MC NARY DAM, WASHINGTON

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(455231)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 200810
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
1954 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 40.96 f 39.50 29.16 34.33
1955 30.77 30.36 32.16 39.03 47.39 56.77 60.45 60.19 54.63 46.03 30.07 28.84 43.06
1956 29.81 22.83 36.90 43.67 52.26 54.23 63.77 61.39 53.57 44.23 33.23 31.71 43.97
1957 12.26 29.43 37.58 43.47 53.06 57.27 60.61 59.35 55.33 44.26 33.90 35.06 43.47
1958 33.90 39.64 35.19 42.57 52.35 58.97 65.97 65.65 53.73 42.61 37.27 33.16 46.75
1959 29.87 33.68 37.03 41.27 46.23 55.73 61.42 59.19 53.77 44.52 29.07 29.58 43.45
1960 20.35 30.62 35.32 42.63 47.52 55.53 63.10 58.84 52.23 44.03 36.03 28.26 42.87
1961 31.39 38.18 39.55 42.73 48.39 57.57 64.87 65.97 51.57 41.94 29.77 31.42 45.28
1962 24.58 30.57 33.81 43.48 a 45.55 52.17 57.68 56.39 49.63 43.58 37.67 33.52 42.38
1963 20.26 31.93 34.94 40.70 49.00 53.97 57.39 59.10 53.68 b 44.55 37.93 28.35 42.65
1964 32.61 30.31 34.16 41.13 46.65 55.53 60.84 57.10 51.03 41.55 36.10 26.68 42.81
1965 32.13 34.75 32.90 45.23 48.35 54.93 61.45 62.68 49.73 45.06 39.10 30.35 44.72
1966 32.29 31.96 35.52 42.79 a 49.65 55.27 58.65 61.61 56.13 42.65 37.77 35.00 44.94
1967 37.03 34.29 35.61 39.63 49.90 58.40 63.61 65.48 57.47 45.42 35.90 29.32 46.01
1968 29.42 34.41 38.77 41.23 50.58 57.07 63.48 60.45 54.57 42.23 38.30 28.48 44.92
1969 19.23 a 30.07 34.65 42.10 50.97 59.40 60.68 58.58 55.07 41.68 37.13 33.16 43.56
1970 28.77 34.75 35.71 38.30 48.23 57.87 63.42 59.81 48.17 40.77 35.80 29.26 43.40
1971 33.65 32.29 33.84 39.53 49.13 53.63 61.26 64.65 49.47 42.10 36.27 31.71 43.96
1972 27.06 30.00 37.65 37.30 49.26 56.03 61.03 62.10 50.57 42.42 37.97 21.84 42.77
1973 23.81 30.36 37.29 40.60 49.27 a 55.03 61.74 60.55 52.93 44.58 37.60 35.87 44.14
1974 23.94 34.64 35.77 42.43 47.16 54.70 59.60 a 60.58 52.47 41.35 37.23 34.16 43.67
1975 29.94 28.89 33.45 37.07 45.77 a 53.30 62.29 57.81 51.80 45.10 33.77 32.97 42.68
1976 31.84 29.97 32.13 40.13 46.65 50.93 59.71 58.74 54.33 41.32 35.57 27.84 42.43
1977 23.52 33.00 35.58 41.77 45.65 57.53 59.19 64.16 51.10 42.06 33.50 32.61 43.31
1978 29.23 34.18 37.35 42.20 45.74 55.50 60.39 59.58 51.33 40.71 27.66 a 27.06 42.58
1979 13.29 27.68 35.39 42.10 49.19 53.37 60.61 61.45 53.77 46.65 33.20 33.13 42.49
1980 21.48 30.72 35.45 42.20 48.42 53.18 b 59.42 58.42 53.17 41.58 38.28 a 32.36 c 42.89
1981 35.38 b 31.50 35.58 40.41 a 47.23 51.90 57.10 a 61.32 f 51.52 a 40.29 c 35.80 e 31.57 a 41.66
1982 28.00 28.32 33.90 36.27 44.90 55.23 59.23 60.06 52.13 41.87 32.77 31.48 42.01
