LEWISTON WSO AP, IDAHO

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(105241)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1948 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 54.35 47.63 38.74 32.37 22.19 39.06
1949 5.71 25.93 34.74 40.50 49.29 51.80 57.19 57.39 50.07 35.06 36.63 28.29 39.38
1950 8.29 27.25 33.74 36.67 42.97 52.87 57.19 57.00 48.77 43.26 35.13 35.39 39.88
1951 26.42 28.11 29.97 36.17 43.71 48.47 57.45 55.23 47.87 39.48 31.17 23.00 38.92
1952 22.10 29.55 31.84 39.73 47.13 51.30 56.77 56.19 49.73 41.00 26.37 30.58 40.19
1953 38.13 31.18 33.58 38.90 42.35 47.67 56.23 56.81 49.70 39.74 35.53 31.94 41.81
1954 25.45 33.25 29.19 38.13 45.06 48.20 55.65 52.35 46.43 35.19 34.80 24.23 39.00
1955 25.03 24.68 25.23 33.87 41.13 52.90 55.87 53.71 46.93 41.39 27.43 25.52 37.81
1956 26.48 20.24 32.81 40.27 47.90 49.87 57.48 53.94 47.50 39.58 30.53 28.77 39.61
1957 11.81 28.18 34.71 38.83 49.61 52.43 56.32 54.77 50.03 42.00 30.40 32.61 40.14
1958 30.39 37.36 31.26 38.43 50.06 55.97 59.61 59.97 49.10 40.26 33.70 33.00 43.26
1959 28.48 30.00 33.81 38.83 42.48 51.93 57.26 53.32 48.17 39.94 26.20 27.81 39.85
1960 19.65 28.07 33.90 39.27 42.77 51.10 60.16 54.26 48.30 40.03 32.50 26.23 39.69
1961 29.52 35.32 35.52 38.73 44.90 55.87 60.94 62.13 46.10 38.74 27.30 27.81 41.91
1962 24.19 29.79 31.52 40.53 44.94 50.73 56.97 55.87 49.70 42.00 36.37 30.71 41.11
1963 16.74 32.43 34.74 38.80 46.74 54.70 55.90 58.58 55.13 44.71 35.13 29.29 41.91
1964 30.26 27.24 32.13 36.60 45.16 52.70 58.68 55.23 47.47 40.45 32.90 24.32 40.26
1965 28.68 31.29 28.06 41.00 43.74 51.33 58.77 58.68 46.13 43.39 36.90 29.52 41.46
1966 29.42 29.93 32.87 38.10 46.84 51.53 57.94 57.39 54.57 40.68 35.80 33.94 42.42
1967 33.68 31.89 32.81 36.00 45.97 55.07 60.10 61.84 54.60 42.52 32.93 27.19 42.88
1968 27.87 35.52 37.03 36.53 46.52 54.20 60.58 57.13 51.23 39.94 35.03 25.03 42.22
1969 17.61 28.21 31.68 39.27 48.03 56.60 57.52 56.29 52.23 38.10 33.53 30.71 40.82
1970 28.94 33.68 33.26 35.93 46.58 57.03 61.39 58.19 45.90 38.97 33.30 27.55 41.73
1971 30.26 30.64 31.94 37.63 47.94 50.93 58.45 61.71 45.20 37.48 32.97 28.00 41.10
1972 25.16 29.97 37.00 36.37 47.77 54.43 58.13 59.58 47.60 39.94 34.20 21.48 40.97
1973 24.84 30.61 35.68 37.77 46.81 53.97 60.10 59.13 51.80 40.23 33.93 33.58 42.37
1974 21.87 33.54 34.10 41.47 44.84 56.40 59.48 58.32 50.27 40.39 36.13 30.45 42.27
1975 28.32 28.07 32.23 36.97 46.16 52.20 64.00 57.10 49.97 42.68 32.27 30.84 41.73
1976 30.23 30.03 31.03 38.67 46.13 50.33 59.48 56.97 54.63 42.32 36.33 29.45 42.13
1977 23.23 32.64 33.19 41.73 45.97 58.13 59.16 63.03 51.03 41.19 32.63 32.16 42.84
1978 31.03 35.32 38.42 40.80 45.90 53.40 59.16 58.61 51.03 38.68 28.37 23.45 42.01
1979 11.23 30.00 36.00 40.17 47.42 53.03 60.55 60.71 54.07 45.48 31.30 32.97 41.91
1980 22.03 33.14 35.06 45.30 47.00 51.70 58.94 54.13 50.93 40.35 34.80 34.35 42.31
1981 33.03 31.64 35.68 41.00 46.32 50.70 55.39 60.90 51.13 40.23 36.40 31.55 42.83
1982 26.20 a 29.11 35.45 37.07 44.81 56.40 58.52 59.45 50.87 41.58 31.70 29.32 41.71
