YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | ----- | z | 59.12 | w | 66.90 | a | 72.74 | 69.50 | 62.11 | b | 52.56 | 40.20 | 38.89 | 57.56 | e | |||||
1958 | 34.10 | 41.63 | a | 40.58 | 49.68 | 60.56 | 69.07 | 71.37 | 71.11 | 65.14 | b | 54.78 | a | 43.78 | a | 40.78 | h | 54.71 | a | |||||||
1959 | 36.69 | r | 38.46 | a | 42.17 | b | 53.16 | a | 57.63 | 68.45 | a | 71.86 | c | 69.75 | a | 61.86 | b | 55.37 | 43.37 | 38.27 | 54.58 | a | ||||
1960 | 31.74 | 34.54 | b | 46.95 | a | 51.88 | 57.02 | a | 67.57 | a | 70.48 | d | 71.15 | a | 65.67 | c | 53.73 | 44.75 | 34.72 | b | 52.52 | |||||
1961 | 36.50 | 39.52 | 44.05 | 50.75 | 56.93 | b | 67.95 | b | 70.77 | 69.24 | d | 62.47 | 52.69 | b | 42.96 | b | 36.63 | a | 52.54 | |||||||
1962 | 35.42 | 42.11 | 38.68 | 52.77 | 56.63 | 63.90 | 69.93 | a | 69.75 | c | 65.31 | a | 54.82 | 46.12 | b | 39.32 | 52.90 | |||||||||
1963 | 33.56 | 41.81 | a | 43.34 | c | 50.13 | 59.41 | b | 63.64 | a | 72.83 | b | 68.93 | a | 65.61 | b | 56.48 | 44.88 | a | 36.56 | 53.10 | |||||
1964 | 31.24 | 32.76 | 40.94 | 48.43 | 58.52 | 64.48 | c | 72.34 | c | 70.66 | f | 64.61 | b | 55.02 | e | 43.46 | b | 37.28 | b | 49.92 | a | |||||
1965 | 39.81 | 37.27 | b | 41.08 | 51.33 | 56.72 | a | 62.98 | c | 71.00 | e | 69.37 | e | 62.52 | f | 53.48 | a | 45.19 | d | 37.08 | a | 51.39 | a | |||
1966 | 32.00 | 33.93 | a | 44.71 | b | 52.38 | e | 59.71 | c | 66.64 | a | 73.21 | 70.20 | a | 63.70 | 53.57 | b | 46.03 | 35.90 | a | 52.66 | |||||
1967 | 35.18 | a | 40.67 | a | 47.75 | c | 51.08 | f | 56.43 | c | 65.33 | a | 73.07 | b | 68.69 | 64.45 | a | 55.02 | b | 46.41 | a | 34.34 | 53.39 | a | ||
1968 | 37.35 | a | 43.96 | a | 44.45 | c | 48.78 | 57.41 | i | 67.50 | g | 70.26 | d | 67.50 | a | 61.39 | c | 54.59 | c | 43.48 | e | 34.73 | a | 50.65 | b | |
1969 | 40.95 | b | 39.31 | a | 40.65 | a | 52.18 | 58.22 | b | 65.68 | 71.48 | g | 71.28 | h | 63.38 | a | 54.62 | f | 42.43 | a | 37.72 | h | 50.35 | d | ||
1970 | 34.82 | 41.28 | a | 42.60 | 47.20 | h | 58.78 | a | 66.35 | d | 72.98 | c | 70.43 | d | 63.96 | e | 50.47 | 44.08 | d | 37.04 | e | 52.98 | a | |||
1971 | 35.55 | c | 39.64 | c | 44.74 | b | 49.70 | 55.34 | 66.45 | b | 73.97 | b | 68.82 | c | 62.67 | c | 52.36 | c | 43.54 | f | 39.67 | p | 54.92 | b | ||
1972 | 37.22 | a | 40.26 | 50.03 | 51.75 | d | 57.69 | b | 66.10 | 71.88 | a | 68.71 | 63.33 | 56.65 | 39.67 | a | 37.33 | a | 53.39 | |||||||
