YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.48 | 28.67 | 23.74 | 30.30 | i | |||
1938 | 20.39 | 20.29 | 22.97 | 32.23 | 38.52 | 49.33 | 56.19 | 56.32 | 50.10 | 36.33 | a | 18.60 | 21.29 | 35.21 | ||||||||||||
1939 | 17.52 | 11.00 | a | 25.61 | 33.90 | a | 41.81 | 46.76 | a | 58.06 | 56.84 | 48.43 | 35.81 | 29.83 | 24.94 | 35.88 | ||||||||||
1940 | 20.61 | 23.41 | 28.00 | 32.73 | 44.32 | 52.17 | 59.94 | 58.10 | 46.40 | 39.26 | 23.70 | 22.84 | 37.62 | |||||||||||||
1941 | 20.42 | 33.44 | a | ----- | z | 31.29 | w | 39.39 | 45.63 | 57.90 | 52.48 | 40.87 | 31.19 | 28.10 | 21.74 | 37.12 | b | |||||||||
1942 | 18.19 | 18.63 | a | 19.68 | 28.13 | 31.33 | a | 45.47 | 60.55 | 57.16 | 48.97 | 37.13 | 22.03 | 22.41 | b | 34.14 | ||||||||||
1943 | 18.74 | 20.93 | 26.68 | 37.10 | 37.87 | 43.93 | 56.06 | 56.42 | 49.73 | 37.58 | 24.47 | 18.45 | 35.66 | |||||||||||||
1944 | 13.87 | 15.03 | 19.10 | 27.33 | 36.68 | 41.00 | ----- | z | ----- | z | ----- | z | 41.14 | x | 23.07 | a | 18.74 | 24.35 | d | |||||||
1945 | 18.74 | 20.04 | d | 13.86 | x | ----- | z | 37.12 | g | 41.27 | 55.61 | 53.16 | 41.66 | a | 36.48 | 22.70 | 15.16 | 33.87 | c | |||||||
1946 | 13.35 | 14.82 | 22.19 | 32.43 | 35.23 | 47.03 | 53.90 | 52.90 | 42.10 | 25.32 | 22.39 | g | 23.45 | b | 32.98 | a | ||||||||||
1947 | 13.24 | n | 21.45 | q | 28.47 | a | 30.33 | 42.61 | 43.87 | 55.74 | 54.32 | 47.43 | 36.81 | 18.63 | 15.35 | e | 37.36 | b | ||||||||
1948 | 16.47 | a | 15.18 | a | 15.32 | 30.37 | 36.48 | 46.46 | b | 55.84 | 55.58 | 46.31 | a | 33.50 | c | 18.31 | a | 12.73 | e | 31.88 | ||||||
1949 | -2.18 | i | ----- | z | 19.70 | h | 30.50 | f | 35.80 | f | 44.41 | c | 49.77 | a | 46.93 | d | 42.57 | 22.48 | j | ----- | z | ----- | z | 45.92 | h | |
1950 | ----- | z | ----- | z | 20.80 | u | 21.11 | b | 26.13 | a | 34.38 | a | 43.50 | a | ----- | z | 32.66 | a | 26.42 | l | 14.57 | b | 10.81 | d | 26.17 | e |
1951 | 5.84 | 16.64 | 18.29 | 30.40 | 35.36 | i | 48.87 | o | 52.00 | v | 52.63 | d | 46.23 | 32.23 | 22.83 | 15.52 | 26.73 | c | ||||||||
1952 | 16.10 | 17.59 | 19.03 | 32.60 | 40.26 | 46.33 | 55.42 | 56.58 | 49.73 | 41.10 | 19.27 | 19.06 | 34.42 | |||||||||||||
1953 | 25.94 | 19.46 | 25.06 | 28.73 | 32.00 | 44.83 | 57.90 | 53.16 | 48.40 | 35.16 | 28.43 | 16.77 | a | 34.65 | ||||||||||||
1954 | 18.42 | 22.57 | 18.65 | 33.30 | 40.10 | 43.00 | 56.94 | 52.32 | 44.53 | 34.87 | 28.20 | 15.33 | a | 34.02 | ||||||||||||
1955 | 9.90 | 10.43 | 18.81 | 25.03 | 36.10 | 47.83 | 54.06 | 57.29 | 48.50 | 37.29 | 23.03 | 24.52 | 32.73 | |||||||||||||
