YELLOWSTONE PARK, WYOMING

Monthly Average Maximum 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 75.10 67.00 a 57.81 29.60 21.29 50.16
1949 14.48 26.00 a 37.94 54.37 62.71 69.66 a 80.29 82.17 a 69.20 46.84 48.70 29.65 51.83
1950 22.84 36.64 36.65 48.50 57.03 69.50 76.13 76.71 64.63 56.35 38.70 36.03 51.64
1951 26.55 36.46 36.00 50.64 e 62.00 61.33 79.10 74.19 65.50 48.13 37.03 25.87 50.23
1952 27.81 32.52 35.35 56.10 61.55 71.53 77.81 76.48 73.42 f 65.23 37.83 32.77 52.27
1953 36.58 33.21 42.68 45.47 54.84 69.38 a ----- z 80.37 a 73.93 61.77 46.07 30.87 a 52.29
1954 31.19 39.18 36.58 51.47 62.94 63.08 e 83.60 a 78.00 70.87 55.29 46.67 31.90 54.23
1955 27.42 27.93 32.32 45.77 60.23 67.83 79.16 83.00 67.03 57.87 32.50 31.35 51.03
1956 32.61 28.04 a 39.94 49.57 63.48 75.67 79.13 76.94 72.27 54.45 37.07 32.23 53.45
1957 20.29 35.25 39.97 47.97 61.23 68.03 81.58 78.77 67.17 53.45 34.73 34.29 51.89
1958 33.74 40.79 37.26 47.03 69.33 a 70.63 76.03 80.58 68.20 60.32 38.33 35.45 54.81
1959 30.00 30.82 39.06 49.57 55.20 a 72.40 80.90 77.77 64.43 52.94 38.47 35.19 52.23
1960 28.74 28.24 41.03 50.47 60.94 73.73 84.26 75.81 70.03 55.47 a 37.87 33.45 53.34
1961 34.52 b 37.44 a 46.89 l 47.88 d 60.74 78.77 h 82.90 80.42 56.77 51.29 37.97 a 27.10 a 51.70
1962 21.07 a 31.89 37.48 53.60 59.17 b 69.67 76.39 77.35 69.83 62.26 43.57 34.96 d 53.10
1963 20.17 b 40.86 41.84 47.43 60.90 a 66.14 b 82.23 a 81.07 a 72.34 a 62.74 41.48 a 32.60 a 54.15
1964 27.97 30.41 34.16 48.87 60.58 65.89 b 84.10 a 75.37 d 68.19 d 61.94 41.00 30.46 e 52.41
1965 33.68 c 33.74 a 33.38 g 49.46 d 58.50 a 68.57 78.65 75.81 59.96 f 63.67 a 45.37 35.76 b 54.32
1966 29.27 a 33.00 c 42.81 47.93 b 67.56 d 69.56 c 84.55 b 76.47 a ----- z ----- z ----- z ----- z 56.39
1967 ----- z 34.40 h 40.39 c 45.96 f 59.55 66.70 82.61 82.74 73.43 54.62 b 41.24 a 24.43 a 58.41
1968 29.65 36.86 45.20 a 45.07 c 57.39 68.73 81.81 71.39 66.10 56.71 37.20 29.19 52.11
1969 30.87 34.04 a 38.77 58.07 a 68.16 66.23 79.06 83.39 72.90 47.97 42.33 35.25 c 54.75
1970 31.48 40.72 c 37.23 41.93 61.13 72.90 80.52 84.19 61.31 a 50.35 40.07 28.76 b 52.55
1971 28.74 31.46 35.41 d 48.22 c ----- z 70.77 79.26 84.71 63.40 50.50 a 38.14 a 26.55 50.65
1972 25.48 35.34 45.90 50.00 61.48 73.03 77.06 78.10 63.62 a 53.81 d 37.40 21.26 51.88
1973 27.19 37.82 41.42 44.87 61.65 71.70 81.03 79.74 65.23 56.94 ----- z 34.92 e 54.77
1974 25.23 31.07 a 36.29 49.00 56.61 76.50 84.00 75.97 70.63 60.58 38.13 28.96 f 54.91
1975 24.55 b 27.30 a 34.65 37.63 53.16 66.40 82.23 73.29 71.40 53.58 35.93 33.39 49.46
1976 31.48 34.21 37.71 51.37 65.39 69.33 c 82.90 76.87 72.00 f 54.77 43.38 a 32.55 52.72
1977 27.39 41.00 d 37.59 d 58.19 d ----- z ----- z ----- z ----- z ----- z 57.45 k ----- z 31.12 f 41.04
1978 ----- z ----- z ----- z 49.21 b 56.84 f 73.27 80.26 76.94 67.57 63.71 j 56.25 z 22.25 z 69.45
