YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | 22.59 | i | 16.61 | 36.76 | j | 37.07 | 46.72 | m | 64.33 | r | 64.20 | p | 65.06 | 65.59 | a | 50.83 | a | 34.73 | 25.55 | 42.21 | e | |||||
1940 | 21.39 | 24.72 | 31.32 | 35.87 | 47.68 | 56.33 | 61.13 | 59.61 | 53.13 | 38.61 | 25.00 | 25.29 | 40.01 | |||||||||||||
1941 | 26.94 | 31.75 | 34.06 | 38.43 | 51.42 | 56.30 | 62.52 | 61.03 | 57.38 | a | 44.39 | 30.00 | 26.10 | 43.36 | ||||||||||||
1942 | 23.84 | 25.04 | 27.13 | 38.40 | 43.71 | 52.17 | 60.13 | 60.13 | 50.48 | a | 40.23 | 27.52 | e | ----- | z | 40.80 | a | |||||||||
1943 | 26.24 | j | 27.74 | a | 31.32 | 40.93 | 49.97 | 60.27 | 63.16 | 64.71 | 53.20 | 35.06 | 20.33 | 22.03 | 42.61 | a | ||||||||||
1944 | 17.48 | 25.76 | 24.52 | 34.40 | 44.93 | a | 56.57 | 62.30 | a | 61.52 | 52.73 | 39.00 | 26.59 | a | 16.87 | 38.56 | ||||||||||
1945 | 21.42 | 24.25 | 28.81 | 35.60 | 47.84 | 54.10 | 62.87 | 64.10 | 53.83 | 42.06 | 24.03 | 18.03 | 39.75 | |||||||||||||
1946 | 22.00 | 19.39 | 30.06 | 44.10 | 48.29 | 59.47 | 61.48 | 61.84 | 57.10 | 43.40 | a | 23.20 | 20.58 | 40.91 | ||||||||||||
1947 | 19.42 | 20.64 | 28.58 | 36.66 | a | 51.16 | 55.43 | 63.58 | 62.00 | 52.00 | ----- | z | ----- | z | 18.38 | e | 40.79 | b | ||||||||
1948 | 15.50 | g | 27.07 | 30.45 | 40.57 | 50.87 | 61.33 | 65.90 | 63.55 | 54.13 | 41.65 | 20.53 | 25.87 | 43.81 | a | |||||||||||
1949 | 25.07 | a | 24.75 | 32.32 | 37.70 | 47.74 | 59.83 | 65.52 | 61.29 | 57.50 | 41.71 | 26.90 | 21.35 | 41.81 | ||||||||||||
1950 | 24.52 | b | 25.54 | b | 31.16 | 39.00 | 45.84 | 60.30 | 62.94 | 58.68 | 54.23 | 45.06 | 25.93 | 19.13 | 41.03 | |||||||||||
1951 | 21.65 | 23.71 | 39.42 | s | 52.41 | a | 56.77 | 55.40 | o | 69.65 | 65.32 | 54.34 | a | 45.65 | 25.04 | b | 26.87 | 44.14 | b | |||||||
1952 | 28.58 | 23.83 | 26.90 | 39.03 | a | 49.07 | b | 65.12 | d | 64.25 | c | 65.18 | c | 54.00 | q | 34.86 | b | 27.35 | d | 20.00 | 40.38 | a | ||||
1953 | 22.90 | b | 20.89 | a | 33.03 | b | 38.65 | d | 43.07 | a | 60.52 | a | 66.90 | a | 64.35 | 52.55 | a | 39.55 | 28.04 | c | 14.97 | a | 40.45 | |||
1954 | 21.55 | 25.18 | 33.03 | 43.57 | 51.63 | a | 57.58 | f | 66.63 | a | 64.71 | 59.83 | 45.10 | a | 27.90 | 20.03 | 41.74 | a | ||||||||
1955 | 21.13 | 19.67 | a | 34.26 | 40.00 | a | 48.84 | 57.86 | a | 63.32 | 62.73 | a | 53.54 | q | 40.61 | 29.07 | 21.32 | 39.89 | a | |||||||
1956 | 22.61 | 19.83 | 28.55 | 33.30 | 45.32 | 55.87 | 57.65 | 57.29 | 49.66 | a | 40.58 | 19.67 | 15.90 | 37.18 | ||||||||||||
