LAKE YELLOWSTONE, WYOMING

Monthly Average Maximum 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 70.19 65.07 52.19 d 26.80 19.65 46.78
1949 14.03 23.07 35.29 48.17 54.10 60.07 71.52 70.65 62.46 b 43.46 e 44.30 24.84 46.00
1950 17.61 29.61 31.45 41.17 46.58 58.97 a 65.74 68.39 56.67 50.00 33.50 30.90 44.22
1951 21.00 29.75 30.29 44.27 d 55.31 b 53.37 69.83 a 65.97 60.33 c 43.45 31.93 21.13 43.89
1952 21.23 27.07 30.71 49.30 53.65 62.57 68.00 68.52 66.67 58.32 32.97 27.74 47.23
1953 29.52 27.43 36.65 40.50 48.61 61.70 74.77 71.29 62.93 o 55.68 40.10 25.35 46.51
1954 25.81 32.96 e 32.29 42.93 55.29 56.77 72.90 67.45 64.47 50.58 41.30 26.81 47.46
1955 20.55 23.25 26.87 39.87 52.10 60.56 e 71.32 74.26 61.13 51.74 28.03 24.74 44.54
1956 24.23 19.07 29.90 43.00 55.32 66.63 72.61 70.23 a 66.53 47.97 33.77 27.97 46.44
1957 17.52 31.79 35.06 43.07 54.16 59.96 b 71.94 72.97 62.53 47.67 a 31.33 28.14 b 46.34
1958 26.48 33.86 34.45 41.17 60.74 63.34 a 66.61 72.55 ----- z 54.13 33.38 a 30.65 47.03
1959 23.68 26.89 33.68 42.33 47.74 65.76 a 73.57 a 71.61 56.66 a 48.06 34.73 29.61 46.19
1960 22.74 23.90 37.74 45.00 52.45 64.57 73.84 69.61 64.80 50.77 34.03 29.32 47.40
1961 27.58 30.50 37.26 40.93 53.90 69.69 a 74.77 72.94 51.23 45.48 35.10 21.19 46.72
1962 20.23 29.79 32.42 46.93 50.38 b 63.08 f 68.42 67.97 63.30 54.03 39.00 30.55 45.73
1963 18.48 35.57 36.29 41.37 53.29 59.45 a 72.52 73.16 65.48 a 56.27 a 35.17 28.29 47.94
1964 21.16 22.93 30.29 43.30 52.28 b 56.22 c 74.03 a 68.65 63.00 52.55 28.61 l 23.48 46.17
1965 23.61 24.86 27.55 42.27 48.40 a 58.29 b 70.06 ----- z 52.00 55.94 38.67 29.48 42.83
1966 23.32 25.54 37.23 41.97 57.64 c 60.44 c 75.52 71.50 c 65.80 e 48.56 d 35.71 b 26.16 47.45
1967 25.39 27.29 32.75 g 38.50 50.00 e 58.57 b 72.30 a 73.13 62.77 46.90 a 36.64 e 22.19 46.70
1968 23.74 32.79 39.77 40.53 49.10 j 63.11 k 72.00 b 64.74 ----- z ----- z 31.21 f 25.64 f 45.60
1969 24.10 26.29 33.55 46.50 59.45 60.04 d 72.06 77.42 67.95 i 40.00 k 37.50 28.39 46.53
1970 24.26 33.39 32.06 36.20 52.23 70.80 y 72.52 b 75.23 a ----- z ----- z 32.93 23.20 a 42.45
1971 23.26 26.68 30.13 42.73 52.68 ----- z 70.10 77.20 a 60.72 l ----- z 33.07 21.16 41.89
1972 20.58 27.45 38.10 41.27 52.23 62.83 69.81 70.74 55.30 46.81 e 31.97 22.48 44.96
1973 20.71 29.82 34.61 40.13 53.68 63.03 70.61 72.52 58.53 52.41 b 30.20 27.29 46.13
1974 21.42 28.04 32.97 42.53 49.03 67.93 74.74 69.97 65.00 52.93 c 35.43 24.90 47.07
1975 20.84 27.04 32.65 37.20 47.58 57.83 73.10 67.74 62.97 46.16 29.23 d 27.26 44.13
1976 23.87 28.03 32.10 41.95 h ----- z 61.70 75.28 b 69.97 b 65.08 e 49.35 37.57 b 28.10 47.10
1977 22.23 33.96 30.65 h ----- z 47.38 o ----- z 73.39 ----- z ----- z ----- z ----- z ----- z 43.19
1978 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 67.32 59.08 d 54.59 b 32.87 17.52 46.27