1973 | 34.21 | 39.70 | 42.24 | 47.05 | b | 58.02 | 65.80 | 69.95 | a | 68.80 | a | 63.42 | 53.52 | a | 43.18 | 36.08 | 51.83 | |||||||||
1974 | 38.55 | a | 37.00 | a | 48.55 | 50.65 | 60.24 | 69.95 | b | 69.82 | 67.58 | 62.75 | 55.23 | a | 43.23 | 33.82 | a | 53.11 | ||||||||
1975 | 35.32 | 38.73 | 43.40 | 46.78 | 55.35 | a | 64.53 | a | 70.02 | 68.95 | c | 62.57 | 53.45 | b | 42.13 | 36.79 | 51.50 | |||||||||
1976 | 35.73 | 43.00 | 43.56 | 50.65 | 57.98 | a | 65.73 | b | 69.53 | a | 69.38 | a | 62.15 | 50.76 | 42.72 | a | 34.59 | b | 52.15 | |||||||
1977 | 35.30 | a | 40.91 | a | 40.88 | a | 51.00 | c | 56.35 | e | 67.07 | b | 72.28 | a | 70.93 | a | 65.67 | a | 55.88 | b | 44.75 | b | 39.84 | 53.41 | ||
1978 | 37.88 | b | 39.64 | 47.18 | 52.22 | a | 58.27 | a | 67.68 | e | 73.11 | 68.31 | b | 63.64 | b | 55.65 | a | 45.82 | 34.78 | a | 53.68 | |||||
1979 | 34.15 | a | 38.98 | 44.77 | a | 51.40 | a | 58.79 | b | 66.18 | b | 72.84 | b | 67.77 | 65.28 | ----- | z | 39.80 | 38.53 | a | 52.59 | a | ||||
1980 | 39.26 | 42.87 | c | 43.43 | c | 51.23 | 56.74 | 68.42 | 73.18 | 70.31 | 64.79 | b | 51.27 | a | 42.33 | 40.43 | a | 53.69 | ||||||||
1981 | 40.03 | 41.44 | a | 44.37 | 55.33 | 59.53 | a | 69.75 | 72.32 | 69.76 | 64.35 | d | 55.02 | 45.18 | b | 39.53 | a | 54.72 | ||||||||
1982 | 37.48 | 41.54 | 45.58 | 51.70 | 56.80 | a | 63.28 | 70.53 | 70.15 | a | 64.41 | a | 51.15 | 43.04 | b | 35.26 | 52.58 | |||||||||
1983 | 37.77 | 40.68 | 44.86 | b | 46.71 | a | 57.05 | 64.38 | a | 71.53 | a | 71.33 | a | 67.40 | 56.12 | a | 44.36 | a | 39.55 | a | 53.48 | |||||
1984 | 38.77 | 38.50 | 45.68 | a | 50.50 | 62.65 | 67.33 | 70.60 | 69.45 | 64.98 | 52.08 | 43.13 | 39.18 | 53.57 | ||||||||||||
1985 | 36.81 | 39.20 | 46.73 | a | 53.87 | 59.93 | a | 68.47 | 72.68 | 70.73 | 62.33 | 53.84 | 44.78 | 37.75 | a | 53.93 | ||||||||||
1986 | 40.56 | 42.38 | 47.58 | 53.37 | 58.58 | a | 68.35 | 69.81 | 70.92 | a | 61.66 | a | 52.06 | 44.15 | 36.14 | b | 53.80 | |||||||||
1987 | 35.15 | a | 39.19 | a | 42.55 | 52.75 | 57.35 | 67.68 | 69.90 | 68.74 | 62.02 | 56.37 | 42.14 | a | 34.60 | 52.37 | ||||||||||
1988 | 35.29 | 42.26 | 43.60 | 51.22 | a | 58.89 | 67.50 | a | 71.06 | 69.87 | 61.02 | a | 57.39 | 44.40 | 37.34 | 53.32 | ||||||||||
1989 | 36.68 | 43.98 | 49.11 | 56.12 | 61.40 | 67.02 | 72.35 | 69.00 | 63.37 | 53.40 | a | 44.30 | 35.82 | 54.38 | ||||||||||||
1990 | 36.02 | 38.86 | 46.92 | 54.85 | 59.10 | 70.97 | 71.23 | 67.34 | 65.72 | 53.79 | 44.32 | 34.77 | a | 53.66 | ||||||||||||
