YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.60 | u | 24.37 | 22.19 | 23.28 | j | ||
1941 | 22.81 | 24.85 | a | 25.97 | 33.83 | 45.90 | 51.10 | 55.55 | 53.65 | 46.23 | 37.52 | 26.70 | 19.43 | a | 36.96 | |||||||||||
1942 | 13.52 | 14.68 | 21.55 | 33.41 | a | 39.68 | 50.48 | c | 53.65 | 54.42 | 42.59 | c | 36.31 | b | 26.92 | d | 17.84 | f | 35.20 | a | ||||||
1943 | 17.22 | d | 21.56 | a | 22.50 | c | 36.60 | 39.77 | 49.63 | 56.33 | a | 58.06 | 45.97 | 33.58 | 22.76 | a | 17.13 | 35.09 | ||||||||
1944 | 17.04 | c | 19.62 | 20.16 | 29.33 | 42.71 | 48.97 | 55.16 | 56.29 | 46.87 | 38.58 | 26.47 | 18.87 | 35.01 | ||||||||||||
1945 | 14.94 | 20.92 | b | 22.72 | b | 27.27 | 41.48 | 47.07 | 55.10 | b | 55.87 | 45.13 | 36.94 | 23.90 | 14.97 | a | 33.86 | |||||||||
1946 | 15.29 | 18.64 | 26.00 | 37.80 | 38.94 | 51.87 | 55.71 | g | 55.84 | 50.00 | g | 37.86 | b | 25.30 | c | 22.00 | g | 34.17 | c | |||||||
1947 | 16.21 | b | 16.23 | b | 22.17 | a | 30.76 | e | 43.21 | b | 47.29 | i | 55.57 | c | 55.38 | b | 50.27 | d | 40.63 | a | 20.14 | b | 16.93 | a | 33.41 | a |
1948 | 15.55 | b | 17.15 | b | 19.21 | b | 35.71 | b | 42.62 | b | 51.72 | a | 55.55 | b | 54.62 | b | 48.25 | b | 36.33 | a | 21.82 | b | 18.04 | d | 34.72 | |
1949 | 11.83 | a | 19.19 | b | 25.03 | b | 34.68 | e | 40.86 | i | 50.82 | h | 56.73 | e | 54.28 | f | 47.73 | d | 34.33 | a | 30.61 | g | 16.07 | a | 30.70 | d |
1950 | 17.77 | 23.25 | 19.85 | k | ----- | z | 42.15 | r | 51.33 | f | 54.73 | e | 52.30 | d | 48.18 | b | 42.68 | c | 25.46 | b | 20.57 | c | 35.62 | d | ||
1951 | 16.13 | 20.11 | a | 21.41 | d | 29.31 | d | 43.44 | d | 49.16 | e | 57.71 | c | 55.70 | a | 45.32 | b | 37.23 | e | 21.48 | c | 16.96 | c | 34.50 | ||
1952 | 21.23 | a | 21.84 | d | 21.41 | d | 33.25 | b | 42.37 | a | 54.59 | a | 55.14 | b | 57.70 | d | 47.88 | e | 35.90 | b | 20.46 | b | 17.69 | b | 35.79 | |
1953 | 25.10 | 18.71 | 28.73 | e | 30.46 | b | 37.23 | e | 53.89 | c | 57.55 | 54.20 | a | 48.34 | a | 38.37 | a | 28.43 | b | 17.83 | a | 36.57 | ||||
1954 | 19.70 | a | 25.48 | c | 22.62 | e | 38.29 | i | 42.85 | d | 50.75 | f | 59.52 | 56.03 | 51.00 | n | 39.33 | d | 28.86 | a | 21.00 | c | 35.04 | c | ||
1955 | 17.60 | a | 15.15 | a | 18.33 | p | 35.22 | c | 42.38 | e | 47.44 | e | 50.96 | d | 54.00 | d | 49.15 | c | 37.59 | b | 20.88 | d | 19.04 | d | 35.40 | a |
1956 | 19.10 | b | 13.63 | b | 20.40 | a | 29.57 | g | 43.67 | j | 53.93 | b | 57.93 | b | 53.85 | k | 49.79 | b | 38.47 | a | 23.76 | a | 21.23 | 33.14 | c | |
