VIENNA, MARYLAND

Monthly Average Maximum Temperature (Degrees Fahrenheit)

(189140)

File last updated on May 16,
*** Note *** Provisional Data *** After Year/Month 201005
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1949 ----- z ----- z ----- z ----- z ----- z ----- z 88.80 a 86.19 77.57 73.79 c 59.45 a 52.65 h 77.16
1950 58.46 c 47.62 d 52.87 62.70 73.58 83.80 85.68 83.90 76.13 71.29 59.33 45.13 66.71
1951 49.94 50.21 56.28 b 66.67 75.43 a 83.40 87.23 84.80 a 80.26 c 72.74 58.33 c 51.84 68.09
1952 49.68 49.00 55.23 67.27 74.58 86.27 89.58 84.77 80.20 66.71 58.40 48.52 67.52
1953 51.55 51.57 56.87 65.67 79.03 82.73 89.26 86.77 80.57 72.26 59.87 50.94 68.92
1954 45.39 54.07 56.68 68.67 73.45 84.80 88.06 85.03 82.10 74.00 b 58.10 a 47.48 68.15
1955 43.77 50.11 58.40 a 68.53 77.35 80.57 89.62 b 87.29 78.80 70.71 57.63 42.90 67.14
1956 41.74 50.90 54.45 63.30 74.45 84.37 86.16 86.55 78.23 69.32 58.80 55.68 67.00
1957 42.16 50.71 54.06 71.97 77.32 87.60 89.29 86.03 80.47 65.45 59.83 52.10 68.08
1958 42.29 41.43 49.94 66.40 74.94 81.13 88.65 85.10 79.30 68.97 62.27 41.32 65.14
1959 45.84 49.61 58.00 68.47 78.90 a 86.47 86.90 87.74 82.28 a 71.35 58.90 a 51.52 68.83
1960 48.10 48.57 a 44.29 73.23 74.94 84.33 85.00 86.55 80.67 69.68 61.20 44.03 66.72
1961 41.39 49.57 58.39 62.27 72.68 82.97 87.74 86.13 84.63 71.61 60.20 45.87 66.95
1962 45.23 44.29 52.90 66.27 79.81 82.50 83.61 85.61 76.90 70.61 54.83 41.45 65.33
1963 42.42 41.46 59.52 68.23 75.23 84.03 87.68 85.55 76.30 73.45 60.40 40.97 66.27
1964 47.94 45.24 58.39 65.00 78.03 b 84.53 86.00 83.20 a 80.37 67.00 62.57 50.61 67.41
1965 48.15 k 47.50 52.45 61.10 76.37 l 81.83 86.84 85.81 81.80 67.94 59.73 52.10 67.71
1966 40.77 45.21 58.13 62.10 75.00 83.60 88.94 86.84 78.20 69.19 60.57 46.29 66.24
1967 49.52 44.32 54.84 67.10 70.45 83.63 85.23 83.16 78.53 70.06 54.70 49.39 65.91
1968 41.16 43.76 59.42 69.03 74.71 85.43 88.94 89.19 82.67 71.77 59.83 46.32 67.69
1969 41.77 43.14 52.32 ----- z 78.03 86.97 88.16 86.94 o 81.17 70.10 57.83 a 43.68 64.32
1970 38.71 47.46 51.55 66.40 79.42 85.37 87.39 88.61 85.07 72.35 60.10 48.26 67.56
1971 40.48 49.07 54.71 67.70 74.68 86.40 88.29 86.00 82.60 74.87 59.63 c 58.90 68.61
1972 48.13 45.90 55.81 64.50 73.81 80.27 88.19 86.87 80.03 66.26 56.43 53.39 66.63
1973 46.71 46.14 60.48 66.47 73.35 85.60 88.74 88.10 83.47 73.16 61.07 50.45 68.65
1974 51.03 47.93 57.32 65.04 b 73.77 77.70 84.97 84.81 74.76 i 62.42 55.33 c 50.74 d 64.64
1975 49.94 n 49.37 a 54.00 62.57 78.71 85.07 86.96 c 90.00 79.10 72.87 65.13 50.48 70.39
1976 43.20 a 57.38 60.26 71.93 75.45 86.31 a 87.55 84.33 d 81.20 j 64.61 53.79 b 44.71 66.32
1977 35.06 48.93 61.32 71.93 79.52 82.40 90.13 a 89.10 82.57 67.64 c 59.37 47.90 67.99
1978 40.77 36.64 52.58 67.45 a 73.42 85.30 86.90 89.94 82.57 70.42 60.70 51.84 66.54
1979 45.03 35.32 60.77 65.67 77.55 82.03 86.52 87.00 80.58 d 69.00 b 65.07 b 50.77 e 67.11
1980 43.68 c 40.52 ----- z 67.80 e 73.78 m ----- z ----- z ----- z 83.72 l 67.43 c 56.40 47.86 b 53.95
