ARROWROCK DAM, IDAHO

Monthly Average Minimum 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 26.39 l 19.45 19.45
1912 18.52 24.86 28.65 35.67 41.39 50.17 49.19 47.84 38.90 34.42 29.80 19.26 34.89
1913 15.42 14.04 26.52 34.87 43.94 49.53 52.68 54.39 43.87 34.32 32.90 18.55 35.08
1914 26.71 25.14 31.39 37.97 43.39 46.80 56.32 53.87 44.70 40.74 28.20 12.71 37.33
1915 14.68 30.11 32.45 39.40 40.61 43.63 52.03 b 51.58 ----- z ----- z 28.57 22.21 b 35.53
1916 15.65 25.97 31.55 37.93 38.29 46.41 c 54.23 a 53.87 46.34 a 35.32 c 24.18 b 16.46 c 35.52
1917 16.83 y 14.43 16.68 32.57 41.10 b 45.53 58.31 e 55.78 m 49.63 c 38.50 g 32.79 k 31.10 36.17
1918 25.62 b 21.81 b 32.83 a 34.50 b 40.55 b 57.62 d 60.52 j 53.03 b 51.04 d 40.90 29.00 f 20.28 b 37.82
1919 19.16 25.00 28.03 a 37.07 c 43.50 c 48.54 d 58.46 c 57.68 47.44 e 32.67 d 26.73 12.07 b 36.36
1920 17.13 23.61 a 28.56 f 33.37 c 40.57 c 50.00 b 60.63 d 57.03 a 47.90 37.53 a 31.00 a 24.65 38.49
1921 22.00 22.89 31.93 c 34.28 e 44.26 52.28 a 57.50 a 58.41 b 42.68 e 38.40 f 31.45 a 24.00 38.33
1922 11.17 a 18.07 23.35 31.72 a 41.83 b 53.47 57.96 e 60.19 48.28 a 40.29 26.25 b 20.64 c 36.10
1923 19.87 a 11.46 24.70 a 36.83 a 43.42 48.33 59.06 57.15 d 49.86 b 39.20 a 29.66 a 21.19 36.73
1924 10.77 29.96 a 27.54 c 35.04 d 46.35 49.72 a 57.30 d 52.59 b 46.25 b 39.64 c 29.07 c 10.26 d 36.21
1925 19.19 27.12 c 31.03 b 39.07 46.14 b 50.57 b 61.04 c 55.34 b 47.04 b 36.34 b 28.21 b 27.60 a 39.06
1926 19.81 29.04 30.55 b 40.23 43.30 a 53.03 a 59.14 b 56.17 a 39.15 d 36.63 d 37.33 21.52 38.82
1927 20.61 24.73 b 29.47 a 36.03 a 42.23 50.67 c 57.93 a 56.23 45.87 39.82 c 34.88 d 15.96 c 37.87
1928 18.19 19.86 a 30.20 a 34.90 48.13 47.93 b 58.55 54.48 b 46.93 c 36.84 f 30.83 f 13.73 e 37.29
1929 7.33 a 11.04 c 29.30 a 34.27 41.71 48.66 a 56.93 d 58.43 c 42.44 c 37.48 h 21.96 c 26.68 c 34.43
1930 4.19 29.96 31.07 a 39.19 c 41.70 a 47.14 b 59.39 c 57.79 b 46.38 f 35.75 c 20.08 d 9.17 b 34.13
1931 14.93 a 20.00 a 28.85 e 34.85 c 43.19 51.61 b 58.94 55.77 a 46.64 b 37.10 a 20.84 e 12.89 c 35.47
1932 11.30 a 14.86 27.84 37.76 a 44.47 a 50.21 a 55.37 a 52.59 b 44.38 a 35.52 30.64 b 12.13 34.75
1933 12.48 4.67 a 24.29 33.20 38.35 51.73 57.03 55.27 a 43.00 b 37.48 d 28.63 27.67 a 34.48
1934 29.00 31.04 a 35.20 a 40.70 46.77 49.60 58.43 a 56.75 c 43.64 b 37.64 c 33.37 c 18.80 a 40.08
1935 16.48 20.32 25.55 36.33 40.43 a 48.61 b 55.84 53.97 47.93 b 35.07 c 23.43 b 19.29 35.27
