ARROWROCK DAM, IDAHO

Monthly Total Precipitation (inches)

(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 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1.52 2.09 3.61
1912 4.99 2.49 2.00 2.40 2.33 1.27 0.87 0.24 0.87 1.56 0.65 2.01 21.68
1913 2.75 0.12 3.60 0.45 0.10 2.22 3.31 0.29 0.79 2.80 4.28 3.35 24.06
1914 2.99 1.84 0.20 1.71 1.55 0.32 1.03 0.00 0.49 1.70 0.33 0.60 12.76
1915 1.96 2.59 0.95 2.65 4.19 1.47 0.56 0.00 0.41 0.18 4.10 5.13 24.19
1916 5.06 7.99 1.33 a 0.50 1.27 0.05 a 0.83 0.55 0.00 0.88 2.70 2.40 23.56
1917 0.00 z 2.10 3.45 3.70 1.70 0.00 0.00 0.00 1.00 0.13 2.65 6.05 20.78
1918 3.40 0.60 2.45 0.35 0.65 0.10 0.00 0.25 2.16 1.65 0.60 0.60 12.81
1919 2.60 4.15 2.90 1.30 0.40 0.00 0.00 0.00 0.35 1.90 4.85 1.30 19.75
1920 1.50 0.30 z 2.50 2.05 0.53 1.42 0.00 z 0.38 0.79 1.86 3.93 3.58 18.54
1921 2.35 2.44 1.20 1.60 2.29 0.30 0.00 z 0.00 z 0.62 0.32 6.10 2.41 19.63
1922 1.14 0.79 2.46 1.48 0.46 0.68 0.20 1.29 0.00 0.56 0.95 2.79 12.80
1923 3.85 0.27 0.62 1.38 1.64 2.41 0.27 0.63 0.67 2.37 1.08 1.31 16.50
1924 0.70 1.34 0.50 0.40 0.00 0.14 0.03 0.00 0.14 2.37 1.56 3.43 10.61
1925 4.15 3.19 0.72 3.09 0.44 1.80 x 0.47 0.33 0.85 2.08 1.98 2.06 19.36
1926 0.88 3.99 0.48 1.18 1.42 0.16 0.29 1.08 0.00 0.10 5.53 2.48 17.59
1927 3.20 5.56 1.35 0.46 2.03 1.20 0.00 z 0.46 1.06 1.24 6.99 1.89 25.44
1928 2.41 0.44 3.78 1.03 0.63 0.16 0.10 0.12 0.56 1.21 0.98 2.52 13.94
1929 4.43 1.55 1.58 2.13 0.30 0.96 0.00 z 0.37 0.26 0.43 0.00 z 2.41 14.42
1930 2.46 2.91 2.05 x 1.54 2.20 0.11 0.00 z 0.87 0.78 1.34 2.41 0.41 15.03
1931 1.62 1.18 3.78 1.53 0.00 z 0.09 0.00 z 0.06 0.58 0.77 2.77 1.79 14.17
1932 1.91 1.27 5.09 1.63 1.79 1.47 1.19 0.05 0.00 z 0.84 2.73 2.04 20.01
1933 2.53 3.14 1.13 0.67 1.84 0.27 0.00 0.00 0.12 1.23 0.28 2.79 14.00
1934 2.24 1.50 1.75 0.56 0.35 1.06 0.05 0.06 0.16 2.19 3.00 2.68 15.60
1935 1.45 1.14 1.26 3.55 0.87 0.05 0.00 0.00 0.00 0.15 1.18 1.02 10.67
1936 5.54 4.60 1.46 1.12 0.59 1.68 0.30 0.25 0.30 0.00 0.00 1.45 17.29
1937 2.83 3.11 1.50 2.24 0.93 0.56 0.28 0.00 0.29 1.36 3.17 3.65 19.92
1938 3.08 1.03 4.36 0.73 2.71 2.35 2.09 0.00 0.14 1.57 3.40 1.60 23.06
1939 1.85 2.89 0.80 0.60 0.15 0.21 0.26 0.11 1.38 2.00 0.03 1.97 12.25
1940 3.17 4.13 2.89 3.04 0.08 0.08 0.31 0.05 2.43 1.78 2.39 2.11 22.46
1941 2.68 1.66 0.53 2.23 2.67 2.49 0.50 1.18 0.13 1.13 1.51 4.20 20.91
1942 1.45 2.32 0.63 1.50 2.54 0.62 0.00 0.08 0.00 0.48 6.32 7.38 23.32
1943 3.84 1.78 2.85 1.75 0.55 1.35 0.13 0.00 0.00 2.46 1.22 0.58 16.51
1944 0.61 2.35 0.87 2.81 0.15 2.59 0.00 0.00 0.07 0.61 3.16 1.89 15.11
1945 1.54 4.45 2.55 0.80 3.24 1.49 0.07 0.04 0.47 0.75 3.51 5.90 24.81
1946 3.85 3.54 2.19 0.66 1.04 0.13 0.01 0.12 0.40 2.11 3.28 1.81 19.14