1956 | 24.57 | a | 14.03 | 25.29 | 31.07 | 40.52 | 51.27 | 56.58 | 53.52 | 50.33 | 35.16 | 21.73 | 19.42 | 35.29 | ||||||||||||
1957 | 12.94 | 26.96 | 26.77 | 31.13 | 36.68 | 49.63 | 56.35 | 58.19 | 46.93 | 34.94 | 19.53 | 23.55 | 35.30 | |||||||||||||
1958 | 20.61 | 26.43 | 21.87 | 29.30 | 44.29 | 50.63 | 56.32 | 57.90 | 48.57 | 40.03 | 28.07 | 27.97 | 37.67 | |||||||||||||
1959 | 22.35 | 20.36 | 25.32 | 34.77 | 37.19 | 52.87 | 59.35 | 56.55 | 45.17 | 38.16 | 27.40 | 21.74 | 36.77 | |||||||||||||
1960 | 15.19 | 16.14 | 28.45 | 33.43 | 40.52 | 52.20 | 59.35 | 55.55 | 50.33 | 36.84 | 27.57 | 19.58 | 36.26 | |||||||||||||
1961 | 20.52 | 23.32 | 25.52 | 32.50 | 41.13 | 54.40 | 59.35 | 56.16 | 43.63 | 35.00 | 23.37 | 18.16 | 36.09 | |||||||||||||
1962 | 15.71 | 23.39 | 20.32 | 35.80 | 38.58 | 49.63 | 57.26 | 57.00 | 50.83 | 40.84 | 30.63 | 23.23 | 36.94 | |||||||||||||
1963 | 15.52 | 28.93 | 23.55 | 28.07 | 43.87 | 44.07 | 58.58 | 57.35 | 51.77 | 43.23 | 28.33 | 20.10 | 36.95 | |||||||||||||
1964 | 16.00 | 15.28 | 19.10 | 29.90 | 39.29 | 45.50 | 60.16 | 54.52 | 45.47 | 38.45 | 23.27 | 17.97 | a | 33.74 | ||||||||||||
1965 | 20.71 | 20.21 | 21.58 | 32.03 | 37.27 | a | 46.31 | a | 56.48 | 52.42 | 41.43 | 40.42 | 31.97 | 22.48 | 35.28 | |||||||||||
1966 | 16.84 | 17.11 | 26.45 | 32.47 | 44.10 | 49.07 | 60.55 | 57.35 | 49.83 | 35.84 | 29.77 | 19.90 | 36.61 | |||||||||||||
1967 | 20.84 | 22.46 | 28.42 | 26.70 | 39.81 | 44.50 | 59.35 | 59.19 | 48.67 | 38.74 | 30.47 | 14.58 | 36.14 | |||||||||||||
1968 | 20.40 | a | 26.83 | 27.35 | 28.67 | 37.90 | 49.17 | 56.87 | 49.81 | 44.97 | 36.13 | 24.87 | 17.55 | 35.04 | ||||||||||||
1969 | 24.83 | a | 17.30 | a | 20.87 | 32.27 | 45.29 | 46.57 | 56.39 | 59.03 | 50.07 | 31.52 | 27.50 | 23.23 | 36.24 | |||||||||||
1970 | 22.00 | 26.68 | 23.29 | 26.00 | 39.71 | 47.40 | 55.61 | 58.61 | 42.30 | 33.71 | 28.80 | 18.84 | 35.25 | |||||||||||||
1971 | 20.74 | 21.14 | 24.16 | 30.33 | 37.06 | 47.93 | 57.61 | 57.32 | 41.23 | 31.84 | 23.23 | 14.77 | 33.95 | |||||||||||||
1972 | 18.61 | 23.76 | 31.32 | 31.47 | 40.77 | 49.87 | 56.52 | 52.68 | 42.97 | 35.42 | 22.63 | 15.48 | 35.12 | |||||||||||||
1973 | 16.13 | 21.46 | 21.94 | 30.07 | 43.23 | 49.77 | 54.68 | 57.13 | 43.57 | 35.90 | a | 25.47 | 21.90 | 35.10 | ||||||||||||
1974 | 16.35 | 18.36 | 29.42 | 30.23 | 43.30 | a | 53.17 | 56.81 | 53.84 | 49.52 | a | 37.71 | 27.50 | 18.32 | 36.21 | |||||||||||
1975 | 18.29 | 20.26 | a | 20.77 | a | 25.17 | 36.77 | 46.63 | 58.17 | a | 54.42 | 48.43 | 36.10 | 23.86 | a | 23.84 | 34.39 | |||||||||
