ARROWROCK DAM, IDAHO

Monthly Average Maximum Temperature (Degrees Fahrenheit)

(100448)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201304
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 43.17 l 38.32 38.32
1912 34.32 42.41 51.81 62.37 73.81 86.63 89.71 87.58 74.00 63.13 52.03 36.87 62.89
1913 32.90 37.43 48.19 68.17 76.94 82.27 88.87 90.84 82.53 64.65 51.80 36.10 63.39
1914 42.52 42.61 60.52 67.37 80.10 a 80.13 93.84 91.45 78.23 69.52 54.80 33.39 66.21
1915 36.61 48.75 61.94 72.33 68.03 76.47 86.14 c 97.90 ----- z ----- z 49.17 40.63 a 63.80
1916 32.71 42.21 54.19 68.27 ----- z 79.08 r 86.67 a 85.62 b 80.50 z 59.64 c 42.04 b 32.57 c 55.99
1917 41.33 y 36.93 41.71 54.03 a 64.86 b 77.00 94.73 e 90.50 c 82.37 c 67.92 g 53.57 i 43.94 65.12
1918 39.34 b 39.96 b 52.53 a 58.52 c 67.76 b 87.22 c 90.62 g 82.59 b 79.12 d 63.10 47.33 f 34.34 b 60.45
1919 36.07 a 39.89 48.33 a 62.59 c 75.64 c 82.19 d 93.43 c 93.29 79.40 e 55.57 c 41.57 28.31 b 61.36
1920 33.65 43.93 a 45.92 g 55.89 c 68.07 c 78.89 b 92.70 d 89.43 a 77.37 60.03 a 46.10 a 35.94 62.00
1921 37.03 39.89 51.87 a 55.32 e 67.13 81.17 a 90.70 a 90.72 b 72.20 e 67.08 f 49.34 a 36.19 61.05
1922 27.13 a 35.86 42.61 54.62 a 67.97 a 85.30 90.92 e 89.32 82.55 a 67.77 44.46 b 33.37 a 60.16
1923 36.53 a 32.75 47.20 a 59.14 a 68.42 73.30 90.61 88.33 d 80.75 b 59.13 a 48.34 a 34.06 59.88
1924 28.26 47.46 a 48.14 c 61.08 d 80.52 80.97 a 92.50 c 91.21 c 80.57 b 63.07 c 45.04 c 25.52 d 62.03
1925 34.23 40.60 c 51.21 b 61.03 73.66 b 78.75 b 93.54 c 87.24 b 77.32 b 59.79 b 45.25 b 37.40 a 61.67
1926 33.90 44.00 56.66 b 67.23 71.60 a 87.52 a 95.72 b 89.80 a 73.85 d 67.32 c 49.60 32.81 64.17
1927 ----- z 39.13 e 48.43 a 57.45 a 64.68 79.07 c 91.07 a 87.26 73.47 66.36 c 47.58 d 29.79 c 62.21
1928 31.42 39.11 a 50.31 b 54.90 76.35 76.46 b 92.45 89.76 b 81.44 c 63.28 f 46.24 e 30.46 e 60.81
1929 24.20 a 28.80 c 47.80 a 55.80 71.26 77.45 a 89.04 d 95.78 d 75.52 c 68.60 f 46.50 d 42.21 c 59.49
1930 23.55 43.82 52.90 a 67.37 c 66.03 a 78.32 b 95.21 c 90.38 b 79.21 f 61.64 c 38.69 d 25.48 b 58.49
1931 31.27 a 39.56 a 49.88 e 62.71 b 76.55 86.11 b 98.16 96.27 a 128.63 64.47 a 39.20 e 30.57 c 66.95
1932 29.60 a 32.72 45.68 60.07 a 68.73 a 79.14 a 88.93 a 89.00 b 82.10 a 63.84 48.32 b 29.23 59.78
1933 32.45 27.52 a 42.94 60.20 65.23 84.73 95.81 91.50 a 76.75 b 70.54 c 49.70 41.10 a 61.54
1934 41.42 50.74 a 60.77 a 70.20 79.77 80.27 96.60 a 95.61 c 78.39 b 64.29 c 50.67 c 34.43 a 66.93
