YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.80 | p | 68.40 | 62.92 | 45.68 | 32.35 | 12.70 | c | 44.41 | g | ||||
1949 | 2.94 | 6.34 | 25.23 | 48.19 | a | 58.53 | a | 64.97 | 70.70 | a | 71.10 | 55.17 | 43.73 | a | 39.32 | b | 12.31 | 41.54 | ||||||||
1950 | -4.93 | a | 17.71 | 23.24 | 36.10 | 50.26 | 61.12 | 65.32 | a | 65.56 | 55.72 | c | 47.63 | a | 25.85 | 18.02 | 38.47 | |||||||||
1951 | 9.45 | 19.21 | 16.85 | a | 39.47 | 55.08 | 58.40 | 69.45 | b | 66.48 | 53.67 | 42.07 | b | 26.02 | 8.05 | 38.68 | ||||||||||
1952 | 7.24 | b | 20.84 | 21.02 | a | 49.03 | 55.94 | 66.35 | 68.62 | b | 68.57 | a | 60.11 | c | 44.84 | 29.86 | a | 21.07 | a | 42.79 | ||||||
1953 | 23.82 | 24.65 | b | 31.23 | 37.30 | 51.65 | a | 64.12 | 70.12 | a | 70.05 | a | 58.48 | 50.76 | 38.50 | 26.42 | a | 45.59 | ||||||||
1954 | 7.02 | 36.62 | 24.28 | a | 41.36 | a | 52.45 | b | 60.85 | c | 73.64 | b | 67.94 | 56.90 | 44.39 | 38.47 | 26.92 | f | 45.81 | a | ||||||
1955 | 16.75 | a | 13.00 | 25.53 | 48.28 | 57.21 | 61.05 | 71.89 | 73.00 | b | 56.04 | d | 47.98 | d | 18.03 | 12.93 | a | 41.81 | ||||||||
1956 | 11.92 | 17.16 | 31.53 | 37.47 | 54.75 | a | 69.41 | h | 67.27 | a | 66.65 | e | 56.47 | 47.70 | a | 32.25 | 23.46 | c | 40.60 | a | ||||||
1957 | 4.31 | 18.29 | 30.76 | 39.90 | 54.47 | 61.92 | 74.06 | 70.16 | 55.10 | a | 44.16 | b | 32.12 | 29.21 | 42.87 | |||||||||||
1958 | 25.53 | 17.04 | 24.25 | g | 44.36 | a | 60.35 | a | 59.30 | 64.58 | a | 70.97 | a | 58.07 | a | 45.52 | 29.03 | a | 17.78 | a | 44.78 | a | ||||
1959 | 9.93 | a | 7.77 | 34.19 | 41.39 | b | 50.89 | d | 66.14 | e | 69.47 | a | 70.81 | b | 57.13 | d | 40.05 | c | 24.33 | f | 27.20 | d | 43.18 | a | ||
1960 | 12.60 | a | 14.84 | 22.22 | b | 43.39 | b | 53.86 | c | 62.04 | d | 72.07 | c | 66.34 | b | 57.78 | c | 44.35 | 26.30 | 17.37 | a | 41.10 | ||||
1961 | 19.75 | a | 24.20 | 35.47 | 35.93 | h | 53.50 | b | 66.95 | 70.16 | 72.10 | 50.55 | 43.11 | 28.78 | 10.93 | a | 43.23 | a | ||||||||
1962 | 13.28 | a | 15.38 | 23.21 | 44.57 | 54.61 | 63.95 | 66.08 | 68.73 | 56.08 | 48.92 | 36.27 | 23.32 | 42.87 | ||||||||||||
1963 | 5.00 | 23.98 | 36.73 | 41.83 | 53.61 | 66.05 | 72.13 | 68.45 | 62.98 | 53.19 | 32.30 | 15.22 | a | 44.29 | ||||||||||||
1964 | 21.37 | 25.79 | 25.10 | 44.63 | 57.55 | 62.73 | 72.34 | 66.71 | 53.23 | 46.61 | 24.50 | 6.29 | 42.24 | |||||||||||||
