YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | 32.72 | m | 30.00 | 33.47 | a | 39.23 | 42.90 | 45.83 | 50.90 | 50.81 | 46.93 | 42.41 | d | 39.27 | d | 36.56 | d | 41.66 | a | |||||||
1940 | 33.69 | e | 35.57 | a | 36.77 | 39.21 | a | 44.50 | c | 46.77 | 50.13 | 49.61 | 50.40 | 43.21 | c | 33.27 | d | 34.72 | b | 41.49 | ||||||
1941 | 34.81 | e | 35.43 | e | 38.10 | a | 39.66 | a | 43.32 | 46.17 | 53.48 | 51.06 | 46.10 | 42.37 | a | 36.92 | e | 31.55 | b | 41.58 | ||||||
1942 | 31.08 | g | 32.54 | 32.32 | c | 38.03 | 43.23 | a | 45.96 | b | 54.00 | 51.94 | 47.17 | 44.00 | 35.53 | 34.23 | 41.72 | a | ||||||||
1943 | 25.39 | 34.25 | 32.64 | c | 39.93 | a | 40.68 | 45.53 | 50.65 | 49.60 | a | 47.73 | 41.74 | 37.90 | 32.06 | 39.84 | ||||||||||
1944 | 32.03 | 31.31 | 31.53 | a | 37.87 | 41.81 | 46.53 | 51.06 | 50.32 | 49.40 | 46.00 | 35.93 | 32.87 | 40.56 | ||||||||||||
1945 | 33.42 | 33.07 | 32.42 | 34.80 | 44.27 | a | 45.73 | 50.77 | 49.65 | 45.61 | b | 42.89 | c | 34.52 | a | 32.67 | a | 39.98 | ||||||||
1946 | 32.20 | a | 32.40 | c | 33.70 | a | 37.86 | b | 43.67 | a | 46.10 | 51.00 | 50.71 | 48.37 | c | 37.68 | c | 32.59 | a | 31.61 | 39.82 | |||||
1947 | 26.83 | a | 33.25 | 36.71 | 39.80 | 45.61 | 46.80 | 49.87 | 48.42 | 47.90 | 43.10 | 35.57 | 34.55 | 40.70 | ||||||||||||
1948 | 30.43 | a | 28.83 | 31.97 | a | 34.97 | 42.66 | b | 49.87 | 48.65 | 51.17 | a | 45.00 | 40.65 | 33.03 | 28.71 | 38.83 | |||||||||
1949 | 19.90 | a | 28.25 | 34.58 | 37.63 | 43.74 | 43.70 | 48.16 | 48.88 | f | 47.60 | 37.03 | 42.41 | a | 29.81 | 37.53 | a | |||||||||
1950 | 15.10 | 29.46 | 32.52 | 35.37 | 39.48 | 46.56 | c | 50.29 | 51.71 | 46.23 | 40.60 | a | 35.00 | a | 37.35 | 38.31 | ||||||||||
1951 | 29.74 | 31.39 | 30.14 | b | 36.60 | 41.90 | a | 47.47 | 50.19 | 49.13 | 48.76 | a | 43.42 | 36.97 | 30.10 | a | 39.65 | |||||||||
1952 | 28.39 | 31.83 | 33.35 | 37.60 | 42.29 | 45.10 | 51.30 | a | 51.42 | 48.67 | 45.67 | a | 33.67 | 33.42 | 40.22 | |||||||||||
1953 | 37.03 | 33.04 | 34.61 | 38.23 | 43.35 | 45.90 | 51.03 | a | 52.19 | 48.70 | 43.71 | 38.19 | c | 35.50 | a | 41.79 | ||||||||||
1954 | 28.71 | 34.79 | 31.68 | 35.10 | a | 42.61 | 44.77 | 47.72 | b | 49.55 | 47.90 | 40.74 | 41.21 | a | 34.30 | a | 39.92 | |||||||||
1955 | 32.03 | 29.50 | 28.16 | 34.47 | 39.10 | 46.30 | 49.16 | 47.81 | d | 46.67 | 42.61 | 31.47 | 31.06 | 38.20 | ||||||||||||
1956 | 30.57 | a | 27.72 | 32.10 | 38.27 | 44.77 | 47.23 | 52.13 | 50.66 | b | 47.13 | 40.61 | 34.86 | a | 33.68 | 39.98 | ||||||||||
