YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.69 | q | 48.42 | 44.23 | a | 42.69 | a | 35.06 | 31.97 | a | 26.10 | 38.08 | f | |||
1952 | 24.13 | a | 30.03 | 27.13 | 37.13 | 38.71 | 39.43 | 51.16 | 48.52 | 47.03 | 39.40 | a | 28.90 | 29.84 | 36.79 | |||||||||||
1953 | 33.00 | 25.75 | 29.42 | 33.73 | 34.83 | a | 40.37 | 50.90 | 45.61 | c | 44.17 | 33.69 | b | 34.20 | 26.29 | 36.00 | ||||||||||
1954 | 25.48 | 29.96 | 29.13 | a | 37.90 | 39.16 | 40.40 | 46.97 | 40.23 | 38.93 | a | 34.58 | 31.77 | 22.17 | m | 35.86 | a | |||||||||
1955 | 23.93 | a | 26.11 | a | 29.03 | 31.93 | b | 38.00 | w | ----- | z | 48.17 | s | 50.87 | 43.45 | a | 37.29 | 29.20 | 35.93 | d | 34.19 | c | ||||
1956 | 32.44 | f | 25.10 | 29.80 | a | 35.72 | a | 40.97 | 42.90 | a | 48.43 | a | 43.61 | 42.77 | 35.19 | 26.59 | c | 23.06 | 35.83 | a | ||||||
1957 | 21.81 | 33.04 | 31.74 | 35.00 | a | 39.90 | 44.28 | a | 47.45 | 44.75 | c | 41.97 | a | 37.16 | 29.80 | 28.81 | 36.31 | |||||||||
1958 | 27.35 | 34.70 | a | 29.84 | 34.35 | d | 40.71 | 43.35 | g | 47.21 | b | 53.26 | d | 45.28 | a | 39.89 | d | 29.07 | 26.93 | d | 37.14 | a | ||||
1959 | 26.70 | a | 26.86 | 30.07 | a | 34.93 | a | 34.16 | 43.70 | 51.61 | 47.35 | 42.90 | 36.65 | 30.20 | 28.81 | 36.16 | ||||||||||
1960 | 28.13 | 30.93 | 36.06 | 35.63 | 37.71 | 47.17 | 53.13 | 47.13 | 44.21 | b | 36.30 | a | 33.53 | 26.58 | 38.04 | |||||||||||
1961 | 26.87 | 30.39 | 31.13 | 33.87 | 36.52 | 47.41 | a | ----- | z | 52.10 | 41.43 | 35.90 | a | 26.80 | e | 27.65 | 35.46 | a | ||||||||
1962 | 26.32 | 32.54 | 30.97 | 37.23 | 35.58 | 41.63 | 46.36 | i | 47.97 | a | 44.20 | 37.65 | 32.57 | 27.03 | 35.79 | a | ||||||||||
1963 | 23.03 | 38.57 | 31.06 | 35.21 | a | 43.71 | 44.60 | 47.03 | 48.03 | 48.89 | b | 42.28 | b | 32.00 | b | 25.00 | d | 38.28 | ||||||||
1964 | 24.61 | 23.62 | c | 27.48 | 33.36 | b | 37.03 | 43.23 | 50.13 | a | 50.21 | b | 40.77 | 40.13 | a | 29.63 | 30.19 | 35.87 | ||||||||
1965 | 29.10 | 26.64 | 31.94 | 36.50 | 36.65 | 43.10 | 50.19 | 52.26 | 42.43 | 38.76 | b | 36.30 | 28.42 | 37.69 | ||||||||||||
1966 | 24.73 | a | 28.78 | a | 33.07 | a | 36.40 | 41.42 | 44.57 | 47.32 | 51.00 | 45.47 | 37.10 | 35.03 | 29.61 | 37.87 | ||||||||||
1967 | 27.74 | 28.39 | 32.35 | 30.03 | ----- | z | 42.07 | 52.71 | 53.53 | a | 49.62 | a | 37.29 | 36.90 | a | 23.19 | 37.62 | a | ||||||||
1968 | 26.13 | 34.52 | 32.58 | 31.97 | 36.60 | a | 44.40 | 50.84 | 46.17 | a | ----- | z | 36.28 | b | 31.93 | 26.10 | 36.14 | a | ||||||||
1969 | 30.19 | 30.18 | 31.10 | 35.57 | 41.29 | 47.60 | 53.58 | 51.28 | b | 46.37 | c | 34.20 | a | 32.73 | 26.77 | 38.41 | ||||||||||