1947 2.01 0.94 3.36 0.87 0.97 1.38 0.00 0.05 0.63 2.79 1.62 1.34 15.96
1948 2.43 3.04 1.78 2.52 0.77 1.80 0.18 0.00 0.22 0.55 2.34 5.23 20.86
1949 0.78 5.97 0.73 0.04 1.48 0.67 0.00 0.09 0.21 1.80 2.09 1.93 15.79
1950 4.58 2.13 4.53 0.62 1.35 0.81 0.17 0.42 1.14 1.01 3.00 3.15 22.91
1951 4.26 4.24 1.76 1.66 0.95 0.91 0.22 0.18 0.01 3.07 3.53 5.01 25.80
1952 2.46 2.82 1.51 0.61 1.15 0.92 0.41 0.00 0.01 0.00 0.77 2.20 12.86
1953 6.94 1.79 2.32 1.25 2.96 1.79 0.00 0.26 0.05 0.16 3.31 2.13 22.96
1954 2.92 1.03 2.04 0.71 d 0.65 2.25 0.08 0.08 0.23 0.31 1.54 2.56 14.40
1955 1.43 0.81 1.48 3.31 1.59 1.06 0.18 0.00 0.35 1.46 3.28 5.49 20.44
1956 4.56 2.48 0.82 1.40 2.56 1.02 0.59 0.11 0.01 3.69 0.45 2.32 20.01
1957 1.97 3.72 3.20 1.82 2.63 0.15 0.00 0.00 0.03 0.99 1.73 4.95 21.19
1958 3.15 3.11 1.89 3.29 1.06 3.46 0.59 0.15 0.17 0.21 3.11 2.37 22.56
1959 3.42 1.86 2.00 0.35 2.96 0.13 0.00 0.37 3.74 2.17 0.88 1.65 19.53
1960 1.94 4.09 3.12 0.46 1.96 0.02 0.34 0.68 0.78 a 0.72 4.09 1.22 19.42
1961 1.05 2.17 2.39 0.62 0.83 0.40 0.12 0.34 1.01 3.57 2.86 2.44 17.80
1962 1.56 2.20 2.82 1.14 2.21 0.62 0.01 0.06 0.65 1.55 2.50 0.50 15.82
1963 1.56 3.11 0.78 2.61 1.71 2.35 0.00 0.39 1.35 0.70 5.07 1.05 20.68
1964 4.20 0.19 1.46 1.13 0.88 1.26 0.47 0.11 1.15 0.33 4.55 7.57 23.30
1965 5.05 0.65 0.89 3.94 1.14 1.36 0.19 1.27 1.30 0.28 2.85 0.96 19.88
1966 2.36 0.82 1.92 1.10 0.16 0.25 0.02 0.00 0.10 0.48 2.67 2.44 12.32
1967 3.89 1.04 1.00 1.52 0.62 2.73 0.11 0.00 0.57 1.74 1.37 0.92 15.51
1968 0.95 4.19 0.77 0.67 0.98 0.79 0.01 3.85 0.12 1.06 3.17 4.05 20.61
1969 5.20 1.55 0.30 1.03 0.34 1.57 0.09 0.00 0.38 0.43 0.68 3.22 14.79
1970 9.09 1.07 0.91 1.27 1.63 2.52 0.88 0.02 0.88 2.23 4.95 3.84 29.29
1971 5.19 1.66 2.93 0.25 0.62 2.15 0.10 0.05 0.34 0.77 4.54 4.19 22.79
1972 5.51 2.15 2.33 1.47 0.90 1.11 0.05 0.41 1.09 0.70 2.49 3.12 21.33
1973 1.78 0.98 1.02 2.11 0.70 0.44 0.04 0.08 0.72 1.28 5.36 4.37 18.88
1974 1.86 2.01 2.66 0.78 0.09 0.57 0.57 0.33 0.00 1.08 2.02 3.22 15.19
1975 1.57 4.24 3.79 1.71 0.64 0.72 0.47 0.23 0.27 3.08 1.44 3.53 21.69
1976 4.07 1.73 0.73 1.68 0.48 1.40 0.10 0.00 z 1.66 0.50 0.06 0.12 12.53
1977 0.72 0.54 1.41 0.19 2.26 1.29 0.54 0.71 0.72 0.37 3.74 4.49 16.98
1978 2.61 3.08 1.44 3.15 0.44 1.02 1.53 0.28 1.41 0.00 0.87 1.78 17.61
1979 2.17 1.97 0.72 1.02 1.28 0.35 0.00 0.86 0.39 2.13 1.64 1.15 13.68
1980 4.27 2.77 1.98 0.77 3.18 0.69 0.07 0.01 3.00 0.36 1.82 3.17 22.09
1981 0.57 1.67 1.73 2.17 1.38 0.81 0.16 0.10 0.31 1.49 4.22 5.81 20.42
1982 4.44 4.48 2.21 1.81 0.28 0.34 1.29 0.14 2.13 2.67 2.97 3.99 26.75
1983 2.93 1.80 4.84 1.75 2.03 0.70 1.33 0.94 0.68 1.12 5.32 6.66 30.10
1984 1.06 2.34 2.36 1.78 1.59 1.47 0.55 0.51 0.76 1.17 5.02 2.31 20.92