1957 | 24.16 | 29.56 | a | 35.52 | 38.31 | a | 46.17 | a | 49.63 | 50.19 | 49.55 | 50.80 | 41.97 | 35.30 | 35.10 | 40.52 | ||||||||||
1958 | 36.27 | a | 39.32 | 33.13 | 37.60 | 47.60 | a | 52.27 | 55.13 | 52.26 | 47.37 | 43.81 | 35.57 | 37.48 | 43.15 | |||||||||||
1959 | 32.35 | 30.54 | 33.76 | b | 38.77 | 41.29 | 48.57 | 51.87 | 49.03 | 46.73 | 43.00 | 35.43 | 32.61 | 40.33 | ||||||||||||
1960 | 30.68 | 31.89 | a | 32.87 | 37.77 | 42.03 | 47.13 | 51.35 | 50.81 | 47.03 | 43.10 | b | 34.62 | a | 33.00 | 40.19 | ||||||||||
1961 | 36.47 | a | 35.29 | 35.26 | 37.70 | 42.00 | 49.83 | 52.33 | a | 52.77 | 44.47 | 39.55 | 33.03 | 31.84 | 40.88 | |||||||||||
1962 | 30.58 | 33.14 | 31.77 | 38.72 | a | 40.19 | 45.27 | 48.73 | a | 50.47 | a | 48.23 | 42.77 | 37.73 | 34.03 | 40.14 | ||||||||||
1963 | 24.74 | 38.36 | 33.65 | 36.33 | 42.10 | 46.67 | 48.39 | 50.94 | 50.87 | 43.55 | 36.57 | 33.63 | a | 40.48 | ||||||||||||
1964 | 32.63 | a | 30.45 | 33.39 | 34.33 | 39.13 | 45.79 | a | 49.71 | 49.32 | 45.60 | 44.23 | 32.31 | a | 27.87 | 38.73 | ||||||||||
1965 | 32.74 | 33.43 | 33.84 | 37.79 | a | 39.07 | a | 46.20 | 51.61 | 52.58 | 45.03 | 44.42 | 41.00 | 31.32 | 40.75 | |||||||||||
1966 | 31.68 | 32.50 | 33.65 | 38.27 | 40.97 | 46.07 | 49.81 | 50.26 | 48.77 | 39.84 | 36.97 | a | 36.52 | 40.44 | ||||||||||||
1967 | 34.03 | 32.93 | 32.19 | 33.63 | 42.32 | 50.30 | 50.23 | 53.58 | 49.37 | 43.37 | a | 36.67 | 31.61 | 40.85 | ||||||||||||
1968 | 31.84 | 37.86 | 37.32 | 35.97 | 42.32 | 47.70 | 52.03 | 50.77 | 47.73 | 40.10 | 37.07 | 27.48 | 40.68 | |||||||||||||
1969 | 24.39 | 30.64 | 33.87 | 37.27 | 44.45 | 51.67 | 49.71 | 48.61 | 48.30 | 39.48 | 38.13 | 35.00 | 40.13 | |||||||||||||
1970 | 31.03 | 36.50 | 33.84 | 34.70 | 41.29 | 49.43 | 50.26 | 49.19 | 45.40 | 40.29 | 37.27 | 30.48 | 39.97 | |||||||||||||
1971 | 30.42 | 32.57 | 30.35 | 36.40 | 41.94 | 44.67 | 51.97 | 53.68 | 45.60 | 38.68 | 35.93 | 29.68 | 39.32 | |||||||||||||
1972 | 27.42 | 31.62 | 35.61 | 34.80 | 44.61 | 47.70 | 51.47 | a | 51.74 | 44.23 | 37.19 | 36.77 | 28.19 | 39.28 | ||||||||||||
1973 | 29.90 | 33.96 | 33.97 | 36.77 | 43.13 | 47.83 | 50.81 | 46.94 | 47.80 | 41.42 | 33.20 | 35.61 | 40.11 | |||||||||||||
1974 | 28.29 | 32.82 | 33.71 | 37.77 | 40.10 | 47.90 | 50.65 | 52.68 | 49.93 | 40.65 | 37.63 | 34.61 | 40.56 | |||||||||||||
1975 | 30.65 | 30.25 | 31.65 | 31.07 | 42.03 | 46.60 | 52.52 | 50.03 | a | 48.03 | 41.39 | 34.93 | 33.35 | 39.37 | ||||||||||||