1965 | 11.48 | a | 17.38 | 15.53 | 41.80 | 54.35 | 64.55 | 70.45 | 65.89 | m | 47.27 | 50.56 | 32.27 | 27.48 | 39.38 | a | ||||||||||
1966 | 4.85 | 15.54 | 33.87 | 37.68 | 55.65 | 63.82 | 73.48 | 66.84 | 62.28 | 47.08 | 25.55 | 22.03 | 42.39 | |||||||||||||
1967 | 19.45 | a | 21.02 | 31.02 | 40.78 | 50.81 | 62.23 | 69.58 | 70.19 | 61.70 | 47.11 | 31.47 | 16.94 | 43.52 | ||||||||||||
1968 | 15.40 | a | 20.02 | a | 37.61 | 41.78 | 50.98 | 61.63 | 68.48 | 66.53 | 59.72 | 46.71 | 34.32 | 10.95 | 42.85 | |||||||||||
1969 | 0.29 | 16.46 | 24.42 | 50.66 | a | 56.66 | 60.00 | 68.89 | 73.35 | 61.65 | 40.82 | 34.53 | a | 21.81 | 42.46 | |||||||||||
1970 | 9.60 | 22.41 | 25.55 | 39.58 | 55.52 | 67.21 | a | 72.85 | 71.66 | 57.47 | 42.89 | 28.02 | 17.50 | 42.52 | ||||||||||||
1971 | 8.66 | 18.55 | 29.63 | a | 45.60 | a | 54.79 | 66.59 | b | 67.33 | b | 74.35 | 57.19 | a | 43.02 | h | 33.19 | d | 13.42 | f | 45.59 | b | ||||
1972 | ----- | z | 14.76 | l | 29.17 | m | 43.40 | 56.11 | 65.20 | 65.79 | 70.29 | 56.12 | 43.71 | 30.33 | 13.31 | 49.36 | c | |||||||||
1973 | 20.25 | a | 24.91 | 37.79 | 42.83 | 54.65 | 65.29 | f | 69.76 | 73.60 | 56.05 | 50.42 | f | 26.33 | f | 18.28 | m | 47.48 | d | |||||||
1974 | 15.05 | 27.57 | 32.47 | 46.28 | 52.33 | a | 64.73 | 75.11 | 63.73 | 55.07 | 48.82 | 32.15 | 25.72 | a | 44.92 | |||||||||||
1975 | 20.34 | 16.59 | 24.43 | a | 36.75 | 53.55 | 62.70 | 73.69 | 67.20 | c | ----- | z | 46.34 | 30.07 | b | 21.12 | a | 41.16 | a | |||||||
1976 | 16.72 | b | 31.02 | 30.38 | a | 47.30 | 55.34 | 66.27 | 73.06 | 72.61 | 62.66 | a | 41.66 | b | 26.48 | a | 20.35 | 45.32 | ||||||||
1977 | 3.52 | 28.43 | 35.50 | a | 49.38 | 62.95 | b | 67.70 | 72.66 | b | 63.68 | 58.29 | b | 47.38 | b | 27.65 | 13.21 | 44.19 | ||||||||
1978 | 1.55 | 8.77 | b | 31.65 | 44.15 | 57.15 | a | 65.12 | 68.55 | a | 68.58 | 61.70 | 47.08 | 24.79 | a | 11.85 | 40.91 | |||||||||
1979 | 1.00 | c | 7.82 | 27.15 | e | 40.55 | b | 51.76 | d | 66.05 | 72.06 | f | 68.75 | a | 63.39 | c | 48.77 | c | 28.48 | d | 28.93 | c | 39.33 | a | ||
1980 | 13.94 | 22.78 | b | 30.53 | b | 49.48 | 61.13 | a | 67.62 | 74.26 | 66.45 | 59.66 | a | 45.44 | e | 38.71 | d | 22.42 | 46.03 | |||||||
1981 | 28.19 | e | 25.93 | 37.63 | 49.46 | c | 57.24 | 62.57 | b | 74.23 | c | 71.73 | 61.27 | d | 47.06 | 36.81 | a | 19.21 | 47.61 | |||||||