1957 | 28.90 | 34.04 | 31.55 | 37.77 | 45.03 | 54.03 | a | 62.83 | a | 61.80 | a | 49.30 | 42.52 | 29.53 | 21.84 | 41.60 | ||||||||||
1958 | 22.26 | 28.64 | 33.16 | 38.97 | 49.23 | 59.93 | b | 62.29 | 62.05 | l | 56.50 | h | 45.87 | 30.07 | 19.71 | 39.01 | b | |||||||||
1959 | 18.97 | 26.11 | 27.42 | 41.31 | a | 48.06 | 59.70 | 64.03 | 63.84 | 53.83 | 41.48 | 23.73 | 22.71 | 40.93 | ||||||||||||
1960 | 19.13 | 21.82 | a | 31.26 | 39.40 | 46.65 | 58.83 | 61.90 | 63.55 | 54.23 | 39.52 | 27.73 | 17.42 | 40.12 | ||||||||||||
1961 | 22.13 | 26.32 | 33.32 | 39.33 | 49.52 | 57.13 | 64.70 | a | 61.71 | 53.59 | a | 37.34 | b | 28.77 | 26.03 | a | 41.66 | |||||||||
1962 | 19.94 | 30.50 | 27.00 | 42.30 | 46.42 | 55.20 | 62.10 | 59.16 | 56.50 | 41.97 | 29.10 | a | 25.32 | 41.29 | ||||||||||||
1963 | 16.74 | 24.68 | 31.19 | 43.47 | 50.67 | a | 59.14 | b | 65.48 | 62.11 | d | 56.37 | 42.71 | 27.45 | a | 15.38 | b | 41.28 | ||||||||
1964 | 12.68 | 14.54 | c | 28.52 | j | 37.36 | e | 49.93 | c | 59.12 | d | 66.37 | a | 62.55 | b | 57.03 | 39.21 | c | 28.23 | 22.73 | a | 40.89 | a | |||
1965 | 23.19 | 23.32 | 29.71 | 40.97 | 48.32 | 55.77 | 64.87 | 61.39 | 55.60 | 38.04 | c | 33.03 | 27.81 | 41.83 | ||||||||||||
1966 | 18.90 | 21.29 | 31.13 | 40.93 | 52.03 | 59.33 | 66.55 | 61.29 | 54.70 | 38.71 | 31.87 | 19.94 | 41.39 | |||||||||||||
1967 | 15.87 | 25.14 | 35.39 | 43.97 | 44.35 | 57.86 | b | 64.55 | 60.03 | 52.90 | 39.67 | a | 31.13 | 26.68 | 41.46 | |||||||||||
1968 | 25.29 | 30.20 | d | 35.94 | 39.55 | a | 49.43 | a | 58.20 | 63.55 | 61.00 | 51.03 | 39.97 | 29.30 | 18.68 | 41.84 | ||||||||||
1969 | 27.10 | 24.21 | 24.97 | 40.03 | 46.58 | 57.73 | 65.71 | 62.03 | 53.73 | 45.23 | 28.20 | 25.55 | 41.76 | |||||||||||||
1970 | 20.32 | 28.39 | 31.71 | 34.48 | a | 46.13 | a | 56.57 | 63.23 | 61.52 | 54.50 | b | 36.60 | a | 26.00 | c | 23.81 | 40.27 | ||||||||
1971 | 20.16 | 21.32 | 27.77 | a | 36.52 | a | 46.77 | 57.17 | a | 64.42 | 59.07 | a | 53.50 | 42.55 | 30.77 | 25.94 | 40.50 | |||||||||
1972 | 23.10 | 23.56 | b | 33.19 | 36.23 | 46.16 | 57.43 | 64.87 | a | 59.84 | 54.52 | a | 47.42 | 26.57 | 26.47 | a | 41.61 | |||||||||
1973 | 25.03 | 31.22 | a | 33.48 | b | 36.30 | 46.26 | 54.79 | a | 63.71 | 58.90 | 53.47 | 36.23 | 29.50 | 17.32 | 40.52 | ||||||||||
1974 | 24.52 | 16.50 | 32.94 | 37.00 | 51.60 | a | 59.77 | 62.35 | 58.71 | 53.97 | 45.97 | a | 29.47 | 19.97 | b | 41.06 | ||||||||||
1975 | 23.83 | a | 27.32 | 30.41 | b | 34.13 | 42.90 | 55.11 | b | 60.58 | 59.03 | a | 51.27 | 37.25 | c | 22.45 | a | 18.55 | 38.57 | |||||||
