ROCK SPRINGS FAA AP, WYOMING

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 29.5 34.3 41.8 52.7 63.7 74.6 83.1 80.8 70.0 57.2 40.7 30.8 54.9
Highest Mean Max. Temperature (F) 39.2 44.2 50.8 62.4 72.4 84.5 87.7 87.4 76.5 65.8 47.0 41.8 58.6
Year Highest Occurred 1981 1977 1986 1987 1969 1977 1988 1971 1969 1988 1976 1980 1977
Lowest Mean Max. Temperature (F) 15.8 21.9 31.6 45.2 56.9 66.9 77.8 75.5 58.3 46.4 32.9 21.5 50.8
Year Lowest Occurred 1979 1989 1964 1964 1965 1965 1965 1965 1965 1969 1985 1978 1964
Mean Temperature (F) 20.4 24.3 31.3 40.6 50.3 60.2 68.0 65.8 55.5 44.3 30.4 21.4 42.7
Highest Mean Temperature (F) 27.3 30.8 39.7 47.4 56.2 67.5 72.1 70.4 62.0 51.7 35.4 32.2 44.8
Year Highest Occurred 1981 1977 1986 1987 1969 1988 1988 1969 1990 1988 1966 1980 1981
Lowest Mean Temperature (F) 6.8 12.3 22.0 35.0 46.0 55.4 65.0 61.4 46.8 36.0 23.4 12.6 40.2
Year Lowest Occurred 1979 1989 1964 1975 1965 1969 1986 1968 1965 1969 1979 1978 1964
Mean Min. Temperature (F) 11.1 14.3 20.7 28.4 36.8 45.7 52.8 50.7 41.0 31.3 20.0 11.9 30.4
Highest Mean Min. Temperature (F) 18.7 20.9 28.5 34.0 41.8 51.9 57.7 55.5 47.9 38.8 26.3 22.5 32.8
Year Highest Occurred 1971 1986 1986 1985 1985 1988 1985 1983 1990 1963 1965 1980 1981
Lowest Mean Min. Temperature (F) -2.3 2.6 11.4 22.9 32.5 40.8 49.1 46.1 34.4 25.5 13.4 3.6 28.3
Year Lowest Occurred 1979 1989 1965 1975 1975 1975 1972 1975 1970 1969 1979 1978 1973
Mean Precipitation (in.) 0.53 0.55 0.78 1.01 1.14 0.95 0.91 0.71 0.90 0.75 0.58 0.63 9.44
Highest Precipitation (in.) 1.54 1.26 1.97 2.45 3.56 3.49 3.67 3.12 3.67 2.05 1.60 1.78 14.54
Year Highest Occurred 1978 1962 1977 1968 1971 1969 1973 1963 1965 1971 1983 1975 1965
Lowest Precipitation (in.) 0.04 0.02 0.22 0.04 0.00 0.03 0.13 0.04 0.02 0.00 0.00 0.00 4.53
Year Lowest Occurred 1986 1977 1976 1987 1974 1977 1988 1985 1974 1988 1976 1962 1988
Heating Degree Days (F) 1383. 1140. 1045. 732. 456. 186. 22. 66. 303. 642. 1038. 1352. 8365.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 42. 115. 91. 18. 0. 0. 0. 266.

Western Regional Climate Center, wrcc@dri.edu