ARROWROCK DAM, IDAHO

Monthly Average Temperature (Degrees Fahrenheit)

(100448)

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
1911 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 34.78 l 28.89 28.89
1912 26.42 33.64 40.23 49.02 57.60 68.40 69.45 67.71 56.45 48.77 40.92 28.06 48.89
1913 24.16 25.73 37.35 51.52 60.44 65.90 70.77 72.61 63.20 49.48 42.35 27.32 49.24
1914 34.61 33.88 45.95 52.67 61.72 a 63.47 75.08 72.66 61.47 55.13 41.50 23.05 51.76
1915 25.65 39.43 47.19 55.87 54.32 60.05 68.81 e 74.74 ----- z ----- z 38.87 31.43 b 49.64
1916 24.18 34.09 42.87 53.10 ----- z 64.88 r 70.45 a 69.62 b 61.38 z 47.48 c 33.11 b 24.52 c 44.38
1917 29.08 y 25.68 29.19 43.28 a 52.98 b 61.27 76.52 e 73.44 m 66.00 c 53.21 g 43.39 k 37.52 49.05
1918 32.48 b 30.88 b 42.68 a 46.37 d 54.16 b 72.48 d 75.50 j 67.81 b 65.08 d 52.00 38.17 f 27.31 b 49.12
1919 27.97 a 32.45 38.18 a 49.83 c 59.57 c 65.37 d 75.95 c 75.48 63.42 e 44.35 d 34.15 20.19 b 48.91
1920 25.39 33.69 b 37.23 g 44.46 f 53.83 e 64.77 d 76.50 g 73.22 b 62.63 48.78 a 38.16 b 30.29 47.86
1921 29.52 31.39 41.98 c 44.20 j 55.69 66.66 b 74.09 b 74.50 d 57.00 h 51.61 l 40.21 b 30.10 49.35
1922 19.17 b 26.96 32.98 42.96 b 54.78 b 69.38 74.44 e 74.76 65.25 b 54.03 35.12 d 26.69 d 48.04
1923 28.17 b 22.11 35.81 b 48.02 b 55.92 60.82 74.84 72.74 d 65.10 d 49.17 b 38.91 b 27.63 48.27
1924 19.52 38.59 b 37.84 c 47.70 g 63.44 65.18 b 74.40 g 72.06 e 63.63 d 51.36 c 37.06 c 16.08 g 49.85
1925 26.71 33.86 c 41.12 b 50.05 59.90 b 64.66 b 77.29 c 71.29 b 62.18 b 47.76 d 36.73 b 32.62 b 50.35
1926 26.85 36.52 43.60 b 53.73 57.45 a 70.28 a 77.65 d 72.76 b 56.50 d 51.88 g 43.47 27.16 51.45
1927 ----- z 31.52 f 38.95 a 46.93 b 53.45 64.77 f 74.55 b 71.74 59.67 52.98 e 40.86 h 22.96 f 56.90
1928 24.81 29.41 b 40.12 c 44.90 62.24 61.98 d 75.50 71.91 d 64.19 c 49.08 k 38.40 j 21.50 j 52.78
1929 15.97 b 19.66 f 38.47 b 45.03 56.48 63.38 b 72.98 d 77.06 d 58.69 f 53.50 l 34.40 d 34.45 c 48.69
1930 13.87 36.89 41.91 b 53.28 c 53.87 a 62.73 b 77.84 f 74.09 b 62.50 j 48.81 e 28.82 h 17.33 b 44.75
1931 23.10 a 29.69 b 39.76 j 48.78 c 59.87 68.98 d 78.55 75.91 b 89.52 b 50.53 b 30.58 j 21.26 f 58.33
1932 20.62 b 23.79 36.76 48.93 b 56.60 a 64.59 b 72.15 a 70.79 b 63.00 b 49.68 39.48 b 20.68 47.26
1933 22.47 16.09 a 33.61 46.70 51.79 68.23 76.42 73.38 a 59.54 c 54.11 d 39.17 34.38 a 47.99
1934 35.21 40.81 b 47.98 a 55.45 63.27 64.93 77.52 a 76.18 c 61.02 b 50.96 c 42.02 c 26.71 b 53.51
