YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.20 | 42.39 | 34.17 | 34.53 | p | 40.58 | i | |||
1943 | 35.21 | b | 38.85 | b | 42.32 | 44.30 | 46.94 | 47.53 | 53.84 | 59.16 | 56.13 | 48.87 | a | 37.66 | a | 38.42 | e | 45.77 | ||||||||
1944 | 36.11 | c | 34.79 | a | 36.61 | 39.30 | 45.61 | 46.45 | a | 49.42 | 54.16 | 51.48 | a | 45.13 | 40.40 | 36.16 | 42.97 | |||||||||
1945 | 34.24 | b | 36.04 | e | 36.48 | 38.93 | 44.03 | 48.79 | a | 59.61 | 57.30 | k | 54.47 | 47.48 | 36.40 | 35.45 | 42.90 | a | ||||||||
1946 | 30.77 | 30.14 | 35.77 | 41.20 | 44.45 | 46.50 | 55.77 | a | 56.74 | 52.97 | 41.71 | 35.77 | 35.74 | 42.29 | ||||||||||||
1947 | 29.03 | 35.04 | 38.23 | 41.20 | 44.52 | 47.10 | 51.74 | 55.13 | 53.57 | 44.29 | 33.60 | 32.65 | 42.17 | |||||||||||||
1948 | 29.29 | 29.10 | 32.19 | 38.83 | 42.06 | 46.93 | 51.26 | 51.61 | 50.07 | 43.74 | 33.10 | 28.52 | 39.73 | |||||||||||||
1949 | 25.19 | 29.21 | 33.61 | 39.73 | 42.42 | 48.11 | b | 52.68 | 50.84 | 49.53 | 38.42 | 36.77 | 28.84 | 39.61 | ||||||||||||
1950 | 26.61 | 31.71 | 32.87 | 38.90 | 39.28 | b | 42.70 | 54.90 | 49.52 | 45.73 | 39.45 | 34.73 | 29.61 | 38.84 | ||||||||||||
1951 | 26.97 | 29.36 | 33.06 | 39.60 | 40.64 | c | 42.47 | 51.48 | 50.45 | b | 55.80 | 43.65 | 36.63 | 31.29 | 40.12 | |||||||||||
1952 | 30.97 | 33.52 | 34.23 | 41.27 | 43.65 | 43.97 | 54.10 | 57.16 | 52.93 | 41.84 | 33.10 | 31.06 | 41.48 | |||||||||||||
1953 | 33.71 | 26.11 | 31.45 | 35.60 | 36.03 | 42.83 | 56.32 | 50.77 | 45.23 | 38.42 | 34.87 | 26.83 | a | 38.18 | ||||||||||||
1954 | 25.87 | 30.82 | 31.29 | 37.47 | 43.23 | a | 47.73 | 59.16 | 49.52 | 46.83 | 38.55 | 34.87 | 29.26 | 39.55 | ||||||||||||
1955 | 28.52 | 29.04 | 33.61 | 33.43 | 41.06 | 43.17 | 51.39 | 58.81 | 46.53 | 37.65 | 32.17 | 31.48 | 38.90 | |||||||||||||
1956 | 29.06 | 25.52 | 28.03 | 34.93 | 42.64 | c | 45.93 | 52.13 | a | 45.03 | 48.70 | 39.10 | 32.00 | 29.03 | a | 37.68 | ||||||||||
1957 | 33.19 | 37.64 | 37.39 | 38.73 | 43.23 | 48.77 | 52.45 | 52.68 | 45.37 | 42.29 | 33.90 | 32.68 | 41.53 | |||||||||||||
1958 | 28.87 | 35.43 | 33.45 | 38.17 | 44.19 | 45.83 | 49.10 | 58.84 | 50.80 | 45.29 | 33.23 | 30.39 | 41.13 | |||||||||||||
1959 | 29.94 | 31.52 | a | 35.32 | 42.40 | 42.68 | 48.67 | 58.35 | 54.39 | 47.62 | a | 41.97 | 36.60 | 33.61 | 41.92 | |||||||||||