1982 | 0.50 | c | 16.79 | 29.24 | b | 40.79 | a | 51.93 | c | 62.69 | a | 71.55 | c | 70.32 | 57.88 | a | 45.84 | c | 26.73 | b | 23.55 | 41.48 | ||||
1983 | 28.19 | 32.96 | 33.23 | 41.55 | a | 51.81 | b | 63.34 | a | 74.55 | a | 77.90 | a | 57.05 | b | 48.88 | f | 33.17 | c | 1.77 | a | 45.05 | a | |||
1984 | 22.66 | 33.66 | a | 30.50 | 44.80 | 53.54 | d | 66.06 | c | 74.00 | b | 75.29 | b | 53.11 | b | 44.54 | c | 31.65 | 12.07 | b | 45.16 | |||||
1985 | 14.61 | 18.36 | 33.93 | a | 49.07 | a | 62.83 | a | 62.15 | 74.02 | d | 67.46 | d | 55.58 | 47.36 | b | 16.85 | 15.82 | 43.17 | |||||||
1986 | 27.27 | a | 19.69 | a | 42.08 | a | 44.26 | c | 56.23 | a | 69.77 | d | 69.55 | a | 69.64 | f | 53.79 | b | 47.43 | b | 28.55 | b | 27.95 | a | 44.23 | a |
1987 | 25.77 | 32.52 | 34.32 | a | 52.73 | 61.42 | a | 69.67 | a | 71.85 | a | 66.15 | 60.23 | b | 46.19 | 37.90 | a | 28.02 | b | 48.90 | ||||||
1988 | 13.79 | 20.61 | b | 36.24 | 47.69 | d | 62.24 | 78.50 | e | 75.53 | b | 71.93 | c | 58.76 | a | 47.29 | 32.55 | 23.27 | c | 47.37 | ||||||
1989 | 20.50 | b | 8.50 | 29.35 | 45.62 | 57.71 | 64.43 | 76.89 | 71.89 | 59.72 | 47.24 | 34.37 | 15.10 | 44.28 | ||||||||||||
1990 | 27.27 | 27.09 | 36.79 | 45.10 | a | 55.81 | 66.82 | 72.45 | b | 73.63 | a | 64.98 | 47.50 | 36.00 | 14.17 | a | 47.30 | |||||||||
1991 | 13.71 | 33.20 | 36.00 | 46.70 | 58.11 | 67.63 | 72.43 | b | 74.70 | a | 60.66 | a | 43.50 | a | 29.17 | 28.07 | c | 46.99 | ||||||||
1992 | 28.82 | a | 33.71 | a | 39.80 | a | 45.30 | b | 58.76 | d | 66.33 | d | 64.58 | a | 65.65 | a | 58.98 | a | 46.78 | b | 31.33 | a | 18.45 | a | 46.54 | |
1993 | 12.90 | a | 14.52 | 36.87 | 44.87 | 56.33 | b | 60.90 | 63.56 | 65.98 | 55.16 | a | 45.50 | b | 27.79 | a | 28.03 | 42.70 | ||||||||
1994 | 11.05 | a | 12.20 | a | 37.47 | 46.33 | 59.20 | a | 65.81 | a | 68.60 | 70.67 | a | 62.84 | b | 49.19 | 33.14 | b | 26.50 | 45.25 | ||||||
1995 | 21.07 | a | 28.32 | c | 30.62 | c | 40.28 | a | 51.88 | b | 66.98 | c | 70.25 | e | 73.67 | d | 57.93 | a | 45.52 | c | 31.38 | b | 21.15 | e | 44.92 | |
1996 | 10.10 | 25.06 | b | 22.03 | a | 42.61 | b | 51.62 | a | 65.92 | e | 69.00 | d | 72.84 | c | 58.60 | a | 45.68 | a | 21.12 | 13.32 | a | 41.49 | |||
1997 | 9.93 | c | 27.98 | d | 31.43 | d | 39.52 | c | 54.11 | c | 67.91 | c | 70.57 | c | 68.02 | c | 62.32 | b | 48.27 | c | 31.35 | c | 27.90 | g | 46.49 | a |