1957 | 14.75 | c | 26.07 | 23.43 | c | 29.54 | b | 40.97 | b | 50.83 | a | 57.64 | c | 56.28 | b | 45.46 | d | 38.64 | c | 24.89 | c | 22.43 | a | 35.91 | ||
1958 | 17.10 | 22.64 | 22.00 | b | 30.07 | b | 45.55 | b | 52.63 | 55.13 | a | 56.40 | a | 51.24 | a | 37.03 | a | 24.15 | c | 18.21 | g | 37.63 | a | |||
1959 | 14.00 | 18.79 | 20.00 | 29.34 | a | 41.22 | d | 50.10 | 52.69 | b | 54.32 | c | 44.11 | b | 35.11 | c | 22.36 | b | 22.33 | a | 33.70 | |||||
1960 | 16.39 | 16.32 | a | 24.00 | a | 34.11 | c | 41.94 | 53.10 | 55.59 | d | 55.42 | 50.00 | c | 38.50 | e | 27.10 | 20.32 | f | 37.50 | a | |||||
1961 | 17.81 | 21.12 | b | 25.45 | b | 29.93 | a | 41.17 | h | 53.27 | 52.79 | b | 53.00 | b | 40.74 | g | 33.08 | f | 22.72 | a | 16.46 | e | 32.51 | c | ||
1962 | 11.47 | a | 20.68 | c | 19.21 | b | 34.07 | c | 46.30 | d | 46.07 | c | 55.26 | d | 55.16 | 46.54 | b | 39.04 | d | 28.86 | a | 21.14 | b | 35.32 | ||
1963 | 6.93 | b | 22.89 | a | 25.65 | 35.41 | a | 45.17 | a | 52.41 | a | 58.97 | b | 56.67 | a | 52.03 | a | 43.87 | 28.97 | 15.00 | c | 37.00 | ||||
1964 | 15.33 | a | 14.45 | 19.81 | d | 31.52 | a | 44.04 | d | 51.03 | 57.93 | b | 55.63 | a | 48.96 | c | 37.79 | b | 27.43 | b | 18.21 | c | 35.18 | |||
1965 | 21.71 | c | 17.75 | 17.33 | a | 35.86 | a | 42.97 | b | 50.30 | c | 55.31 | b | 52.55 | 45.93 | a | 37.47 | a | 30.73 | 22.72 | b | 35.89 | ||||
1966 | 12.43 | c | 16.42 | b | 25.84 | 31.14 | a | 41.59 | b | 51.48 | a | 58.63 | a | 53.60 | a | 47.81 | c | 34.45 | b | 28.82 | b | 16.00 | 34.85 | |||
1967 | 18.48 | b | 18.70 | a | 27.83 | a | 35.63 | 38.86 | c | 51.24 | a | 57.10 | 53.29 | 46.77 | 36.10 | 26.77 | 15.10 | a | 35.49 | |||||||
1968 | 16.13 | a | 19.43 | a | 23.65 | 28.53 | 39.74 | 51.80 | 55.35 | 53.68 | 44.80 | 36.10 | 26.23 | 17.42 | 34.41 | |||||||||||
1969 | 20.48 | 19.43 | 16.93 | b | 34.97 | 44.55 | 45.63 | 55.58 | 54.87 | 47.23 | 33.03 | 24.83 | 20.42 | 34.83 | ||||||||||||
1970 | 15.52 | 20.64 | 20.26 | 29.43 | 41.94 | 48.70 | 58.42 | 56.29 | 45.43 | 31.55 | 24.70 | 18.61 | 34.29 | |||||||||||||
1971 | 15.74 | 17.54 | 22.45 | 32.23 | 39.45 | 51.70 | 55.65 | 52.48 | 42.59 | a | 35.90 | 27.93 | 21.39 | 34.59 | ||||||||||||
1972 | 16.48 | 20.62 | 28.29 | 34.17 | 41.23 | 52.67 | 54.87 | a | 53.48 | 49.17 | 38.77 | 20.20 | 17.32 | 35.61 | ||||||||||||
1973 | 18.00 | 20.22 | a | 26.26 | 29.07 | 41.29 | 50.30 | 55.03 | 54.19 | 46.28 | a | 37.94 | 28.30 | 18.58 | 35.45 | |||||||||||