1936 16.03 13.89 a 23.23 a 35.63 45.58 52.36 b 60.07 b 57.48 43.72 a 36.03 21.14 a 21.79 b 35.58
1937 0.43 a 13.59 a 28.29 34.31 a 43.47 a 48.59 a 58.90 b 53.10 a 47.90 a 35.96 c 32.60 24.52 35.14
1938 20.27 a 27.26 a 28.53 a 36.70 41.67 a 49.97 a 56.29 c 52.55 50.03 a 38.77 a 23.17 22.48 37.31
1939 17.90 11.44 a 24.20 a 35.57 44.19 45.07 b 56.83 a 56.58 45.67 35.97 25.50 27.71 35.55
1940 24.00 26.14 30.58 36.33 44.06 50.33 56.48 55.74 48.77 38.84 24.67 23.65 38.30
1941 21.19 25.43 28.97 34.73 43.42 48.07 57.48 56.34 b 43.90 36.68 30.17 26.13 37.71
1942 12.26 18.68 25.19 35.37 39.65 45.77 56.48 54.55 45.83 35.48 28.60 21.97 34.99
1943 16.35 19.18 23.16 38.13 39.94 46.07 54.71 52.52 47.87 39.29 28.50 24.35 35.84
1944 14.58 23.07 24.13 33.90 42.16 46.83 53.03 52.32 46.13 38.35 30.93 22.26 35.64
1945 23.65 26.07 27.00 32.63 43.29 46.70 55.58 53.68 42.87 37.39 28.90 18.87 36.39
1946 13.13 15.89 29.03 37.07 42.81 48.57 57.26 55.26 44.50 34.03 29.77 28.61 36.33
1947 12.16 25.11 31.90 37.03 46.68 48.63 55.48 54.35 46.63 40.74 26.67 22.61 37.33
1948 19.68 19.69 24.90 34.47 42.03 51.80 52.32 53.16 46.59 a 36.47 a 26.90 11.39 34.95
1949 -8.81 15.11 a 28.48 36.55 a 44.26 47.23 54.65 55.90 48.17 31.94 30.80 20.19 33.71
1950 14.55 19.46 27.19 34.90 38.81 47.50 54.87 54.58 48.97 40.13 31.73 29.26 36.83
1951 15.97 23.21 22.68 35.37 42.97 46.43 56.29 54.68 45.30 37.13 27.07 18.58 35.47
1952 15.35 14.79 23.55 36.47 42.94 48.70 53.32 54.97 46.87 37.68 22.47 24.32 35.12
1953 30.71 25.68 29.74 33.40 39.61 46.23 55.30 a 53.81 47.90 a 36.97 33.17 22.84 37.95
1954 25.29 27.64 27.23 35.42 d 44.19 46.47 56.00 a 52.03 44.30 33.74 31.43 20.29 37.00
1955 11.97 12.86 21.55 32.00 40.71 49.83 54.87 55.61 44.60 36.71 24.67 24.16 34.13
1956 24.42 14.38 26.29 36.53 44.81 48.43 56.87 52.94 44.60 36.58 25.70 22.16 36.14
1957 9.94 20.07 29.48 36.60 46.00 50.43 57.52 58.45 48.83 36.81 24.37 25.58 37.01
1958 18.58 29.00 28.26 35.27 47.13 52.53 57.10 58.74 46.37 39.13 30.33 31.03 39.46
1959 27.65 28.07 30.29 36.87 40.03 51.60 57.71 53.03 46.23 39.16 27.63 23.26 38.46
1960 20.03 21.66 29.06 36.57 41.23 50.87 61.48 51.90 49.17 a 36.84 31.33 22.58 37.73
1961 22.94 30.68 32.26 34.30 43.27 a 53.93 56.87 60.35 44.03 36.68 27.73 22.74 38.82
1962 13.32 24.32 26.81 37.73 43.61 48.93 55.45 52.90 46.40 38.90 32.70 28.74 37.49
1963 17.81 30.96 31.19 35.53 46.65 49.63 54.23 55.29 52.13 44.16 32.90 22.87 39.45
