SWAN FALLS POWER HOUSE, IDAHO

Monthly Average Maximum 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 94.47 a 93.57 c 87.23 70.03 43.23 35.71 70.71
1936 40.29 37.55 g 56.04 e 68.97 83.07 a 87.33 99.64 c 95.48 b 82.25 b 73.43 a 53.07 a 44.29 71.26
1937 24.87 a 41.37 a 57.27 a 61.63 78.74 83.10 97.65 93.29 85.60 72.84 56.50 46.50 a 66.61
1938 45.86 c 51.64 c 53.10 a 65.87 71.59 d 84.62 a 93.38 b 92.37 a 88.17 a 67.77 a 47.70 43.74 67.15
1939 42.90 42.93 58.52 71.33 80.13 80.80 96.06 96.13 83.43 67.55 57.33 48.13 68.77
1940 40.90 49.14 60.13 65.20 80.19 91.07 96.32 96.29 79.43 68.61 47.47 45.68 68.37
1941 43.48 49.93 a 61.19 64.97 75.19 79.87 95.87 a 89.71 76.67 67.55 55.30 46.00 67.14
1942 31.26 43.39 54.13 a 69.43 69.32 77.93 97.20 a 94.74 84.20 71.52 52.73 42.29 65.68
1943 41.61 48.39 54.77 71.27 72.43 a 77.70 93.00 a 92.26 87.67 70.00 53.27 43.23 67.13
1944 37.55 46.34 54.77 64.83 77.55 75.87 92.06 93.39 84.60 76.16 48.50 38.27 a 65.82
1945 42.00 c 47.61 55.13 a 60.33 74.06 79.30 96.39 94.94 80.27 74.58 53.40 43.06 66.76
1946 44.55 47.50 58.61 73.31 a 78.13 85.67 96.13 94.61 80.83 61.06 50.53 48.45 68.28
1947 36.19 51.86 61.94 66.97 80.87 78.23 97.58 94.48 83.77 71.16 50.57 44.26 68.16
1948 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 91.42 81.33 71.74 50.73 38.07 b 66.66
1949 23.77 44.36 57.82 c 73.55 a 78.57 a 84.07 96.32 93.58 85.50 63.29 59.37 43.39 66.97
1950 35.26 49.18 54.26 66.07 75.10 a 83.83 94.13 94.71 81.47 73.77 54.60 44.74 67.26
1951 40.84 48.89 54.55 71.33 75.29 82.77 98.32 92.68 85.90 65.94 51.40 39.61 67.29
1952 34.52 41.69 50.61 72.53 77.35 84.00 95.68 95.71 87.93 78.10 49.70 43.48 67.61
1953 52.74 51.89 61.29 65.67 70.68 79.00 98.45 93.73 a 88.73 73.19 60.00 a 41.61 69.75
1954 48.10 54.36 56.55 71.20 82.23 79.93 98.40 a 89.52 85.00 b 69.55 58.07 b 42.16 69.59
1955 35.52 41.93 52.55 61.64 b 75.48 b 87.07 a 93.10 97.37 d 85.36 b 71.86 b 49.13 47.03 66.50
1956 43.71 40.62 59.58 g 70.03 78.14 b 86.67 96.77 91.87 86.93 67.00 49.67 40.71 c 68.38
1957 34.26 48.68 58.67 a 64.86 a 74.90 87.14 a 96.90 93.97 88.03 65.81 50.33 45.23 67.40
1958 43.10 54.79 56.26 63.70 85.94 84.83 95.42 97.39 84.37 75.35 53.20 46.42 70.06
1959 47.23 49.50 58.81 72.63 72.03 91.27 100.16 92.61 77.30 68.68 55.13 42.65 69.00
1960 34.90 44.07 60.00 70.13 76.29 92.40 102.06 91.97 87.47 69.45 52.43 42.42 68.63
1961 44.77 53.50 59.03 67.47 79.03 95.60 99.42 98.35 77.00 67.50 a 52.93 41.29 69.66