1976 | 33.03 | 31.48 | 30.90 | 37.17 | 41.84 | 44.63 | 50.47 | a | 50.90 | 49.67 | 40.39 | 37.03 | 34.10 | 40.13 | ||||||||||||
1977 | 27.87 | 36.11 | 32.77 | 39.23 | 40.55 | 47.70 | 49.65 | 54.42 | 45.67 | 39.32 | 33.17 | 33.32 | 39.98 | |||||||||||||
1978 | 35.29 | 35.54 | 37.42 | 37.40 | 42.06 | 50.37 | 51.94 | 51.60 | a | 47.57 | 41.71 | 30.73 | 27.32 | 40.75 | ||||||||||||
1979 | 26.39 | 30.89 | 35.84 | 37.50 | 43.71 | 46.67 | 51.26 | 51.71 | 48.53 | 42.35 | 33.73 | 36.65 | 40.44 | |||||||||||||
1980 | 24.58 | 32.83 | 33.94 | 37.97 | 41.55 | 45.53 | 49.32 | 47.83 | b | 46.20 | 40.84 | 36.77 | 34.94 | 39.36 | ||||||||||||
1981 | 38.61 | 33.04 | 36.32 | 37.83 | 42.13 | 45.38 | a | 50.61 | 52.97 | 47.03 | 38.32 | 36.78 | c | 30.77 | 40.82 | |||||||||||
1982 | 29.50 | a | 31.07 | 31.97 | 33.28 | a | 41.06 | 49.57 | 50.03 | 51.58 | 48.10 | 41.25 | c | 32.60 | ----- | z | 40.00 | a | ||||||||
1983 | 35.86 | c | 35.92 | b | 37.23 | 37.90 | 45.38 | b | 47.30 | 50.52 | 52.10 | 44.77 | 39.38 | b | 36.55 | a | 25.61 | 40.71 | ||||||||
1984 | 33.32 | 33.29 | a | 35.61 | 35.07 | 39.16 | 43.97 | 48.10 | 48.74 | 43.07 | 34.87 | 31.63 | c | 28.65 | 37.96 | |||||||||||
1985 | 29.39 | 28.25 | 30.90 | 38.03 | a | 41.97 | 46.50 | 52.13 | 49.68 | 43.60 | 38.52 | 25.28 | a | 28.00 | 37.69 | |||||||||||
1986 | 36.03 | a | 30.30 | a | 35.87 | a | 35.37 | 41.94 | 48.93 | 47.77 | 52.13 | 43.77 | 40.39 | 34.27 | 32.70 | a | 39.95 | |||||||||
1987 | 31.29 | 35.75 | 36.21 | c | 38.57 | 43.37 | a | 47.43 | 50.29 | 50.19 | 46.79 | b | 40.87 | 38.40 | 29.62 | b | 40.73 | |||||||||
1988 | 31.27 | a | 33.21 | 34.26 | 38.93 | 42.26 | 45.87 | 50.39 | 49.55 | 46.90 | a | 44.23 | a | 36.14 | a | 32.90 | 40.49 | |||||||||
1989 | 30.97 | 25.00 | 32.40 | a | 39.87 | 42.81 | 49.53 | 50.81 | 51.00 | 47.80 | 40.23 | a | 36.40 | 33.19 | 40.00 | |||||||||||
1990 | 32.43 | a | 28.67 | a | 36.00 | 40.67 | 42.52 | 47.33 | 53.23 | 53.06 | 49.20 | 39.13 | a | 36.21 | a | 24.47 | a | 40.24 | ||||||||
1991 | 30.33 | a | 36.96 | 32.48 | 36.70 | 41.87 | 44.40 | 50.81 | 52.16 | 47.00 | 38.77 | a | 37.17 | a | 34.86 | b | 40.29 | |||||||||
1992 | 36.44 | d | 39.86 | a | 38.53 | a | 40.00 | 43.32 | 48.70 | 52.16 | 50.39 | 45.34 | a | 42.67 | a | 36.27 | d | 30.72 | b | 42.03 | ||||||
1993 | 28.03 | b | 31.40 | c | 37.23 | a | 39.04 | b | 47.23 | a | 47.69 | a | 49.81 | 51.19 | 46.47 | 43.74 | 30.39 | b | 33.11 | c | 40.44 | |||||
