 21.97 | 23.48 | 30.45 | 40.40 | 49.37 | a | 58.21 | a | 68.77 | a | 63.80 | a | 55.96 | b | 49.42 | 29.54 | d | 26.97 | b | 43.19 | ||||||
1965 | 29.77 | a | 28.48 | c | 31.79 | b | 40.34 | a | 46.58 | 53.21 | f | 64.97 | 64.27 | e | 53.61 | b | 46.21 | c | 39.64 | b | 27.40 | a | 43.01 | a | ||
1966 | 19.64 | f | 24.59 | a | 35.93 | a | 45.48 | a | 53.00 | 58.37 | c | 66.44 | d | 66.58 | 58.08 | d | 44.17 | b | 34.67 | 26.10 | 46.67 | a | ||||
1967 | 19.35 | 24.96 | a | 34.31 | b | ----- | z | 44.23 | 46.38 | a | 55.31 | e | 43.74 | d | 47.87 | 46.94 | 35.93 | 15.77 | a | 37.71 | a | |||||
1968 | 10.00 | 33.03 | 34.87 | 36.70 | 45.45 | 52.93 | 55.10 | b | 49.00 | c | 53.67 | 46.58 | g | 34.66 | a | 18.69 | b | 38.56 | a | |||||||
1969 | 28.13 | 23.25 | 30.10 | 39.53 | 49.74 | 59.10 | 64.97 | b | 65.70 | a | 54.87 | 40.55 | 34.03 | 28.58 | 43.21 | |||||||||||
1970 | 25.84 | 32.07 | 31.87 | 33.00 | 52.23 | 59.47 | 66.61 | 65.23 | 54.37 | 40.65 | 33.55 | a | 24.50 | a | 43.28 | |||||||||||
1971 | 23.03 | 28.64 | 34.23 | 39.60 | 43.26 | 59.00 | 68.45 | 64.19 | 54.20 | 41.61 | 31.03 | 24.00 | 42.60 | |||||||||||||
1972 | 25.68 | 30.03 | 40.94 | 42.43 | 49.87 | 58.57 | 67.26 | 63.71 | 54.81 | c | 46.16 | 31.33 | 22.45 | b | 44.44 | |||||||||||
1973 | 23.27 | a | 30.68 | 31.77 | 38.03 | a | 50.97 | 58.59 | a | 65.23 | a | 61.86 | c | 53.55 | a | 43.74 | 34.47 | 25.74 | 43.16 | |||||||
1974 | 24.45 | b | 24.79 | 39.13 | 38.97 | 51.90 | 65.40 | 64.13 | a | 63.06 | 57.10 | a | 46.41 | b | 32.79 | b | 22.76 | b | 44.24 | |||||||
1975 | 21.74 | 26.79 | 31.97 | 35.73 | 45.84 | 58.60 | 65.23 | 63.35 | 56.50 | 42.65 | 30.93 | 25.19 | 42.04 | |||||||||||||
1976 | 24.77 | 31.97 | 32.23 | 39.87 | 51.97 | 58.70 | 65.90 | 61.19 | 55.10 | 43.74 | 32.37 | 22.06 | 43.32 | |||||||||||||
1977 | 21.19 | 29.86 | 30.23 | 41.93 | 45.55 | 60.13 | 65.90 | 64.87 | 59.03 | 46.48 | 35.33 | 32.63 | a | 44.43 | ||||||||||||
1978 | 29.77 | 31.96 | a | 39.48 | 42.33 | 48.29 | 61.33 | 65.90 | 62.13 | 55.27 | 49.94 | 35.83 | 20.71 | 45.25 | ||||||||||||
1979 | 22.42 | 28.07 | 37.39 | 42.67 | 50.00 | a | 59.08 | d | 66.17 | a | 62.11 | d | 59.57 | 48.70 | a | 31.40 | 26.03 | b | 44.47 | |||||||
1980 | 30.73 | a | 31.17 | 33.13 | 40.43 | 45.26 | 58.86 | b | 66.34 | b | 63.65 | 56.60 | 43.52 | 33.33 | 30.70 | a | 44.48 | |||||||||