1962 33.29 42.36 54.77 74.90 73.74 86.83 94.13 93.29 86.43 69.42 56.30 45.32 67.57
1963 36.90 56.25 60.03 64.10 79.00 81.63 94.65 94.87 87.40 73.16 53.00 37.00 68.17
1964 37.97 43.90 52.42 66.27 76.52 80.87 99.03 93.10 81.70 73.58 51.73 46.16 66.94
1965 41.55 52.68 58.06 67.83 74.32 83.93 94.74 89.61 76.70 76.16 57.50 43.00 68.01
1966 45.81 47.57 61.55 70.60 84.23 85.47 97.10 95.06 87.57 70.29 55.67 42.39 70.27
1967 47.71 54.43 59.00 59.77 77.94 84.17 99.81 100.16 89.60 69.65 54.17 39.58 69.66
1968 41.77 55.21 63.71 66.37 77.06 88.40 99.16 85.97 82.37 69.42 50.53 43.42 68.62
1969 42.94 44.43 58.52 71.63 82.90 85.23 96.61 97.84 85.90 63.32 54.73 44.35 69.03
1970 45.68 56.04 56.68 61.20 77.87 88.10 97.04 g 99.13 79.67 65.42 53.97 42.48 66.02
1971 44.23 52.32 54.90 66.73 78.13 83.37 95.65 100.00 79.77 66.39 50.50 40.19 67.68
1972 41.03 48.14 61.81 65.53 80.74 87.40 95.71 96.45 78.83 68.52 50.47 34.19 67.40
1973 40.10 50.75 58.06 66.10 81.55 88.73 97.29 94.84 81.77 69.97 51.13 46.42 68.89
1974 40.61 50.30 a 56.48 67.20 75.29 93.70 94.77 94.10 88.65 d 70.23 53.54 f 42.42 70.34
1975 38.29 47.43 55.84 58.20 74.77 83.97 98.10 90.58 86.77 68.48 51.07 41.48 66.25
1976 42.48 47.28 53.23 65.87 82.35 84.90 96.90 87.06 82.43 70.06 56.83 43.48 67.74
1977 30.19 49.32 56.65 75.43 71.84 90.87 94.68 93.58 82.00 70.48 52.93 46.71 67.89
1978 46.32 48.39 64.65 64.97 72.65 85.97 93.68 93.81 80.30 73.10 49.47 38.39 67.64
1979 28.58 45.14 59.71 66.47 77.97 89.73 96.87 91.87 88.90 71.29 48.33 48.05 j 69.53
1980 40.87 51.41 57.03 72.17 74.55 82.83 94.48 91.19 82.43 70.77 52.10 42.39 67.69
1981 41.90 51.61 61.35 68.50 73.55 85.83 96.32 98.81 86.43 66.13 56.60 46.19 69.44
1982 38.13 44.21 57.32 64.40 77.00 86.63 90.61 95.48 ----- z 67.06 47.97 41.97 64.62
1983 43.74 52.89 58.65 63.37 76.48 85.50 92.06 95.45 83.47 70.68 55.03 35.10 67.70
1984 33.74 41.59 57.97 64.57 75.55 80.77 96.71 98.45 82.60 65.26 52.20 37.35 65.56
1985 34.77 40.64 53.52 74.43 82.29 92.90 i 101.13 93.42 75.37 67.03 41.33 24.61 62.60
1986 42.29 53.21 64.94 67.10 78.74 94.60 92.29 98.87 75.97 72.16 54.48 c 39.94 69.55
1987 40.29 50.86 60.48 ----- z 82.55 91.23 92.71 93.35 88.83 76.32 54.17 44.26 70.46
1988 39.55 52.97 62.26 73.43 78.55 91.57 99.39 95.97 85.00 80.39 52.23 39.29 70.88
1989 37.94 37.93 59.45 73.07 77.35 90.93 100.10 91.65 86.07 68.81 54.47 43.23 68.41
1990 45.77 49.71 63.26 75.53 74.10 87.47 97.84 94.84 91.30 71.48 55.40 31.26 69.83
