LEWISTON WSO AP, IDAHO

Monthly Average Maximum 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 83.20 a 77.40 63.74 46.83 34.84 61.20
1949 22.87 41.21 53.29 67.50 74.19 80.60 87.87 88.81 79.07 58.52 53.77 40.94 62.39
1950 24.61 42.14 49.16 58.93 68.81 74.97 87.71 89.74 79.80 63.06 50.23 46.61 61.32
1951 39.94 46.25 49.42 67.43 71.94 77.67 91.13 87.32 79.33 59.48 47.37 36.58 62.82
1952 35.68 45.38 51.87 67.57 71.58 75.93 89.42 87.81 81.60 70.97 44.37 41.81 63.66
1953 50.13 48.25 54.42 61.23 67.13 72.13 89.32 86.35 82.77 66.84 52.13 45.65 64.70
1954 39.65 49.11 50.81 60.53 73.16 73.37 87.55 81.06 75.73 62.52 52.73 41.77 62.33
1955 37.90 42.64 45.35 56.20 65.52 80.40 85.03 89.32 76.90 62.19 39.97 38.13 59.96
1956 39.23 35.69 51.32 66.40 72.23 75.50 90.55 85.87 78.13 59.61 43.20 43.65 61.78
1957 24.81 42.71 52.81 62.23 71.74 78.93 86.58 84.45 81.80 59.00 47.10 46.55 61.56
1958 44.26 52.07 51.13 59.33 79.16 81.20 91.39 92.68 75.63 65.97 48.43 45.03 65.52
1959 42.81 43.21 53.61 62.63 66.29 78.80 90.71 83.10 70.77 61.32 45.93 41.81 61.75
1960 33.29 44.66 53.55 61.83 67.06 81.40 95.16 81.39 79.57 63.10 48.50 37.03 62.21
1961 41.90 49.61 53.65 60.63 68.68 86.90 92.32 94.71 73.27 60.23 44.67 40.16 63.89
1962 39.97 45.11 51.39 66.47 64.45 78.93 87.32 83.65 78.63 61.00 50.03 42.77 62.48
1963 31.58 48.89 55.52 59.40 73.19 76.80 84.68 88.71 84.40 67.45 50.57 38.55 63.31
1964 43.29 46.45 51.39 58.67 69.61 76.03 86.68 82.03 73.93 64.13 45.03 38.61 61.32
1965 39.52 47.93 51.97 63.07 69.55 79.07 89.55 85.68 72.20 69.10 51.67 43.35 63.55
1966 42.84 45.75 54.55 63.30 75.48 76.93 87.65 88.32 82.57 63.06 50.63 45.74 64.74
1967 45.71 50.68 51.35 57.03 70.48 81.77 92.39 96.35 84.37 64.29 48.80 39.81 65.25
1968 41.74 50.66 57.68 60.20 70.65 78.47 92.23 82.52 74.50 60.90 48.60 37.10 62.94
1969 29.65 41.18 54.77 62.07 74.77 82.73 88.06 87.39 76.33 57.61 48.07 39.16 61.82
1970 39.81 50.21 52.29 56.53 71.94 83.23 90.68 91.84 70.40 60.77 49.57 40.45 63.14
1971 42.19 47.39 49.74 61.50 72.87 73.70 90.71 94.42 71.87 60.10 46.47 40.26 62.60
1972 39.29 45.10 56.97 57.73 74.16 79.63 88.29 90.55 73.10 62.48 48.30 36.35 62.66
1973 39.65 47.54 55.74 63.07 75.35 81.27 94.00 90.42 77.57 62.35 45.67 45.10 64.81
1974 36.35 48.96 54.45 60.67 67.84 85.93 88.35 89.00 82.20 65.77 49.93 44.16 64.47
1975 40.16 42.46 49.77 56.00 69.42 75.00 91.48 83.68 82.33 60.10 48.23 42.97 61.80
1976 43.77 45.90 50.74 61.53 73.26 75.57 88.29 82.97 83.33 66.19 50.63 41.68 63.66
1977 34.32 50.32 51.06 70.13 67.00 86.40 87.06 91.71 71.63 60.23 46.20 41.32 63.12
1978 39.68 46.14 56.84 59.17 66.06 80.93 88.97 83.55 72.70 65.65 41.80 34.45 61.33
1979 22.48 41.89 55.94 59.47 70.87 81.20 91.45 89.19 83.83 66.32 43.60 46.55 62.73
1980 35.13 46.07 51.06 66.63 69.39 74.57 88.10 83.42 77.00 63.87 48.37 46.32 62.49
1981 43.87 47.79 57.35 62.23 67.58 73.63 86.42 94.52 79.87 58.84 51.90 41.84 63.82
1982 37.97 44.43 53.03 58.27 69.58 81.87 86.81 89.23 76.87 61.23 45.90 40.29 62.12
1983 47.29 50.54 55.94 61.17 72.94 78.17 83.94 92.00 74.43 64.55 51.17 31.45 63.63
