ICE HARBOR DAM, WASHINGTON

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(453883)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201301
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
1957 ----- z ----- z 36.20 u 41.74 c 52.71 57.43 56.90 57.03 52.53 41.72 b 29.33 33.71 47.01
1958 30.94 37.43 32.55 41.07 52.65 59.33 63.16 63.55 51.30 39.26 32.40 30.29 44.49
1959 26.23 29.57 35.00 40.20 43.74 54.93 59.16 56.35 50.03 40.94 26.23 26.16 40.71
1960 16.77 28.79 33.77 41.47 46.29 53.70 63.74 58.23 50.40 44.52 34.43 26.29 41.53
1961 29.90 38.22 a 38.61 42.17 48.65 58.77 63.45 62.29 47.17 39.45 25.13 28.42 43.52
1962 22.65 28.89 32.53 a 43.38 a 47.55 53.40 59.65 59.10 51.80 44.39 37.13 32.45 42.74
1963 18.87 30.54 34.87 41.17 48.10 54.13 58.84 60.16 55.60 44.94 37.47 27.81 42.71
1964 31.23 28.10 32.42 39.03 46.29 53.80 59.94 55.55 49.13 39.00 35.40 24.26 41.18
1965 30.58 32.32 30.48 43.93 47.16 54.40 60.71 61.35 48.70 44.45 39.03 28.61 43.48
1966 30.39 29.43 34.71 41.03 48.94 54.40 59.32 59.97 56.53 43.16 36.60 33.65 44.01
1967 35.48 33.39 34.26 38.63 47.74 56.03 62.58 63.29 57.33 43.97 32.87 28.68 44.52
1968 28.81 32.34 37.10 38.90 48.81 55.67 62.71 60.39 53.40 41.00 35.20 25.97 43.36
1969 16.74 26.54 33.06 41.77 49.10 57.97 57.97 56.03 52.00 39.52 34.40 31.74 41.40
1970 28.10 34.54 33.68 37.97 46.81 55.33 61.35 57.35 47.77 38.65 32.63 27.90 41.84
1971 30.45 30.00 32.00 39.03 46.97 52.17 58.90 63.35 47.00 39.65 34.70 29.23 41.95
1972 26.97 29.21 37.61 34.60 47.13 53.50 58.87 ----- z 48.83 40.26 34.27 21.87 39.37
1973 22.42 29.36 36.23 38.80 45.97 53.50 58.58 58.77 51.03 43.23 35.73 34.74 42.36
1974 22.35 34.36 35.87 41.40 45.58 53.83 57.71 58.90 50.30 39.16 38.77 34.13 42.70
1975 29.32 27.89 33.19 36.47 45.19 50.97 61.16 56.58 47.40 44.16 33.07 30.48 41.32
1976 30.52 30.59 31.10 37.70 45.19 48.83 57.48 56.77 51.47 38.68 31.53 25.77 40.47
1977 23.35 32.39 35.23 42.27 43.87 54.60 56.74 60.61 48.90 37.58 30.90 30.71 41.43
1978 26.00 31.61 34.32 40.43 43.52 51.67 55.87 57.80 a 50.03 36.65 26.47 23.39 39.81
1979 11.74 d 27.50 31.97 39.43 ----- z 51.93 ----- z 59.48 50.43 45.16 32.07 a 33.07 a 38.28
1980 ----- z ----- z 33.13 40.37 47.45 51.67 58.90 56.52 52.60 40.33 a 37.83 32.61 45.14
1981 33.94 31.96 34.77 40.13 47.19 51.73 56.94 58.87 49.62 a 38.66 b 34.27 28.97 42.25
1982 24.00 29.43 32.58 36.23 45.42 53.97 58.71 59.77 51.13 41.00 31.80 29.68 41.14
1983 33.06 34.89 39.16 39.33 48.04 c 53.50 56.71 61.58 46.00 39.39 39.27 18.77 42.48
1984 26.90 31.28 37.35 40.27 ----- z 51.30 57.77 58.39 47.67 38.13 33.43 20.23 40.25
1985 23.42 22.82 31.94 41.47 48.29 53.43 62.45 ----- z 47.30 40.13 ----- z 18.07 a 38.93
1986 28.03 30.64 38.52 38.87 47.35 56.83 55.57 a 59.52 49.43 40.77 37.10 29.16 42.65
