SWAN FALLS POWER HOUSE, IDAHO

Monthly Average Temperature (Degrees Fahrenheit)

(108928)

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
1935 ----- z ----- z ----- z ----- z ----- z ----- z 79.25 a 76.86 c 70.53 55.35 35.08 28.97 57.67
1936 34.13 35.67 n 42.79 e 55.20 66.98 a 72.98 82.86 c 79.55 b 65.71 b 57.62 a 39.05 a 35.44 57.48
1937 15.92 a 32.61 a 46.35 a 49.75 63.95 69.05 82.44 76.79 69.67 57.06 46.98 39.03 a 54.13
1938 37.32 c 42.68 c 43.12 a 53.30 59.30 d 70.25 b 79.22 b 76.52 a 72.31 a 55.82 a 37.40 35.35 55.22
1939 35.47 34.11 46.39 56.68 64.95 66.95 80.42 79.76 67.65 55.32 43.40 39.50 55.88
1940 34.44 41.29 48.37 53.45 65.58 76.12 81.37 a 80.05 67.20 56.79 38.60 36.76 56.67
1941 35.23 41.43 a 48.38 a 52.95 62.47 67.33 80.75 a 75.60 63.18 54.31 43.75 b 38.31 55.31
1942 24.02 34.50 42.17 a 55.25 56.92 64.87 81.17 a 77.68 67.87 56.94 42.50 36.11 53.33
1943 33.23 38.23 42.42 57.65 58.86 b 64.60 76.73 a 76.02 70.17 56.40 41.83 33.92 54.17
1944 27.27 37.24 41.77 51.42 62.73 63.36 a 76.48 75.60 67.12 59.89 40.53 31.02 a 52.87
1945 34.63 d 39.31 a 42.55 a 49.03 60.50 65.31 a 79.83 a 77.60 a 63.47 58.45 43.37 34.18 54.02
1946 34.53 37.00 47.02 56.70 c 63.25 c 70.62 80.34 77.34 64.20 49.23 40.53 39.40 55.01
1947 26.68 a 40.64 48.50 54.03 66.60 65.62 80.98 76.58 66.13 57.28 a 41.15 35.34 54.96
1948 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 75.06 65.88 56.21 40.78 29.21 b 53.43
1949 14.47 34.02 46.39 c 58.02 a 65.55 b 70.55 80.06 78.26 69.97 50.52 47.23 35.37 54.20
1950 28.63 38.80 43.94 52.87 59.97 a 68.93 79.39 77.82 67.95 59.92 45.30 38.63 55.18
1951 33.08 39.67 a 42.08 55.70 61.97 68.58 81.52 76.97 68.45 53.85 41.93 32.44 54.69
1952 27.89 33.28 40.58 57.35 63.27 69.65 79.40 79.47 70.53 60.82 38.53 36.68 54.79
1953 44.69 41.75 48.06 52.12 57.87 65.58 81.66 78.15 a 71.35 58.52 49.19 a 34.48 56.95
1954 39.87 43.25 44.13 56.42 66.19 66.37 81.27 a 73.92 67.86 b 55.34 46.61 b 33.50 56.23
1955 28.35 32.79 41.45 49.71 b 60.88 b 71.84 a 77.26 80.93 d 69.48 b 57.67 b 39.72 38.94 54.09
1956 36.35 31.14 46.92 g 56.07 64.53 b 70.83 80.42 75.85 69.18 54.42 39.32 33.34 c 55.59
1957 26.11 38.75 47.55 b 53.02 a 62.69 72.22 a 79.79 76.85 70.33 53.90 40.50 38.00 54.98
1958 35.23 45.27 44.89 52.08 69.77 71.67 79.50 81.27 68.15 59.34 43.07 39.03 57.44
1959 39.11 40.43 46.03 57.12 58.58 75.17 82.47 76.85 64.62 56.05 41.72 33.10 55.94
1960 27.66 36.41 47.61 55.38 61.13 75.08 85.18 75.00 71.37 55.18 43.72 33.13 55.57