1985 0.17 1.18 1.42 0.88 1.12 0.27 0.63 0.05 2.18 c 1.98 d 2.42 b 1.00 13.30
1986 1.94 8.48 d 2.46 b 1.79 1.38 b 0.86 0.23 0.22 3.70 0.38 1.43 b 0.16 23.03
1987 2.05 a 1.74 2.31 0.15 0.84 1.08 0.59 b 0.05 0.00 0.00 1.87 c 2.17 b 12.85
1988 2.89 c 0.56 b 1.55 b 1.58 b 0.92 d 0.52 0.00 0.08 0.26 0.00 6.50 e 2.62 17.48
1989 3.61 1.20 e 3.92 f 1.00 0.38 0.25 0.12 0.47 0.84 1.40 1.34 d 0.28 10.89
1990 2.17 2.57 1.24 e 3.33 3.13 0.44 0.34 0.52 0.03 0.68 1.42 d 1.41 17.28
1991 2.77 0.50 2.02 2.03 2.01 0.44 0.01 0.06 1.31 1.45 3.05 g 0.66 13.26
1992 0.37 2.41 0.55 1.23 a 0.00 1.93 0.34 0.00 0.26 1.23 2.86 3.26 14.44
1993 3.23 2.26 4.18 2.71 1.40 1.97 0.64 0.63 0.00 0.94 0.37 1.50 19.83
1994 2.23 2.69 b 0.14 1.05 1.51 0.30 0.14 0.00 0.46 0.66 3.55 a 3.10 c 15.83
1995 3.52 b 1.88 a 2.59 f 1.81 2.72 2.19 0.58 0.17 0.03 0.77 3.65 b 5.19 k 17.32
1996 3.74 h 2.30 c 1.96 d 2.17 d 2.41 b 0.19 0.30 b 0.06 0.00 z 1.37 f 3.39 f 9.90 m 9.39
1997 4.03 c 1.56 d 1.43 e 1.77 b 0.96 1.06 b 0.80 0.55 0.80 1.20 1.08 1.14 c 16.38
1998 6.55 d 2.56 1.65 b 1.00 5.06 b 2.14 0.31 0.00 0.82 d 0.19 c 2.04 b 3.49 b 25.81
1999 4.06 c 5.66 b 0.95 0.99 1.40 1.31 h 0.00 0.29 a 0.00 0.33 2.92 a 2.64 a 19.24
2000 4.13 i 4.02 h 1.70 c 1.48 1.15 e 0.41 0.05 0.03 0.76 d 2.79 l 1.63 e 2.25 j 7.21
2001 1.19 1.07 j 1.37 e 1.23 d 0.59 0.29 0.65 0.00 0.78 1.52 3.30 3.59 d 14.51
2002 2.07 b 0.80 2.15 c 1.68 e 0.00 z 0.17 a 0.00 0.01 0.15 a 0.30 1.58 3.42 12.33
2003 3.27 b 0.94 a 3.54 e 1.41 2.26 0.30 0.23 0.61 0.26 0.02 2.35 3.34 18.53
2004 2.95 b 2.69 0.89 1.08 3.26 0.00 0.56 1.25 0.54 1.58 0.73 f 0.78 h 14.80
2005 0.21 b 0.28 1.30 0.95 4.21 1.37 0.02 0.00 0.03 a 0.00 z 0.00 z 0.00 z 8.37
2006 0.00 z 0.00 z 0.00 z 1.70 0.95 0.85 0.00 z 0.00 z 0.10 0.00 z 1.35 1.49 6.44
2007 0.38 1.29 0.30 1.03 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2.98 v 3.00
2008 5.23 g 2.25 k 2.06 e 0.28 d 1.06 f 0.62 a 0.13 0.03 b 0.86 j 0.00 z 0.00 z 0.00 z 3.12
2009 0.00 z 0.26 d 2.95 n 1.78 f 1.51 g 3.66 i 0.38 g 1.25 r 0.02 2.58 u 0.00 z 0.00 z 0.28
2010 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
2011 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
2012 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
2013 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
Period of Record Statistics
MEAN 2.80 2.31 1.88 1.48 1.41 0.96 0.35 0.29 0.64 1.17 2.60 2.67 18.83
S.D. 1.61 1.58 1.12 0.88 1.03 0.80 0.50 0.50 0.75 0.88 1.60 1.62 4.39
SKEW 0.92 1.40 0.80 0.76 1.03 0.83 3.13 4.43 2.15 0.72 0.60 0.88 0.21
MAX 9.09 8.48 5.09 3.94 5.06 3.46 3.31 3.85 3.74 3.69 6.99 7.57 30.10
MIN 0.17 0.12 0.14 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.12 10.61
NO YRS 92 93 93 97 93 94 89 93 94 91 91 91 74