1994 | 36.11 | c | 30.20 | c | 36.10 | b | 40.24 | a | 44.06 | 46.03 | a | 51.65 | 51.00 | 48.76 | a | 40.90 | b | 32.57 | i | 31.88 | f | 42.51 | b | |||
1995 | 36.26 | 31.54 | d | 36.23 | e | 37.37 | 43.81 | 47.48 | a | 52.27 | a | 47.73 | a | 49.41 | a | 39.61 | 39.30 | c | 34.70 | d | 41.31 | |||||
1996 | 31.59 | d | 32.80 | d | 35.17 | a | 39.72 | a | 40.63 | a | 45.46 | b | 52.06 | 50.13 | 45.00 | c | 41.69 | b | 34.19 | c | 31.73 | a | 40.02 | |||
1997 | 32.76 | b | 33.63 | a | 34.93 | a | 36.72 | a | 45.55 | b | 46.93 | b | 50.81 | 53.24 | b | 49.50 | 40.74 | d | 39.45 | a | 34.54 | e | 41.57 | |||
1998 | 32.90 | b | 35.22 | a | 36.23 | a | 37.37 | 44.40 | a | 48.46 | d | 55.00 | 52.23 | a | 48.41 | a | 41.23 | 36.71 | f | 28.57 | c | 41.82 | a | |||
1999 | 31.35 | 32.31 | b | 32.47 | a | 33.45 | a | 37.17 | a | 44.93 | 47.58 | 50.17 | b | 43.03 | a | 38.07 | a | 35.71 | b | 31.23 | e | 38.12 | ||||
2000 | 27.97 | b | 30.89 | a | 30.23 | ----- | z | 39.17 | a | 45.10 | a | 47.68 | 46.50 | a | 44.21 | a | 37.53 | a | 29.28 | a | 29.16 | 37.06 | a | |||
2001 | 30.33 | a | 27.04 | b | 31.61 | 32.07 | b | 38.50 | a | 42.14 | b | 45.61 | c | 48.07 | a | 43.18 | b | 37.40 | a | 34.88 | e | 27.43 | a | 36.52 | ||
2002 | 26.81 | 25.64 | 25.86 | b | 30.83 | 36.10 | 42.28 | a | 47.60 | a | 48.58 | 44.27 | 36.28 | b | 36.52 | c | 33.13 | 36.16 | ||||||||
2003 | 36.47 | a | 31.00 | 36.00 | 36.17 | 41.37 | a | 47.93 | a | 50.58 | 50.10 | 48.12 | f | 43.26 | d | 27.52 | e | 29.73 | a | 39.10 | a | |||||
2004 | 30.64 | f | 31.17 | 32.52 | 35.50 | b | 42.27 | a | 46.17 | 49.73 | a | 50.84 | 43.38 | a | 39.13 | 30.10 | 30.19 | 39.18 | a | |||||||
2005 | 30.16 | 27.18 | 33.71 | 34.17 | 42.10 | 43.60 | 47.39 | 48.00 | 40.70 | 40.23 | 32.93 | 31.90 | 37.67 | |||||||||||||
2006 | 34.61 | 31.21 | 35.29 | 38.63 | 44.81 | 51.93 | 54.68 | 51.26 | 49.63 | 41.29 | 37.24 | a | 35.23 | 42.15 | ||||||||||||
2007 | 30.42 | 34.50 | 35.19 | 36.47 | 39.87 | 48.20 | 55.73 | a | 52.61 | 47.62 | a | 41.42 | 35.93 | 33.58 | 40.96 | |||||||||||
2008 | 30.52 | 33.69 | 32.19 | 32.73 | 41.23 | 42.53 | 47.55 | 47.87 | 42.37 | 34.37 | a | 36.67 | 21.10 | 36.90 | ||||||||||||
2009 | 25.06 | 29.64 | 32.29 | 36.47 | 43.29 | 50.81 | d | 53.38 | g | 54.13 | 55.77 | 47.42 | 43.70 | 27.81 | 40.58 | a | ||||||||||
2010 | 34.16 | 36.54 | 36.00 | 37.17 | 40.77 | 46.27 | 50.10 | 51.39 | 49.13 | 41.68 | 33.53 | 33.77 | 40.88 | |||||||||||||