1961 34.52 43.98 47.69 53.80 64.18 78.67 82.79 82.27 62.77 54.42 a 41.33 33.81 56.69
1962 24.55 34.73 43.10 58.72 60.82 70.90 77.68 76.34 69.50 56.23 45.52 37.79 54.66
1963 27.60 45.96 47.66 51.38 65.11 68.07 77.69 78.44 72.45 60.44 44.58 31.08 55.87
1964 31.06 34.00 41.74 51.97 a 61.71 67.67 81.03 75.81 65.73 58.08 42.20 38.16 54.10
1965 35.81 41.59 43.94 55.78 60.45 69.87 78.29 74.68 62.13 59.44 47.42 34.21 55.30
1966 37.42 38.00 47.74 55.37 67.19 70.23 79.81 78.35 71.78 54.87 46.35 35.37 56.87
1967 39.92 42.89 46.92 48.72 62.77 70.20 83.63 82.55 73.12 a 55.77 44.80 32.00 56.94
1968 33.05 44.47 50.40 52.45 62.61 72.85 81.66 72.34 67.17 55.87 42.92 36.21 56.00
1969 35.50 37.12 44.89 56.22 67.44 71.07 79.98 79.39 69.32 50.95 42.93 36.84 55.97
1970 38.61 43.70 45.39 48.67 62.52 72.58 80.29 g 80.61 62.85 51.92 45.20 35.47 53.41
1971 36.79 41.55 43.87 53.05 63.92 68.95 79.24 82.58 63.35 53.23 41.93 33.32 55.15
1972 33.10 38.69 49.03 52.12 64.32 72.05 78.39 78.76 62.70 55.34 42.10 26.45 54.42
1973 32.55 40.66 46.52 53.47 a 65.85 72.52 80.77 78.29 66.37 56.19 43.88 39.21 56.36
1974 32.29 40.17 a 45.63 53.55 61.34 76.72 a 78.81 77.21 70.65 d 56.21 44.98 f 35.74 57.12
1975 31.11 39.38 45.19 47.77 60.81 69.15 82.40 74.82 69.42 56.34 42.27 35.45 54.51
1976 35.05 38.09 41.74 52.93 66.23 69.52 80.39 72.53 68.25 55.42 44.22 32.44 54.73
1977 24.08 38.16 45.00 59.97 59.10 76.20 78.63 78.42 66.80 55.84 42.50 38.62 a 55.28
1978 39.42 41.05 51.94 53.02 d 59.94 70.92 78.55 77.08 66.27 57.61 39.60 30.23 55.47
1979 21.08 37.05 48.15 53.27 64.24 73.30 80.95 77.00 71.75 58.42 38.37 39.17 j 56.69
1980 33.00 41.69 46.32 58.27 61.92 67.97 79.19 75.02 67.03 55.68 41.82 34.50 55.20
1981 35.42 39.98 48.16 54.73 60.32 69.57 78.66 80.79 69.63 52.66 46.83 38.18 56.25
1982 29.60 34.46 45.48 50.07 61.63 71.75 75.44 78.13 ----- z 54.55 38.90 34.81 52.26
1983 36.29 43.57 48.32 50.37 61.61 69.78 75.87 79.44 67.22 56.29 45.72 28.92 55.28
1984 27.24 33.78 46.42 51.78 60.16 65.43 80.11 80.48 64.80 51.24 42.67 26.93 c 52.59
1985 24.97 30.73 41.52 58.83 65.50 75.02 i 84.69 75.77 61.55 53.15 32.70 17.50 49.72
1986 34.08 44.46 52.60 53.62 63.65 77.53 76.37 81.65 62.77 56.19 44.54 c 31.50 56.58
1987 30.82 40.18 48.31 ----- z 67.61 74.95 76.10 75.94 69.23 58.48 43.28 34.11 56.27
1988 29.66 40.19 48.47 57.82 62.90 74.95 80.63 74.56 66.18 64.21 44.28 31.26 56.26
1989 29.48 28.41 47.95 58.45 62.21 74.43 82.23 75.10 68.60 55.21 42.33 33.31 54.81
1990 37.08 38.21 49.47 60.48 60.45 71.53 80.45 77.65 73.40 55.60 43.17 21.06 55.71