1974 | 16.03 | 18.64 | 28.42 | 31.73 | 44.68 | 51.73 | 55.06 | 52.03 | 44.60 | 39.83 | a | 25.33 | 14.90 | 35.25 | ||||||||||||
1975 | 15.97 | 17.11 | 23.45 | 29.67 | 38.94 | 48.76 | a | 53.65 | 54.20 | a | 45.48 | c | 33.84 | 24.47 | 21.29 | 33.90 | ||||||||||
1976 | 17.26 | 23.27 | c | 23.65 | 33.36 | b | ----- | z | 49.47 | 54.71 | 53.13 | 48.86 | a | 31.94 | 21.48 | a | 19.04 | c | 34.20 | a | ||||||
1977 | 14.26 | 19.86 | 23.21 | c | 34.43 | 45.27 | a | 54.57 | 57.26 | 55.84 | 48.57 | 35.39 | ----- | z | 22.35 | 37.36 | a | |||||||||
1978 | 14.29 | 19.54 | 28.61 | 33.90 | 40.10 | 49.87 | 58.74 | 51.90 | 47.00 | 36.06 | 29.20 | 12.58 | 35.15 | |||||||||||||
1979 | 9.29 | 17.61 | 23.03 | 31.43 | 40.32 | 48.30 | 54.65 | 52.81 | 47.80 | 35.97 | 21.00 | 19.03 | 33.44 | |||||||||||||
1980 | 17.68 | 20.93 | 21.58 | 29.10 | 39.23 | 48.73 | 57.42 | 55.45 | 47.60 | 30.94 | 25.20 | 25.00 | 34.90 | |||||||||||||
1981 | 18.48 | 17.14 | 26.26 | 36.00 | 41.97 | 52.93 | 56.58 | 53.68 | 48.83 | 38.26 | 30.57 | 18.87 | a | 36.63 | ||||||||||||
1982 | 17.00 | 15.64 | 24.48 | 30.97 | 40.10 | a | 46.54 | b | 54.74 | 56.77 | 48.07 | 35.19 | 23.87 | 17.42 | 34.23 | |||||||||||
1983 | 20.43 | a | 21.19 | a | 25.21 | b | 26.48 | a | 37.41 | b | 45.87 | 54.69 | e | 55.48 | b | 49.20 | 37.40 | a | 26.00 | 9.35 | 34.06 | |||||
1984 | 14.42 | 17.17 | 21.28 | b | 27.37 | 43.67 | a | 51.07 | a | 55.16 | 55.03 | a | 45.28 | a | 34.71 | 23.50 | j | 22.37 | a | 35.23 | a | |||||
1985 | 14.70 | a | 16.52 | a | 26.20 | a | 34.30 | 43.97 | a | 50.70 | 55.03 | 54.27 | a | 45.69 | a | 36.03 | 21.83 | 14.84 | 34.51 | |||||||
1986 | 20.81 | 19.64 | c | 29.81 | 33.79 | a | 40.97 | 51.74 | c | 55.97 | 54.03 | a | 46.23 | 35.61 | 25.22 | c | 20.00 | 36.15 | ||||||||
1987 | 17.97 | a | 22.29 | 25.10 | b | 33.04 | c | 41.74 | 51.04 | b | 53.96 | d | 54.39 | 45.66 | a | 35.45 | 24.93 | 17.45 | 35.25 | |||||||
1988 | 12.55 | 18.83 | 21.10 | a | 33.17 | a | 41.81 | 52.66 | a | 54.26 | 54.63 | a | 45.73 | 38.03 | b | 25.04 | c | 17.48 | 34.61 | |||||||
1989 | 17.42 | 16.00 | 27.81 | 34.23 | 43.61 | 50.07 | 54.71 | 54.90 | 47.30 | 36.13 | a | 25.86 | a | 14.81 | 35.24 | |||||||||||
1990 | 16.23 | 20.04 | 27.31 | b | 34.07 | 38.61 | 52.53 | 54.27 | a | 53.58 | 50.47 | 35.48 | 26.21 | a | 13.00 | b | 35.15 | |||||||||
1991 | 17.00 | 22.18 | 23.97 | b | 30.77 | 41.90 | 50.70 | 55.07 | a | 55.55 | 47.10 | a | 35.84 | 23.57 | 21.37 | d | 35.42 | |||||||||