1976 | 16.74 | 27.38 | 30.03 | 39.93 | 47.58 | 58.80 | 62.47 | a | 60.65 | 53.93 | a | 37.57 | a | 23.59 | a | 18.45 | 39.76 | |||||||||
1977 | 22.87 | 24.21 | 26.90 | 40.27 | 48.13 | 59.67 | 63.45 | 64.26 | 57.23 | 42.77 | 29.50 | 25.23 | 42.04 | |||||||||||||
1978 | 25.26 | 28.36 | 34.23 | 40.73 | 48.58 | 59.60 | 65.19 | 60.26 | 55.76 | a | 42.61 | 38.37 | 24.00 | 43.58 | ||||||||||||
1979 | 24.19 | 26.93 | 29.42 | 37.37 | 48.87 | 55.83 | 62.77 | 57.48 | 49.03 | 34.68 | 20.03 | 19.97 | a | 38.88 | ||||||||||||
1980 | 28.42 | 28.32 | a | 29.45 | 35.53 | 47.70 | a | 60.10 | 64.55 | 60.16 | 54.33 | 36.84 | 25.60 | 21.45 | 41.04 | |||||||||||
1981 | 26.87 | 24.54 | 31.00 | 43.14 | a | 49.39 | 60.00 | b | 64.33 | a | 60.10 | 52.57 | 42.65 | 26.69 | a | 24.06 | 42.11 | |||||||||
1982 | 24.42 | 27.04 | 32.48 | 43.83 | a | 46.23 | 57.80 | 62.19 | 60.16 | 53.43 | 37.68 | 30.87 | 24.52 | 41.72 | ||||||||||||
1983 | 22.55 | 26.57 | 32.97 | b | 36.28 | a | 43.26 | 51.57 | 60.39 | 58.61 | 55.37 | 42.77 | 33.17 | 23.29 | 40.57 | |||||||||||
1984 | 19.90 | 17.45 | 28.90 | 36.40 | 50.29 | 59.57 | 63.16 | 59.77 | 52.67 | 41.90 | 29.47 | 28.53 | a | 40.67 | ||||||||||||
1985 | 24.16 | 26.07 | 33.97 | 42.33 | 49.23 | 59.50 | 61.84 | 61.23 | 55.23 | 43.65 | 34.93 | 19.45 | 42.63 | |||||||||||||
1986 | 20.35 | 32.07 | a | 32.87 | 44.03 | a | 49.00 | 60.83 | 63.19 | 64.23 | 55.50 | 41.61 | 31.43 | 26.40 | a | 43.46 | ||||||||||
1987 | 20.68 | 26.96 | 29.74 | 36.53 | 49.03 | 56.33 | 63.00 | 61.00 | 51.67 | 44.39 | 27.93 | 18.40 | a | 40.47 | ||||||||||||
1988 | 24.23 | 30.00 | 30.06 | 37.70 | 47.90 | 58.10 | 63.32 | 63.58 | 50.83 | 42.77 | 29.37 | 21.84 | 41.64 | |||||||||||||
1989 | 20.48 | 30.11 | 32.65 | 41.72 | a | 48.65 | e | 57.30 | 64.23 | 62.82 | c | 53.97 | 39.52 | 26.13 | 15.39 | 41.08 | ||||||||||
1990 | 19.79 | c | 23.79 | 33.40 | a | 43.76 | a | 50.79 | b | 64.59 | a | 63.32 | 57.73 | a | 56.27 | 34.93 | c | 30.03 | a | 20.00 | b | 41.53 | ||||
1991 | ----- | z | 27.32 | 30.30 | a | 40.27 | 48.32 | 56.60 | 62.35 | 61.74 | 54.07 | 41.06 | 26.63 | 25.17 | a | 43.08 | a | |||||||||
1992 | 22.56 | d | 27.07 | 31.87 | a | 40.47 | 51.20 | a | 53.67 | 61.13 | 59.90 | a | 53.60 | 41.00 | a | 22.62 | a | 26.03 | a | 40.93 | ||||||
1993 | 29.60 | a | 27.48 | a | 30.52 | 37.14 | a | 47.65 | 57.03 | 66.03 | a | 61.77 | 50.33 | 36.93 | a | 25.60 | 17.54 | c | 40.64 | |||||||