1970 | 32.65 | 33.39 | 32.00 | 29.47 | 37.90 | 46.27 | 53.14 | c | 51.00 | a | 40.97 | 35.23 | 33.13 | 28.71 | 37.82 | |||||||||||
1971 | 26.94 | 26.86 | 30.10 | 30.80 | 38.87 | 43.12 | e | 49.29 | 50.97 | 43.80 | 32.55 | 27.63 | 27.06 | 35.67 | ||||||||||||
1972 | 24.13 | 28.90 | 33.35 | 31.80 | 38.61 | 46.37 | 54.32 | 46.77 | 41.40 | 37.90 | a | 31.47 | 24.06 | 36.59 | ||||||||||||
1973 | 27.39 | 34.46 | 29.77 | 34.63 | 41.32 | 43.90 | 47.74 | 49.32 | 41.79 | a | 35.94 | 31.30 | 31.50 | a | 37.42 | |||||||||||
1974 | 29.77 | 27.11 | 33.90 | 33.07 | 37.77 | 45.93 | 50.48 | 49.13 | 47.10 | 41.19 | 33.03 | 25.32 | 37.82 | |||||||||||||
1975 | 25.94 | 29.39 | 31.65 | 31.10 | 38.35 | 44.50 | 49.58 | 47.00 | 48.57 | 37.29 | 29.87 | 27.42 | 36.72 | |||||||||||||
1976 | 24.71 | 31.07 | 29.03 | 32.13 | 40.43 | a | 43.40 | 52.87 | 46.32 | 48.67 | 40.65 | 33.20 | 25.06 | 37.30 | ||||||||||||
1977 | 27.47 | a | 29.04 | 26.68 | 33.77 | 37.42 | 50.10 | 50.32 | 53.90 | 47.03 | 39.68 | 31.57 | 33.32 | 38.36 | ||||||||||||
1978 | 35.06 | 34.82 | 41.45 | 37.03 | 38.97 | 44.83 | 50.03 | 49.77 | 45.30 | 39.87 | 28.00 | a | 23.52 | 39.06 | ||||||||||||
1979 | 27.97 | 29.00 | 34.60 | a | 34.20 | 40.77 | 42.67 | 48.33 | a | 47.23 | 46.33 | 40.94 | 30.23 | 29.39 | 37.64 | |||||||||||
1980 | 33.32 | 33.79 | 30.71 | 35.60 | 37.52 | 40.30 | 51.23 | 47.71 | 44.07 | 38.94 | 30.30 | 29.71 | 37.77 | |||||||||||||
1981 | 32.42 | 32.61 | 34.26 | 37.67 | 40.17 | a | 44.40 | 45.23 | 48.74 | 47.50 | 36.68 | 33.83 | 31.03 | 38.71 | ||||||||||||
1982 | 26.06 | 32.75 | 34.13 | 36.03 | 40.29 | 43.54 | d | 52.85 | k | 51.03 | 47.17 | 38.59 | b | 31.10 | 29.06 | 37.25 | a | |||||||||
1983 | 30.58 | 34.89 | a | 36.55 | 35.87 | 42.27 | a | 45.52 | a | 44.97 | 52.31 | b | 50.70 | 42.16 | 36.17 | a | 34.84 | 40.57 | ||||||||
1984 | 30.65 | 29.62 | 33.61 | 33.27 | 42.87 | 45.37 | 56.16 | 53.90 | 50.97 | 37.47 | a | 32.27 | 29.32 | 39.62 | ||||||||||||
1985 | 28.13 | 28.68 | 30.71 | 36.27 | 38.10 | 48.13 | 52.29 | 45.77 | 45.57 | 38.06 | 31.43 | 29.87 | 37.75 | |||||||||||||
1986 | 34.79 | b | 35.86 | 37.26 | 36.80 | 40.00 | a | 47.43 | 50.42 | 52.48 | 41.60 | 36.65 | 30.07 | 28.23 | a | 39.30 | ||||||||||
1987 | 25.84 | 30.63 | a | 34.00 | a | 38.40 | 43.13 | 48.33 | 47.77 | 49.87 | 45.90 | 44.23 | 35.23 | 27.61 | 39.25 | |||||||||||
1988 | 30.58 | 28.66 | 31.42 | 37.07 | 38.90 | 46.00 | 54.30 | a | 53.55 | 46.97 | 40.97 | 32.80 | 28.58 | 39.15 | ||||||||||||
1989 | 26.26 | 28.54 | 35.45 | 40.40 | 40.68 | 46.43 | 50.45 | 48.13 | a | 45.00 | 38.42 | 29.79 | a | 24.00 | 37.80 | |||||||||||
1990 | 27.29 | 27.52 | a | 34.63 | a | 38.73 | 38.74 | 45.77 | 53.97 | 50.65 | 46.07 | 38.84 | 30.37 | 22.69 | b | 37.94 | ||||||||||