1987 25.00 30.50 36.77 43.67 50.74 54.93 59.71 57.77 53.00 38.06 35.83 28.39 42.87
1988 26.68 28.52 35.06 41.50 47.23 54.77 58.61 56.94 48.87 44.48 38.63 27.81 42.42
1989 31.29 19.11 33.90 42.13 47.42 56.43 58.97 58.81 49.43 41.39 37.40 30.52 42.23
1990 33.29 28.32 34.43 j 43.73 47.65 55.07 61.32 61.32 54.63 41.68 38.10 18.94 44.00
1991 22.52 33.50 32.84 40.33 47.10 51.60 60.45 62.26 ----- z 40.00 36.37 33.87 41.89
1992 32.97 35.72 ----- z 44.10 48.26 58.93 60.97 59.42 49.13 40.81 36.43 26.48 44.84
1993 18.32 23.07 31.45 k 42.37 51.87 ----- z 57.29 56.87 50.73 44.16 27.77 32.74 40.52
1994 33.58 28.96 34.97 45.27 ----- z 54.00 62.58 63.26 53.70 42.52 34.10 30.35 43.94
1995 28.13 33.43 33.81 40.73 48.58 53.93 60.90 55.81 52.67 41.42 37.90 30.71 43.17
1996 26.29 22.62 34.61 42.47 45.65 52.17 59.77 56.00 49.73 41.42 33.80 25.19 40.81
1997 27.19 31.54 37.06 39.37 49.13 54.27 58.45 60.84 51.77 41.94 35.77 31.55 43.24
1998 29.39 34.00 36.81 40.60 49.81 54.77 64.90 59.55 56.40 39.29 40.70 27.58 44.48
1999 33.87 34.39 34.68 36.27 43.84 53.23 56.03 58.45 46.67 38.35 38.87 35.32 42.50
2000 30.81 31.10 36.16 42.50 48.26 51.31 a 59.32 58.52 50.47 41.13 29.33 28.48 42.28
2001 29.68 27.93 34.52 40.20 47.48 51.60 60.86 b 60.67 a 51.40 40.42 36.83 a 31.93 c 42.79
2002 31.29 28.18 33.23 40.43 43.87 55.10 61.03 56.65 49.93 37.84 34.20 34.74 42.21
2003 35.26 30.36 40.55 42.67 47.35 55.37 61.94 60.55 52.27 46.06 29.83 31.55 44.48
2004 26.10 31.38 36.58 42.57 50.42 55.57 62.65 62.48 51.87 44.61 33.63 31.84 44.14
2005 26.84 24.36 37.19 ----- z 51.48 54.17 60.61 59.35 50.37 45.52 35.50 25.06 42.77
2006 35.86 i 26.07 35.16 41.30 48.10 56.33 63.16 58.32 52.00 41.52 36.07 27.39 44.13
2007 24.71 31.93 36.84 40.57 48.29 54.33 64.55 57.68 49.17 41.35 33.90 31.23 42.88
2008 23.61 32.93 34.32 35.90 48.58 52.83 61.23 58.03 48.80 38.87 37.13 22.35 41.22
2009 27.87 28.39 32.84 40.00 46.94 56.17 60.97 61.06 50.60 39.48 34.80 21.32 41.70
2010 32.81 32.89 34.71 39.27 45.81 53.90 59.10 58.13 53.10 44.16 33.77 29.97 43.13
2011 29.35 26.92 b 35.65 37.21 b 45.89 c 52.55 a 55.45 60.23 51.39 b 45.31 b 31.97 26.39 41.53
2012 26.90 31.56 b 35.48 41.77 46.27 a 52.52 a 61.29 58.39 ----- z 41.87 ----- z ----- z 44.00
2013 27.45 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 27.45
Period of Record Statistics
MEAN 27.41 30.22 34.84 40.48 47.50 54.16 59.89 59.17 50.76 41.28 34.41 28.52 42.43
S.D. 4.98 3.68 2.14 2.24 2.13 2.12 2.35 2.14 2.52 2.42 3.46 4.30 1.16
SKEW -0.84 -0.53 0.37 -0.43 0.38 0.31 0.08 0.33 0.54 0.27 -0.74 -0.67 0.05
MAX 35.48 38.22 40.55 45.27 52.71 59.33 64.90 63.55 57.33 46.06 40.70 35.32 44.52
MIN 11.74 19.11 30.48 34.60 43.52 48.83 55.45 55.55 46.00 36.65 25.13 18.07 39.81
NO YRS 54 54 52 55 53 55 55 54 54 56 54 55 42