1979 11.17 b 26.27 b 36.90 43.36 e 51.21 b 61.90 a 73.58 70.23 67.13 52.71 31.50 30.00 46.33
1980 20.94 31.14 33.00 46.73 52.39 61.55 a 71.93 a 66.32 58.31 a 49.97 36.33 32.61 46.77
1981 32.58 28.64 39.26 42.73 50.19 57.37 71.81 75.94 65.57 44.00 38.07 26.65 47.73
1982 20.77 24.00 33.90 37.53 48.97 57.93 66.23 73.40 a 59.07 43.16 30.77 23.74 43.29
1983 24.87 29.82 35.39 c 40.93 49.90 58.00 67.68 72.20 a 59.70 47.55 31.33 18.10 44.62
1984 ----- z 27.38 34.97 41.00 47.97 57.37 71.48 69.58 56.03 41.90 33.13 20.61 45.58
1985 18.94 21.57 33.00 44.13 53.74 63.17 72.58 66.84 53.90 45.45 29.43 24.52 43.94
1986 30.10 30.89 47.61 m 44.00 58.74 ----- z 64.48 70.06 53.17 49.16 33.53 25.84 46.00
1987 21.03 30.79 37.52 50.23 58.52 66.57 68.10 68.26 67.20 55.90 36.33 26.88 n 50.95
1988 20.45 29.59 33.45 46.43 56.26 70.73 77.16 74.10 59.70 57.68 30.33 22.74 48.22
1989 21.29 21.79 34.77 43.80 53.37 l 62.97 75.29 67.90 62.27 46.94 34.80 25.97 45.25
1990 24.13 26.39 38.06 47.13 47.55 60.73 70.90 70.77 68.03 44.81 34.53 16.03 45.76
1991 19.65 34.71 34.23 40.63 47.84 62.10 72.94 72.35 59.97 48.06 29.50 24.39 45.53
1992 22.55 32.24 41.55 46.17 58.13 60.80 63.68 71.03 58.07 50.42 29.23 20.74 46.22
1993 20.90 25.00 38.29 39.90 53.39 55.57 59.87 64.81 59.90 47.58 29.00 25.06 43.27
1994 25.84 25.11 37.81 44.00 54.84 63.03 70.74 75.48 66.23 45.16 26.60 25.97 46.73
1995 21.29 32.46 33.68 40.57 48.58 57.87 67.77 70.29 63.27 42.35 35.60 25.10 44.90
1996 21.52 25.31 33.61 40.83 44.42 65.20 73.48 72.81 56.90 49.03 35.17 ----- z 47.12
1997 22.14 j 25.14 33.97 38.03 50.77 62.37 67.81 70.32 62.40 45.97 34.23 26.52 47.05
1998 27.52 30.14 35.81 44.97 54.30 a 52.76 i 75.03 72.16 66.17 49.26 33.33 22.13 46.44
1999 26.10 27.50 37.58 40.30 48.00 58.20 71.86 j 72.11 m 60.80 j 56.29 n 43.82 b 27.87 38.67
2000 25.94 32.97 38.00 46.40 51.88 o 64.56 n 77.62 o 74.94 61.27 48.84 28.80 25.48 42.51
2001 26.03 25.64 38.97 43.23 56.03 ----- z 73.19 j 76.93 a 66.10 48.39 37.37 24.73 a 44.34
2002 21.77 26.07 30.35 42.47 50.58 62.77 76.45 69.42 61.57 43.23 33.24 i 27.97 46.60
2003 30.77 26.46 34.35 45.13 52.90 62.29 f 79.39 75.61 61.07 54.20 f 28.59 h 25.62 j 50.71
2004 25.16 27.48 40.29 48.53 k 48.20 f 60.63 69.36 i 67.74 59.92 e 47.42 42.95 k 27.10 44.47
2005 30.39 ----- z 40.00 m 44.07 50.58 e 58.13 73.71 69.74 59.00 49.48 h 33.09 g 24.13 51.22
2006 ----- z 25.14 35.11 c 46.03 a 54.15 e 65.36 b 74.33 j ----- z ----- z ----- z ----- z ----- z 45.16
Period of Record Statistics
MEAN 22.98 28.00 34.63 42.85 52.33 61.29 71.46 70.97 61.38 49.22 33.92 25.33 45.91
S.D. 3.94 3.64 3.21 3.02 3.64 3.67 3.63 3.10 4.22 4.20 3.94 3.58 1.43
SKEW -0.07 0.03 -0.15 0.19 0.21 0.45 -0.77 0.16 -0.52 0.31 0.48 -0.43 -0.32
MAX 32.58 35.57 41.55 50.23 60.74 70.73 79.39 77.42 68.03 58.32 44.30 32.61 48.22
MIN 11.17 19.07 26.87 36.20 44.42 53.37 59.87 64.74 51.23 41.90 26.60 16.03 43.27
NO YRS 54 56 53 54 51 47 52 55 50 50 51 53 30