1981 | 29.66 | b | 29.37 | a | 33.30 | a | 44.80 | 51.26 | 63.97 | a | 66.90 | 63.53 | a | 55.97 | 44.06 | 35.90 | 28.94 | 45.64 | ||||||||
1982 | 23.67 | a | 28.82 | 35.71 | 41.07 | 49.55 | 57.43 | 63.52 | 63.20 | a | 55.77 | 41.34 | b | 33.31 | a | 25.81 | 43.27 | |||||||||
1983 | 25.06 | 31.14 | 36.77 | 35.07 | b | 48.42 | 56.27 | 63.00 | 62.10 | 59.93 | 46.45 | 35.37 | 32.13 | 44.31 | ||||||||||||
1984 | 24.55 | 26.62 | 35.06 | 39.82 | b | 56.16 | 59.27 | 64.84 | 62.70 | a | 57.47 | 40.06 | 32.90 | 25.68 | 43.76 | |||||||||||
1985 | 26.29 | 26.57 | 35.61 | 45.27 | 51.16 | 61.20 | 66.43 | a | 64.42 | 52.60 | 45.65 | 33.07 | 26.07 | a | 44.53 | |||||||||||
1986 | 28.77 | 33.96 | 39.48 | 42.62 | a | 50.52 | 60.47 | 63.81 | 66.29 | 53.97 | 42.16 | 34.93 | 27.19 | 45.35 | ||||||||||||
1987 | 22.84 | 30.00 | 32.06 | 43.93 | 50.00 | 61.33 | 61.84 | 62.10 | 56.30 | 49.10 | 33.03 | a | 22.83 | a | 43.78 | |||||||||||
1988 | 24.68 | 30.14 | a | 34.00 | 42.77 | 49.65 | 60.87 | 67.74 | 63.19 | 54.20 | 49.90 | 35.33 | 25.33 | a | 44.82 | |||||||||||
1989 | 23.80 | a | 28.11 | a | 40.17 | a | 49.47 | 53.45 | 59.70 | 68.33 | a | 63.84 | 56.23 | 44.55 | 37.20 | 25.75 | c | 45.88 | ||||||||
1990 | 24.87 | a | 28.75 | 38.40 | a | 45.80 | 50.68 | 62.70 | 66.55 | 62.23 | a | 58.59 | c | 43.22 | d | 32.44 | c | 17.32 | c | 44.30 | ||||||
1991 | 23.45 | 30.64 | 32.00 | 41.20 | 47.46 | g | 55.86 | b | 65.93 | d | 64.79 | b | 57.69 | a | 48.03 | a | 31.77 | 23.77 | a | 43.19 | a | |||||
1992 | 20.42 | 31.67 | b | 36.23 | 46.60 | 52.29 | 57.83 | a | 65.19 | 62.42 | 56.03 | a | 47.56 | d | 28.43 | b | 16.07 | b | 43.39 | |||||||
1993 | 28.00 | 32.04 | a | 37.97 | 43.10 | a | 51.39 | 58.68 | b | 65.16 | 63.68 | 55.60 | 44.76 | b | 28.32 | b | 22.37 | a | 44.25 | |||||||
1994 | 23.68 | 26.75 | 37.58 | 42.52 | a | 51.13 | a | 64.63 | 66.39 | 67.38 | b | 58.61 | b | 43.81 | 30.27 | 27.30 | a | 45.00 | ||||||||
1995 | 28.47 | a | 35.19 | a | 36.29 | 40.62 | a | 49.45 | 56.97 | 65.97 | 67.40 | a | 58.43 | 45.00 | 37.13 | 27.87 | 45.73 | |||||||||
1996 | 25.29 | 34.36 | a | 35.55 | 43.63 | 55.39 | 64.86 | a | 70.58 | 67.32 | 54.83 | a | 44.07 | b | 34.67 | 27.10 | b | 46.47 | ||||||||