1960 | 27.37 | a | 31.69 | 36.13 | 36.47 | 40.94 | 46.30 | 52.10 | 50.42 | 48.40 | 37.71 | 31.66 | a | 25.06 | 38.69 | |||||||||||
1961 | 26.71 | 29.43 | 32.10 | 36.17 | 38.26 | 47.90 | 55.26 | 56.61 | 44.33 | 38.00 | 32.38 | a | 30.23 | 38.95 | ||||||||||||
1962 | 28.94 | 33.54 | 31.94 | 39.30 | 39.94 | 45.00 | 48.42 | 51.13 | 46.37 | 38.50 | a | 29.32 | b | 25.97 | 38.20 | |||||||||||
1963 | 24.90 | 34.52 | a | 30.65 | 33.63 | 41.33 | a | 45.43 | 47.90 | 53.17 | a | 50.62 | a | 44.42 | 34.93 | 26.55 | 39.00 | |||||||||
1964 | 25.61 | 25.83 | 31.39 | 36.40 | 40.35 | 45.70 | 52.93 | a | 54.07 | a | 43.70 | 44.84 | 32.70 | 31.48 | 38.75 | |||||||||||
1965 | 30.10 | 27.75 | 34.37 | a | 37.83 | 41.39 | 43.73 | 49.87 | 53.00 | a | 41.97 | 38.11 | c | 37.55 | a | 32.26 | 38.99 | |||||||||
1966 | 27.45 | 30.14 | 33.97 | 38.67 | 44.60 | a | 46.37 | c | 52.10 | b | 57.03 | a | 48.27 | 40.81 | 36.73 | 32.90 | 40.75 | |||||||||
1967 | 29.65 | 29.68 | 36.81 | 34.20 | 42.48 | 46.23 | 58.65 | 60.87 | 53.50 | 41.00 | a | 38.80 | 29.19 | 41.75 | ||||||||||||
1968 | 27.94 | 36.14 | a | 33.77 | 35.53 | 43.19 | 46.10 | 55.00 | 50.45 | 46.60 | 39.26 | 33.67 | 24.90 | 39.38 | ||||||||||||
1969 | 35.48 | 32.93 | 33.13 | 38.80 | 43.52 | 47.83 | 54.26 | 56.71 | 53.00 | 36.48 | 37.47 | 27.63 | a | 41.44 | ||||||||||||
1970 | 30.42 | 30.71 | 33.13 | 32.10 | 41.03 | 48.53 | 57.80 | a | 59.00 | 45.47 | 39.81 | 34.43 | 30.55 | 40.25 | ||||||||||||
1971 | 28.87 | 30.46 | 36.68 | 43.07 | a | 41.55 | 42.10 | 51.06 | 57.48 | 47.87 | 36.00 | 29.07 | 28.19 | 39.37 | ||||||||||||
1972 | 24.03 | 29.14 | 34.81 | 35.00 | 41.57 | a | 50.50 | 53.71 | 53.17 | a | 46.97 | 40.45 | 31.69 | a | 27.55 | 39.05 | ||||||||||
1973 | 26.48 | 33.11 | 32.77 | 35.03 | 41.94 | 46.57 | 48.52 | 51.79 | c | 39.68 | b | 32.53 | a | 29.60 | 25.19 | 36.93 | ||||||||||
1974 | 28.93 | a | 26.85 | a | 34.77 | 36.48 | a | 41.61 | 47.97 | a | 53.50 | a | 49.84 | 49.80 | 39.39 | 32.50 | 24.94 | 38.88 | ||||||||
1975 | 26.74 | 28.63 | a | 32.14 | b | 34.93 | 41.93 | a | 48.72 | a | 57.60 | a | 50.13 | 49.69 | a | ----- | z | 29.53 | 29.48 | 39.05 | a | |||||
1976 | 27.13 | 33.90 | 34.13 | 37.73 | 45.32 | c | ----- | z | 52.39 | 45.39 | 53.13 | 39.48 | 32.23 | 21.94 | 38.43 | a | ||||||||||
1977 | 30.48 | 26.89 | 27.68 | 35.47 | 39.70 | a | 47.33 | 51.37 | d | 55.61 | ----- | z | ----- | z | 29.67 | 32.74 | 37.69 | b | ||||||||
