LAKE YELLOWSTONE, WYOMING

Monthly Average 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 59.00 47.62 36.56 d 17.05 8.85 33.82
1949 -1.24 10.50 20.90 32.38 41.10 46.78 54.10 54.42 46.16 b 32.73 e 31.45 14.76 32.00
1950 8.29 16.34 17.44 27.32 33.47 44.62 b 50.76 51.56 43.48 37.97 24.42 21.60 31.44
1951 8.71 15.91 15.27 29.15 d 41.07 b 41.63 55.55 b 52.89 43.64 h 32.52 20.78 12.00 29.59
1952 10.27 10.50 13.18 a 31.98 40.74 48.67 51.94 52.74 47.80 g 39.60 19.07 17.74 30.58
1953 22.27 14.45 20.89 24.73 35.10 46.15 57.07 a 54.03 46.60 o 39.84 29.05 14.58 32.56
1954 16.79 17.70 f 16.18 29.53 39.92 43.70 61.81 51.24 46.45 34.87 29.07 14.81 34.94
1955 7.58 9.88 11.68 26.22 37.76 45.28 e 56.26 56.32 45.20 36.32 18.05 15.29 30.49
1956 12.95 4.28 15.71 29.38 41.58 54.40 e 55.91 b 52.78 a 48.07 a 36.08 20.20 15.58 a 32.24
1957 3.23 19.54 18.60 28.88 41.90 47.68 b 55.52 56.10 46.38 36.10 a 19.35 17.55 b 32.57
1958 11.29 20.48 17.50 a 26.32 42.59 c 49.83 f 51.85 56.45 ----- z 37.97 23.41 a 20.55 30.84
1959 13.39 14.77 18.24 29.17 35.94 49.84 a 56.17 a 56.98 44.10 a 35.85 21.55 15.21 32.60
1960 11.42 8.21 22.50 31.18 39.02 49.95 56.74 53.00 48.12 37.00 23.90 15.45 33.04
1961 10.90 20.23 21.94 28.10 40.32 52.57 a 57.05 56.81 40.22 33.95 22.03 10.65 32.90
1962 4.97 17.55 17.82 31.17 39.22 b 48.22 g 52.44 52.15 46.63 40.02 27.25 18.95 31.65
1963 6.10 20.82 19.21 28.12 40.47 46.25 b 53.88 a 54.23 a 49.40 a 40.80 a 25.47 15.65 33.37
1964 8.95 5.93 13.55 29.92 38.09 b 44.42 d 56.27 a 52.10 45.25 37.11 18.53 l 13.66 31.39
1965 11.85 9.64 6.66 30.28 36.03 a 45.23 b 54.34 ----- z 39.07 a 39.23 28.22 17.15 28.88
1966 11.82 9.62 20.16 27.55 41.73 c 46.54 d 57.45 53.95 c 50.58 e 34.23 e 25.96 b 15.56 32.93
1967 16.21 14.05 20.17 g 26.63 36.15 e 46.34 b 56.10 a 55.10 47.78 a 35.62 a 26.00 e 9.82 33.62
1968 10.31 18.17 22.58 25.45 35.92 k 47.66 k 54.74 b 51.26 ----- z ----- z 20.42 f 15.46 f 30.42
1969 14.89 13.05 14.77 32.87 42.47 47.04 e 56.71 59.52 51.14 i 29.08 k 24.95 16.89 32.32
1970 14.89 17.41 17.81 22.73 37.77 56.70 y 56.33 b 56.97 a ----- z ----- z 23.98 13.31 b 29.02
1971 14.35 12.12 16.89 27.13 37.79 ----- z 52.92 58.25 a 44.39 l ----- z 21.58 11.08 28.01
1972 10.23 14.90 23.55 27.37 37.95 47.37 51.26 52.45 39.93 33.60 e 21.68 9.68 30.83
1973 5.87 12.84 18.18 24.83 37.60 46.93 52.79 53.26 44.22 37.72 b 21.50 15.03 30.90
1974 9.94 11.75 19.18 ----- z 33.63 48.83 56.69 51.61 45.08 37.11 c 23.13 12.06 31.73
1975 7.68 10.68 17.95 21.20 33.52 42.75 55.35 49.02 43.25 34.10 17.52 d 17.63 29.22
1976 10.95 13.07 13.08 29.82 h ----- z 45.05 55.07 b 51.31 b 47.12 e 33.95 ----- z ----- z 33.70
1977 5.27 13.66 13.93 h ----- z 35.28 o ----- z 53.55 ----- z ----- z ----- z ----- z ----- z 24.16
1978 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 50.89 44.56 d 37.29 b 21.78 e 4.19 31.74
1979 -2.86 c 14.62 d 20.29 29.78 g 38.00 b 46.36 b 55.69 54.27 48.02 37.00 17.33 17.31 31.46
