LAKE YELLOWSTONE, WYOMING

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(485345)

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 47.81 30.17 20.89 c 7.30 -1.94 20.85
1949 -16.52 -2.07 6.52 16.60 28.10 33.50 36.68 38.19 29.27 21.28 b 18.60 4.68 17.90
1950 -1.03 3.07 3.42 13.47 20.35 30.39 b 35.77 34.74 30.30 25.94 15.33 12.29 18.67
1951 -3.58 2.07 0.26 15.90 26.39 29.90 41.00 b 39.81 27.77 h 21.58 9.63 2.87 16.89
1952 -0.68 -6.07 -4.23 a 14.67 27.84 34.77 35.87 36.97 29.83 g 20.87 5.17 7.74 15.72
1953 15.03 1.46 5.13 8.97 21.58 30.60 39.37 a 36.77 30.27 o 24.00 18.00 3.81 18.61
1954 7.77 1.74 e 0.06 16.13 24.55 30.63 50.71 35.03 28.43 19.16 16.83 2.81 19.49
1955 -5.39 -3.50 -3.52 12.57 23.42 30.00 e 41.19 38.39 29.27 20.90 8.07 5.84 16.44
1956 1.68 -10.52 1.52 15.77 27.84 41.44 e 38.59 b 35.23 29.66 a 24.19 6.63 3.23 a 17.94
1957 -11.06 7.29 2.13 14.70 29.65 35.39 b 39.10 39.23 30.23 24.53 a 7.37 6.97 b 18.79
1958 -3.90 7.11 0.83 a 11.47 25.00 c 36.29 f 37.10 40.35 ----- z 21.81 13.45 a 10.45 16.37
1959 3.10 2.64 2.81 16.00 24.13 33.93 a 38.77 a 42.35 31.55 a 23.65 8.37 0.81 19.01
1960 0.10 -7.48 7.26 17.37 25.58 35.33 39.65 36.39 31.43 23.23 13.77 1.58 18.68
1961 -5.77 9.96 6.61 15.27 26.74 35.45 a 39.32 40.68 29.20 22.42 8.97 0.10 19.08
1962 -10.29 5.32 3.23 15.40 28.07 b 33.38 f 36.45 36.32 29.97 26.00 15.50 7.35 17.57
1963 -6.29 6.07 2.13 14.87 27.65 33.43 b 35.20 a 35.23 a 33.31 a 25.33 a 15.77 3.00 18.81
1964 -3.26 -11.07 -3.19 16.53 23.90 b 32.30 c 38.50 a 35.55 27.50 21.68 8.44 l 3.84 16.57
1965 0.10 -5.57 -14.23 18.30 23.67 a 32.18 b 38.61 ----- z 25.79 a 22.52 17.77 4.81 14.90
1966 0.32 -6.29 3.10 13.13 25.82 c 32.67 c 39.39 36.39 c 35.36 e 20.41 d 16.21 b 4.97 18.46
1967 7.03 0.82 7.58 g 14.77 23.11 c 34.11 b 39.90 a 37.06 33.07 a 24.16 13.90 -2.55 20.49
1968 -3.13 3.55 5.39 10.37 22.65 k 32.21 k 37.48 b 37.77 ----- z ----- z 9.62 f 5.28 f 15.24
1969 5.68 -0.18 -4.00 19.23 25.48 34.60 e 41.35 41.61 34.77 h 18.15 k 12.40 5.39 18.16
1970 5.52 1.43 3.55 9.27 23.32 40.90 t 39.73 a 38.70 a ----- z ----- z 15.03 4.17 a 15.64
1971 5.45 -2.43 3.65 11.53 22.90 ----- z 35.74 39.30 a 28.06 l ----- z 10.10 1.00 14.14
1972 -0.13 2.34 9.00 13.47 23.68 31.90 32.71 34.16 24.57 20.38 e 11.40 -3.13 16.70
1973 -8.97 -4.14 1.74 9.53 21.52 30.83 34.97 34.00 29.90 23.03 b 12.80 2.77 15.67
1974 -1.55 -4.54 5.39 ----- z 18.23 29.73 38.65 33.26 25.17 21.29 c 10.83 -0.77 15.97
1975 -5.48 -5.68 3.26 5.20 19.45 27.67 37.61 30.29 23.53 22.03 5.81 d 8.00 14.31
1976 -1.97 -1.90 -5.94 17.68 h ----- z 28.40 34.86 b 32.66 b 29.16 e 18.55 ----- z ----- z 16.73
1977 -11.68 -6.64 -2.78 h ----- z 23.19 o ----- z 33.71 ----- z ----- z ----- z ----- z ----- z 5.13
1978 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 34.45 29.25 b 20.00 b 9.72 e -9.13 16.86