1935 24.94 29.62 35.84 46.92 54.02 a 64.46 b 72.87 71.58 65.55 b 50.20 c 30.83 d 26.35 47.77
1936 23.39 22.96 a 32.88 a 49.40 59.93 a 63.71 i 77.17 d 73.79 60.91 b 51.77 34.03 a 29.09 b 46.85
1937 9.86 b 23.83 a 39.13 44.43 a 58.47 a 63.16 a 75.00 w 70.80 a 65.03 a 51.36 c 40.75 31.84 45.33
1938 27.93 c 35.81 a 37.17 b 49.03 54.64 b 65.21 b 72.48 e 70.61 67.14 b 50.81 b 31.43 29.71 49.33
1939 26.94 22.37 b 34.81 j 50.43 60.11 60.81 d 74.26 b 74.79 62.23 48.82 38.75 35.45 50.45
1940 30.97 34.41 42.73 48.35 60.82 69.32 75.18 75.10 62.62 52.71 33.02 32.03 51.44
1941 29.44 36.00 44.55 49.73 58.79 64.13 75.44 71.79 b 57.50 48.84 39.43 32.02 50.64
1942 19.53 28.07 37.18 48.52 51.34 60.53 74.95 72.76 62.82 50.48 36.60 27.82 47.55
1943 24.10 29.12 34.47 51.58 52.60 60.10 72.65 70.32 65.98 51.35 37.57 30.95 48.40
1944 23.74 31.66 35.61 45.82 56.87 59.88 70.56 69.71 62.03 54.45 36.85 28.35 47.96
1945 29.16 33.95 37.13 44.13 55.73 60.07 73.52 71.76 58.88 53.10 35.67 25.89 48.25
1946 21.02 25.05 39.06 50.42 55.63 63.95 74.73 72.74 60.27 44.40 36.70 34.31 48.19
1947 20.69 34.52 42.97 48.62 61.03 60.95 74.00 71.19 62.13 52.73 33.97 29.65 49.37
1948 27.53 29.79 34.52 45.82 55.03 65.82 69.42 70.24 62.59 a 51.32 a 34.73 19.35 47.18
1949 2.24 24.17 a 38.18 52.14 a 58.52 62.97 72.60 73.08 65.15 44.71 42.07 27.92 46.98
1950 22.45 28.96 36.42 46.72 52.84 61.40 72.05 71.47 63.70 53.61 39.68 35.05 48.70
1951 23.98 31.62 33.69 49.90 55.89 61.12 74.48 b 71.18 62.28 47.53 35.48 25.65 47.73
1952 22.84 c 24.07 33.53 50.85 56.74 63.27 70.97 72.48 64.72 55.11 32.93 30.89 48.20
1953 36.43 a 34.73 40.32 45.25 50.97 58.85 73.58 a 70.94 65.10 a 52.26 42.83 29.02 50.02
1954 31.26 35.86 37.13 48.54 d 59.02 59.33 73.55 b 68.58 61.20 48.61 41.93 27.68 49.39
1955 20.21 23.79 31.63 42.08 53.13 65.07 67.63 74.68 61.50 50.76 31.88 30.92 46.11
1956 30.50 22.78 37.73 48.57 a 57.31 63.23 73.97 69.69 62.72 48.34 34.10 a 28.81 48.14
1957 18.19 29.12 37.90 47.03 57.26 65.12 73.79 73.98 65.18 48.44 33.03 31.55 48.38
1958 25.03 36.77 37.58 45.17 62.61 65.17 73.26 75.76 62.05 55.00 37.80 36.58 51.06
1959 33.66 35.18 40.89 51.45 52.95 67.83 76.03 70.47 59.57 50.39 37.75 30.55 50.56
1960 26.48 29.93 39.95 50.03 54.97 67.50 79.48 69.35 65.97 a 50.47 38.55 29.52 50.18
1961 30.68 37.70 41.61 47.47 58.37 a 72.18 76.58 77.87 58.03 48.68 35.32 28.81 51.11
1962 21.19 30.91 36.97 52.32 54.94 64.52 71.71 69.63 63.60 51.40 40.83 35.03 49.42