1991 | 36.84 | 41.28 | a | 42.05 | 49.31 | a | 56.73 | 63.42 | 69.68 | 69.13 | 63.00 | 53.37 | 42.92 | 38.02 | 52.14 | |||||||||||
1992 | 34.40 | 40.45 | 45.00 | 53.37 | 58.44 | 63.40 | 68.90 | 68.35 | 63.07 | 54.18 | 38.00 | 36.50 | a | 52.00 | ||||||||||||
1993 | 41.00 | 39.80 | c | 45.39 | 50.95 | a | 58.84 | 65.39 | b | 70.19 | 69.16 | 62.03 | 52.28 | a | 41.43 | 35.82 | 52.69 | |||||||||
1994 | 36.33 | a | 38.39 | a | 46.57 | a | 51.13 | 58.28 | a | 69.34 | a | 70.92 | 71.98 | a | 65.15 | 52.77 | a | 44.05 | a | 39.81 | 53.73 | |||||
1995 | 36.71 | 44.98 | a | 46.57 | b | 48.47 | 56.03 | a | 63.45 | 68.52 | 69.24 | 63.14 | a | 53.37 | 46.85 | 38.23 | 52.96 | |||||||||
1996 | 37.18 | 45.09 | 44.21 | 51.68 | 60.67 | a | 68.07 | 71.29 | 68.91 | b | 61.26 | a | 53.13 | 43.75 | 37.29 | 53.54 | ||||||||||
1997 | 36.73 | a | 39.10 | c | 46.08 | 49.30 | e | 59.92 | a | 63.47 | a | 69.08 | 69.43 | a | 66.82 | 53.10 | a | 43.77 | 34.17 | a | 52.58 | |||||
1998 | 37.76 | 37.87 | a | 43.56 | 45.77 | d | 56.72 | b | 63.81 | a | 70.83 | a | 69.08 | 65.18 | 54.43 | a | 45.28 | 38.85 | a | 52.43 | ||||||
1999 | 38.36 | b | 40.89 | 45.58 | 48.71 | d | 57.11 | 64.36 | a | 70.05 | a | 68.23 | 64.00 | 53.31 | b | 45.60 | 33.50 | 52.48 | ||||||||
2000 | 38.44 | 42.24 | 44.98 | 52.85 | d | 61.85 | 67.80 | 71.03 | 68.79 | 64.42 | 53.84 | 38.41 | a | 37.61 | 53.52 | |||||||||||
2001 | 34.63 | a | 39.57 | a | 44.28 | a | 51.67 | a | 60.03 | b | 66.43 | a | 70.52 | 68.11 | 62.88 | 54.77 | 45.62 | 33.85 | 52.70 | |||||||
2002 | 36.19 | 38.56 | a | 43.20 | a | 54.68 | 57.38 | a | 68.17 | a | 70.44 | 68.23 | a | 63.10 | a | 51.94 | 43.77 | b | 35.93 | a | 52.63 | |||||
2003 | 40.97 | 39.46 | b | 43.42 | 49.38 | a | 60.00 | 64.47 | 72.39 | 70.10 | 64.18 | 56.98 | 43.66 | a | 35.45 | 53.37 | ||||||||||
2004 | 36.42 | a | 34.80 | b | 48.74 | b | 49.72 | 57.77 | 63.78 | 69.02 | 66.34 | 60.20 | 52.40 | 42.05 | 36.55 | 51.48 | ||||||||||
2005 | 39.76 | 41.78 | a | 43.72 | b | 49.80 | b | 59.16 | b | 64.40 | 70.55 | a | 68.92 | 64.57 | 54.73 | a | 43.95 | 37.61 | 53.25 | |||||||
2006 | 37.18 | a | 40.82 | 44.00 | b | 53.00 | a | 60.21 | b | 67.75 | 70.98 | c | 68.21 | 60.18 | 52.50 | 43.93 | 35.56 | 52.86 | ||||||||
2007 | 35.17 | b | 39.39 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.28 | j |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | 51.12 | b | 56.58 | 67.38 | a | 71.33 | m | 71.34 | 67.19 | i | 54.47 | a | 40.56 | c | 39.65 | 54.44 | e | |||