1980 8.35 17.79 18.40 29.23 40.81 48.53 a 56.62 a 52.60 46.24 a 35.56 25.52 22.05 33.48
1981 18.31 15.70 23.42 30.38 40.03 45.95 54.82 56.13 48.12 33.10 27.10 15.79 34.07
1982 10.23 9.96 20.98 22.43 36.05 45.35 53.45 56.72 a 45.02 32.98 19.40 14.05 30.55
1983 13.21 15.62 21.21 c 26.62 36.52 45.10 52.74 57.02 a 44.37 36.63 22.93 5.85 31.49
1984 ----- z 10.69 20.34 26.62 35.15 44.08 54.63 53.98 40.03 28.19 21.18 6.34 31.02
1985 3.29 2.57 13.92 29.55 40.08 46.17 54.44 48.52 38.12 30.34 15.83 12.90 27.98
1986 16.24 20.39 30.78 m 29.91 a 34.92 ----- z 51.94 54.28 a 40.90 35.10 21.18 13.85 31.87
1987 8.94 17.20 23.53 35.25 45.68 50.95 55.26 51.97 48.07 37.26 25.38 14.56 n 36.32
1988 5.79 13.26 17.03 30.72 41.68 53.95 57.92 54.16 42.67 40.52 20.33 11.56 32.47
1989 8.32 7.34 21.42 29.25 39.97 l 48.18 57.92 52.56 44.03 35.05 b 23.78 13.98 31.08
1990 12.42 11.43 21.56 33.72 36.65 47.15 55.15 54.61 50.67 32.48 24.20 3.27 31.94
1991 6.10 18.34 18.31 27.90 36.27 47.57 55.76 56.11 45.52 33.84 19.35 11.79 31.40
1992 7.95 18.36 25.35 33.83 44.10 47.88 49.87 53.10 42.48 37.47 18.92 10.63 32.50
1993 7.92 9.02 22.26 27.93 39.87 43.90 46.60 49.47 43.30 35.00 16.53 13.34 29.59
1994 14.98 9.71 21.56 29.67 42.10 48.28 53.77 57.11 48.35 34.44 14.32 16.84 32.59
1995 9.61 19.21 19.77 27.70 36.87 44.93 52.10 53.82 46.50 31.58 25.70 14.47 31.86
1996 9.26 11.02 19.29 28.48 34.94 48.62 55.55 b 53.26 42.67 34.66 24.80 ----- z 32.96
1997 10.43 j 9.43 19.85 25.12 38.11 49.87 52.98 54.97 48.62 33.87 22.87 15.60 33.75
1998 18.06 18.36 22.13 31.25 40.32 a 41.55 i 58.08 55.66 50.87 35.53 24.37 11.29 33.27
1999 15.47 14.25 20.65 26.32 34.93 d 44.80 h 53.24 j 55.06 n 44.38 j 39.00 n 31.26 g 15.39 21.17
2000 14.00 19.14 21.52 30.54 g 38.03 o 48.53 n 58.62 o 56.72 d 45.52 e 35.16 f 15.15 14.23 26.61
2001 9.74 12.04 23.58 28.42 40.52 f ----- z 55.90 j 57.70 h 49.12 b 34.23 g 27.48 b 14.03 a 23.49
2002 10.05 8.43 16.98 29.68 37.03 47.82 58.97 52.37 45.88 30.61 21.31 i 17.39 32.29
2003 19.23 11.02 22.66 30.83 39.15 46.96 f 60.26 58.61 45.12 38.28 f 17.39 h 14.43 j 35.86
2004 11.92 13.33 25.56 34.24 k 36.68 f 46.00 52.80 i 51.18 44.06 e 35.03 28.11 k 15.20 c 30.28
2005 16.94 ----- z 22.91 n 29.57 a 37.29 e 44.85 56.24 53.06 44.58 36.17 h 21.59 g 13.02 36.94
2006 ----- z 9.88 20.05 c 32.98 a 39.19 e 50.46 b 58.12 j ----- z ----- z ----- z ----- z ----- z 30.51
Period of Record Statistics
MEAN 10.62 13.43 19.11 28.69 38.57 47.11 54.95 54.05 45.36 35.51 22.49 13.95 31.78
S.D. 4.83 4.33 3.64 2.90 2.84 2.70 2.64 2.53 3.04 2.70 3.91 3.87 1.43
SKEW -0.23 -0.16 -0.88 -0.23 0.17 0.70 -0.34 0.10 -0.37 -0.22 -0.04 -0.62 -0.87
MAX 22.27 20.82 25.56 35.25 45.68 54.40 61.81 59.52 50.87 40.80 31.45 22.05 34.07
MIN -2.86 2.57 6.66 21.20 33.47 41.63 46.60 48.52 38.12 28.19 14.32 3.27 27.98
NO YRS 54 55 53 51 50 45 52 54 48 48 49 52 25