1991 26.71 44.18 47.97 52.75 59.66 68.37 80.76 81.11 69.22 55.40 38.88 33.89 54.91
1992 35.40 44.17 51.66 58.78 68.55 a 72.62 74.31 79.77 68.02 58.79 38.93 31.37 56.86
1993 28.10 33.16 45.05 52.83 67.00 66.92 70.08 72.90 68.22 56.66 35.77 35.61 52.69
1994 35.11 37.12 51.34 56.55 66.18 73.20 82.31 80.44 70.83 54.92 37.02 31.69 56.39
1995 37.58 44.38 47.24 53.13 61.37 67.98 78.23 74.81 69.47 52.76 l 46.93 34.60 55.97
1996 35.42 37.29 47.13 52.77 59.26 70.60 79.53 76.24 64.43 55.08 43.92 37.63 54.94
1997 35.10 39.64 ----- z 51.65 65.02 69.37 76.42 77.81 69.66 a 54.40 43.77 32.85 55.97
1998 40.63 41.50 46.85 52.22 59.55 ----- z ----- z 79.74 71.70 54.87 45.38 33.05 52.55
1999 36.98 39.07 45.19 50.80 58.41 b 69.35 76.62 a 77.82 66.48 56.19 b 48.17 33.55 54.89
2000 35.92 43.17 46.61 58.05 63.05 72.35 79.14 b 78.62 a 64.81 c ----- z 53.37 33.84 b 57.18
2001 31.45 37.07 49.69 51.43 65.97 a 71.90 d 77.32 c 80.85 70.96 c 55.47 b 46.05 34.21 56.03
2002 35.35 36.88 43.71 54.98 63.10 73.62 a 82.61 74.52 f 67.32 52.52 a 42.55 38.79 53.77
2003 39.11 39.62 49.55 52.92 63.29 73.35 83.61 79.53 68.10 60.02 39.90 39.42 57.37
2004 32.45 37.38 51.97 56.57 61.87 71.62 80.32 77.58 a 65.57 55.76 39.67 a 37.05 55.65
2005 34.10 39.70 49.13 53.03 61.95 66.55 80.08 79.12 c 64.68 55.42 39.83 31.37 54.58
2006 38.90 37.12 44.87 54.55 63.32 73.95 83.56 76.13 66.17 53.81 44.02 34.32 55.89
2007 31.98 41.89 ----- z 53.38 65.03 71.56 c 84.79 77.88 a 65.33 52.34 41.70 33.19 56.28
2008 31.39 38.64 42.90 48.42 61.34 69.89 b 79.21 77.32 66.23 54.29 45.07 32.85 53.96
2009 32.23 36.93 a 43.97 51.86 b 63.48 a 68.85 78.97 75.19 72.00 50.15 a 42.25 28.00 53.66
2010 37.60 41.34 45.60 50.02 a 55.33 a 67.27 77.62 a 76.19 j 66.96 g 57.85 41.22 35.90 50.97
2011 32.98 a 35.82 c 45.18 c 48.98 b 56.53 a 66.38 a 76.63 a 78.48 a 70.91 a 55.42 41.26 a 32.52 a 53.43
2012 35.91 c 40.31 c 47.00 a 56.50 c 60.35 a 68.45 81.53 79.62 c 68.62 54.00 a 44.20 36.50 a 56.08
2013 20.85 38.20 45.14 b ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 34.73
Period of Record Statistics
MEAN 32.55 38.90 46.21 53.87 62.67 70.50 79.78 77.70 67.79 55.81 42.55 34.10 55.24
S.D. 5.52 3.74 2.81 3.00 2.94 3.26 2.57 2.34 2.90 2.58 3.35 3.92 1.14
SKEW -0.92 -0.41 0.10 0.12 0.01 0.17 -0.61 -0.03 -0.19 0.15 0.00 -1.49 -0.26
MAX 44.69 45.96 52.60 60.48 69.77 78.67 85.18 82.58 73.40 64.21 53.37 39.50 57.44
MIN 14.47 28.41 40.58 47.77 55.33 63.36 70.08 72.34 61.55 49.23 32.70 17.50 52.59
NO YRS 77 76 74 75 76 74 75 76 76 76 77 77 61