1935 33.39 38.93 46.13 57.50 67.60 a 80.62 a 89.90 89.19 83.18 b 65.32 c 39.18 b 33.42 60.36
1936 30.74 32.04 a 42.53 a 63.17 74.37 a 76.81 i 94.59 b 90.10 78.07 a 67.52 46.93 a 36.38 b 59.67
1937 20.10 a 34.07 a 49.97 54.55 a 73.47 a 77.72 a 92.38 w 88.50 a 82.17 a 66.75 c 48.90 39.16 57.76
1938 35.90 b 44.37 a 46.13 a 61.37 66.80 a 80.21 a 88.79 c 88.68 84.17 a 63.10 a 39.70 36.94 61.35
1939 35.97 33.81 a 48.32 i 65.30 76.03 77.25 b 91.80 a 93.00 78.80 61.68 52.00 43.19 64.44
1940 37.94 42.69 54.87 60.37 77.58 88.30 93.87 94.45 76.47 66.58 41.37 40.42 64.57
1941 37.68 46.57 60.13 64.73 74.16 80.20 93.39 87.29 71.10 61.00 48.70 37.90 63.57
1942 26.81 37.46 49.16 61.67 63.03 75.30 93.42 90.97 79.80 65.48 44.60 33.68 60.11
1943 31.84 39.07 45.77 65.03 65.26 74.13 90.58 88.13 84.10 63.42 46.63 37.55 60.96
1944 32.90 40.24 47.10 57.73 71.58 72.93 88.10 87.10 77.93 70.55 42.77 34.45 60.28
1945 34.68 41.82 47.26 55.63 68.16 73.43 91.45 89.84 74.90 68.81 42.43 32.90 60.11
1946 28.90 34.21 49.10 63.77 68.45 79.33 92.19 90.23 76.03 54.77 43.63 40.00 60.05
1947 29.23 43.93 54.03 60.20 75.39 73.27 92.52 88.03 77.63 64.71 41.27 36.68 61.41
1948 35.39 39.90 44.13 57.17 68.03 79.83 86.52 87.32 77.90 66.17 a 42.57 27.32 59.35
1949 13.29 33.22 a 47.87 67.37 72.77 78.70 90.55 90.26 82.13 57.48 53.33 35.65 60.22
1950 30.35 38.46 45.65 58.53 66.87 75.30 89.23 88.35 78.43 67.10 47.63 40.84 60.56
1951 32.00 40.04 44.71 64.43 68.81 75.80 92.59 b 87.68 79.27 57.94 43.90 32.71 59.99
1952 30.25 c 33.34 43.52 65.23 70.55 77.83 88.61 90.00 82.57 72.55 43.40 37.45 61.28
1953 42.00 a 43.79 50.90 57.10 62.32 71.47 91.87 a 88.06 82.73 67.55 52.50 35.19 62.12
1954 37.23 44.07 47.03 61.65 d 73.84 72.20 91.33 a 85.13 78.10 63.48 52.43 35.06 61.80
1955 28.45 34.71 41.71 52.17 65.55 80.30 80.39 93.74 78.40 64.81 39.10 37.68 58.08
1956 36.58 31.17 49.16 60.83 a 69.81 78.03 91.06 86.45 80.83 60.10 42.34 a 35.45 60.15
1957 26.45 38.18 46.32 57.47 68.52 79.80 90.06 89.52 81.53 60.06 41.70 37.52 59.76
1958 31.48 44.54 46.90 55.07 78.10 77.80 89.42 92.77 77.73 70.87 45.27 42.13 62.67
1959 39.68 42.29 51.48 66.03 65.87 84.07 94.35 87.90 72.90 61.61 47.87 37.84 62.66
1960 32.94 38.21 50.84 63.50 68.71 84.13 97.48 86.81 82.76 a 64.10 45.77 36.45 62.64
1961 38.42 44.71 50.97 60.63 73.47 a 90.43 96.29 95.39 72.03 60.68 42.90 34.87 63.40
1962 29.06 37.50 47.13 66.90 66.26 80.10 87.97 86.35 80.80 63.90 48.97 41.32 61.36