1964 18.48 15.76 21.81 33.23 41.48 50.47 57.65 53.10 43.30 37.42 28.97 25.00 35.56
1965 25.29 25.21 25.26 38.53 41.61 49.80 56.52 54.52 43.00 40.00 34.27 25.19 38.27
1966 25.10 23.82 29.29 35.23 45.10 49.30 55.29 53.61 50.10 34.06 33.00 24.68 38.22
1967 26.42 26.64 29.74 32.27 41.06 50.23 58.87 56.90 49.70 34.77 31.67 19.45 38.14
1968 19.48 27.52 31.32 31.67 40.74 49.57 56.13 51.81 44.10 35.84 30.33 23.52 36.84
1969 23.35 23.93 25.58 36.57 44.52 50.93 54.90 53.29 44.97 31.23 27.50 24.26 36.75
1970 24.74 26.61 28.90 30.13 40.97 50.80 55.26 54.06 38.70 32.68 31.93 21.00 36.32
1971 19.71 21.96 22.90 33.90 42.45 48.33 56.16 59.39 40.97 35.16 29.77 22.13 36.07
1972 20.35 22.72 29.77 33.20 42.48 51.67 54.90 57.16 41.60 37.35 30.43 18.90 36.71
1973 21.74 28.04 31.13 34.77 43.19 49.57 57.13 53.97 44.63 35.87 30.73 27.55 38.19
1974 16.19 21.00 27.97 33.43 39.13 52.27 56.26 54.32 45.37 37.58 30.30 22.68 36.37
1975 18.32 22.43 27.39 31.30 38.65 46.77 59.29 51.94 45.30 36.84 27.07 23.35 35.72
1976 19.10 18.79 21.10 32.43 42.65 45.93 56.87 ----- z 46.23 34.03 26.93 18.68 32.98
1977 14.71 20.14 25.06 35.77 37.68 52.60 53.32 54.52 43.43 34.26 27.13 26.87 35.46
1978 25.84 26.82 32.06 35.97 39.84 47.00 56.00 52.13 45.00 36.23 25.87 16.19 36.58
1979 7.35 22.18 27.77 33.13 42.55 48.90 56.19 55.23 48.90 42.16 26.30 27.00 36.47
1980 22.23 a 29.97 31.32 39.00 44.26 46.73 56.58 50.84 47.40 36.97 28.83 24.26 38.20
1981 27.16 26.29 31.06 37.03 42.00 46.93 53.10 56.19 46.63 34.90 32.87 26.97 38.43
1982 15.58 16.75 28.84 31.20 39.29 50.47 54.48 56.68 46.53 37.52 26.97 23.52 35.65
1983 26.29 29.50 34.61 34.33 42.58 47.70 52.61 58.70 a 44.17 38.71 33.53 19.55 38.52
1984 16.71 19.38 30.13 34.17 40.68 46.53 55.68 57.55 42.27 35.90 30.67 13.06 35.23
1985 11.13 12.29 22.32 36.13 43.32 51.30 62.50 s 51.43 j 41.97 32.68 i 19.87 10.81 27.68
1986 20.68 27.75 32.87 34.23 41.87 53.50 53.23 57.84 44.50 36.75 c 30.32 k 20.45 38.52
1987 17.61 26.07 30.16 36.93 46.19 51.53 53.62 j 49.95 l 45.67 i 34.71 j 30.79 k 25.94 o 34.75
1988 11.70 k 22.22 b 28.03 36.47 40.87 51.60 53.45 50.37 a 40.70 40.55 29.93 17.97 37.47
1989 14.03 11.96 29.97 36.83 40.42 50.20 56.52 51.87 44.30 36.90 28.43 21.58 35.25
1990 24.16 18.04 a 28.87 39.53 39.81 47.37 56.16 55.23 50.17 35.42 29.23 10.23 36.18
1991 15.23 26.29 29.26 33.17 38.42 44.33 53.42 55.10 46.23 34.58 28.37 22.29 35.56
