YELLOWSTONE PARK, WYOMING

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(489905)

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
1948 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 42.52 35.90 a 26.35 14.07 3.65 24.50
1949 -7.03 7.15 a 15.13 26.66 a 36.00 39.34 a 45.29 46.63 a 36.70 26.13 27.70 12.97 26.06
1950 3.23 17.79 14.23 23.23 26.87 38.87 43.35 42.29 36.37 34.13 21.87 20.06 26.86
1951 6.77 15.15 a 11.61 24.00 e 34.65 35.17 45.42 44.16 34.43 28.32 17.87 8.16 25.48
1952 10.77 11.34 11.65 26.20 31.97 38.52 a 43.87 44.87 37.80 29.55 13.90 15.29 26.31
1953 22.61 13.82 19.61 22.67 30.19 39.55 a ----- z 45.13 38.77 31.16 27.00 12.53 a 27.55
1954 11.90 18.61 13.29 27.80 33.74 37.48 e 46.63 a 42.48 36.67 26.65 24.80 11.23 27.61
1955 6.65 5.75 8.00 24.43 33.03 38.57 46.55 46.74 36.57 29.39 13.23 12.74 25.14
1956 13.26 4.93 a 15.32 24.90 35.90 41.27 45.74 41.23 36.20 29.58 12.53 13.45 26.19
1957 -0.58 15.89 17.71 25.00 37.10 40.90 46.23 44.10 35.33 28.97 15.33 17.84 26.98
1958 12.77 21.14 16.48 25.53 38.17 a 41.23 44.03 44.81 37.63 29.16 19.33 17.35 28.97
1959 12.29 8.32 16.26 24.50 29.77 a 41.33 42.77 41.45 34.73 27.10 13.70 11.81 25.34
1960 10.19 5.10 16.68 23.53 31.61 39.07 46.19 43.16 37.57 30.03 a 20.57 12.74 26.37
1961 12.14 b 21.86 20.75 c 23.65 d 34.39 43.37 46.45 47.26 33.40 27.29 18.34 a 10.10 a 28.25
1962 1.23 a 13.21 15.00 27.87 36.31 b 41.20 43.94 42.84 35.17 31.16 24.10 16.15 d 27.35
1963 -2.07 b 19.86 18.52 25.87 35.30 a 40.89 b 45.73 a 44.20 a 43.38 a 34.45 24.71 b 11.53 a 28.53
1964 11.37 a 8.75 a 13.10 27.20 37.55 41.04 b 46.20 a 40.81 d 32.73 d 27.58 16.93 8.39 c 25.97
1965 13.11 c 11.00 a -0.79 g 26.35 d 30.57 a 39.10 43.16 44.71 30.38 f 30.20 a 23.83 14.24 b 27.63
1966 9.86 b 7.28 c 15.48 20.79 b 30.56 f 38.04 c 45.86 b 41.70 a ----- z ----- z ----- z ----- z 25.57
1967 ----- z 12.83 j 18.32 c 21.96 f 31.68 39.27 47.81 44.90 41.37 31.93 b 20.97 a 6.40 a 31.40
1968 10.00 17.10 22.07 a 22.56 c 32.48 41.40 45.97 a 42.58 38.13 31.87 20.17 12.29 28.05
1969 11.74 15.33 a 11.71 26.93 34.26 40.33 46.71 48.57 a 41.00 24.97 20.57 14.50 e 28.05
1970 11.39 18.00 c 7.16 20.20 34.77 43.40 49.39 48.19 34.72 a 25.45 20.27 12.96 c 27.16
1971 12.81 13.07 13.93 d 25.07 c ----- z 42.43 44.48 50.23 35.50 b 28.50 a 19.17 a 8.26 26.68
1972 8.55 14.93 24.52 28.10 34.84 44.10 44.90 47.87 36.97 a 29.33 d 21.70 6.48 28.52
1973 9.65 14.50 20.10 23.70 33.19 42.27 47.32 47.90 37.47 31.48 ----- z 13.19 e 29.16
1974 8.90 14.96 a 18.70 a 27.50 32.65 43.60 48.68 42.94 32.83 30.65 21.03 10.68 f 29.31
1975 7.90 b 7.85 a 13.81 18.93 32.42 39.13 50.68 44.00 35.47 32.32 17.37 18.68 26.55
1976 14.19 15.76 13.19 28.50 34.39 37.59 c 47.39 40.58 35.75 f 26.94 24.38 a 13.26 26.92
1977 6.39 14.62 d 15.96 d 26.00 d ----- z ----- z ----- z ----- z ----- z 31.10 k ----- z 15.04 f 15.74
1978 ----- z ----- z ----- z 29.89 c 34.19 j 40.03 47.06 44.94 39.97 30.62 j 11.92 f -4.82 i 40.38
