OLD FAITHFUL, WYOMING

Monthly Average 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 45.17 i 36.34 b 21.28 2.95 20.19
1979 2.11 17.30 22.27 29.05 39.65 48.08 55.95 a 53.18 48.15 36.35 15.38 17.79 32.11
1980 10.71 21.10 19.65 a 31.37 40.45 b 47.98 b 55.73 50.23 a 45.25 b 32.69 e 23.20 19.79 33.18
1981 17.95 16.79 24.47 32.42 d 39.00 h 46.84 a ----- z 55.05 46.95 33.71 e 26.97 a 15.89 31.70
1982 11.10 a 10.98 a 22.48 a 26.05 j ----- z 47.60 a 54.82 c 54.73 e 42.04 q 32.55 c 16.92 13.79 b 29.44
1983 17.40 19.66 25.56 ----- z 38.86 f 46.67 53.77 56.69 d 44.97 ----- z ----- z ----- z 37.82
1984 ----- z ----- z 23.27 30.06 m 38.05 46.47 j 58.97 57.21 ----- z ----- z 19.80 8.11 34.24
1985 ----- z 5.46 a 18.06 33.55 43.06 49.38 d 57.77 51.34 39.93 g 33.16 16.95 12.15 32.09
1986 17.13 20.25 28.66 33.08 38.60 52.62 b 53.40 55.45 41.80 b 35.68 20.07 12.08 34.07
1987 11.31 18.89 24.06 36.92 45.74 50.64 a 54.37 51.44 47.77 37.32 27.22 15.29 35.08
1988 11.90 20.38 24.08 34.50 42.84 56.00 59.66 c 55.47 46.35 42.34 21.88 12.92 35.69
1989 14.37 13.96 30.11 32.59 a 41.85 49.10 60.26 54.32 46.42 36.81 25.30 10.87 34.66
1990 15.95 13.05 24.29 36.30 39.15 49.55 57.65 56.42 51.70 33.24 24.58 1.73 33.63
1991 11.00 23.66 23.37 31.20 40.18 50.57 56.79 58.31 46.95 33.92 18.05 12.45 33.87
1992 13.94 23.97 31.66 37.69 a 46.76 50.67 52.42 54.48 44.50 38.37 17.88 9.71 35.17
1993 11.15 14.39 27.79 31.95 44.71 47.28 49.90 52.19 45.20 35.40 a 16.07 13.53 32.46
1994 17.82 15.20 26.71 33.73 46.77 50.87 56.65 58.19 49.42 34.68 13.35 17.24 35.05
1995 15.76 23.96 24.82 31.78 39.82 48.43 56.15 55.52 46.68 33.98 25.97 14.97 34.82
1996 12.45 14.47 22.24 30.15 38.58 52.17 56.89 54.37 43.03 ----- z 23.83 15.53 33.06
1997 11.79 11.80 22.90 26.12 41.66 52.57 55.26 55.48 48.50 35.32 22.88 10.82 a 32.93
1998 19.11 18.34 22.63 31.57 42.44 45.20 60.11 57.26 51.47 36.21 26.27 13.52 a 35.34
1999 16.29 16.43 21.84 28.80 38.47 48.15 55.23 57.55 43.53 37.32 30.50 15.18 34.11
2000 15.19 21.64 23.05 35.32 42.61 49.98 57.60 57.29 44.38 36.79 14.13 12.53 34.21
2001 11.98 14.80 25.97 32.05 43.34 b 50.17 58.52 b ----- z 49.10 a ----- z 30.26 a 13.05 32.92
2002 12.68 10.59 18.90 32.37 41.39 50.87 60.68 52.87 47.02 30.85 21.27 15.82 32.94
2003 21.06 12.44 b 24.94 33.17 ----- z ----- z 60.42 58.48 45.27 40.07 a 16.72 c 17.71 33.03
2004 14.39 14.31 28.76 36.45 40.76 49.43 56.77 53.15 45.32 36.54 d 24.03 18.32 34.85
2005 19.24 15.00 24.16 31.40 ----- z 47.63 57.97 54.65 45.62 38.61 22.40 13.39 33.64
2006 16.37 12.48 21.03 a 35.30 43.47 a 51.95 b 59.53 l ----- z ----- z ----- z ----- z ----- z 30.10
Period of Record Statistics
MEAN 14.24 16.35 24.21 32.75 41.75 49.63 56.68 55.05 46.47 35.76 21.60 13.23 34.12
S.D. 3.88 4.55 3.20 2.71 2.61 2.33 2.64 2.28 2.44 2.59 4.75 4.15 1.06
SKEW -0.88 -0.08 0.37 -0.23 0.43 0.55 -0.50 -0.34 0.40 0.46 0.06 -1.14 -0.37
MAX 21.06 23.97 31.66 37.69 46.77 56.00 60.68 58.48 51.70 42.34 30.50 19.79 35.69
MIN 2.11 5.46 18.06 26.12 38.05 45.20 49.90 50.23 41.80 30.85 13.35 1.73 32.11
NO YRS 26 27 28 25 23 26 26 26 24 24 27 27 18