1983 33.65 35.32 38.16 37.17 45.97 52.07 57.13 61.29 47.00 41.48 36.40 19.10 42.06
1984 28.77 32.21 37.42 38.90 44.13 50.97 58.90 60.16 48.43 38.26 35.43 24.16 41.48
1985 23.00 24.86 31.65 41.13 47.48 53.17 63.16 55.71 46.77 38.74 22.77 18.55 38.92
1986 32.58 32.36 39.45 39.33 48.16 57.00 55.16 62.32 49.00 41.16 34.57 29.10 43.35
1987 25.71 32.18 37.45 44.27 50.39 55.90 59.16 56.87 52.70 40.13 35.73 28.32 43.23
1988 27.68 31.72 34.74 42.37 46.48 54.60 58.52 58.42 50.27 45.90 35.97 27.90 42.88
1989 30.35 20.04 38.65 44.80 47.97 56.07 60.26 59.55 52.30 43.81 40.10 31.97 43.82
1990 36.52 30.96 37.61 46.03 48.26 56.27 62.81 62.61 57.90 43.84 40.63 23.29 45.56
1991 28.10 38.50 36.10 40.53 44.19 49.13 57.68 59.84 51.00 38.81 33.87 31.35 42.42
1992 31.39 34.55 37.32 42.77 48.29 57.50 59.23 58.26 49.60 43.45 34.13 27.00 43.62
1993 21.58 25.39 37.42 40.83 50.52 52.47 54.10 56.71 49.70 43.19 26.57 31.16 40.80
1994 33.84 27.89 34.74 44.00 49.58 52.17 62.68 60.52 53.40 41.74 32.90 29.13 43.55
1995 28.71 34.71 35.00 40.23 48.61 52.97 60.13 56.06 52.93 40.90 38.27 29.61 43.18
1996 28.35 26.07 a 34.90 41.27 44.23 51.60 58.52 58.06 49.33 41.29 33.57 28.19 41.28
1997 27.48 31.68 36.10 39.23 49.81 53.83 58.03 61.58 53.70 41.81 35.87 28.58 43.14
1998 30.55 34.00 36.52 40.47 48.74 53.77 64.13 60.55 55.80 39.68 37.53 28.42 44.18
1999 32.23 33.68 33.84 37.40 43.52 52.13 56.84 61.52 49.03 40.84 38.67 33.42 42.76
2000 30.68 34.14 35.10 42.60 47.06 52.47 58.84 58.26 50.27 40.16 27.53 27.94 42.09
2001 28.90 29.54 34.16 38.73 46.45 50.87 60.06 60.58 53.40 42.06 37.07 29.39 42.60
2002 31.42 30.64 33.13 38.87 44.68 54.00 61.84 55.94 50.70 35.58 33.57 32.74 41.92
2003 34.58 30.11 37.55 39.90 46.23 53.63 62.29 60.87 52.77 43.77 30.53 30.94 43.60
2004 28.35 33.00 37.81 41.30 48.45 54.73 62.29 62.00 51.40 43.23 35.23 31.84 44.14
2005 31.71 28.50 37.10 41.30 49.58 52.93 61.00 59.42 49.40 43.74 34.17 26.32 42.93
2006 35.97 28.43 35.29 41.73 48.52 56.53 63.00 58.29 51.07 39.16 35.30 29.32 43.55
2007 24.58 32.75 38.77 40.20 47.26 54.20 64.77 58.32 50.40 41.81 32.30 30.81 43.01
2008 26.23 33.55 32.90 35.43 48.94 52.07 59.58 59.74 51.03 40.97 37.47 24.29 41.85
2009 28.55 31.39 32.52 39.37 46.90 54.27 61.06 61.23 53.20 38.45 33.80 23.00 41.98
2010 35.16 34.50 35.10 40.00 44.00 52.90 58.16 58.74 52.77 44.16 31.50 29.71 43.06
2011 30.74 27.89 36.10 36.57 44.71 51.87 56.06 59.71 53.47 44.45 32.33 26.29 41.68
2012 28.90 31.52 35.19 42.30 45.90 53.90 62.58 60.74 52.80 42.84 39.70 33.61 44.17
2013 27.74 33.67 d 37.32 41.00 z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 25.00 z 32.91
Period of Record Statistics
MEAN 27.17 30.76 34.54 39.61 46.50 53.15 59.15 58.37 50.51 40.94 33.64 28.60 41.93
S.D. 6.33 3.54 2.72 2.49 2.17 2.35 2.41 2.61 2.69 2.29 3.53 3.71 1.51
SKEW -1.36 -0.67 -0.73 0.31 -0.23 -0.02 0.31 -0.27 0.24 -0.26 -0.72 -0.60 -0.46
MAX 38.13 38.50 39.45 46.03 50.52 58.13 64.77 63.03 57.90 45.90 40.63 35.39 45.56
MIN 5.71 20.04 25.23 33.87 41.13 47.67 54.10 52.35 45.20 35.06 22.77 18.55 37.81
NO YRS 65 65 65 64 64 64 64 65 65 65 65 65 64