1978 | ----- | z | 32.82 | 38.48 | 37.40 | ----- | z | 46.33 | ----- | z | 51.32 | ----- | z | 42.58 | 32.03 | 25.42 | 38.30 | d | ||||||||
1979 | 29.48 | 28.89 | 34.39 | c | 37.80 | 42.50 | a | ----- | z | 51.77 | 51.19 | 48.23 | 38.87 | 28.07 | a | ----- | z | 39.12 | b | |||||||
1980 | 36.42 | 36.38 | 34.97 | 39.17 | a | 42.30 | a | 43.07 | 55.10 | 52.26 | 46.73 | 41.81 | 32.00 | 31.10 | 40.94 | |||||||||||
1981 | 31.90 | 32.18 | 36.42 | 40.73 | 44.71 | 51.57 | 53.16 | 54.61 | 47.97 | ----- | z | 31.93 | 29.03 | 41.29 | a | |||||||||||
1982 | 30.87 | h | 35.84 | c | 35.87 | 38.20 | 43.83 | a | 45.10 | 51.10 | 54.60 | a | 50.07 | 36.40 | a | 31.63 | 27.13 | 40.89 | a | |||||||
1983 | 30.90 | 33.18 | 37.55 | 33.97 | 41.00 | 45.24 | a | 49.42 | 58.32 | 54.10 | 45.65 | 35.23 | 33.29 | 41.49 | ||||||||||||
1984 | 30.33 | a | 28.24 | 32.42 | 35.67 | 43.29 | 49.03 | 61.29 | 58.97 | 55.50 | ----- | z | 33.40 | 31.03 | b | 41.74 | a | |||||||||
1985 | 31.23 | 30.39 | 32.68 | 39.33 | 41.48 | 46.87 | 55.35 | 48.29 | 45.67 | 40.13 | 34.33 | 30.83 | a | 39.72 | ||||||||||||
1986 | 34.42 | 35.61 | 38.34 | b | 38.13 | 40.81 | 47.87 | 51.13 | 54.68 | 42.60 | 38.13 | 33.60 | 28.97 | 40.36 | ||||||||||||
1987 | 26.77 | 29.75 | 33.37 | a | 38.31 | a | 44.19 | 46.50 | 46.16 | 50.17 | a | 45.03 | a | 44.13 | 34.14 | a | 25.65 | 38.68 | ||||||||
1988 | 28.70 | a | 31.85 | c | 32.13 | 37.63 | 39.90 | 44.40 | 53.00 | a | 51.81 | 45.00 | a | 39.71 | 34.07 | 27.23 | 38.79 | |||||||||
1989 | 26.55 | 31.36 | 35.40 | a | 38.53 | 40.32 | 44.53 | 50.06 | 46.29 | 43.20 | 37.48 | 30.17 | a | 25.90 | a | 37.48 | ||||||||||
1990 | 28.10 | 27.44 | a | 35.39 | 41.77 | 40.81 | 47.97 | 52.45 | 50.39 | 47.53 | 37.50 | a | 32.03 | 25.65 | 38.92 | |||||||||||
1991 | 29.61 | 30.57 | 33.50 | a | 36.48 | a | 39.45 | 43.27 | 52.87 | 52.58 | 51.40 | 44.39 | 34.70 | 32.41 | b | 40.10 | ||||||||||
1992 | 30.77 | 36.52 | 38.84 | 41.60 | 47.94 | 47.50 | 53.81 | 57.03 | 46.76 | a | 41.19 | 32.00 | ----- | z | 43.09 | a | ||||||||||
1993 | 34.71 | 35.92 | b | 38.10 | 39.20 | 46.13 | 47.30 | 47.00 | 50.06 | 46.27 | 41.23 | 34.90 | 29.26 | 40.84 | ||||||||||||
1994 | 29.87 | 32.61 | 37.94 | 39.10 | 43.68 | 47.57 | 50.71 | 54.97 | 46.97 | 37.94 | 28.27 | 29.39 | 39.92 | |||||||||||||
1995 | 36.03 | a | 38.39 | 38.94 | 36.60 | 42.68 | 46.10 | 49.90 | 54.94 | 50.57 | 39.90 | a | 36.57 | 31.58 | 41.85 | |||||||||||
