OLD FAITHFUL, WYOMING

Monthly Total Precipitation (inches)

(486845)

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 200603
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
1978 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1.63 0.39 2.76 2.99 7.77
1979 1.44 2.59 2.47 1.63 1.31 1.30 0.99 2.28 0.59 2.26 0.85 0.95 18.66
1980 4.15 2.06 3.59 1.33 4.41 1.27 3.39 1.87 3.81 1.16 1.75 3.54 32.33
1981 0.72 1.95 0.95 2.11 2.87 f 4.36 0.00 z 0.40 0.78 1.76 2.79 4.45 20.27
1982 3.58 b 2.06 4.93 b 2.95 h 0.00 z 2.71 2.21 0.13 b 1.27 b 0.31 l 2.71 3.03 22.63
1983 1.23 2.14 3.16 d 0.00 z 0.24 c 1.49 2.91 1.87 3.09 c 0.00 z 0.00 z 0.00 z 16.13
1984 0.00 z 0.00 z 0.74 f 0.75 m 1.30 h 1.31 a 1.36 1.89 0.00 z 0.00 z 2.10 c 1.45 i 6.66
1985 0.00 z 2.36 e 2.16 g 1.47 e 2.21 2.57 3.16 0.99 4.58 b 0.31 r 4.12 1.65 a 23.11
1986 1.64 c 3.72 a 1.61 c 3.80 3.07 a 3.89 a 3.19 a 2.08 1.21 b 0.40 2.69 0.13 b 27.43
1987 1.72 1.04 2.11 0.98 3.29 1.16 3.13 1.14 0.33 0.20 0.74 c 1.41 d 17.25
1988 2.53 0.83 c 1.98 c 3.76 1.67 0.67 0.25 0.22 0.38 0.30 4.89 b 1.11 a 18.59
1989 3.36 a 0.73 b 3.75 c 0.50 2.45 a 1.70 1.35 1.44 1.07 2.87 1.69 1.27 22.18
1990 2.87 2.75 0.86 1.29 1.58 a 1.76 1.18 1.69 0.86 1.80 1.78 1.94 20.36
1991 0.72 a 0.36 3.43 2.38 4.21 1.56 1.11 1.20 a 1.78 2.90 1.61 a 1.55 22.81
1992 0.28 a 2.04 a 0.90 2.91 c 1.51 b 2.88 1.61 0.44 3.21 1.40 0.91 b 4.66 22.75
1993 2.56 2.22 1.41 a 2.39 c 2.58 4.27 b 2.09 a 1.35 0.78 a 1.74 0.96 1.95 24.30
1994 1.62 a 4.00 1.21 1.44 2.88 2.29 0.53 0.89 0.34 1.81 a 2.71 b 3.74 23.46
1995 3.24 2.03 a 5.57 3.30 2.03 2.75 3.14 2.49 0.47 1.71 2.63 b 3.99 33.35
1996 3.60 2.16 2.52 2.92 c 5.15 0.66 1.00 0.57 0.69 0.00 z 5.82 8.08 b 33.17
1997 4.80 a 1.72 a 1.82 c 1.75 a 2.61 2.22 b 1.58 1.84 3.40 3.10 1.09 a 0.92 a 26.85
1998 2.95 b 0.87 1.13 a 2.23 1.99 5.33 2.76 0.89 2.02 1.44 4.52 a 1.96 a 28.09
1999 2.74 4.37 2.02 1.19 3.59 2.11 0.94 3.07 0.37 0.70 1.38 1.51 a 23.99
2000 2.50 2.04 1.17 1.53 4.46 1.67 0.40 1.52 1.91 a 1.62 0.81 a 1.60 c 21.23
2001 0.45 1.19 b 1.37 1.62 1.85 a 0.99 c 1.09 0.00 z 0.24 a 0.00 z 1.80 a 1.58 c 12.18
2002 1.72 c 0.55 d 2.40 b 2.79 a 1.06 a 2.26 a 1.11 0.76 a 1.71 2.56 a 1.29 a 1.17 b 19.38
2003 1.64 1.41 c 2.09 d 3.16 a 0.00 z 0.00 z 0.23 0.84 1.32 0.95 1.77 4.49 a 17.90
2004 3.93 a 1.08 0.50 1.93 4.27 c 3.31 1.97 3.53 1.79 2.38 a 0.35 1.68 a 26.72
2005 2.10 a 0.79 2.29 0.98 0.00 z 3.70 0.70 4.37 1.33 1.89 4.58 a 1.72 d 24.45
2006 2.80 b 0.71 b 2.02 3.38 1.69 2.31 b 1.20 l 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 12.91
Period of Record Statistics
MEAN 2.34 1.84 2.20 2.11 2.61 2.31 1.67 1.53 1.52 1.61 2.26 2.43 23.87
S.D. 1.19 1.04 1.25 0.93 1.27 1.20 1.02 1.02 1.17 0.87 1.43 1.70 4.56
SKEW 0.08 0.75 1.08 0.30 0.32 0.77 0.38 0.99 1.08 -0.04 0.92 1.56 0.57
MAX 4.80 4.37 5.57 3.80 5.15 5.33 3.39 4.37 4.58 3.10 5.82 8.08 33.35
MIN 0.28 0.36 0.50 0.50 0.24 0.66 0.23 0.13 0.24 0.20 0.35 0.13 17.25
NO YRS 26 27 26 25 23 27 26 26 27 22 27 26 18