1976 | 19.97 | 24.59 | 20.23 | 30.27 | 43.55 | 49.07 | 59.16 | 51.94 | 47.67 | 36.63 | a | 29.67 | 22.16 | 36.24 | ||||||||||||
1977 | 17.84 | 23.36 | 20.55 | 36.03 | 36.29 | 53.23 | 56.87 | 55.68 | 48.43 | 40.42 | 28.13 | 26.00 | 36.90 | |||||||||||||
1978 | 22.35 | 24.00 | b | 31.35 | 30.80 | 36.26 | 47.37 | 57.19 | 55.68 | 45.43 | 40.42 | 24.63 | 14.87 | 35.86 | ||||||||||||
1979 | 11.97 | 21.64 | 26.26 | 33.00 | 41.52 | 49.87 | 58.52 | 55.06 | 52.50 | 41.39 | 23.03 | 24.33 | a | 36.59 | ||||||||||||
1980 | 20.06 | 25.17 | 23.29 | 32.63 | 36.29 | 48.00 | 58.39 | 54.87 | 48.10 | 37.55 | 30.17 | 27.23 | 36.81 | |||||||||||||
1981 | 22.81 | 22.46 | 26.61 | 34.70 | 39.52 | 52.07 | 58.87 | 59.48 | 50.30 | 33.52 | 30.63 | 25.13 | a | 38.01 | ||||||||||||
1982 | 16.42 | 19.89 | 24.42 | 29.31 | a | 39.13 | 48.58 | d | 54.45 | 58.34 | b | 45.72 | a | 34.10 | a | 24.13 | 18.42 | 34.41 | ||||||||
1983 | 23.58 | 23.71 | 27.93 | a | 27.03 | 37.84 | 47.18 | b | 55.13 | a | 55.28 | b | 49.07 | a | 38.74 | 27.03 | 20.63 | a | 36.10 | |||||||
1984 | 16.87 | 19.48 | 24.61 | 28.73 | 42.87 | 47.33 | 57.06 | 55.73 | a | 48.48 | a | 31.74 | 27.47 | 18.03 | a | 34.87 | ||||||||||
1985 | 15.35 | 15.50 | 24.32 | 37.80 | 43.13 | 52.57 | 58.94 | 55.84 | 42.67 | 36.79 | b | 23.23 | 20.97 | a | 35.59 | |||||||||||
1986 | 25.73 | a | 26.57 | 32.13 | 33.07 | 39.60 | a | 53.36 | b | 54.53 | a | 58.73 | a | 41.83 | 35.35 | 28.30 | 21.72 | b | 37.58 | |||||||
1987 | 16.48 | b | 22.14 | 25.94 | ----- | z | ----- | z | ----- | z | ----- | z | 55.00 | a | 48.46 | b | 41.42 | 26.90 | 17.55 | 31.74 | d | |||||
1988 | 16.81 | 22.72 | 25.16 | 34.62 | a | 39.81 | 53.50 | 60.61 | 56.03 | a | 46.33 | 44.23 | 27.00 | 16.68 | 36.96 | |||||||||||
1989 | 15.16 | 16.29 | 30.94 | 36.66 | a | 41.73 | a | 49.13 | 60.58 | 53.97 | 47.03 | a | 36.61 | 28.10 | 21.52 | 36.48 | ||||||||||
1990 | 20.94 | 17.50 | 28.77 | 36.59 | a | 39.13 | 49.55 | a | 59.03 | a | 56.16 | 51.87 | 37.10 | 25.97 | 11.23 | 36.15 | ||||||||||
1991 | 18.55 | 27.57 | 25.48 | 29.53 | 36.16 | 48.47 | 59.03 | 56.39 | 48.03 | 39.03 | 25.77 | 20.13 | 36.18 | |||||||||||||
1992 | 19.03 | 26.72 | 30.65 | 38.00 | 45.45 | ----- | z | 54.77 | 56.29 | 47.53 | 40.65 | 22.73 | 17.06 | 36.26 | a | |||||||||||
1993 | 16.97 | 18.43 | 29.97 | 31.90 | 43.19 | 45.73 | 52.13 | 53.77 | 46.57 | 36.90 | 23.14 | b | 19.87 | 34.88 | ||||||||||||
1994 | 23.73 | a | 19.57 | 29.74 | 34.52 | a | 42.58 | 52.83 | a | 58.90 | 58.27 | a | 50.27 | 34.97 | 20.28 | a | 22.65 | 37.36 | ||||||||