1997 | 27.26 | 28.57 | 38.52 | b | 41.20 | 55.74 | 58.60 | 64.84 | 64.26 | 60.00 | 43.94 | 35.33 | 23.68 | 45.16 | ||||||||||||
1998 | 27.84 | 29.43 | 34.35 | 37.32 | b | 48.77 | a | 57.17 | 66.81 | 66.45 | b | 57.47 | 44.16 | 33.87 | 25.07 | b | 44.06 | |||||||||
1999 | 27.57 | a | 29.82 | 37.81 | 38.69 | a | 49.90 | 59.83 | 65.52 | 62.70 | a | 55.69 | a | 45.20 | a | 34.57 | 23.68 | 44.25 | ||||||||
2000 | 27.74 | 32.24 | 35.28 | b | 47.07 | b | 55.10 | a | 64.83 | 67.68 | 65.39 | 58.57 | 45.00 | 27.70 | 26.83 | b | 46.12 | |||||||||
2001 | 25.57 | c | 29.71 | 36.97 | b | 42.93 | 54.57 | a | 63.23 | 65.07 | a | 63.90 | b | 59.90 | 48.40 | a | 37.23 | 24.67 | d | 46.01 | ||||||
2002 | 25.32 | 26.67 | a | 30.42 | 45.61 | b | 52.83 | b | 64.40 | 69.65 | 66.41 | d | 57.39 | b | 44.27 | a | 33.44 | e | 23.77 | a | 45.01 | |||||
2003 | 30.27 | a | 30.42 | b | 35.97 | 39.72 | a | 54.68 | 62.34 | a | 71.20 | a | 66.38 | b | 58.80 | 50.31 | b | 32.29 | b | 25.38 | b | 46.48 | ||||
2004 | 25.77 | a | 28.11 | b | 41.30 | a | 43.80 | 53.52 | 62.13 | 66.55 | 63.68 | 55.70 | 44.63 | a | 33.97 | 26.00 | b | 45.43 | ||||||||
2005 | 33.04 | g | 36.06 | j | 35.96 | e | 41.70 | 47.75 | w | 62.33 | r | 67.66 | b | 63.12 | e | 55.70 | c | 46.35 | 34.71 | b | 24.21 | b | 46.18 | d | ||
2006 | 24.87 | 27.56 | a | 32.16 | 42.48 | a | 55.42 | 65.90 | 67.74 | 63.35 | 53.63 | 43.26 | 33.60 | 25.31 | b | 44.61 | ||||||||||
2007 | 21.63 | d | 30.93 | 38.73 | a | 45.80 | 53.20 | a | 63.83 | a | 70.03 | 66.26 | 59.90 | a | 44.52 | 37.43 | 23.10 | a | 46.28 | |||||||
2008 | 21.87 | a | 30.24 | 35.29 | 40.40 | 47.81 | 62.30 | 68.06 | 66.61 | 57.27 | 44.58 | 36.70 | 26.47 | a | 44.80 | |||||||||||
2009 | 28.35 | 29.00 | 35.97 | 41.27 | 56.58 | 59.23 | 68.23 | 65.84 | 56.87 | 43.34 | b | 33.93 | 22.33 | a | 45.08 | |||||||||||
2010 | 23.83 | a | 29.89 | 33.03 | 40.23 | 48.32 | 59.23 | 66.81 | 63.93 | a | 58.67 | 47.57 | a | 31.33 | 32.07 | a | 44.58 | |||||||||
2011 | 20.55 | 23.75 | 35.68 | 42.55 | a | 46.87 | a | 59.37 | 66.24 | b | 66.74 | 58.57 | 44.35 | 33.23 | 24.97 | a | 43.57 | |||||||||
2012 | 26.97 | 28.34 | 34.87 | 45.77 | 53.94 | 64.40 | 66.87 | 67.26 | 58.73 | 46.94 | 34.63 | 26.30 | a | 46.25 | ||||||||||||
2013 | 21.03 | 26.62 | b | 37.94 | 44.86 | a | 50.77 | 65.97 | 66.45 | 62.65 | 56.83 | a | 41.18 | t | 34.23 | 22.93 | a | 44.57 | a | |||||||