1979 -3.17 b 13.04 16.90 27.23 33.97 a 40.86 a 47.90 47.10 40.00 c 31.46 c 11.97 a 16.00 26.94
1980 4.03 a 15.29 a 15.79 g 28.00 c 37.88 f 42.17 a 48.40 a 43.17 a 39.67 c 28.46 e 20.61 b 19.84 28.96
1981 17.81 12.44 c 22.50 c 29.00 d 37.56 f 41.44 e ----- z ----- z ----- z 26.68 l 25.33 i 13.41 i 24.64
1982 5.94 9.50 20.16 20.97 31.79 l 40.57 49.29 49.26 38.07 o ----- z 16.23 13.16 25.01
1983 17.97 18.89 23.42 24.73 32.16 41.60 47.16 ----- z 37.92 f ----- z 23.30 2.97 25.80
1984 11.06 13.83 22.55 26.00 a 34.81 40.60 49.71 49.42 ----- z ----- z 21.00 ----- z 29.89
1985 6.29 3.86 15.61 29.60 37.23 i 43.10 a 49.97 ----- z 35.80 27.77 11.00 10.03 23.30
1986 17.42 18.43 29.00 29.53 34.03 46.17 46.26 46.65 36.10 29.03 18.27 11.10 30.16
1987 9.32 15.93 20.52 29.47 37.26 43.10 46.81 44.10 37.73 28.65 22.70 10.61 28.85
1988 6.52 11.38 17.29 28.73 36.55 48.47 49.06 45.77 37.97 33.48 20.80 10.13 28.85
1989 10.77 0.86 18.29 26.97 35.03 42.13 51.55 46.42 37.03 31.48 22.63 10.13 27.78
1990 15.39 10.50 20.74 29.30 34.35 42.80 48.39 48.03 42.13 29.32 22.73 -0.39 28.61
1991 10.00 21.21 20.13 27.67 34.84 42.77 48.39 49.71 39.07 26.00 16.03 13.48 29.11
1992 13.23 21.00 26.13 31.07 38.35 43.57 44.58 44.61 37.70 32.32 17.07 7.48 29.76
1993 8.19 5.29 22.13 28.27 37.13 40.47 41.71 43.23 35.17 28.71 12.40 13.81 26.37
1994 19.35 8.32 21.97 27.03 39.16 43.13 46.39 48.58 40.03 30.42 11.90 16.71 29.42
1995 12.58 18.14 19.29 27.03 32.42 41.00 48.35 47.00 38.53 26.55 23.00 14.35 29.02
1996 7.32 10.28 15.58 27.60 33.06 43.33 49.35 46.94 36.23 27.74 20.87 14.26 27.71
1997 8.39 11.64 20.16 20.90 35.32 42.50 46.90 45.74 39.97 29.45 17.83 9.94 27.40
1998 15.81 16.18 18.42 26.73 34.65 37.27 50.19 48.58 43.27 28.58 24.73 10.19 29.55
1999 16.00 14.64 17.19 21.40 32.45 40.67 45.84 47.55 34.03 30.06 27.17 15.13 28.51
2000 13.55 18.31 19.35 26.87 35.13 41.90 47.58 49.10 37.13 30.19 9.33 9.03 28.12
2001 7.73 a 7.21 19.29 26.20 35.26 42.83 49.35 46.00 a 42.00 29.20 a 24.70 9.32 28.26
2002 8.84 7.46 7.94 23.23 31.00 42.27 49.00 41.00 38.50 22.65 16.50 15.65 25.34
2003 17.10 7.29 19.23 27.87 34.71 40.87 50.58 50.39 35.23 29.90 ----- z 13.42 29.69
2004 9.74 10.76 23.32 27.13 32.87 39.87 46.23 43.29 36.33 32.68 21.80 19.06 28.59
2005 15.23 13.39 20.52 28.17 35.68 41.90 51.45 46.90 40.07 33.90 21.37 11.74 30.03
2006 18.58 ----- z 20.48 30.03 36.03 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 26.28
Period of Record Statistics
MEAN 10.20 12.88 17.75 26.04 34.20 41.18 47.00 45.41 37.45 29.39 19.45 12.18 27.70
S.D. 5.66 5.04 4.41 2.76 2.39 2.24 2.26 2.68 2.57 2.48 4.53 4.16 1.38
SKEW -0.66 -0.21 -0.21 -0.61 -0.44 0.22 -0.06 0.01 0.43 -0.12 -0.33 -0.54 -0.17
MAX 22.61 21.86 29.00 31.07 39.16 48.47 51.55 50.39 43.38 34.45 27.70 20.06 30.16
MIN -7.03 0.86 7.16 18.93 26.87 35.17 41.71 40.58 32.73 22.65 9.33 -0.39 25.14
NO YRS 56 55 55 57 50 56 54 54 50 51 52 52 40