1963 32.87 50.75 52.58 56.60 70.97 74.07 87.61 89.55 82.57 67.94 46.73 34.45 62.22
1964 32.10 35.31 41.84 55.77 66.26 72.57 90.68 84.39 72.87 66.26 44.37 38.06 58.37
1965 36.48 41.29 47.90 59.00 65.61 75.27 87.52 84.81 d 68.73 70.26 51.93 37.68 60.54
1966 37.58 40.71 50.84 60.30 74.97 77.07 90.94 89.23 81.97 61.94 48.90 36.94 62.61
1967 38.39 44.64 49.39 51.23 68.74 75.70 92.77 94.81 82.87 60.84 48.33 33.26 61.75
1968 34.94 45.17 54.58 55.73 68.23 78.37 92.90 79.52 74.43 61.42 44.40 36.19 60.49
1969 36.19 37.86 49.55 60.53 73.71 77.50 88.42 90.90 79.47 56.61 48.00 36.77 61.29
1970 34.97 46.79 48.10 52.03 67.94 79.67 88.03 92.10 70.70 57.52 45.77 33.55 59.76
1971 33.48 41.14 44.52 57.53 69.32 74.70 88.26 93.71 71.63 58.19 42.47 33.10 59.00
1972 32.19 36.45 51.00 55.77 71.13 78.83 87.35 89.55 71.47 61.65 43.57 30.71 59.14
1973 34.84 44.57 51.03 57.77 72.23 78.70 90.65 89.10 75.00 63.23 41.60 39.26 61.50
1974 29.61 39.36 46.81 56.80 66.03 84.73 87.65 86.13 80.53 64.68 45.97 35.16 60.29
1975 31.32 36.64 44.55 48.67 64.13 74.17 92.35 82.19 80.00 59.55 44.00 34.68 57.69
1976 32.23 36.83 41.39 55.80 71.84 74.63 88.42 ----- z 76.33 63.03 50.17 37.58 57.11
1977 27.45 43.93 46.19 65.83 62.26 84.30 88.00 88.00 75.27 64.10 43.57 38.68 60.63
1978 39.35 40.64 56.26 55.57 64.81 76.77 86.23 85.23 71.70 67.26 44.73 33.06 60.13
1979 25.81 38.93 50.32 56.27 69.52 80.27 89.84 87.26 84.27 66.94 42.53 39.32 60.94
1980 34.77 44.66 47.90 62.33 66.87 75.57 88.52 83.68 75.07 64.61 46.53 37.87 60.70
1981 38.65 44.07 53.42 59.50 66.19 75.73 88.97 93.71 80.27 59.16 50.23 39.16 62.42
1982 31.55 33.25 47.77 54.40 66.90 78.87 84.26 90.03 74.33 59.81 42.80 37.16 58.43
1983 40.06 45.29 51.58 56.30 67.81 76.70 83.68 89.65 77.10 64.26 47.43 31.13 60.92
1984 29.32 35.90 49.03 56.07 65.74 73.40 89.45 89.61 74.40 58.61 43.07 a 28.61 57.77
1985 26.77 35.14 45.68 64.20 71.71 81.93 97.67 s 87.95 j 68.10 a 58.73 i 37.53 24.29 50.60
1986 38.16 43.75 57.65 58.73 69.94 86.57 84.03 93.32 68.27 63.96 c 46.16 k 36.03 63.67
1987 32.94 44.21 51.42 70.33 75.65 83.77 88.90 j 87.53 l 84.24 i 71.48 j 50.21 k 40.25 o 59.72
1988 31.00 l 45.52 b 52.27 a 65.60 72.42 84.83 94.35 91.06 78.31 a 75.06 44.93 31.74 66.92
1989 28.97 29.11 48.16 64.93 68.94 82.60 94.35 85.90 80.07 61.77 46.90 38.10 60.82
1990 39.55 39.96 54.16 66.50 66.37 a 80.79 a 91.87 89.26 85.40 62.42 45.90 27.97 62.51
1991 32.00 49.68 49.97 56.83 65.00 76.43 91.90 92.26 79.87 64.84 42.17 38.55 61.62