1998 | 18.96 | h | 33.44 | d | 23.77 | e | 47.32 | b | 57.96 | e | 55.19 | l | 71.98 | c | 74.10 | 66.25 | b | 46.24 | b | 35.52 | c | 23.26 | d | 47.98 | b | |
1999 | 17.80 | d | 31.46 | c | 38.13 | d | 44.85 | c | 56.32 | i | 63.16 | a | 71.54 | e | 71.63 | d | 52.52 | f | 45.02 | g | 40.02 | h | 26.35 | h | 48.37 | e |
2000 | 21.98 | g | 28.48 | e | 39.93 | j | 42.35 | g | 56.46 | d | 62.17 | c | 74.43 | h | 74.50 | i | 59.24 | k | 50.79 | j | 20.92 | r | 17.00 | v | 49.04 | i |
2001 | 25.77 | k | 15.05 | q | 33.47 | o | 47.27 | j | 57.02 | c | 62.08 | f | 73.11 | h | 74.24 | j | 63.53 | k | ----- | z | ----- | z | 20.35 | r | 57.02 | k |
2002 | 22.06 | n | 32.44 | l | 20.47 | m | 40.36 | l | 53.79 | j | 68.62 | e | 77.06 | f | 72.83 | p | 62.69 | i | 37.42 | 34.36 | e | 23.45 | 40.96 | h | ||
2003 | 14.21 | e | 14.00 | l | 29.24 | l | 48.97 | l | 55.15 | k | 62.07 | b | 75.38 | b | 77.92 | f | 62.37 | k | 52.84 | 26.18 | 29.56 | m | 46.14 | g | ||
2004 | 14.33 | m | 24.29 | e | ----- | z | 47.72 | 54.00 | b | ----- | z | 74.46 | c | 66.85 | d | 64.07 | c | 49.78 | m | 36.25 | j | 28.77 | k | 55.23 | f | |
2005 | 15.72 | k | 31.87 | i | 36.55 | l | 49.29 | a | ----- | z | 65.31 | d | 74.18 | i | 69.16 | c | 61.98 | 48.10 | j | 37.21 | k | 23.05 | a | 53.76 | g | |
2006 | 32.50 | h | ----- | z | 33.25 | s | 50.38 | 57.13 | a | 66.97 | 75.86 | t | 71.55 | a | 56.02 | 41.18 | 30.98 | 23.34 | c | 49.69 | d | |||||
2007 | 20.27 | a | 15.18 | 38.37 | 41.22 | 55.69 | 65.93 | 75.98 | 69.29 | 58.73 | 46.39 | 31.52 | a | 17.29 | b | 44.66 | ||||||||||
2008 | 13.23 | a | 16.21 | 31.62 | a | 41.47 | a | 53.52 | a | 62.61 | b | 72.43 | a | 70.84 | 55.82 | b | 43.81 | 32.54 | b | 9.19 | 41.94 | |||||
2009 | 11.85 | 18.13 | a | 25.98 | 40.90 | a | 53.50 | 61.72 | a | 66.93 | a | 65.42 | 64.29 | b | 37.92 | 36.86 | a | 7.77 | 40.94 | |||||||
2010 | 12.32 | 11.32 | 32.56 | 45.60 | 50.40 | a | 63.27 | 68.69 | 69.56 | 55.80 | 48.02 | c | 27.50 | 12.09 | c | 41.43 | ||||||||||
2011 | 11.66 | 9.68 | 23.00 | 39.43 | 49.95 | 61.86 | b | 71.98 | d | 68.87 | 58.62 | 48.05 | a | 29.40 | d | 22.92 | g | 42.95 | a | |||||||
2012 | 22.26 | b | 21.12 | 42.27 | 46.45 | a | 54.57 | b | 66.41 | a | 75.80 | c | 67.92 | a | ----- | z | 41.97 | 32.00 | a | 16.95 | a | 44.34 | a | |||
2013 | 17.67 | a | 26.02 | 27.71 | 36.10 | 55.22 | b | 61.40 | 69.25 | e | 69.50 | i | 65.18 | e | 37.73 | r | 28.95 | a | 9.60 | a | 39.71 | b | ||||