1994 | 17.28 | b | 23.73 | b | 32.28 | b | 39.48 | a | 48.58 | 62.48 | a | 65.07 | a | 64.87 | 53.97 | a | 39.97 | a | 29.11 | c | 24.81 | e | 41.80 | |||
1995 | 23.62 | b | 30.19 | a | 36.35 | 35.57 | b | 48.32 | 58.40 | 60.45 | 64.68 | 55.27 | 38.42 | 29.37 | 22.65 | e | 41.94 | |||||||||
1996 | 21.13 | a | 31.14 | 29.03 | a | 39.13 | 50.68 | 61.73 | 65.97 | 61.42 | 52.93 | 42.13 | 27.87 | 19.26 | d | 41.87 | ||||||||||
1997 | 22.57 | c | 25.96 | a | 32.55 | 39.07 | 50.97 | b | 57.03 | 65.10 | 62.42 | 57.93 | 39.13 | 26.40 | 19.24 | b | 41.53 | |||||||||
1998 | 22.37 | a | 25.28 | c | 29.34 | b | 34.53 | 48.03 | 54.50 | 64.67 | a | 61.90 | a | 58.20 | 46.17 | a | 31.83 | 23.27 | a | 41.67 | ||||||
1999 | 22.03 | 23.75 | 33.87 | 37.41 | a | 49.40 | a | 56.37 | 65.03 | 62.48 | 56.33 | 38.06 | 27.00 | a | 17.83 | a | 40.80 | |||||||||
2000 | 21.37 | a | 25.29 | a | 30.82 | c | 41.31 | a | 54.77 | a | 61.80 | 64.87 | a | 62.03 | 53.63 | 43.39 | 26.30 | 20.60 | a | 42.18 | ||||||
2001 | 18.67 | a | 26.43 | 31.84 | 40.80 | 50.58 | 59.93 | 65.35 | 61.65 | 54.27 | 41.10 | 32.23 | 16.52 | b | 41.61 | |||||||||||
2002 | 22.35 | 23.30 | a | 30.57 | a | 44.40 | 50.74 | 62.57 | 64.52 | 64.23 | a | 56.41 | a | 42.90 | 27.07 | 24.96 | c | 42.84 | ||||||||
2003 | 23.52 | 29.00 | 33.13 | 38.80 | 51.13 | 57.93 | 66.76 | b | 63.71 | 55.31 | a | 43.68 | 31.69 | a | 17.57 | a | 42.68 | |||||||||
2004 | 22.35 | 20.41 | b | 36.74 | 43.07 | 51.73 | a | 59.28 | a | 62.21 | b | 59.97 | 53.78 | c | 45.67 | a | 30.66 | a | 21.87 | h | 44.17 | a | ||||
2005 | 27.17 | a | 34.61 | 33.61 | 39.67 | 50.94 | 59.33 | 65.32 | 63.73 | a | 56.79 | a | 44.68 | 27.97 | a | 20.68 | 43.71 | |||||||||
2006 | 19.77 | a | 26.11 | 35.37 | a | 42.43 | 50.97 | 62.17 | 66.67 | a | 64.26 | 53.00 | 41.90 | a | 29.93 | 20.32 | 42.74 | |||||||||
2007 | 24.47 | a | 26.67 | a | 31.77 | 39.23 | 49.97 | 57.70 | 63.30 | a | 65.06 | 57.97 | a | 41.06 | 30.03 | 24.67 | a | 42.66 | ||||||||
2008 | 20.53 | a | 25.41 | 30.06 | 38.17 | 48.16 | 60.63 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.16 | f | |||||
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.00 | 61.45 | 52.03 | 41.44 | d | 25.55 | a | 20.50 | a | 44.50 | f | |||
2010 | 20.13 | 26.57 | 26.84 | 42.60 | 46.94 | 61.30 | 63.93 | b | 62.68 | 56.37 | 41.19 | 28.15 | d | 25.17 | a | 41.82 | ||||||||||
2011 | 16.52 | 24.96 | d | 34.37 | a | 42.07 | 46.90 | 60.27 | 67.55 | b | 66.23 | 56.40 | 38.84 | 28.30 | c | 21.36 | c | 41.98 | ||||||||
2012 | 23.39 | 25.03 | 28.52 | 41.73 | 49.29 | 59.13 | 65.55 | 62.90 | 54.13 | 40.29 | 27.77 | 18.35 | 41.34 | |||||||||||||
