ROCK SPRINGS FAA AP, WYOMING

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 27.3 31.6 40.9 51.0 61.7 73.6 81.5 79.9 68.6 55.6 38.3 29.0 53.3
Highest Mean Max. Temperature (F) 36.1 40.4 47.6 60.3 69.5 82.7 85.9 86.0 74.1 63.8 51.2 39.6 86.0
Year Highest Occurred 1981 1977 1986 1992 1994 1977 1988 1971 1979 1988 1999 1980 1971
Lowest Mean Max. Temperature (F) 12.7 18.8 32.9 43.4 52.8 64.7 75.0 75.6 62.4 47.2 30.2 19.3 12.7
Year Lowest Occurred 1979 1989 1980 1973 1995 1998 1993 1993 1985 1984 2000 1978 1979
Mean Temperature (F) 19.0 22.7 31.6 39.7 49.3 59.6 66.8 65.2 54.9 43.5 28.8 20.2 41.8
Highest Mean Temperature (F) 26.2 30.1 37.6 47.2 55.3 66.3 70.6 69.4 60.5 50.3 38.3 30.1 70.6
Year Highest Occurred 1999 1995 1986 1992 1994 1977 1988 2000 1990 1988 1999 1980 1988
Lowest Mean Temperature (F) 4.0 10.2 25.7 33.3 43.4 53.1 60.9 62.1 49.8 37.2 21.4 11.0 4.0
Year Lowest Occurred 1979 1989 1977 1975 1995 1998 1993 1993 1985 1984 2000 1978 1979
Mean Min. Temperature (F) 10.7 13.8 22.2 28.4 36.8 45.6 52.1 50.5 41.2 31.4 19.3 11.4 30.3
Highest Mean Min. Temperature (F) 18.2 21.3 27.6 34.2 41.5 50.8 56.6 55.6 48.1 36.9 26.8 20.6 56.6
Year Highest Occurred 1994 1995 1992 1992 1992 1988 1985 2000 1998 1988 1995 1980 1985
Lowest Mean Min. Temperature (F) -4.6 1.6 15.9 22.7 32.7 41.0 46.7 45.7 34.9 27.2 12.1 2.7 -4.6
Year Lowest Occurred 1979 1989 1977 1982 1975 1975 1993 1975 1971 1984 1979 1978 1979
Mean Precipitation (in.) 0.61 0.52 0.78 1.02 1.36 0.68 0.93 0.58 0.87 0.87 0.63 0.61 9.46
Highest Precipitation (in.) 1.54 1.23 1.97 2.74 3.67 1.76 3.67 1.66 3.58 2.34 1.60 1.78 3.67
Year Highest Occurred 1978 1978 1977 1999 1995 1993 1973 1997 1973 1994 1983 1975 1995
Lowest Precipitation (in.) 0.04 0.02 0.22 0.04 0.00 0.03 0.04 0.04 0.02 0.00 0.00 0.12 0.00
Year Lowest Occurred 1986 1977 1976 1987 1974 1977 2000 1985 1974 1988 1976 1974 1974
Heating Degree Days (F) 1425. 1184. 1038. 759. 490. 202. 49. 71. 310. 668. 1086. 1388. 8670.
Cooling Degree Days (F) 0. 0. 0. 0. 1. 41. 105. 76. 7. 0. 0. 0. 230.

Western Regional Climate Center, wrcc@dri.edu