1992 | 19.45 | 22.00 | 26.03 | 37.19 | c | 42.23 | 48.43 | 54.58 | 52.77 | 46.80 | 36.90 | 20.83 | a | 17.48 | 35.39 | |||||||||||
1993 | 18.61 | 18.93 | 27.20 | a | 32.10 | 41.23 | a | 50.67 | 56.39 | 54.74 | 44.87 | 33.43 | a | 20.23 | 19.10 | 34.79 | ||||||||||
1994 | 16.87 | 17.71 | 27.52 | 32.66 | a | 45.10 | b | 54.83 | 54.29 | 56.58 | 48.63 | 36.94 | 27.31 | a | 22.83 | a | 36.77 | |||||||||
1995 | 20.35 | 22.75 | 26.87 | a | 30.23 | 39.55 | 49.57 | 53.58 | 57.32 | 48.43 | 34.83 | a | 28.73 | 20.42 | 36.05 | |||||||||||
1996 | 15.00 | 20.41 | 21.67 | a | 32.00 | 46.68 | 54.07 | 56.93 | b | 55.61 | 46.43 | 37.71 | 26.81 | c | 19.65 | 36.08 | ||||||||||
1997 | 16.48 | 19.92 | d | 27.77 | 28.00 | 41.19 | 52.37 | 55.47 | a | 56.16 | 52.14 | a | 38.20 | a | 23.77 | 19.81 | 35.94 | |||||||||
1998 | 21.29 | 21.96 | 25.75 | g | 28.77 | 41.80 | a | 50.37 | 57.63 | a | 54.54 | g | 50.61 | g | 38.10 | 30.28 | a | 18.55 | b | 34.31 | c | |||||
1999 | 22.26 | 20.96 | a | 27.31 | b | 31.17 | 41.10 | a | 49.17 | 57.52 | 56.06 | 46.87 | 36.29 | 29.41 | c | 18.61 | 36.39 | |||||||||
2000 | 18.63 | a | 24.79 | 27.79 | b | 33.31 | a | 45.18 | c | 52.33 | 57.23 | 57.39 | 49.20 | 38.71 | 21.00 | a | 16.68 | 36.85 | ||||||||
2001 | 14.39 | 21.46 | 27.23 | a | 36.10 | a | 45.19 | 51.24 | a | 58.68 | 54.71 | 48.23 | 36.68 | 30.00 | a | 18.07 | a | 36.83 | ||||||||
2002 | 17.53 | a | 16.18 | 22.77 | a | 37.10 | a | 43.10 | 56.62 | a | 58.19 | 57.10 | 50.20 | 36.55 | 27.17 | 19.00 | a | 36.79 | ||||||||
2003 | 24.52 | 20.37 | a | 28.03 | 34.63 | 45.74 | 49.80 | 60.03 | 58.45 | 47.53 | 41.13 | 27.20 | 21.65 | 38.26 | ||||||||||||
2004 | 21.10 | 18.55 | 31.81 | 35.57 | 45.30 | a | 52.50 | 55.81 | 54.13 | 48.20 | 39.48 | 25.74 | g | ----- | z | 40.24 | b | |||||||||
2005 | 23.86 | q | 21.81 | g | 25.08 | g | 31.55 | h | 42.93 | a | 49.50 | 54.68 | 54.55 | 49.78 | c | 38.04 | c | 27.31 | a | 17.47 | a | 41.78 | d | |||
2006 | 21.43 | a | 14.96 | c | 25.71 | 36.30 | 44.86 | b | 53.85 | c | 57.58 | e | 56.43 | a | 43.39 | b | 36.10 | a | 26.96 | b | 19.52 | b | 36.43 | |||
2007 | 13.31 | b | 20.36 | 29.84 | 31.59 | a | 42.00 | c | 49.87 | 56.23 | a | 58.23 | 50.41 | a | 37.79 | b | 26.62 | a | 20.35 | h | 37.84 | a | ||||
2008 | 16.85 | d | 18.48 | b | 26.58 | 31.63 | 41.74 | 52.17 | a | 56.97 | 55.90 | b | 48.48 | a | 39.71 | 28.38 | a | 20.10 | 36.42 | |||||||
2009 | 21.10 | b | 24.46 | 28.28 | b | 33.45 | a | 44.57 | c | 51.86 | a | 57.03 | 54.70 | a | 47.59 | a | 33.63 | a | 30.07 | 15.68 | 36.87 | |||||