2014 | 17.97 | a | 10.79 | 27.00 | 40.00 | 52.02 | d | 60.11 | b | 68.18 | a | 66.57 | d | 56.12 | a | 47.77 | 24.45 | b | 22.42 | a | 41.12 | |||||
2015 | 18.90 | a | 18.04 | 36.47 | 44.72 | 51.87 | a | 65.79 | f | 70.80 | c | 69.12 | e | 62.45 | b | 48.02 | 33.19 | a | 22.73 | c | 43.30 | a | ||||
2016 | 18.66 | c | 31.56 | b | 38.90 | a | 43.61 | b | 54.98 | 67.13 | k | 66.89 | v | 69.43 | q | 60.54 | f | 47.94 | e | 39.69 | c | 11.43 | b | 35.85 | d | |
2017 | 10.97 | a | 23.80 | 33.76 | 43.48 | a | 54.72 | b | 65.05 | a | 75.71 | e | 66.09 | i | 57.62 | m | 43.79 | b | 30.31 | a | 19.17 | a | 40.08 | b | ||
2018 | 13.31 | 5.46 | 27.18 | 36.50 | 58.73 | e | 66.70 | c | 70.85 | e | 68.72 | a | 56.18 | b | 39.53 | 28.10 | a | 25.32 | a | 41.38 | ||||||
2019 | 18.63 | -0.59 | 22.03 | 44.88 | a | 48.00 | 62.83 | 70.27 | 68.98 | a | 58.72 | 37.58 | 26.64 | l | 20.70 | f | 43.13 | b | ||||||||
2020 | 17.78 | a | 23.28 | 32.35 | g | 37.64 | h | 54.14 | b | 66.36 | a | 70.42 | 71.30 | a | 58.04 | d | 38.02 | a | 33.00 | b | 26.52 | a | 45.89 | b | ||
2021 | 25.44 | f | 6.25 | d | 36.90 | 40.81 | a | 52.67 | a | 69.19 | a | 75.86 | f | 68.34 | c | 60.43 | b | 47.93 | a | 35.91 | c | 17.69 | b | 43.61 | b | |
2022 | 18.35 | a | 18.13 | a | 31.50 | 37.57 | g | 51.72 | d | 62.48 | a | 71.28 | m | 71.33 | d | 61.96 | b | 53.18 | q | ----- | z | ----- | z | 45.07 | e | |
2023 | ----- | z | ----- | z | ----- | z | 39.00 | b | 59.97 | 67.82 | ----- | z | ----- | z | 63.56 | m | 48.37 | d | 33.68 | h | 29.14 | c | 48.86 | g | ||
2024 | 14.34 | b | 26.55 | j | 31.35 | g | 45.76 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 14.34 | k |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 14.46 | 20.37 | 30.76 | 43.61 | 55.12 | 64.66 | 71.02 | 69.65 | 58.58 | 45.65 | 30.88 | 18.95 | 43.46 | |||||||||||||
S.D. | 7.61 | 8.22 | 6.10 | 3.98 | 3.23 | 3.15 | 3.08 | 2.95 | 3.64 | 3.37 | 4.73 | 6.63 | 2.40 | |||||||||||||
SKEW | -0.20 | -0.15 | -0.30 | 0.04 | 0.43 | 1.09 | -0.32 | 0.27 | -0.24 | -0.59 | -0.49 | -0.30 | 0.23 | |||||||||||||
MAX | 28.82 | 36.62 | 42.27 | 52.73 | 62.95 | 78.50 | 76.89 | 77.90 | 66.25 | 53.19 | 39.69 | 29.21 | 48.90 | |||||||||||||
MIN | -4.93 | -0.59 | 15.53 | 36.10 | 48.00 | 58.40 | 63.56 | 63.68 | 47.27 | 37.42 | 16.85 | 1.77 | 38.47 | |||||||||||||
YRS | 66 | 68 | 64 | 68 | 71 | 68 | 65 | 66 | 66 | 66 | 66 | 64 | 41 |