1983 33.29 35.39 40.45 39.70 49.35 53.17 57.45 61.81 49.73 42.03 40.33 20.39 43.59
1984 27.19 33.21 38.48 40.67 45.42 52.23 59.06 59.97 50.43 41.29 36.57 25.23 42.48
1985 26.74 22.89 32.90 43.23 d 48.65 55.03 64.19 57.90 49.90 44.39 24.43 19.45 40.81
1986 29.39 32.43 38.23 39.40 47.63 a 57.17 57.52 63.68 51.53 43.77 38.40 30.84 44.17
1987 28.16 33.00 37.74 43.37 50.90 55.23 60.10 58.81 54.23 42.16 37.03 31.00 44.31
1988 28.74 30.62 36.23 43.43 47.32 54.97 60.32 58.42 51.90 47.81 40.20 31.00 44.25
1989 32.42 18.79 34.58 44.17 47.90 56.30 59.61 59.26 51.97 44.00 39.87 31.13 43.33
1990 34.84 30.25 35.23 44.53 47.71 55.20 62.87 63.13 57.03 43.55 38.97 20.90 44.52
1991 24.97 34.11 34.39 41.53 47.61 51.73 61.26 63.39 54.10 42.84 37.97 34.61 44.04
1992 33.74 36.03 38.42 44.30 49.16 59.50 60.84 60.26 51.40 44.87 37.53 28.84 45.41
1993 19.48 25.07 32.90 42.43 51.68 53.97 56.61 58.19 51.43 44.84 26.47 33.06 41.35
1994 33.97 28.93 34.97 45.00 50.74 53.03 63.26 61.16 55.00 43.61 34.27 31.35 44.61
1995 28.03 33.46 34.87 40.83 49.29 54.80 61.42 56.45 55.23 42.90 39.63 32.03 44.08
1996 28.74 24.90 35.23 42.30 45.52 52.63 60.35 58.77 51.30 44.32 34.30 28.48 42.24
1997 27.90 31.96 36.52 40.43 49.32 53.97 59.48 62.10 54.10 43.35 37.63 31.94 44.06
1998 30.58 35.18 37.26 41.03 49.32 55.13 65.71 62.00 58.07 41.84 40.80 29.94 45.57
1999 33.90 34.79 36.00 38.37 45.03 53.17 57.65 62.84 49.97 42.13 40.07 34.94 44.07
2000 32.13 32.59 36.07 a 42.90 49.00 54.66 a 59.80 a 60.10 51.93 43.94 31.63 29.19 43.66
2001 31.23 29.96 35.81 40.80 48.10 53.07 61.97 61.81 55.43 44.23 37.57 33.10 44.42
2002 32.52 31.11 33.90 41.40 46.74 56.07 61.87 59.19 53.20 40.77 33.90 35.26 43.83
2003 36.61 31.93 39.97 42.80 ----- z 56.50 63.74 62.55 55.53 47.35 31.90 32.58 45.59
2004 25.55 32.04 e 38.52 43.17 49.48 56.27 63.48 64.29 53.27 46.29 34.53 32.10 44.92
2005 28.77 27.14 37.90 42.60 50.48 54.43 ----- z ----- z 52.73 ----- z 35.73 26.52 39.59
2006 35.39 ----- z 36.29 42.03 ----- z 56.07 63.16 ----- z 52.30 43.10 35.90 28.65 43.65
2007 25.81 32.14 37.23 41.27 47.61 54.00 64.03 58.94 52.50 43.00 34.57 32.45 43.63
2008 26.42 33.41 34.00 37.17 48.29 51.73 59.90 59.39 50.83 41.65 ----- z ----- z 44.28
Period of Record Statistics
MEAN 28.56 31.33 35.88 41.50 48.40 55.02 61.03 60.67 52.78 43.30 35.64 30.35 43.68
S.D. 5.39 3.75 1.96 2.05 1.96 2.01 2.28 2.37 2.17 1.75 3.60 3.70 1.17
SKEW -0.99 -0.91 0.23 -0.59 0.23 0.23 0.12 0.44 0.30 0.50 -1.10 -1.18 0.11
MAX 37.03 39.64 40.45 45.23 53.06 59.50 65.97 65.97 58.07 47.81 40.80 35.87 46.75
MIN 12.26 18.79 32.13 36.27 44.90 50.93 56.61 56.39 48.17 40.29 24.43 19.45 40.81
NO YRS 54 53 54 54 52 54 53 51 54 53 54 54 49