1984 43.19 49.28 56.19 59.60 68.03 76.67 91.52 89.74 74.47 58.77 48.87 36.68 62.75
1985 32.90 40.25 52.87 65.77 73.03 80.63 96.71 83.23 66.83 58.55 35.10 27.87 59.48
1986 45.71 45.57 58.13 61.60 72.03 84.80 82.58 93.00 69.77 66.61 46.27 40.26 63.86
1987 38.32 48.64 55.29 69.67 74.19 84.00 83.71 87.06 83.80 69.03 51.40 39.23 65.36
1988 38.94 50.90 53.97 64.47 71.16 78.77 89.13 89.26 78.10 71.55 49.10 40.39 64.64
1989 42.13 33.07 53.94 67.37 70.71 81.07 88.68 83.16 79.77 64.94 54.03 43.74 63.55
1990 47.19 48.29 59.13 68.03 69.32 78.83 91.97 88.58 88.00 62.32 53.50 37.84 66.08
1991 40.87 56.89 54.68 63.47 67.52 71.43 86.87 90.32 80.07 62.39 46.33 43.84 63.72
1992 44.42 49.69 60.87 64.77 77.74 84.87 85.61 88.39 75.07 64.77 46.23 38.42 65.07
1993 32.35 40.25 55.42 59.43 75.32 75.30 76.74 83.74 79.63 65.48 43.73 40.94 60.70
1994 46.97 43.32 58.48 64.30 73.48 79.83 92.84 89.77 81.43 62.45 43.87 40.00 64.73
1995 41.39 49.14 53.94 59.50 71.03 74.47 86.61 83.81 79.63 57.77 51.93 39.71 62.41
1996 39.87 42.50 a 51.87 61.40 63.97 76.47 91.10 88.71 74.17 61.55 47.40 40.29 61.61
1997 39.90 44.89 52.97 58.27 73.16 74.53 85.32 90.81 79.17 62.06 50.33 39.58 62.58
1998 43.26 50.04 54.61 61.37 69.00 77.23 93.23 92.23 82.73 60.16 49.53 40.48 64.49
1999 42.90 47.39 53.55 59.90 67.00 75.50 86.87 89.10 79.07 63.19 52.83 a 41.26 63.21
2000 41.35 47.14 53.29 66.13 69.80 a 79.50 88.35 88.87 71.90 59.10 40.63 37.77 61.99
2001 39.45 44.25 56.03 58.03 73.87 75.80 87.06 92.39 82.83 61.39 51.20 40.29 63.55
2002 42.42 47.14 48.39 60.70 68.81 79.90 92.29 84.97 77.63 59.81 49.60 43.55 62.93
2003 45.00 45.82 54.74 59.80 68.58 82.90 95.35 90.42 80.20 67.00 46.83 42.26 64.91
2004 39.65 47.52 60.45 66.73 68.65 80.97 92.81 89.52 75.57 63.48 48.57 43.87 64.81
2005 44.16 49.79 58.61 63.47 71.55 75.93 92.23 90.90 76.57 63.94 46.47 37.35 64.25
2006 48.42 46.54 54.06 62.17 74.03 80.57 95.65 89.58 79.73 62.19 50.33 41.84 65.43
2007 37.58 46.57 58.39 62.97 73.65 80.37 95.77 88.71 78.63 62.77 47.37 41.39 64.51
2008 39.71 48.97 51.42 58.73 73.10 78.90 90.35 88.55 80.00 64.29 51.30 36.48 63.48
2009 39.26 47.79 48.77 61.33 73.45 79.90 91.61 88.26 83.10 58.61 49.00 35.52 63.05
2010 46.81 50.68 56.68 62.00 65.68 74.13 89.16 87.52 77.50 63.00 45.53 41.42 63.34
2011 42.87 42.29 53.68 54.83 65.58 73.87 85.58 91.29 85.37 62.00 48.47 40.26 62.17
2012 43.84 47.03 53.16 63.83 69.39 77.13 92.58 94.00 83.87 63.00 51.70 42.65 65.18
2013 39.19 49.17 d 57.71 71.00 z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 35.00 z 48.69
Period of Record Statistics
MEAN 39.74 46.39 53.87 61.97 70.73 78.65 89.31 88.20 78.16 62.84 48.06 40.52 63.21
S.D. 5.81 3.87 3.06 3.49 3.26 3.60 3.56 3.67 4.37 3.12 3.53 3.57 1.41
SKEW -1.20 -0.73 -0.01 0.35 0.08 0.23 -0.46 -0.10 -0.26 0.61 -0.94 -0.74 -0.14
MAX 50.13 56.89 60.87 70.13 79.16 86.90 96.71 96.35 88.00 71.55 54.03 46.61 66.08
MIN 22.48 33.07 45.35 54.83 63.97 71.43 76.74 81.06 66.83 57.61 35.10 27.87 59.48
NO YRS 65 65 65 64 64 64 64 65 65 65 65 65 64