OLD FAITHFUL, WYOMING

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 27.0 32.5 39.6 45.8 55.0 65.5 74.5 73.5 62.6 49.9 34.5 26.6 48.9
Highest Mean Max. Temperature (F) 33.9 39.8 47.9 54.6 62.3 74.9 79.9 79.7 71.3 59.0 44.9 32.1 79.9
Year Highest Occurred 1981 1992 1992 1987 1992 1988 1988 1994 1994 1988 1999 1976 1988
Lowest Mean Max. Temperature (F) 16.5 23.4 32.8 34.5 48.7 57.8 64.1 67.5 53.2 43.6 26.9 16.3 16.3
Year Lowest Occurred 1979 1985 1980 1975 1996 1998 1993 1980 1985 1984 1985 1983 1983
Mean Temperature (F) 12.8 16.8 24.1 31.6 41.2 49.9 56.6 55.0 45.5 35.2 21.4 12.5 33.6
Highest Mean Temperature (F) 19.2 24.0 30.9 37.1 46.8 56.2 60.4 59.7 51.5 41.9 30.5 19.0 60.4
Year Highest Occurred 1998 1995 1992 1992 1994 1988 1989 1971 1998 1988 1999 1980 1989
Lowest Mean Temperature (F) 1.0 5.9 18.6 23.5 36.9 45.2 49.9 50.8 40.0 30.0 13.4 0.7 0.7
Year Lowest Occurred 1979 1985 1976 1975 1975 1998 1993 1980 1985 1984 1994 1990 1990
Mean Min. Temperature (F) -1.5 1.0 8.5 17.3 27.3 34.3 38.7 36.5 28.3 20.4 8.2 -1.6 18.1
Highest Mean Min. Temperature (F) 7.3 9.5 15.6 22.6 31.9 38.7 43.4 40.2 33.6 24.7 17.8 6.3 43.4
Year Highest Occurred 1998 1986 1989 1992 1994 1977 1975 1971 1998 1988 1998 1980 1975
Lowest Mean Min. Temperature (F) -14.5 -11.6 0.3 10.4 22.9 31.8 34.6 33.0 24.3 15.2 -3.1 -15.0 -15.0
Year Lowest Occurred 1979 1985 1976 1982 1986 1979 1999 1987 1999 1996 1994 1990 1990
Mean Precipitation (in.) 2.31 2.10 2.14 2.02 2.44 2.14 1.65 1.39 1.58 1.69 2.35 2.59 24.40
Highest Precipitation (in.) 4.80 4.37 5.57 3.80 5.15 5.33 3.39 3.07 4.58 3.85 5.82 8.08 8.08
Year Highest Occurred 1997 1999 1995 1986 1996 1998 1980 1999 1985 1975 1996 1996 1996
Lowest Precipitation (in.) 0.28 0.36 0.74 0.50 0.24 0.66 0.25 0.13 0.16 0.20 0.25 0.13 0.13
Year Lowest Occurred 1992 1991 1984 1989 1983 1996 1988 1982 1974 1987 1976 1986 1982
Heating Degree Days (F) 1621. 1350. 1269. 1003. 740. 453. 266. 313. 586. 926. 1310. 1631. 11468.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 0. 6. 3. 0. 0. 0. 0. 9.

Western Regional Climate Center, wrcc@dri.edu