1996 | 30.81 | 37.59 | 35.81 | 38.73 | 43.06 | 45.90 | 57.58 | 55.32 | 49.37 | 37.70 | a | 35.53 | 32.40 | a | 41.65 | |||||||||||
1997 | 35.71 | 31.21 | 34.39 | 37.83 | ----- | z | 45.20 | 46.87 | 53.81 | 51.27 | 37.43 | a | 32.43 | 27.50 | a | 39.42 | a | |||||||||
1998 | 29.48 | 32.00 | 33.23 | 34.33 | 38.71 | ----- | z | 49.39 | 52.55 | 44.73 | 32.00 | 26.93 | 22.32 | 35.97 | a | |||||||||||
1999 | 22.65 | 24.89 | a | 27.10 | a | 29.60 | 35.48 | 39.17 | 46.26 | 46.06 | 45.93 | 37.27 | a | 30.90 | 25.61 | 34.24 | ||||||||||
2000 | 31.07 | a | 35.14 | 34.45 | 37.37 | 43.74 | 47.27 | 48.13 | 54.71 | 46.63 | 40.97 | 28.10 | 27.84 | 39.62 | ||||||||||||
2001 | 28.03 | 31.18 | 37.33 | a | 36.63 | 44.84 | 47.30 | 49.97 | 53.71 | 46.07 | 39.35 | 33.47 | 25.55 | 39.45 | ||||||||||||
2002 | 24.70 | a | 25.57 | 28.19 | 34.80 | 37.97 | 42.20 | 51.10 | 44.84 | 45.07 | 34.52 | 31.07 | 23.94 | 35.33 | ||||||||||||
2003 | 27.52 | 28.82 | 30.71 | 30.03 | ----- | z | 43.57 | 49.58 | 50.71 | 44.73 | 36.58 | 28.83 | 21.77 | 35.71 | a | |||||||||||
2004 | 20.84 | 22.90 | 30.42 | 31.50 | 34.16 | 37.83 | 43.71 | 43.26 | 37.07 | a | 31.45 | 23.27 | 28.32 | 32.06 | ||||||||||||
2005 | 32.60 | a | 34.22 | a | 32.39 | 31.50 | 37.13 | 39.93 | 47.71 | 47.29 | 33.37 | 38.14 | c | 33.71 | b | 27.93 | b | 36.33 | ||||||||
2006 | 27.59 | d | 28.00 | c | 32.25 | c | 38.58 | d | 44.68 | c | 50.27 | 62.28 | b | 51.52 | 47.69 | a | 39.18 | c | 33.17 | a | 25.13 | a | 40.03 | |||
2007 | 23.61 | 31.37 | a | 33.35 | e | 38.46 | f | 42.94 | 44.53 | 57.38 | b | 57.76 | b | 48.96 | d | 39.63 | d | 32.59 | a | 26.17 | a | 39.84 | a | |||
2008 | 30.83 | a | 30.68 | a | 31.67 | a | 35.28 | a | 41.10 | 46.60 | 55.71 | 55.94 | 49.17 | a | 38.47 | a | 36.67 | 29.60 | a | 40.14 | ||||||
2009 | 29.13 | 27.86 | 27.45 | 31.40 | 39.87 | 42.77 | 54.74 | 51.35 | 45.73 | 36.68 | 31.13 | 28.71 | 37.24 | |||||||||||||
2010 | 29.29 | 32.80 | c | 33.10 | 32.47 | 35.68 | 41.73 | 50.87 | 46.68 | 40.27 | 40.55 | 26.00 | 29.58 | 36.58 | ||||||||||||
2011 | 26.45 | 25.11 | 31.67 | a | 35.86 | a | 35.48 | 41.04 | b | 49.87 | 48.39 | 44.93 | a | 36.55 | 33.23 | 25.77 | 36.20 | |||||||||
2012 | 28.48 | 29.68 | a | 32.25 | g | 37.83 | 41.26 | 43.83 | 51.42 | 59.77 | a | 52.03 | 39.81 | 33.69 | a | 30.71 | 40.77 | a | ||||||||