2011 | 33.52 | 36.41 | a | 47.03 | a | 53.95 | 55.62 | b | 67.50 | 73.48 | a | 73.63 | 65.33 | 54.47 | a | 43.13 | 34.03 | 53.18 | ||||||||
2012 | 39.40 | 39.70 | a | 44.45 | 53.85 | 59.70 | a | 69.25 | 71.76 | 72.00 | 64.32 | 54.42 | 44.83 | 36.44 | 54.18 | |||||||||||
2013 | 32.21 | 35.48 | 46.85 | 53.18 | 58.34 | 69.85 | 72.18 | 70.58 | 65.15 | 51.23 | 44.38 | 37.16 | 53.05 | |||||||||||||
2014 | 37.97 | 43.21 | 46.03 | a | 51.85 | 58.58 | 68.55 | 72.39 | 69.42 | 67.57 | 56.44 | 42.83 | a | 38.57 | a | 54.45 | ||||||||||
2015 | 38.73 | a | 44.82 | 48.29 | 50.92 | 56.45 | 69.85 | 71.26 | 71.63 | 66.25 | 57.02 | 43.40 | 35.52 | 54.51 | ||||||||||||
2016 | 35.40 | e | 42.03 | 47.27 | 51.80 | 56.82 | 69.75 | 72.65 | 68.19 | 64.33 | 56.84 | 45.72 | 40.35 | 54.26 | ||||||||||||
2017 | 38.00 | a | 42.54 | a | 49.85 | 52.48 | 57.34 | 68.93 | 72.02 | 69.23 | 63.48 | 56.08 | 50.48 | 38.11 | 54.88 | |||||||||||
2018 | 38.34 | 42.20 | 46.82 | 55.20 | 60.37 | 69.85 | 72.03 | 70.62 | b | 65.55 | 54.13 | 41.28 | a | 37.10 | 54.46 | |||||||||||
2019 | 37.68 | 37.76 | a | 46.97 | 52.30 | 54.90 | 66.53 | 72.89 | 72.90 | 66.10 | 52.84 | 44.67 | 37.21 | 53.56 | ||||||||||||
2020 | 37.34 | 40.76 | 46.87 | 52.07 | 60.85 | 67.97 | 73.65 | 73.13 | 64.10 | 54.98 | a | 46.25 | 34.60 | 54.38 | ||||||||||||
2021 | 36.27 | 39.14 | 43.61 | 52.82 | 59.08 | 70.12 | 71.87 | 70.45 | 65.40 | 53.52 | 46.41 | a | 40.82 | 54.13 | ||||||||||||
2022 | 36.43 | a | 36.93 | 44.24 | 53.32 | 60.27 | 69.28 | 72.71 | 69.94 | 65.50 | 53.27 | 39.60 | 37.77 | 53.27 | ||||||||||||
2023 | 34.89 | 36.93 | 43.85 | 50.85 | 57.63 | 63.70 | 75.47 | a | 72.13 | 66.60 | 55.84 | 45.58 | 37.68 | 53.43 | ||||||||||||
2024 | 36.55 | 41.18 | a | 44.27 | a | 50.74 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.18 | h | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 36.62 | 39.99 | 44.88 | 51.40 | 58.30 | 66.79 | 71.45 | 69.68 | 63.97 | 54.05 | 43.69 | 36.93 | 53.24 | |||||||||||||
S.D. | 2.26 | 2.62 | 2.40 | 2.15 | 1.71 | 2.19 | 1.43 | 1.46 | 1.69 | 1.68 | 2.13 | 1.89 | 0.82 | |||||||||||||
SKEW | -0.15 | -0.44 | -0.07 | -0.34 | 0.25 | -0.14 | 0.15 | 0.54 | -0.15 | 0.01 | -0.26 | 0.11 | -0.06 | |||||||||||||
MAX | 41.00 | 45.09 | 50.03 | 56.12 | 62.65 | 70.97 | 75.47 | 73.63 | 67.57 | 57.39 | 50.48 | 40.82 | 54.88 | |||||||||||||
MIN | 31.24 | 32.76 | 38.68 | 45.77 | 54.90 | 62.98 | 68.52 | 66.34 | 60.18 | 50.47 | 38.00 | 33.50 | 51.48 | |||||||||||||
YRS | 63 | 64 | 63 | 62 | 62 | 63 | 62 | 62 | 62 | 62 | 63 | 61 | 52 |