1963 25.34 40.86 41.89 46.07 58.81 61.85 70.92 72.42 67.35 56.05 39.82 28.66 50.84
1964 25.29 25.53 31.82 44.50 53.87 61.52 74.16 68.74 58.08 51.84 36.67 31.53 46.96
1965 30.89 33.25 36.58 48.77 53.61 62.53 72.02 69.98 d 55.87 55.13 43.10 31.44 49.43
1966 31.34 32.27 40.06 47.77 60.03 63.18 73.11 71.42 66.03 48.00 40.95 30.81 50.41
1967 32.40 35.64 39.56 41.75 54.90 62.97 75.82 75.85 66.28 47.81 40.00 26.35 49.95
1968 27.21 36.34 42.95 43.70 54.48 63.97 74.52 65.66 59.27 48.63 37.37 29.85 48.66
1969 29.77 30.89 37.56 48.55 59.11 64.22 71.66 72.10 62.22 43.92 37.75 30.52 49.02
1970 29.85 36.70 38.50 41.08 54.45 65.23 71.65 73.08 54.70 45.10 38.85 27.27 48.04
1971 26.60 31.55 33.71 45.72 55.89 61.52 72.21 76.55 56.30 46.68 36.12 27.61 47.54
1972 26.27 29.59 40.39 44.48 56.81 65.25 71.13 73.35 56.53 49.50 37.00 24.81 47.93
1973 28.29 36.30 41.08 46.27 57.71 64.13 73.89 71.53 59.82 49.55 36.17 33.40 49.84
1974 22.90 30.18 37.39 45.12 52.58 68.50 71.95 70.23 62.95 51.13 38.13 28.92 48.33
1975 24.82 29.54 35.97 39.98 51.39 60.47 75.82 67.06 62.65 48.19 35.53 29.02 46.70
1976 25.66 27.81 31.24 44.12 57.24 60.28 72.65 ----- z 61.28 48.53 38.55 28.13 45.05
1977 21.08 32.04 35.63 50.80 49.97 68.45 70.66 71.26 59.35 49.18 35.35 32.77 48.04
1978 32.60 33.73 44.16 45.77 52.32 61.88 71.11 68.68 58.35 51.74 35.30 24.63 48.36
1979 16.58 30.55 39.05 44.70 56.03 64.58 73.02 71.24 66.58 54.55 34.42 33.16 48.71
1980 28.32 a 37.31 39.61 50.67 55.56 61.15 72.55 67.26 61.23 50.79 37.68 31.06 49.43
1981 32.90 35.18 42.24 48.27 54.10 61.33 71.03 74.95 63.45 47.03 41.55 33.06 50.43
1982 23.56 25.00 38.31 42.80 53.10 64.67 69.37 73.35 60.43 48.66 34.88 30.34 47.04
1983 33.18 37.39 43.10 45.32 55.19 62.20 68.15 74.18 a 60.63 51.48 40.48 25.34 49.72
1984 23.02 27.64 39.58 45.12 53.21 59.97 72.56 73.58 58.33 47.26 36.67 a 20.84 46.48
1985 18.95 23.71 34.00 50.17 57.52 66.62 80.08 s 69.69 j 55.19 a 45.70 i 28.70 17.55 39.16
1986 29.42 35.75 45.26 46.48 55.90 70.03 68.63 75.58 56.38 50.36 c 38.24 k 28.24 51.09
1987 25.27 35.14 40.79 53.63 60.92 67.65 71.26 j 68.74 l 64.95 i 53.10 j 40.50 k 33.09 o 47.24
1988 21.87 l 33.94 c 40.17 a 51.03 56.65 68.22 73.90 70.55 a 59.62 a 57.81 37.43 24.85 52.20
1989 21.50 20.54 39.06 50.88 54.68 66.40 75.44 68.89 62.18 49.34 37.67 29.84 48.03
1990 31.85 29.15 a 41.52 53.02 53.18 a 64.07 a 74.02 72.24 67.78 48.92 37.57 19.10 49.37
1991 23.61 37.98 39.61 45.00 51.71 60.38 72.66 73.68 63.05 49.71 35.27 30.42 48.59