2011 | 32.13 | 27.89 | 33.06 | 33.27 | 39.03 | 46.37 | 48.74 | 53.29 | 51.33 | 44.10 | 32.83 | 30.23 | 39.36 | |||||||||||||
2012 | 31.94 | 35.48 | 33.23 | 39.03 | 41.77 | 46.27 | 50.42 | 49.65 | 44.87 | 42.06 | 38.83 | 34.90 | 40.70 | |||||||||||||
2013 | 28.90 | 33.21 | 34.97 | 38.10 | 44.68 | 50.80 | 52.03 | 55.55 | 52.80 | 38.68 | 36.13 | 28.13 | 41.17 | |||||||||||||
2014 | 33.84 | 29.68 | 36.03 | 39.47 | 46.90 | 48.27 | 54.68 | 55.16 | 51.73 | 47.32 | 36.17 | 35.10 | 42.86 | |||||||||||||
2015 | 35.81 | 38.36 | 38.58 | 38.23 | 46.84 | 53.80 | 56.81 | 52.19 | 46.03 | 46.03 | 32.70 | 33.52 | 43.24 | |||||||||||||
2016 | 34.52 | 37.72 | 37.68 | 43.87 | 47.61 | 50.10 | 54.71 | 53.39 | 46.67 | 43.90 | 42.00 | 28.13 | 43.36 | |||||||||||||
2017 | 27.65 | 32.54 | 35.74 | 39.37 | 44.19 | 48.97 | 50.55 | 55.19 | 50.73 | 39.64 | c | 37.07 | 32.26 | 41.16 | ||||||||||||
2018 | 36.58 | 30.71 | 34.03 | 38.77 | 47.16 | 48.43 | 52.94 | 53.97 | 47.03 | 40.06 | 38.67 | 33.52 | 41.82 | |||||||||||||
2019 | 35.65 | 26.96 | 33.52 | 40.10 | 46.13 | 47.57 | 53.42 | 54.74 | 50.50 | 39.03 | 34.87 | 34.42 | 41.41 | |||||||||||||
2020 | 33.77 | 33.46 | c | 32.87 | 37.93 | 47.26 | 48.17 | 53.10 | 51.58 | 52.60 | 43.13 | 37.17 | a | 34.10 | 42.10 | |||||||||||
2021 | 34.68 | 31.96 | 33.26 | 37.83 | 43.23 | 53.37 | 53.58 | 54.45 | 47.87 | 41.32 | 37.60 | 30.70 | a | 41.65 | ||||||||||||
2022 | 32.55 | 31.43 | 37.00 | 35.43 | 42.35 | 50.57 | 55.00 | e | 55.70 | d | 49.50 | d | 45.26 | 31.93 | 30.13 | 41.40 | ||||||||||
2023 | 32.67 | a | 30.43 | 31.26 | 36.87 | 46.42 | 47.17 | 50.52 | 54.94 | 49.07 | 44.00 | 36.13 | 38.42 | 41.49 | ||||||||||||
2024 | 33.45 | 34.93 | 36.11 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.83 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.24 | 32.38 | 33.97 | 37.17 | 42.66 | 47.26 | 50.96 | 51.14 | 47.38 | 41.31 | 35.58 | 32.08 | 40.30 | |||||||||||||
S.D. | 3.99 | 3.06 | 2.32 | 2.27 | 2.41 | 2.33 | 2.13 | 2.09 | 2.56 | 2.58 | 3.10 | 3.13 | 1.42 | |||||||||||||
SKEW | -1.08 | 0.13 | -0.40 | -0.49 | 0.02 | 0.44 | 0.31 | 0.15 | 0.19 | -0.12 | -0.37 | -0.68 | -0.57 | |||||||||||||
MAX | 38.61 | 39.86 | 38.58 | 43.87 | 47.61 | 53.80 | 56.81 | 55.70 | 55.77 | 47.42 | 43.70 | 38.42 | 43.36 | |||||||||||||
MIN | 15.10 | 25.00 | 25.86 | 30.83 | 36.10 | 42.14 | 45.61 | 46.50 | 40.70 | 34.37 | 25.28 | 21.10 | 36.16 | |||||||||||||
YRS | 83 | 86 | 86 | 84 | 85 | 85 | 84 | 84 | 84 | 85 | 83 | 83 | 75 |