2014 | 27.06 | 33.46 | 37.90 | 42.57 | 48.41 | d | 62.33 | f | 67.45 | 63.39 | 59.67 | 48.06 | 34.00 | 29.57 | a | 44.69 | a | |||||||||
2015 | 27.43 | a | 34.32 | 40.35 | 41.90 | 48.81 | 62.86 | a | 63.42 | 65.23 | 59.23 | 50.00 | 31.97 | 25.13 | a | 45.89 | ||||||||||
2016 | 26.40 | a | 31.38 | 39.26 | 43.33 | 49.74 | 66.27 | 67.71 | 61.97 | 57.23 | 49.10 | b | 36.97 | 27.79 | b | 46.43 | ||||||||||
2017 | 29.68 | 35.39 | 39.77 | 43.52 | c | 49.69 | b | 65.50 | 67.63 | a | 64.50 | a | 56.64 | b | 44.29 | 39.10 | a | 27.15 | e | 46.91 | ||||||
2018 | 28.07 | d | 29.79 | 35.80 | a | 46.83 | 53.11 | c | 64.63 | c | 68.72 | b | 65.93 | c | 59.00 | 45.39 | 32.47 | 28.33 | m | 48.16 | a | |||||
2019 | 29.17 | y | 26.43 | 38.11 | c | 46.10 | a | 45.52 | b | 58.37 | c | 67.10 | a | 68.42 | 59.67 | 41.80 | a | 33.31 | a | 26.97 | a | 46.53 | a | |||
2020 | 27.52 | d | 28.29 | a | 36.10 | 45.33 | 55.06 | 62.41 | a | 67.52 | 68.61 | 58.33 | 46.61 | 34.80 | 21.10 | a | 45.97 | |||||||||
2021 | 23.87 | a | 30.25 | 32.80 | a | 44.17 | a | 52.79 | b | 66.31 | a | 70.93 | d | 65.48 | b | 60.20 | 42.68 | 37.23 | 26.80 | a | 46.13 | |||||
2022 | 24.03 | 24.46 | 33.58 | 43.47 | 53.74 | 63.17 | 68.42 | 65.26 | 61.13 | 45.26 | 29.21 | a | 25.93 | b | 44.80 | |||||||||||
2023 | 25.29 | c | 25.21 | 32.48 | 41.63 | 50.97 | 55.73 | 69.90 | 65.45 | 56.52 | a | 46.13 | 34.57 | 27.77 | 44.31 | |||||||||||
2024 | 28.30 | a | 31.62 | 36.29 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.96 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 24.76 | 29.13 | 34.87 | 42.02 | 50.44 | 60.15 | 66.16 | 63.61 | 56.83 | 45.21 | 33.35 | 25.17 | 44.46 | |||||||||||||
S.D. | 3.67 | 3.49 | 3.14 | 3.11 | 3.23 | 3.51 | 2.64 | 3.40 | 2.35 | 2.46 | 2.73 | 3.53 | 1.31 | |||||||||||||
SKEW | -0.99 | -0.37 | -0.09 | -0.49 | -0.40 | -0.56 | -1.56 | -3.31 | -0.79 | 0.29 | -0.36 | -0.51 | -0.31 | |||||||||||||
MAX | 30.73 | 36.64 | 41.30 | 49.47 | 56.58 | 66.31 | 71.20 | 68.61 | 61.13 | 50.67 | 39.64 | 32.63 | 46.91 | |||||||||||||
MIN | 10.00 | 19.79 | 26.72 | 32.90 | 40.93 | 46.38 | 55.10 | 43.74 | 47.87 | 40.06 | 25.52 | 15.77 | 40.72 | |||||||||||||
YRS | 77 | 82 | 82 | 82 | 79 | 80 | 82 | 83 | 82 | 77 | 82 | 79 | 65 |