1991 35.68 54.50 59.55 64.87 71.71 82.73 98.13 98.52 86.67 71.26 48.23 44.52 68.03
1992 45.58 57.14 67.29 75.00 86.45 89.07 92.81 97.74 83.37 73.10 46.37 39.84 71.15
1993 35.97 41.39 54.06 64.37 81.77 81.37 85.26 89.06 85.73 70.52 49.27 44.90 65.31
1994 41.58 47.36 65.65 70.53 80.16 89.57 98.48 97.81 88.10 67.90 45.43 38.32 69.24
1995 45.45 55.82 58.55 65.83 73.45 83.23 93.77 93.52 85.87 66.68 l 56.70 41.52 68.52
1996 44.06 47.38 59.39 66.30 71.74 86.67 97.23 94.39 80.43 68.13 54.77 46.16 68.05
1997 42.42 50.64 ----- z 62.60 78.84 80.97 90.35 93.23 83.34 a 67.23 53.80 41.65 67.73
1998 49.06 51.07 57.61 62.90 69.90 ----- z ----- z 95.42 85.90 67.42 54.50 41.81 63.56
1999 45.55 48.39 57.06 63.30 71.55 b 82.20 92.03 93.16 82.20 71.57 a 59.27 40.77 67.25
2000 44.16 52.41 57.35 71.40 75.65 87.27 95.10 93.90 80.73 ----- z 64.30 40.06 69.30
2001 38.81 45.46 61.23 63.37 79.61 85.53 91.03 96.26 87.20 69.03 55.83 40.48 67.82
2002 42.32 47.25 54.58 67.30 76.97 87.76 a 97.61 88.63 d 81.90 66.40 a 54.23 46.84 67.65
2003 46.19 49.75 60.77 63.53 76.16 87.13 98.68 94.87 83.90 74.74 50.13 46.97 69.40
2004 38.71 44.45 65.26 69.07 74.13 85.00 94.77 92.27 a 80.07 68.39 47.10 a 44.32 66.96
2005 40.87 50.39 61.06 64.07 72.90 78.30 96.06 94.23 79.67 69.29 49.33 38.87 66.25
2006 45.26 46.86 53.90 65.57 76.35 87.13 98.71 93.03 82.70 66.94 53.40 43.42 67.77
2007 42.26 52.11 ----- z 65.40 78.00 85.15 c 98.77 93.13 a 79.93 64.29 51.43 39.42 68.17
2008 37.81 46.97 53.10 60.67 73.00 82.71 b 93.10 91.81 82.40 67.71 55.03 40.87 65.43
2009 38.94 45.07 a 54.87 63.36 b 76.27 a 79.47 93.10 89.35 87.60 60.00 a 52.63 35.74 64.70
2010 44.16 48.50 56.10 61.28 a 66.10 a 79.10 92.70 a 90.86 j 81.96 g 70.06 50.43 42.39 61.08
2011 40.30 a 44.04 c 54.39 c 59.64 b 67.23 a 78.10 a 91.20 a 94.37 a 86.79 a 66.81 51.34 a 43.37 a 64.80
2012 44.61 c 50.35 c 57.23 a 68.37 c 73.20 a 82.43 96.03 95.25 c 85.13 68.00 a 54.33 45.07 a 68.33
2013 29.29 47.61 57.86 b ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 44.92
Period of Record Statistics
MEAN 40.44 48.52 58.04 67.06 76.62 85.02 95.84 94.09 83.82 69.70 52.58 42.06 67.88
S.D. 5.42 4.36 3.50 4.25 4.09 4.34 2.92 2.88 3.63 3.65 3.81 3.95 1.44
SKEW -0.80 -0.18 0.39 0.23 0.02 0.17 -0.59 -0.23 -0.36 0.19 -0.07 -1.45 -0.11
MAX 52.74 57.14 67.29 75.53 86.45 95.60 102.06 100.16 91.30 80.39 64.30 48.45 71.15
MIN 23.77 37.93 50.61 58.20 66.10 75.87 85.26 85.97 75.37 60.00 41.33 24.61 64.70
NO YRS 77 76 74 75 76 74 75 77 76 76 77 77 62