2010 | 19.32 | 15.63 | a | 27.23 | 36.13 | 40.55 | b | 55.23 | 57.92 | g | 57.29 | 52.67 | 41.17 | a | 24.66 | a | 25.23 | a | 35.92 | a | ||||||
2011 | 17.16 | 16.14 | 28.97 | 34.90 | a | 39.90 | 54.20 | 60.16 | 59.65 | 49.50 | 38.55 | 28.59 | a | 16.00 | 36.98 | |||||||||||
2012 | 24.63 | a | 21.29 | a | 31.93 | a | 39.71 | b | 45.61 | 56.70 | 59.61 | 56.68 | 49.68 | b | 37.60 | a | ----- | z | ----- | z | 42.34 | b | ||||
2013 | 16.29 | ----- | z | ----- | z | 30.00 | 43.03 | a | ----- | z | 58.06 | 56.10 | a | 52.67 | 36.58 | 26.60 | 18.77 | 37.57 | c | |||||||
2014 | 19.42 | 20.75 | 27.52 | 33.13 | 41.74 | 52.37 | 58.26 | 55.13 | 51.70 | 40.26 | 24.90 | 21.13 | 37.19 | |||||||||||||
2015 | 22.39 | 21.86 | 31.06 | 33.97 | 42.68 | 54.53 | 57.16 | 56.55 | 52.13 | 43.26 | 26.23 | 19.55 | 38.45 | |||||||||||||
2016 | 20.65 | 23.52 | 26.87 | 33.70 | 38.74 | 53.03 | 57.42 | 55.16 | 51.43 | 42.29 | 30.07 | 18.00 | 37.57 | |||||||||||||
2017 | 18.90 | 26.75 | 31.19 | 34.30 | 40.81 | 57.17 | 59.16 | 54.70 | a | 50.80 | 37.90 | 33.30 | 19.84 | 38.74 | ||||||||||||
2018 | 19.87 | 21.25 | 25.94 | 32.90 | 47.26 | 54.57 | 57.65 | 55.81 | 51.17 | 38.52 | 25.66 | a | 19.45 | 37.50 | ||||||||||||
2019 | 21.45 | 18.74 | a | 24.58 | 37.23 | 39.77 | 50.17 | 57.32 | 58.55 | 53.47 | 31.55 | 25.93 | 21.26 | 36.67 | ||||||||||||
2020 | 20.48 | 19.41 | 30.97 | 33.30 | c | 46.23 | a | 53.30 | 58.84 | 57.74 | ----- | z | ----- | z | ----- | z | ----- | z | 40.03 | d | ||||||
2021 | 19.81 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.81 | k | |
2022 | 17.62 | b | 14.85 | b | ----- | z | 31.89 | b | 43.56 | d | 54.59 | a | 59.50 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.00 | f |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.52 | 19.66 | 25.03 | 32.77 | 42.28 | 51.39 | 56.29 | 55.24 | 47.97 | 37.09 | 25.74 | 18.71 | 35.72 | |||||||||||||
S.D. | 3.31 | 2.89 | 3.47 | 2.79 | 2.34 | 2.49 | 1.88 | 1.65 | 2.44 | 2.56 | 2.97 | 2.80 | 1.22 | |||||||||||||
SKEW | -0.25 | 0.14 | -0.15 | -0.09 | 0.08 | -0.08 | -0.03 | 0.18 | 0.10 | 0.10 | -0.09 | -0.39 | 0.37 | |||||||||||||
MAX | 25.10 | 26.75 | 31.93 | 39.71 | 47.26 | 57.17 | 60.16 | 59.65 | 53.47 | 43.87 | 33.30 | 25.23 | 38.74 | |||||||||||||
MIN | 6.93 | 13.63 | 16.93 | 26.48 | 37.23 | 45.63 | 50.96 | 51.90 | 42.59 | 30.94 | 20.14 | 9.35 | 33.44 | |||||||||||||
YRS | 81 | 79 | 75 | 77 | 76 | 76 | 79 | 77 | 75 | 78 | 75 | 73 | 58 |