1995 | 21.97 | 29.75 | 27.06 | 32.43 | 36.32 | 43.66 | a | 55.19 | 57.39 | 48.44 | e | 36.93 | a | 30.73 | d | 29.18 | n | 38.17 | a | |||||||
1996 | 21.82 | c | 24.24 | 27.55 | 32.50 | 41.52 | 51.90 | a | 60.53 | a | 57.53 | a | 46.72 | a | 36.83 | a | 28.20 | 22.52 | 37.66 | |||||||
1997 | ----- | z | 20.54 | 27.19 | d | 30.10 | 45.04 | d | 50.93 | a | 54.10 | 58.65 | ----- | z | ----- | z | ----- | z | ----- | z | 40.93 | e | ||||
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.65 | 49.07 | a | 34.61 | 27.90 | a | 16.86 | b | 37.42 | g | ||
1999 | 23.17 | a | 22.86 | 27.32 | 26.62 | d | 37.23 | a | 49.17 | a | 58.30 | a | 55.16 | 45.32 | b | 38.28 | b | 32.62 | a | 20.53 | a | 36.38 | ||||
2000 | 24.57 | a | 26.69 | 27.03 | 37.14 | b | 44.29 | c | 52.97 | a | 60.17 | a | 57.55 | 46.33 | 36.87 | a | 18.93 | a | 23.23 | 37.98 | ||||||
2001 | 18.69 | b | 19.54 | 28.80 | a | 31.67 | 46.23 | a | 51.93 | 58.97 | a | 58.60 | a | 50.85 | d | 40.06 | 28.57 | b | 16.30 | a | 37.52 | |||||
2002 | 16.94 | 18.37 | a | 22.87 | 34.13 | 40.00 | a | 52.67 | 62.16 | 56.03 | b | 48.64 | b | 34.47 | a | 25.87 | 21.19 | 36.11 | ||||||||
2003 | 27.90 | a | 19.82 | 28.23 | 31.00 | b | 42.10 | 51.90 | a | 62.84 | 58.57 | a | 48.10 | a | 42.55 | 22.63 | 21.74 | d | 38.11 | |||||||
2004 | 17.07 | b | 19.25 | a | 31.46 | c | 33.71 | b | 41.40 | a | 51.62 | a | 58.94 | 53.86 | c | 45.37 | c | 38.37 | a | 24.83 | a | 21.71 | c | 36.47 | ||
2005 | 23.00 | b | 21.82 | 26.84 | 31.03 | 40.13 | a | 45.71 | b | 59.68 | 55.93 | a | 46.14 | a | 36.50 | a | 27.40 | 22.43 | c | 36.38 | ||||||
2006 | 20.42 | e | 18.85 | a | 21.30 | a | 32.57 | 44.00 | 52.03 | 59.52 | 55.73 | a | 43.71 | b | 34.13 | 26.93 | 18.58 | 35.65 | ||||||||
2007 | 12.16 | 22.19 | a | 29.53 | a | 34.12 | d | 44.07 | a | 52.57 | 62.68 | 58.52 | d | 45.65 | d | 34.48 | h | 28.27 | d | 14.87 | 36.78 | a | ||||
2008 | 13.21 | b | 18.52 | 23.11 | c | 26.86 | b | 38.69 | b | 50.25 | b | 60.30 | a | 57.27 | a | 47.69 | a | 36.50 | a | 30.97 | a | 18.73 | e | 35.17 | ||
2009 | 20.93 | d | 21.00 | 25.10 | 30.40 | 42.56 | d | 45.96 | b | 59.40 | k | 55.06 | 48.41 | a | 32.15 | e | 27.04 | b | 12.60 | a | 32.84 | a | ||||
2010 | 20.31 | b | 20.89 | 25.30 | a | 29.46 | b | 34.03 | a | 49.41 | c | 57.71 | c | 53.18 | c | 47.65 | d | 38.45 | 23.81 | c | 22.53 | a | 35.23 | |||
2011 | 18.30 | a | 15.07 | 26.45 | 29.76 | a | 35.17 | b | 45.50 | d | 57.21 | b | 53.35 | 50.41 | a | 37.87 | a | 23.96 | b | 17.63 | a | 34.22 | ||||
