VIENNA, MARYLAND

Monthly Average Minimum 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 71.30 a 67.10 57.03 53.45 38.00 a 31.07 a 52.99
1950 37.42 30.68 32.23 40.83 52.81 61.07 67.00 64.55 57.33 49.71 37.77 27.55 46.58
1951 30.48 28.61 34.71 43.00 51.03 a 61.90 67.90 65.27 a 54.85 c 51.10 34.47 31.65 46.25
1952 31.48 31.03 34.84 46.47 53.03 63.70 68.35 67.10 55.93 42.94 38.23 29.45 46.88
1953 33.77 32.61 36.52 44.80 57.13 59.67 66.19 64.55 58.23 47.87 36.67 33.39 47.62
1954 28.23 32.39 35.19 46.30 52.10 61.70 66.29 65.16 61.27 52.17 b 36.76 a 30.00 47.30
1955 28.25 c 26.71 d 36.81 46.47 53.52 58.17 70.48 69.17 a 59.13 48.55 b 36.50 26.00 46.65
1956 27.06 33.34 33.87 41.90 50.77 62.23 67.71 64.97 58.23 51.65 39.93 a 37.81 47.46
1957 25.39 33.43 35.68 47.20 55.06 66.23 65.94 63.13 a 63.53 44.71 41.67 33.32 47.94
1958 25.97 23.89 33.35 45.80 53.48 60.57 70.00 65.94 57.00 48.81 38.97 21.13 45.41
1959 25.29 28.57 34.32 46.90 57.70 a 63.59 a 68.68 69.29 61.57 53.06 38.80 33.06 48.40
1960 29.84 30.45 25.29 46.53 51.97 62.47 66.03 68.52 60.43 47.26 39.27 22.23 45.86
1961 21.61 30.89 38.19 41.77 50.81 61.60 68.61 66.58 64.20 47.06 41.53 29.19 46.84
1962 26.52 27.32 33.71 44.00 54.61 62.73 64.19 63.97 56.97 48.90 36.93 26.32 45.52
1963 23.32 21.54 37.65 43.40 51.39 61.23 66.13 63.68 54.83 46.87 41.27 25.26 44.71
1964 27.19 28.24 35.94 42.37 54.24 b 61.50 67.55 63.60 a 57.13 42.87 37.70 33.94 46.02
1965 26.26 27.29 31.87 41.33 55.16 61.77 66.84 65.48 61.23 45.68 37.30 31.29 45.96
1966 25.42 27.86 34.97 41.03 51.65 61.93 66.81 66.23 57.17 45.26 38.43 29.42 45.51
1967 32.13 24.54 33.42 42.53 48.23 60.07 67.16 66.29 55.90 46.74 35.73 31.87 45.38
1968 23.45 23.52 37.52 44.17 52.39 64.23 69.19 67.48 57.47 52.16 43.03 28.29 46.91
1969 26.55 30.11 32.77 ----- z 54.58 65.37 69.13 64.06 o 59.53 47.35 39.17 a 31.00 45.56
1970 21.55 28.71 33.87 43.40 56.00 63.93 69.00 67.74 62.93 53.48 40.97 31.61 47.77
1971 24.74 30.18 34.06 41.40 53.10 64.20 66.23 64.45 63.33 56.55 38.80 37.29 47.86
1972 31.23 27.76 35.61 41.47 53.58 61.17 68.32 65.65 59.10 46.16 36.57 36.58 46.93
1973 29.71 27.14 41.74 45.47 53.68 67.17 66.87 67.61 60.43 48.77 39.27 31.23 48.26
1974 32.00 27.71 36.43 a 45.37 52.68 58.83 64.73 a 65.10 a 55.97 40.90 a 35.87 30.00 45.47
1975 30.17 g 32.33 a 34.90 42.21 a 56.03 64.81 c 66.86 c 68.62 b 56.67 46.81 42.07 31.32 49.33
1976 25.42 35.43 a 39.93 b 45.73 54.55 64.31 a 65.52 63.74 58.00 d 45.26 32.27 d 27.17 a 46.44
1977 17.93 a 28.23 b 42.19 46.83 f 54.39 60.66 a 69.07 c 68.26 62.69 a 46.37 d 43.83 30.16 47.62
1978 25.35 20.46 33.39 44.17 51.90 62.00 65.16 69.71 57.30 46.23 42.20 31.83 a 45.81
1979 27.06 17.82 39.13 43.87 57.10 59.17 67.16 66.61 60.96 e 47.31 b 40.43 b 32.31 e 46.58
1980 27.56 f 25.10 34.58 g 47.00 g 52.65 58.44 c 66.20 f 63.72 f 61.88 d 48.43 c 37.70 28.76 b 44.71
1981 21.20 a 29.88 b 31.64 c 47.08 d 52.11 c 64.50 b 65.52 d 62.20 a 56.37 c 43.89 c 38.37 29.13 45.16
1982 20.10 30.64 35.52 41.63 55.35 61.70 67.65 61.90 58.20 48.65 41.13 37.45 46.66