1979 -17.11 c 3.23 b 3.68 15.79 f 24.79 b 31.00 a 37.81 38.32 28.90 21.29 3.17 4.61 16.34
1980 -4.23 4.45 3.81 11.73 29.23 35.52 a 41.30 a 38.87 34.17 a 21.16 14.70 11.48 20.18
1981 4.03 2.75 7.58 18.03 29.87 34.53 37.84 36.32 30.67 22.19 16.13 4.94 20.41
1982 -0.32 -4.07 8.06 7.33 23.13 32.77 40.68 39.84 30.97 22.81 8.03 4.35 17.80
1983 1.55 1.43 7.28 b 12.30 23.13 32.20 37.81 41.97 29.03 25.71 14.53 -6.39 18.38
1984 ----- z -6.00 5.71 12.23 22.32 30.80 37.77 38.39 24.03 14.48 9.23 -7.94 16.46
1985 -12.35 -16.43 -5.16 14.97 26.42 29.17 36.29 30.19 22.33 15.23 2.23 1.29 12.01
1986 2.39 9.89 13.94 m 15.41 a 11.10 ----- z 39.39 38.83 a 28.63 21.03 8.83 1.87 17.74
1987 -3.16 3.61 9.55 20.27 32.84 35.33 42.42 35.68 28.93 18.61 14.43 0.74 19.94
1988 -8.87 -3.07 0.61 15.00 27.10 37.17 38.68 34.23 25.63 23.35 10.33 0.39 16.71
1989 -4.65 -7.11 8.06 14.70 26.35 33.40 40.55 37.23 25.80 23.79 b 12.77 2.00 17.74
1990 0.71 -3.54 5.06 20.30 25.74 33.57 39.39 38.45 33.30 20.16 13.87 -9.48 18.13
1991 -7.45 1.96 2.39 15.17 24.71 33.03 38.58 39.87 31.07 19.61 9.20 -0.81 17.28
1992 -6.65 4.48 9.16 21.50 30.06 34.97 36.06 35.16 26.90 24.52 8.60 0.52 18.77
1993 -5.06 -6.96 6.23 15.97 26.35 32.23 33.32 34.13 26.70 22.42 4.07 1.61 15.92
1994 4.13 -5.68 5.32 15.33 29.35 33.53 36.81 38.74 30.47 23.71 2.03 7.71 18.46
1995 -2.06 5.96 5.87 14.83 25.16 32.00 36.42 37.35 29.73 20.81 15.80 3.84 18.81
1996 -3.00 -3.28 4.97 16.13 25.45 32.03 37.55 b 33.71 28.43 20.29 14.43 ----- z 18.79
1997 -1.29 j -6.29 5.74 12.20 25.45 37.37 38.16 39.61 34.83 21.77 11.50 4.68 20.46
1998 8.61 6.57 8.45 17.53 26.26 30.23 41.13 39.16 35.57 21.81 15.40 0.45 20.93
1999 4.84 1.00 3.71 12.33 21.67 d 31.50 h 34.62 j 38.11 m 27.24 i 21.71 n 17.57 g 2.90 7.74
2000 2.06 5.31 5.03 15.61 g 24.19 o 32.50 n 39.41 n 39.04 d 29.52 e 21.96 f 1.50 2.97 12.20
2001 -6.55 -1.57 8.19 13.60 24.36 f ----- z 38.62 j 38.57 h 31.68 b 20.08 g 17.75 b 3.33 a 9.49
2002 -1.68 -9.21 3.61 16.90 23.48 32.87 41.48 35.32 30.20 18.00 9.38 i 6.81 17.98
2003 7.68 -4.43 10.97 16.53 25.39 31.62 f 41.13 41.61 29.17 22.35 e 6.18 h 3.24 j 21.15
2004 -1.32 -0.83 10.84 19.95 k 25.16 f 31.37 36.23 i 34.61 28.20 e 22.65 11.85 j 3.86 c 16.17
2005 3.48 ----- z 7.12 g 14.76 a 24.00 e 31.57 38.77 36.39 30.17 22.87 h 10.38 f 1.90 22.63
2006 ----- z -5.39 5.00 c 19.93 a 24.19 d 35.57 b 41.90 j ----- z ----- z ----- z ----- z ----- z 15.86
Period of Record Statistics
MEAN -1.74 -1.01 3.61 14.62 24.93 32.86 38.41 37.25 29.40 21.79 11.29 2.61 17.98
S.D. 6.38 5.62 4.69 3.28 3.45 2.59 2.83 3.12 2.96 2.39 4.57 4.49 1.86
SKEW -0.11 -0.19 -1.32 -0.45 -1.08 0.64 1.29 0.40 -0.13 -0.74 -0.42 -0.63 -1.26
MAX 15.03 9.96 10.97 21.50 32.84 41.44 50.71 47.81 35.57 26.00 18.60 12.29 20.93
MIN -17.11 -16.43 -14.23 5.20 11.10 27.67 32.71 30.19 22.33 14.48 1.50 -9.48 12.01
NO YRS 54 56 53 51 51 46 52 54 48 49 49 53 29