2012 | 20.86 | b | 19.10 | 28.83 | a | 34.82 | b | 41.45 | 49.55 | a | 56.80 | a | 57.65 | 49.79 | a | 38.32 | 30.38 | a | 19.93 | c | 37.29 | |||||
2013 | 14.50 | a | 17.74 | a | 28.77 | 30.80 | 37.77 | a | 46.59 | a | 52.68 | 51.38 | b | 44.33 | 33.13 | 27.38 | a | 16.25 | c | 33.44 | ||||||
2014 | 23.07 | a | 24.96 | 28.48 | 31.57 | 38.14 | b | 41.96 | d | 60.00 | c | 52.76 | b | 49.81 | c | 39.28 | f | 27.07 | a | 22.86 | b | 36.43 | a | |||
2015 | 24.27 | a | 27.82 | 30.23 | 32.77 | 39.61 | 55.30 | 56.07 | a | 56.76 | b | 53.45 | a | 42.00 | 21.83 | 18.32 | 38.20 | |||||||||
2016 | 18.26 | 24.36 | a | 30.03 | 34.27 | 38.81 | 54.70 | 59.27 | a | 56.61 | 46.72 | a | 39.03 | 28.93 | a | 16.61 | c | 37.30 | ||||||||
2017 | 17.06 | 23.79 | d | 33.00 | c | 31.90 | a | 39.84 | 53.87 | 60.53 | a | 56.78 | d | 47.31 | a | 34.03 | 32.14 | b | 22.17 | b | 37.70 | |||||
2018 | 24.25 | c | 18.96 | a | 25.32 | f | 34.97 | 41.27 | a | 51.48 | a | 60.83 | a | 58.19 | j | 50.62 | a | 35.16 | f | 23.18 | s | 20.58 | s | 40.34 | e | |
2019 | ----- | z | 18.08 | p | 26.45 | k | 36.87 | o | 36.79 | c | 45.89 | c | 58.03 | 58.00 | 48.50 | 26.90 | 28.36 | b | 20.77 | a | 40.40 | d | ||||
2020 | 21.57 | a | 18.32 | a | 26.66 | b | 31.57 | 41.65 | 50.23 | 59.94 | 60.61 | 50.67 | 39.79 | b | 27.33 | 18.23 | 37.21 | |||||||||
2021 | 19.03 | a | 21.96 | 24.52 | 31.13 | 38.83 | a | 54.17 | 59.62 | o | 59.04 | h | 51.61 | b | 36.32 | 32.33 | 23.65 | 33.36 | b | |||||||
2022 | 20.90 | b | 17.85 | a | 28.52 | 32.43 | 39.32 | 53.10 | 63.34 | b | 59.62 | b | 54.93 | 40.73 | a | 16.53 | 19.48 | 37.23 | ||||||||
2023 | 15.87 | 13.21 | 18.58 | 29.57 | 41.13 | a | 49.10 | a | 61.73 | e | 56.72 | b | 48.46 | f | 38.52 | 31.68 | e | 25.68 | 34.71 | a | ||||||
2024 | 23.77 | 24.79 | a | 28.26 | 32.88 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.61 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.99 | 20.97 | 25.49 | 31.52 | 39.72 | 48.73 | 57.64 | 55.87 | 47.27 | 36.82 | 25.90 | 19.84 | 35.95 | |||||||||||||
S.D. | 3.90 | 4.30 | 3.90 | 3.13 | 3.47 | 3.78 | 2.99 | 2.42 | 3.41 | 3.31 | 3.90 | 3.62 | 1.36 | |||||||||||||
SKEW | -0.42 | 0.11 | -0.38 | -0.38 | -0.79 | -0.73 | -1.44 | -0.82 | -1.03 | -0.63 | -0.56 | -0.24 | -0.55 | |||||||||||||
MAX | 27.90 | 33.44 | 33.00 | 38.00 | 46.23 | 55.30 | 63.34 | 60.61 | 54.93 | 44.23 | 32.62 | 27.97 | 38.20 | |||||||||||||
MIN | 5.84 | 10.43 | 15.32 | 21.11 | 26.13 | 34.38 | 43.50 | 46.93 | 32.66 | 25.32 | 14.57 | 10.81 | 31.88 | |||||||||||||
YRS | 81 | 82 | 80 | 80 | 81 | 82 | 80 | 82 | 83 | 80 | 83 | 83 | 66 |