2013 | 27.29 | 27.82 | 34.03 | 37.47 | 43.13 | 44.37 | 55.58 | 52.35 | 48.70 | 34.94 | 35.87 | 31.07 | a | 39.38 | ||||||||||||
2014 | 29.00 | 32.61 | 36.03 | 37.17 | 42.35 | 43.80 | 54.55 | 53.71 | 52.03 | 41.48 | 35.87 | 35.19 | 41.15 | |||||||||||||
2015 | 31.94 | 33.68 | 35.97 | b | 37.23 | 44.74 | 51.57 | 54.10 | 54.40 | a | 53.43 | 47.67 | a | 30.97 | 27.03 | 41.89 | ||||||||||
2016 | 31.39 | 32.10 | 34.97 | 38.13 | 44.35 | 50.86 | a | 53.90 | 53.58 | 46.79 | a | 41.48 | 35.47 | 33.52 | 41.38 | |||||||||||
2017 | 34.16 | 35.36 | 36.80 | a | 37.97 | 43.79 | b | 49.57 | 58.00 | c | 55.68 | c | 50.33 | 39.90 | 37.07 | 28.77 | 42.28 | |||||||||
2018 | 33.13 | 28.96 | 35.68 | 36.43 | 44.32 | 46.27 | 59.77 | 56.42 | 48.28 | a | 42.58 | 34.27 | 30.57 | c | 41.39 | |||||||||||
2019 | 32.45 | 31.15 | a | 35.60 | a | 39.87 | 44.45 | b | 49.76 | a | 51.86 | c | 51.38 | b | 49.28 | a | 35.03 | b | 32.50 | b | 33.87 | 40.60 | ||||
2020 | 29.79 | b | 30.36 | a | 35.97 | a | 41.73 | 45.13 | a | 47.04 | d | 49.41 | b | 55.10 | 48.60 | 40.53 | a | 33.00 | a | 27.26 | 40.33 | |||||
2021 | 29.27 | a | 29.39 | 31.81 | 37.17 | 42.52 | b | 51.85 | d | 60.00 | f | 55.77 | e | 51.07 | 38.39 | 34.12 | d | 31.03 | b | 39.31 | a | |||||
2022 | 30.97 | a | 27.58 | b | 33.31 | b | 37.82 | b | 41.55 | 49.21 | b | 55.90 | a | 59.48 | 54.25 | b | 43.38 | b | 30.57 | 29.90 | a | 41.16 | ||||
2023 | 32.48 | d | 28.74 | a | 34.82 | c | 37.20 | 45.27 | a | 45.14 | a | 55.35 | 54.00 | 50.30 | 42.69 | b | 33.73 | 33.68 | c | 41.12 | ||||||
2024 | 31.03 | 34.03 | 35.94 | 37.09 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.67 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 29.60 | 31.27 | 34.14 | 37.28 | 42.05 | 46.08 | 52.80 | 53.11 | 48.10 | 39.98 | 33.14 | 29.27 | 39.71 | |||||||||||||
S.D. | 3.24 | 3.45 | 2.82 | 2.90 | 2.71 | 2.83 | 3.71 | 3.88 | 4.11 | 3.42 | 2.96 | 3.39 | 2.16 | |||||||||||||
SKEW | 0.03 | 0.06 | -0.17 | -0.36 | -0.76 | -0.40 | 0.23 | -0.30 | -0.59 | 0.12 | -0.51 | 0.12 | -0.73 | |||||||||||||
MAX | 36.42 | 38.85 | 42.32 | 44.30 | 47.94 | 51.85 | 62.28 | 60.87 | 56.13 | 48.87 | 40.40 | 38.42 | 45.77 | |||||||||||||
MIN | 20.84 | 22.90 | 27.10 | 29.60 | 34.16 | 37.83 | 43.71 | 43.26 | 33.37 | 31.45 | 23.27 | 21.77 | 32.06 | |||||||||||||
YRS | 80 | 82 | 81 | 80 | 78 | 78 | 79 | 80 | 80 | 78 | 82 | 79 | 65 |