1979 17.84 f 32.00 40.39 48.20 61.77 a 71.50 82.81 77.61 74.93 c 57.82 c 34.62 a 34.16 55.98
1980 25.27 a 34.46 a 37.96 g 52.30 c 62.61 c 68.93 b 79.23 73.93 a 67.07 c 55.35 e 41.32 b 36.10 54.23
1981 39.35 33.17 d 44.82 c 49.50 d 58.08 f 63.28 e ----- z ----- z ----- z 50.42 l 46.48 i 31.55 i 46.02
1982 26.81 28.96 38.68 43.03 59.87 p 68.80 75.19 80.97 62.20 o ----- z 34.67 29.23 47.37
1983 35.84 38.07 41.84 46.57 55.81 65.83 74.94 ----- z 64.29 f ----- z 37.27 21.32 46.39
1984 28.13 36.17 39.61 46.21 a 57.19 67.37 79.48 79.77 ----- z ----- z 38.43 ----- z 52.49
1985 28.03 26.82 38.00 52.20 62.09 i 70.24 a 81.39 ----- z 59.60 50.52 27.70 28.39 46.29
1986 36.39 34.71 48.35 49.23 59.68 76.67 74.23 79.29 58.30 55.10 37.73 32.68 53.53
1987 28.35 37.39 41.29 60.57 65.19 72.47 73.81 75.03 71.23 61.00 42.73 29.52 54.88
1988 25.87 34.66 37.39 51.67 62.32 78.00 83.65 80.71 67.17 64.00 37.17 29.29 54.32
1989 28.61 23.07 37.45 51.80 58.48 68.77 84.00 74.97 68.03 50.97 39.43 29.68 51.27
1990 31.13 31.14 41.68 53.77 55.32 69.47 80.06 80.06 75.73 50.77 40.57 18.42 52.34
1991 27.35 41.89 39.81 45.00 56.32 70.40 82.29 82.39 68.40 54.19 33.37 31.84 52.77
1992 32.84 41.31 49.87 55.20 66.13 70.47 71.48 77.74 65.70 57.65 34.40 26.65 54.12
1993 27.81 32.89 43.52 46.53 63.16 65.77 67.48 72.13 66.50 53.84 34.10 32.16 50.49
1994 35.45 29.79 44.68 53.60 66.00 71.23 78.81 83.10 73.60 52.10 32.17 33.32 54.49
1995 31.23 38.25 37.61 47.50 56.35 65.40 75.94 78.97 68.13 48.26 41.21 a 33.39 51.85
1996 27.94 31.90 36.65 48.93 52.61 73.53 82.45 81.35 64.77 54.39 39.17 28.58 51.86
1997 27.42 33.14 40.10 44.20 61.52 71.73 77.19 77.42 69.40 51.10 39.40 30.84 51.95
1998 33.65 36.57 40.55 50.40 62.13 59.67 84.10 82.65 73.93 55.42 39.17 27.87 53.84
1999 33.55 35.75 45.00 47.33 56.48 66.53 81.13 79.74 64.87 59.13 49.37 32.61 54.29
2000 32.90 38.41 42.77 55.07 57.58 70.20 84.58 82.35 65.53 53.13 30.67 29.94 53.59
2001 32.00 30.68 44.19 49.00 65.32 70.03 81.97 84.42 73.90 54.23 44.40 28.45 54.88
2002 27.97 31.82 35.19 48.13 58.48 71.47 85.55 77.03 68.60 48.10 37.67 32.71 51.89
2003 35.29 31.18 40.06 49.70 59.65 70.07 87.16 83.81 68.67 59.77 ----- z 32.87 56.20
2004 30.23 33.21 47.97 55.50 58.19 67.87 79.81 76.77 67.17 57.00 42.23 34.00 54.16
2005 34.87 40.39 43.48 51.73 60.06 67.87 84.10 78.52 68.50 58.35 41.30 28.90 54.84
2006 35.52 ----- z 40.61 52.14 a 65.26 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 48.38
Period of Record Statistics
MEAN 29.47 34.00 40.06 49.66 60.52 69.49 80.19 78.71 68.01 55.49 38.79 30.59 52.88
S.D. 4.68 4.35 3.78 4.14 3.81 3.59 3.78 3.29 4.19 4.59 4.50 4.08 1.45
SKEW -0.55 -0.12 0.47 0.10 0.15 -0.17 -0.92 -0.03 -0.43 0.18 0.03 -1.03 -0.34
MAX 39.35 41.89 49.87 60.57 69.33 78.00 87.16 84.71 75.73 65.23 49.37 36.10 54.88
MIN 14.48 23.07 32.32 37.63 52.61 59.67 67.48 71.39 56.77 46.84 27.70 18.42 49.46
NO YRS 55 55 54 57 52 55 54 54 49 51 52 52 37