1991 | 27.39 | 30.68 | 31.94 | 34.97 | 37.94 | 43.70 | 54.16 | 51.53 | a | 50.67 | 43.13 | 35.70 | ----- | z | 40.16 | a | ||||||||||
1992 | ----- | z | 33.00 | m | 37.06 | 37.57 | 45.42 | 47.77 | 52.61 | 52.29 | 46.52 | a | 42.00 | ----- | z | 26.35 | 43.07 | c | ||||||||
1993 | 30.81 | 34.46 | ----- | z | 36.23 | ----- | z | ----- | z | 49.52 | ----- | z | 43.83 | 40.00 | 31.17 | 27.97 | 36.75 | d | ||||||||
1994 | 26.87 | 31.61 | 34.42 | 37.33 | 41.27 | a | 44.67 | 52.30 | a | 50.35 | 45.10 | 36.45 | 27.57 | 29.71 | 38.14 | |||||||||||
1995 | 36.03 | 33.89 | 35.65 | ----- | z | 41.84 | 44.24 | a | 50.10 | 49.81 | 45.67 | 38.13 | 34.17 | 32.75 | g | 40.95 | b | |||||||||
1996 | 30.58 | 35.48 | 34.16 | 36.90 | 40.16 | 46.40 | 53.52 | 52.10 | 44.03 | 36.30 | a | 35.90 | a | 33.03 | 39.88 | |||||||||||
1997 | 33.84 | 30.64 | 32.84 | 33.66 | a | 44.03 | 46.47 | 50.84 | 52.00 | 49.93 | 37.48 | 35.87 | 28.39 | 39.67 | ||||||||||||
1998 | 33.94 | 34.68 | 35.84 | 35.69 | a | 39.73 | a | 46.43 | 52.81 | 52.45 | 49.13 | 35.87 | 32.27 | 25.26 | 39.51 | |||||||||||
1999 | 27.35 | 29.93 | a | 30.53 | a | 33.37 | 38.87 | a | 43.93 | a | 50.27 | a | 49.32 | 47.40 | 37.52 | 35.17 | a | 25.26 | 37.41 | |||||||
2000 | 29.94 | 36.36 | a | 33.74 | 36.86 | a | 43.10 | 49.00 | 49.00 | 51.10 | 45.88 | v | 40.93 | a | 28.00 | 28.37 | a | 38.76 | a | |||||||
2001 | 27.87 | 29.11 | 37.63 | a | 34.57 | 45.16 | 46.73 | 53.35 | 51.87 | 48.07 | 42.87 | 36.40 | 31.26 | 40.41 | ||||||||||||
2002 | 28.50 | s | 29.79 | 31.39 | 37.17 | 38.43 | a | 46.29 | p | 53.10 | 48.23 | 46.87 | 36.52 | 34.90 | 29.87 | 38.62 | b | |||||||||
2003 | 31.77 | 32.36 | 33.87 | 35.03 | 42.74 | 47.17 | 54.84 | 53.03 | 48.40 | 40.90 | 30.83 | 30.14 | b | 40.09 | ||||||||||||
2004 | 28.55 | 30.17 | 35.71 | 35.27 | 38.35 | 47.07 | 52.10 | a | 51.00 | a | 43.70 | 39.84 | 29.37 | 27.32 | 38.20 | |||||||||||
2005 | 32.74 | 33.57 | 35.42 | 34.97 | 42.94 | 43.10 | 54.61 | 51.32 | 41.17 | 37.19 | 33.87 | 30.79 | b | 39.31 | ||||||||||||
2006 | 30.23 | 28.00 | 30.26 | 39.13 | 44.43 | c | 49.77 | d | 56.37 | a | 48.08 | e | 44.92 | d | 36.64 | c | 32.34 | a | 27.18 | c | 38.95 | |||||
2007 | 21.57 | a | 30.82 | 33.54 | c | 36.10 | a | 40.07 | c | 45.20 | 52.61 | 51.37 | a | 46.34 | a | 38.39 | 33.14 | a | 25.03 | b | 37.85 | |||||
2008 | 29.26 | 29.43 | a | 30.79 | b | 31.67 | 40.26 | 45.37 | 54.93 | a | 52.74 | 46.50 | 37.93 | a | 37.37 | 27.90 | 38.68 | |||||||||
2009 | 30.16 | 30.54 | 30.00 | b | 34.37 | 44.19 | d | 45.89 | b | 53.74 | 50.19 | 48.24 | a | 35.54 | c | 30.35 | d | 27.10 | 38.36 | |||||||