1992 39.74 49.72 60.81 65.87 78.52 84.33 86.06 91.26 77.57 69.13 39.87 33.65 64.71
1993 30.55 36.36 47.81 56.30 74.48 73.33 78.42 82.87 78.77 64.55 44.87 38.90 58.93
1994 39.35 40.14 57.58 64.30 72.94 83.20 93.61 94.39 84.10 61.65 38.43 35.26 63.75
1995 38.77 50.19 a 49.29 58.37 66.29 75.20 87.16 86.06 79.23 62.42 49.17 41.65 n 63.83
1996 38.19 j 38.28 53.19 61.10 66.23 80.79 a 92.45 90.32 ----- z 59.93 q 49.43 38.27 i 66.47
1997 36.32 42.41 k 56.05 k 59.67 75.17 h 81.00 87.68 90.71 81.23 62.74 47.97 35.35 64.74
1998 42.10 45.61 52.00 59.59 a 65.39 72.93 a 92.13 91.16 81.90 62.55 48.30 36.90 62.55
1999 38.58 41.43 52.94 65.73 73.68 77.33 89.26 90.39 78.33 68.83 b 54.27 35.71 63.87
2000 35.45 k 44.50 a 52.06 64.63 72.40 a 81.83 92.32 92.90 77.40 59.06 n 40.03 34.58 65.27
2001 34.80 p 41.50 l 55.81 58.76 a 78.59 b 81.76 a 87.19 94.35 82.67 60.13 49.03 a 26.77 67.51
2002 32.00 i 38.71 45.68 i 59.57 ----- z 80.54 d 94.50 g 85.31 e 77.76 i 63.54 e 49.50 42.77 59.99
2003 42.81 46.11 i 52.48 j 58.93 68.10 81.08 e 95.29 91.35 81.93 71.39 44.60 41.16 67.66
2004 31.75 g 42.34 59.03 65.62 f 70.23 81.53 91.65 88.13 76.33 63.65 44.39 l 37.68 l 71.61
2005 35.68 43.11 55.90 58.83 69.90 76.67 94.55 91.94 78.47 ----- z ----- z ----- z 67.23
2006 ----- z ----- z ----- z 61.87 74.26 83.83 ----- z ----- z 76.03 ----- z 49.40 36.39 63.63
2007 34.61 45.71 57.68 62.40 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 33.94 m 50.10
2008 31.23 37.14 45.61 53.00 70.19 77.43 92.87 92.35 81.27 ----- z ----- z ----- z 64.57
2009 ----- z 41.46 46.61 58.80 71.90 76.77 92.26 89.26 85.63 59.10 ----- z ----- z 69.09
2010 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
2011 35.21 c 41.18 47.81 53.87 65.63 a 74.33 89.58 94.00 85.17 64.19 45.17 39.42 61.30
2012 38.93 a 40.83 50.90 63.76 a 69.45 79.90 95.16 93.74 83.50 62.90 50.67 40.40 a 64.18
2013 29.55 43.39 53.61 74.00 z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 42.18
Period of Record Statistics
MEAN 33.57 40.42 50.01 60.24 70.14 79.14 90.67 89.66 78.92 63.73 45.93 35.59 61.40
S.D. 5.07 4.95 4.70 4.72 4.32 4.10 3.49 3.36 6.63 3.95 3.95 4.12 1.98
SKEW -0.82 -0.23 0.48 0.21 0.48 0.40 -0.60 -0.21 4.41 0.28 0.02 -0.55 0.67
MAX 42.81 50.75 61.94 72.33 80.52 90.43 98.16 97.90 128.63 75.06 54.80 43.94 66.95
MIN 13.29 27.52 41.39 48.67 62.26 71.47 78.42 79.52 68.10 54.77 37.53 24.29 57.69
NO YRS 91 97 95 99 96 97 93 95 93 87 91 93 69