2013 | 14.87 | 18.89 | 30.68 | f | 40.67 | 50.00 | 63.03 | 64.33 | d | 62.93 | a | 56.83 | 36.00 | a | 30.14 | b | 22.00 | 41.79 | a | |||||||
2014 | 17.29 | 30.23 | f | 32.74 | 38.37 | 44.93 | c | 62.90 | a | 65.77 | 61.84 | 59.71 | b | 42.17 | a | 28.48 | a | 20.50 | i | 45.42 | b | |||||
2015 | 23.52 | j | 24.45 | h | 35.53 | p | 41.00 | v | 49.82 | i | 62.09 | h | 63.39 | h | 63.34 | b | 59.88 | m | 49.33 | s | 27.50 | f | 21.66 | b | 42.50 | j |
2016 | 20.68 | 23.45 | 33.40 | a | 40.03 | 47.64 | c | 62.27 | 66.90 | b | 61.75 | c | 58.00 | a | 47.10 | 34.77 | 26.10 | 43.51 | ||||||||
2017 | 29.61 | c | 31.75 | 36.32 | 42.40 | 50.27 | a | 60.71 | b | 65.97 | a | 63.13 | 57.07 | 44.60 | a | 36.00 | 21.48 | 44.94 | ||||||||
2018 | 15.43 | a | 31.18 | 35.38 | e | 47.10 | a | 50.67 | a | 64.80 | 66.35 | 64.29 | 57.03 | a | 47.45 | 27.47 | 30.50 | y | 46.11 | a | ||||||
2019 | 20.17 | y | 24.78 | a | 35.03 | 42.39 | b | 46.87 | 58.14 | a | 64.39 | 63.96 | f | 60.10 | 42.23 | 28.80 | 23.63 | a | 42.64 | b | ||||||
2020 | 24.43 | a | 25.92 | e | 37.74 | ----- | z | 50.73 | e | 58.31 | n | 67.53 | a | ----- | z | 51.69 | a | 39.03 | 30.69 | a | 16.31 | b | 38.23 | c | ||
2021 | 18.55 | 24.08 | b | 29.42 | e | 42.39 | b | 51.35 | 60.74 | c | 65.03 | a | 63.83 | a | 56.33 | 41.03 | a | 28.23 | 25.04 | c | 42.17 | |||||
2022 | 17.37 | a | 20.15 | a | 28.48 | b | 40.50 | d | 50.43 | c | 62.93 | c | 68.14 | i | 64.14 | j | 55.59 | c | 43.79 | g | 24.04 | g | 25.07 | a | 37.56 | d |
2023 | 24.20 | a | 23.40 | c | 32.10 | 37.31 | a | 51.07 | b | 58.93 | a | 69.96 | c | 65.46 | c | 56.32 | b | 44.83 | b | 30.89 | c | 22.24 | b | 43.06 | ||
2024 | 23.97 | 29.25 | a | 34.67 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.29 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.99 | 25.47 | 31.50 | 39.68 | 48.71 | 58.71 | 64.14 | 61.98 | 54.71 | 41.31 | 28.26 | 21.76 | 41.43 | |||||||||||||
S.D. | 3.49 | 3.94 | 2.77 | 3.19 | 2.50 | 2.79 | 2.11 | 2.09 | 2.68 | 3.30 | 3.49 | 3.42 | 1.32 | |||||||||||||
SKEW | -0.07 | -0.27 | -0.18 | 0.71 | -0.01 | -0.08 | -0.04 | -0.17 | 0.70 | 0.11 | -0.06 | -0.07 | -0.40 | |||||||||||||
MAX | 29.61 | 34.61 | 37.74 | 52.41 | 56.77 | 65.12 | 69.96 | 66.23 | 65.59 | 50.83 | 38.37 | 28.53 | 44.94 | |||||||||||||
MIN | 12.68 | 14.54 | 24.52 | 33.30 | 42.90 | 51.57 | 57.65 | 57.29 | 49.03 | 34.68 | 19.67 | 14.97 | 37.18 | |||||||||||||
YRS | 79 | 83 | 80 | 82 | 82 | 79 | 81 | 80 | 80 | 81 | 81 | 80 | 63 |