1981 38.90 a 52.85 a 55.25 c 70.81 c 75.42 87.76 a 89.44 d 85.57 a 81.21 a 68.21 b 58.20 46.23 67.49
1982 38.71 46.68 56.71 65.47 80.19 82.47 89.90 85.16 79.63 69.23 61.73 53.52 b 67.45
1983 45.10 46.54 57.45 63.97 74.45 86.27 92.97 90.10 82.07 70.13 61.33 46.87 68.10
1984 39.94 53.52 52.45 65.17 75.65 86.63 86.29 87.00 80.40 74.45 57.77 57.19 68.04
1985 39.80 a 47.50 61.13 74.87 78.87 81.75 b 88.29 86.77 83.97 74.61 65.43 46.84 69.15
1986 46.74 44.86 60.03 69.13 82.84 88.87 94.00 86.19 83.10 74.58 59.23 50.19 69.98
1987 43.29 45.11 59.52 65.77 81.35 89.00 a 93.74 90.23 83.40 67.71 ----- z 52.89 d 70.18
1988 41.26 49.86 59.52 66.92 d 78.06 88.40 ----- z 90.50 c 80.57 65.77 a 61.57 48.97 66.49
1989 49.71 48.07 56.55 67.03 76.77 88.40 89.23 86.30 a 81.80 73.10 58.20 36.74 67.66
1990 52.87 56.92 b 61.65 69.71 b 75.94 86.73 91.03 86.55 ----- z 74.52 62.70 55.16 70.34
1991 47.65 54.00 a 59.03 67.27 77.42 87.83 91.65 88.10 81.33 73.23 59.23 54.00 70.06
1992 50.19 50.48 54.87 67.90 ----- z ----- z 89.00 84.26 79.77 68.06 60.10 a 49.10 65.37
1993 ----- z 44.11 53.42 66.86 a 77.43 j 85.40 92.90 88.65 81.40 69.81 60.17 47.03 68.97
1994 41.35 46.04 56.87 73.20 74.65 87.83 90.77 86.10 81.53 69.58 64.27 54.10 68.86
1995 49.16 45.07 60.77 69.87 76.55 84.20 90.84 90.35 81.20 75.00 55.47 49.00 t 70.77
1996 43.29 47.55 52.19 66.53 74.77 85.97 87.03 85.77 80.70 70.26 54.40 52.52 66.75
1997 47.45 52.21 59.03 64.47 74.65 82.80 90.71 86.48 81.30 70.32 56.07 49.87 67.95
1998 52.87 52.07 57.58 68.90 78.16 84.13 89.55 88.97 85.50 71.52 61.47 53.65 70.36
1999 53.45 49.64 55.87 69.30 78.48 83.80 91.97 87.53 a 79.87 69.28 m 64.90 52.32 69.74
2000 46.32 51.36 a 63.68 65.87 78.71 85.47 85.42 85.81 78.40 73.13 57.33 42.16 67.80
2001 45.74 51.32 55.06 68.37 75.94 86.30 86.94 89.00 80.47 73.30 k 65.90 57.03 69.28
2002 51.84 55.86 60.87 72.67 78.32 87.97 92.39 91.32 82.87 69.48 58.00 47.61 70.77
2003 41.13 ----- z 61.16 67.29 b 71.42 82.60 89.74 88.77 81.15 d 70.37 d 65.93 49.03 69.87
2004 42.22 d 50.08 c 59.74 68.20 83.61 83.67 f 88.73 e 84.97 81.97 68.29 61.30 51.90 67.36
2005 46.23 49.25 52.45 69.40 73.26 85.43 90.45 89.87 85.60 72.23 63.17 47.68 68.75
2006 53.61 50.64 58.97 72.20 78.13 84.93 90.03 89.96 c 78.33 68.84 62.37 56.13 70.35
2007 51.32 39.96 b 62.83 a 67.66 a 78.94 86.27 88.39 90.61 c 84.23 77.81 58.80 51.65 69.87
2008 49.40 a 53.93 b 61.10 69.70 74.16 89.47 90.83 g 87.39 82.83 70.90 56.73 53.29 68.08
2009 43.39 51.32 57.19 71.59 c 77.23 84.00 87.94 ----- z 78.73 ----- z ----- z ----- z 68.92
2010 ----- z 42.36 ----- z ----- z 83.03 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 62.69
Period of Record Statistics
MEAN 45.52 48.04 56.87 67.58 76.57 84.88 88.66 87.06 80.99 70.52 59.79 49.43 67.87
S.D. 4.75 4.52 3.63 3.01 2.81 2.43 2.26 2.05 2.18 2.96 2.96 4.50 1.35
SKEW 0.32 -0.45 -0.68 0.17 0.39 -0.37 0.28 0.25 -0.04 -0.20 0.19 -0.38 0.29
MAX 58.46 57.38 63.68 74.87 83.61 89.47 94.00 91.32 85.60 77.81 65.93 58.90 70.77
MIN 35.06 35.32 44.29 61.10 70.45 77.70 83.61 83.16 76.13 62.42 53.79 36.74 65.14
NO YRS 57 60 59 59 57 57 58 58 57 58 59 58 42