2010 | 29.62 | b | 31.56 | c | 31.89 | c | 32.75 | b | 36.42 | e | 44.13 | g | 52.60 | f | 48.17 | b | 43.82 | b | 43.46 | e | 30.58 | d | 31.42 | e | 35.97 | b |
2011 | 27.72 | f | 26.71 | 32.39 | 34.96 | e | 36.83 | b | 44.96 | d | 52.12 | g | 50.11 | c | 46.43 | b | 39.90 | 32.36 | b | 19.87 | 36.45 | b | ||||
2012 | 25.93 | a | 30.52 | 29.00 | 36.20 | 39.16 | 44.67 | c | 51.27 | a | 54.84 | 49.00 | 40.06 | 33.83 | 31.06 | 38.80 | ||||||||||
2013 | 25.68 | 24.57 | 31.82 | c | 35.40 | 39.97 | a | 48.23 | 55.97 | 50.47 | a | 47.63 | 35.55 | 32.21 | b | 23.58 | 37.59 | |||||||||
2014 | 26.40 | a | 33.32 | 33.97 | a | 36.34 | a | 40.25 | c | 45.10 | a | 55.45 | 51.97 | a | 49.03 | 40.90 | 34.11 | b | 30.61 | 39.79 | ||||||
2015 | 30.26 | 33.39 | 34.79 | b | 32.87 | 41.17 | a | 50.20 | 54.97 | 53.00 | c | 49.53 | 45.03 | 29.87 | 27.58 | 40.22 | ||||||||||
2016 | 32.52 | b | 30.90 | 34.50 | a | 37.90 | a | 41.07 | a | 47.34 | a | 49.52 | 49.10 | 41.76 | a | 38.03 | a | 33.60 | 30.86 | b | 38.92 | |||||
2017 | 31.84 | 35.39 | 34.34 | b | 37.76 | a | 41.28 | f | 51.18 | m | 54.39 | h | 53.62 | g | 44.89 | k | 35.26 | h | 33.73 | d | 23.04 | g | 34.61 | g | ||
2018 | 31.67 | a | 24.04 | c | 35.55 | k | 36.82 | h | 39.40 | k | 44.60 | o | 57.69 | r | 51.78 | h | 44.71 | f | 38.56 | o | 31.95 | i | 31.33 | m | 27.85 | j |
2019 | 34.21 | q | 27.17 | e | 33.50 | i | 37.88 | f | 40.21 | c | 48.39 | g | 51.13 | h | 50.56 | f | 44.00 | c | 31.96 | c | 30.04 | d | 31.27 | a | 34.11 | f |
2020 | 28.21 | b | 26.73 | c | 29.75 | k | 37.23 | h | 40.72 | m | 47.33 | i | 52.04 | c | ----- | z | ----- | z | ----- | z | 28.53 | o | 26.52 | 33.37 | h | |
2021 | ----- | z | 35.00 | y | 29.29 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.33 | y | ----- | z | 27.57 | x | ----- | z |
2022 | ----- | z | 19.14 | u | 28.00 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2023 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.50 | q | 29.09 | s | 29.53 | n | ----- | z |
2024 | 31.27 | i | 30.00 | q | 31.88 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 28.57 | 30.58 | 32.56 | 35.16 | 39.87 | 45.21 | 51.31 | 49.85 | 45.58 | 38.29 | 32.04 | 28.01 | 38.24 | |||||||||||||
S.D. | 3.31 | 3.27 | 2.77 | 2.27 | 2.50 | 2.39 | 2.76 | 2.84 | 2.83 | 2.74 | 2.59 | 2.99 | 1.24 | |||||||||||||
SKEW | 0.17 | 0.04 | 0.36 | -0.36 | 0.13 | -0.16 | -0.22 | -0.82 | -0.11 | 0.23 | 0.02 | 0.02 | -0.15 | |||||||||||||
MAX | 36.03 | 38.57 | 41.45 | 40.40 | 45.42 | 50.20 | 56.37 | 54.84 | 50.97 | 45.03 | 37.37 | 35.93 | 40.57 | |||||||||||||
MIN | 21.57 | 23.62 | 26.68 | 29.47 | 34.16 | 39.43 | 44.97 | 40.23 | 38.93 | 31.96 | 26.59 | 19.87 | 35.67 | |||||||||||||
YRS | 64 | 68 | 65 | 65 | 63 | 60 | 61 | 65 | 65 | 67 | 67 | 65 | 48 |