1992 31.52 39.41 47.06 51.67 61.42 68.00 69.34 72.58 61.00 54.40 33.18 25.66 51.27
1993 21.97 27.25 38.73 45.65 60.95 59.77 63.60 67.63 62.03 51.79 33.95 32.02 47.11
1994 32.97 31.68 44.13 51.07 59.26 66.22 75.90 75.87 66.53 48.79 30.82 28.60 50.99
1995 31.67 a 39.59 a 40.00 47.00 54.58 61.68 71.45 68.95 63.58 48.85 41.40 35.03 n 51.71
1996 31.12 j 30.09 42.65 48.70 53.69 64.91 a 74.71 72.45 ----- z 47.54 q 40.97 31.23 i 53.52
1997 29.65 34.71 k 43.21 l 47.78 59.67 h 66.23 71.56 74.12 c 66.18 49.66 39.92 29.68 52.75
1998 34.85 37.77 41.50 47.48 a 54.05 a 60.26 a 76.32 74.26 67.55 i 48.76 40.22 29.77 49.57
1999 31.96 h 33.12 44.24 55.58 61.69 62.81 f 70.58 a 73.87 a 60.90 52.59 b 44.18 b 29.72 d 52.65
2000 28.92 l 37.33 f 42.37 a 51.75 b 60.44 f 65.67 c 75.03 b 76.07 h 62.57 b 48.91 n 32.70 h 27.92 e 54.22
2001 26.07 p 32.03 l 42.60 e 46.54 f 60.17 e 65.21 d 72.23 76.25 a 64.75 b 48.05 a 40.50 a 22.53 54.70
2002 26.48 i 29.95 35.52 i 48.93 ----- z 67.64 e 78.60 g 70.13 e 63.17 i 49.40 e 39.43 36.15 48.81
2003 36.53 36.74 i 43.50 j 48.85 56.15 66.76 e 79.31 76.10 65.20 56.19 35.62 34.56 55.53
2004 24.81 g 32.41 46.08 53.06 f 57.10 65.58 75.39 72.88 b 61.78 52.24 35.72 l 29.79 l 57.93
2005 27.76 b 33.04 42.84 45.98 57.82 62.92 77.77 76.32 63.17 ----- z ----- z ----- z 54.18
2006 ----- z ----- z ----- z 50.22 60.18 69.58 ----- z ----- z 62.45 ----- z 40.60 29.32 52.06
2007 26.97 36.95 46.56 50.08 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 28.47 m 40.14
2008 23.19 28.71 36.10 42.72 57.44 63.48 76.10 75.06 64.00 ----- z ----- z ----- z 51.87
2009 ----- z 33.43 38.00 47.67 57.98 64.20 75.29 73.39 68.85 48.40 ----- z ----- z 56.36
2010 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
2011 29.39 c 32.66 39.92 43.68 53.38 a 60.72 72.10 76.52 68.05 52.90 37.63 31.26 49.85
2012 31.75 a 33.19 41.85 51.17 a 55.82 64.03 77.98 76.16 66.10 50.47 42.40 34.50 a 52.12
2013 22.74 34.50 42.37 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 33.20
Period of Record Statistics
MEAN 26.01 31.53 39.35 48.05 56.45 64.27 73.44 72.42 62.59 50.38 37.56 28.97 48.99
S.D. 5.74 5.05 3.89 3.38 3.12 3.07 2.78 2.61 4.28 2.81 3.29 4.19 1.51
SKEW -0.94 -0.49 -0.13 0.04 0.27 0.42 -0.39 -0.21 2.55 0.17 -0.24 -0.65 0.55
MAX 36.53 40.86 47.98 55.87 63.44 72.48 79.48 77.87 89.52 57.81 44.18 37.52 53.51
MIN 2.24 16.09 29.19 39.98 49.97 58.85 63.60 65.66 54.70 43.92 28.70 17.33 46.11
NO YRS 90 94 94 95 95 95 90 93 90 86 86 89 64