OLD FAITHFUL, WYOMING

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(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 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 29.04 g 18.40 a 8.37 -12.32 4.81
1979 -13.71 5.04 5.74 15.37 24.29 30.50 36.71 36.68 27.03 20.13 -2.47 2.48 15.65
1980 -4.29 7.28 6.40 a 13.50 27.67 a 32.86 a 38.39 33.16 29.38 a 16.76 b 10.07 6.68 18.15
1981 0.58 1.50 7.26 18.63 c 26.79 g 33.90 ----- z 33.23 26.80 19.54 c 14.52 a 3.77 15.97
1982 -0.87 -3.30 a 10.16 10.36 b ----- z 32.34 a 40.19 35.67 a 26.53 k 20.29 3.60 2.65 15.11
1983 4.00 6.00 13.97 ----- z 24.04 d 32.33 36.84 39.37 d 28.30 ----- z ----- z ----- z 23.11
1984 ----- z ----- z 9.29 14.24 m 23.13 32.95 j 41.26 38.13 ----- z ----- z 6.43 -6.71 18.59
1985 ----- z -11.57 1.65 19.87 27.61 33.04 c 40.00 33.58 26.88 f 18.68 7.63 -1.68 16.88
1986 2.29 9.50 14.42 20.63 22.94 35.38 a 37.77 36.84 27.64 b 19.84 6.63 -6.58 18.94
1987 -4.61 1.39 9.16 18.37 31.71 34.00 38.10 33.03 26.63 16.32 11.03 -0.55 17.88
1988 -6.16 -0.41 4.06 20.37 27.52 37.37 39.34 b 35.03 29.17 24.71 10.90 -2.23 18.31
1989 -0.48 -2.50 15.65 19.43 29.16 34.53 41.58 38.32 28.47 23.48 10.70 -5.26 19.42
1990 4.26 -2.11 7.13 22.07 27.06 34.57 39.97 38.45 32.47 19.58 12.40 -14.48 18.45
1991 -3.68 6.04 7.45 17.43 27.03 35.63 38.48 39.84 29.60 17.00 3.07 -3.16 17.89
1992 -2.74 6.28 13.84 22.59 a 31.13 35.30 37.06 34.61 28.00 23.03 5.07 -3.19 19.25
1993 -5.94 -4.04 10.77 18.27 29.45 33.83 35.68 33.94 26.37 21.48 0.53 -0.39 16.66
1994 4.42 -0.50 6.48 16.93 31.90 33.97 35.81 36.65 27.57 21.77 -3.07 4.87 18.07
1995 2.32 8.71 10.00 17.20 26.45 33.70 39.52 35.81 27.30 21.19 14.33 -0.16 19.70
1996 -2.03 -2.90 8.42 16.77 28.45 34.73 37.58 34.52 27.80 ----- z 10.10 5.32 18.07
1997 -3.23 -6.68 9.32 11.77 27.55 38.67 38.42 38.23 32.67 22.65 8.13 -5.29 17.68
1998 7.26 3.82 8.45 16.80 28.32 32.60 42.26 38.87 33.63 20.32 17.77 -0.23 20.82
1999 3.90 1.50 2.19 13.87 24.39 32.37 34.58 38.03 24.30 18.87 16.10 1.55 17.64
2000 2.68 8.03 8.19 22.10 31.84 35.00 39.00 38.74 27.87 24.32 -0.20 -1.81 19.65
2001 -6.42 2.50 12.42 21.23 28.90 b 35.80 40.90 b ----- z 30.48 a ----- z 19.69 a 0.90 18.64
2002 2.03 -7.14 7.06 21.10 29.26 36.63 42.26 34.90 30.80 16.94 9.37 2.45 18.81
2003 9.55 -3.31 b 14.81 21.27 ----- z ----- z 40.32 39.77 28.43 24.50 a 5.74 c 6.55 18.76
2004 1.65 0.10 17.16 24.17 30.00 35.70 40.87 36.68 30.83 23.78 d 10.10 8.00 21.59
2005 9.13 -2.96 10.87 18.83 ----- z 34.93 40.52 36.87 30.57 25.32 9.40 1.32 19.53
2006 5.94 -1.11 7.43 a 24.13 29.23 a 35.79 b 42.53 l ----- z ----- z ----- z ----- z ----- z 16.90
Period of Record Statistics
MEAN 0.22 0.71 9.28 18.58 27.88 34.44 38.98 36.50 28.84 20.79 8.37 -0.65 18.59
S.D. 5.42 5.30 3.88 3.57 2.65 1.77 2.07 2.18 2.22 2.74 5.73 5.43 1.40
SKEW -0.39 -0.18 0.14 -0.53 -0.33 0.14 -0.29 -0.12 0.39 0.03 -0.18 -0.71 0.15
MAX 9.55 9.50 17.16 24.17 31.90 38.67 42.26 39.84 33.63 25.32 19.69 8.00 21.59
MIN -13.71 -11.57 1.65 10.36 22.94 30.50 34.58 33.03 24.30 16.32 -3.07 -14.48 15.65
NO YRS 26 27 28 26 24 26 26 26 24 24 27 27 18