1983 29.74 28.57 40.19 44.30 53.45 62.63 66.81 65.32 58.17 a 50.84 39.77 29.19 47.42
1984 23.13 35.83 31.45 44.60 54.52 64.50 64.84 66.45 56.30 56.29 36.63 37.61 47.68
1985 24.39 30.11 39.39 47.30 55.71 60.41 a 65.65 65.13 58.87 53.16 49.17 28.48 48.15
1986 26.65 30.32 35.60 a 44.00 56.13 62.37 69.65 64.90 57.77 50.84 38.53 32.87 47.47
1987 27.00 26.82 37.23 45.07 55.42 65.10 a 69.03 66.19 60.30 41.13 ----- z 33.22 d 47.86
1988 21.90 28.31 36.55 43.23 d 53.39 60.90 ----- z 69.18 c 55.20 40.77 36.13 27.90 43.04
1989 29.68 27.96 32.61 41.97 53.03 65.20 65.90 65.73 a 58.63 48.58 36.37 15.74 45.12
1990 31.03 31.65 b 35.81 43.93 b 51.42 60.87 65.55 62.77 ----- z 47.16 36.13 30.90 45.20
1991 26.32 26.30 a 35.23 41.17 54.48 59.87 63.61 62.16 53.20 43.58 36.90 32.87 44.64
1992 30.81 31.62 34.81 41.63 ----- z ----- z 70.65 64.84 60.90 44.42 40.97 32.52 45.32
1993 ----- z 25.18 30.35 42.27 54.68 62.97 70.90 67.32 61.00 46.23 36.47 27.94 47.75
1994 22.45 27.36 34.68 48.33 49.81 65.03 70.87 63.52 56.73 45.16 42.33 34.19 46.71
1995 30.97 25.07 35.97 43.30 52.16 63.10 69.39 66.13 58.63 49.55 34.10 25.97 46.19
1996 24.13 25.79 29.42 45.13 53.52 64.20 67.61 65.81 61.03 48.94 35.67 34.97 46.35
1997 28.32 34.04 38.74 42.83 50.61 60.07 67.87 63.65 59.13 48.45 39.07 31.77 47.05
1998 35.71 35.14 38.87 47.37 57.06 65.00 67.42 67.58 63.07 48.26 38.17 35.81 49.95
1999 31.07 a 30.04 a 33.14 b 44.14 a 54.45 62.13 70.80 a 67.67 a 60.26 c 48.71 n 44.77 d 34.52 d 48.45
2000 25.77 29.89 b 40.13 a 45.47 56.97 a 64.67 65.93 a 67.03 58.83 46.57 c 38.89 b 22.47 a 46.89
2001 26.77 33.29 33.30 a 43.81 c 52.19 e 64.90 64.31 b 66.66 b 58.34 a 46.70 k 41.71 b 35.14 b 47.31
2002 31.32 31.04 38.00 46.93 52.68 64.20 69.68 69.29 60.70 50.77 39.23 29.61 48.62
2003 21.91 i ----- z 38.58 45.18 b 52.45 63.23 69.97 68.35 62.96 g 49.15 d 44.57 31.39 51.43
2004 23.67 d 28.12 c 38.10 45.67 62.00 63.83 f 71.00 e 66.97 60.77 48.94 40.27 31.29 46.98
2005 28.52 29.11 32.29 42.90 49.55 64.23 69.90 68.81 60.87 51.29 40.87 29.58 47.33
2006 35.48 28.46 33.94 46.00 52.16 63.57 69.71 68.39 c 59.10 47.77 42.40 35.06 48.50
2007 33.55 22.00 b 34.21 b 41.72 a 54.55 63.83 67.23 66.59 d 60.43 55.65 38.10 32.03 47.49
2008 29.27 a 28.85 b 37.06 46.23 51.19 65.63 68.33 g 62.39 60.70 46.26 37.23 30.68 45.05
2009 23.65 29.25 32.86 b 45.69 d 55.68 62.53 65.90 ----- z 57.60 ----- z ----- z ----- z 46.65
2010 ----- z 24.14 ----- z ----- z 56.52 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 40.33
Period of Record Statistics
MEAN 27.38 28.64 35.35 44.19 53.68 62.65 67.65 66.01 58.97 48.15 39.02 30.70 46.79
S.D. 4.12 3.62 3.06 2.01 2.34 2.07 1.98 2.04 2.44 3.58 2.94 4.13 1.15
SKEW 0.19 -0.48 -0.27 0.05 0.58 -0.17 0.10 -0.14 0.06 0.22 0.69 -0.94 0.26
MAX 37.42 35.83 42.19 48.33 62.00 67.17 71.30 69.71 64.20 56.55 49.17 37.81 49.95
MIN 17.93 17.82 25.29 40.83 48.23 58.17 63.61 61.90 53.20 40.77 32.27 15.74 44.64
NO YRS 56 60 59 57 60 58 58 58 59 58 59 60 45