1992 23.29 29.10 33.32 37.47 44.32 51.67 52.61 53.90 44.43 39.68 26.50 17.68 37.83
1993 13.39 18.14 29.65 35.00 47.42 46.20 48.77 52.39 45.30 39.03 23.03 25.13 35.29
1994 26.58 23.21 30.68 37.83 45.58 49.23 58.19 57.35 48.97 35.94 23.20 21.94 38.23
1995 24.57 a 29.11 30.71 35.63 42.87 48.17 55.74 51.84 47.93 35.29 33.63 28.41 n 39.59
1996 24.05 j 21.90 32.10 36.30 41.16 48.97 56.97 54.58 ----- z 34.50 o 32.50 24.18 i 40.56
1997 22.97 27.00 k 30.47 l 35.90 44.00 51.47 55.45 57.61 c 51.13 36.58 31.87 24.00 41.10
1998 27.61 29.93 31.00 35.37 42.80 a 47.47 60.52 57.35 52.05 i 34.97 32.13 22.65 38.34
1999 25.13 h 24.82 35.55 45.43 49.71 49.04 f 52.07 a 57.13 a 43.47 36.23 33.57 b 24.63 d 40.26
2000 22.05 j 29.70 f 32.83 a 39.07 b 47.92 f 50.00 c 57.86 b 58.22 h 47.93 b 38.11 l 24.68 h 21.35 e 41.51
2001 17.33 p 22.56 l 29.65 e 34.33 f 41.92 e 48.50 d 57.26 58.23 a 46.61 b 36.13 a 31.97 a 18.29 40.95
2002 21.13 h 21.18 25.36 i 38.30 ----- z 54.48 e 62.71 g 54.96 e 48.57 i 35.27 e 29.37 29.52 37.58
2003 30.26 27.43 g 34.52 j 38.77 44.19 52.44 e 63.32 60.84 48.47 41.00 26.63 27.97 43.39
2004 17.88 g 22.48 33.13 40.24 e 43.97 49.63 59.13 57.48 b 47.23 40.84 27.06 l 21.89 l 43.79
2005 19.76 b 22.96 29.77 33.13 45.74 49.17 61.00 60.71 47.87 ----- z ----- z ----- z 41.12
2006 ----- z ----- z ----- z 38.57 46.10 55.33 ----- z ----- z 48.87 ----- z 31.80 22.26 40.49
2007 19.32 28.18 35.45 37.77 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 23.00 m 30.18
2008 15.16 20.28 26.58 32.43 44.68 49.53 59.32 57.77 46.73 ----- z ----- z ----- z 39.17
2009 ----- z 25.39 29.39 36.53 44.06 51.63 58.32 57.52 52.07 37.71 ----- z ----- z 43.63
2010 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
2011 21.65 24.14 32.03 33.50 41.00 47.10 54.61 59.03 50.93 41.61 30.10 23.10 38.23
2012 24.57 a 25.55 32.81 38.93 42.19 48.17 60.81 58.58 48.70 38.03 34.13 28.68 40.10
2013 15.94 25.61 31.13 35.00 z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 24.22
Period of Record Statistics
MEAN 18.50 22.45 28.67 35.76 42.75 49.40 56.42 55.23 46.08 37.07 28.88 21.69 36.72
S.D. 6.49 5.60 3.51 2.46 2.41 2.48 2.56 2.56 2.85 2.39 3.64 4.94 1.48
SKEW -0.97 -0.66 -0.64 0.51 0.25 0.36 -0.22 0.02 -0.25 0.27 -0.46 -0.62 0.31
MAX 30.71 31.04 35.55 45.43 49.71 57.62 63.32 60.84 52.13 44.16 37.33 31.10 40.10
MIN -8.81 4.67 16.68 30.13 37.68 43.63 48.77 47.84 38.70 31.23 19.87 9.17 33.71
NO YRS 91 96 96 99 97 98 94 93 93 87 89 93 72