YELLOWSTONE PARK, WYOMING

Monthly Average 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 58.81 51.45 a 42.08 21.83 12.47 37.33
1949 3.73 16.57 a 26.53 40.33 a 49.35 54.50 a 62.79 64.40 a 52.95 36.48 38.20 21.31 38.93
1950 13.03 27.21 25.44 35.87 41.95 54.18 59.74 59.50 50.50 45.24 30.28 28.05 39.25
1951 16.66 25.72 a 23.81 37.32 e 48.32 48.25 62.26 59.18 49.97 38.23 27.45 17.02 37.85
1952 19.29 21.93 23.50 41.15 46.76 54.90 a 60.84 60.68 54.92 f 47.39 25.87 24.03 38.76
1953 29.60 23.52 31.15 34.07 42.52 54.47 a ----- z 62.75 a 56.35 46.47 36.53 21.70 a 39.92
1954 21.55 28.89 24.94 39.63 48.34 50.28 e 65.12 a 60.24 53.77 40.97 35.73 21.56 40.92
1955 17.03 16.84 20.16 35.10 46.63 53.20 62.85 64.87 51.80 43.63 22.87 22.05 38.09
1956 22.94 16.48 a 27.63 37.23 49.69 58.47 62.44 59.08 54.23 42.02 24.80 22.84 39.82
1957 9.85 25.57 28.84 36.48 49.16 54.47 63.90 61.44 51.25 41.21 25.03 26.06 39.44
1958 23.26 30.96 26.87 36.28 53.75 a 55.93 60.03 62.69 52.92 44.74 28.83 26.40 41.89
1959 21.15 19.57 27.66 37.03 42.48 a 56.87 61.84 59.61 49.58 40.02 26.08 23.50 38.78
1960 19.47 16.67 28.85 37.00 46.27 56.40 65.23 59.48 53.80 42.75 a 29.22 23.10 39.85
1961 23.33 b 29.72 a 35.34 l 35.77 d 47.56 61.30 h 64.68 63.84 45.08 39.29 28.16 a 18.60 a 39.60
1962 11.15 a 22.55 26.24 40.73 47.74 b 55.43 60.16 60.10 52.50 46.71 33.83 25.56 d 40.23
1963 9.05 b 30.36 30.18 36.65 48.10 a 53.52 b 63.98 a 62.63 a 57.86 a 48.60 33.11 b 22.07 a 41.34
1964 19.65 a 19.57 a 23.63 38.03 49.06 53.46 b 65.15 a 58.09 d 50.46 d 44.76 28.97 20.21 g 40.99
1965 23.39 c 22.81 b 16.50 h 37.90 d 44.53 a 53.83 60.90 60.26 45.24 g 46.93 a 34.60 25.00 b 41.02
1966 19.79 b 20.14 c 29.15 34.36 b 49.38 g 53.80 c 65.21 b 59.08 a ----- z ----- z ----- z ----- z 40.22
1967 ----- z 22.97 j 30.09 d 33.96 f 45.61 52.98 65.21 63.82 57.40 43.28 b 31.10 a 15.42 a 44.99
1968 19.82 26.98 33.63 a 33.81 c 44.94 55.07 63.88 a 56.98 52.12 44.29 28.68 20.74 40.08
1969 21.31 24.69 a 25.24 42.71 a 51.21 53.28 62.89 66.03 a 56.95 36.47 31.45 25.08 e 41.44
1970 21.44 29.36 c 22.19 31.07 47.95 58.15 64.95 66.19 48.02 a 37.90 30.17 20.86 c 39.85
1971 20.77 22.27 24.67 d 36.65 c ----- z 56.60 61.87 67.47 49.46 b 39.50 a 28.66 a 17.40 38.67
1972 17.02 25.14 35.21 39.05 48.16 58.57 60.98 62.98 50.29 a 41.57 d 29.55 13.87 40.20
1973 18.42 26.16 30.76 34.28 47.42 56.98 64.18 63.82 51.35 44.21 ----- z 24.06 e 41.97
1974 17.06 23.02 a 27.67 a 38.25 44.63 60.05 66.34 59.45 51.73 45.61 29.58 19.82 f 42.13
1975 16.22 b 17.57 a 24.23 28.28 42.79 52.77 66.45 58.65 53.43 42.95 26.65 26.03 38.00
1976 22.84 24.98 25.45 39.93 49.89 53.46 c 65.15 58.73 53.88 f 40.85 33.88 a 22.90 39.82
1977 16.89 27.81 d 26.78 d 42.10 d ----- z ----- z ----- z ----- z ----- z 44.28 k ----- z 23.08 f 28.39
1978 ----- z ----- z ----- z 39.46 c 44.76 j 56.65 63.66 60.94 53.77 47.17 j 41.17 z 7.25 z 54.90
1979 7.56 g 22.52 28.65 37.72 47.87 a 55.90 a 65.35 62.35 57.46 c 44.64 c 23.29 a 25.08 42.80
1980 14.65 a 24.88 a 26.88 g 40.15 c 50.75 g 55.54 b 63.85 a 58.55 a 53.77 d 41.60 f 30.96 b 27.97 41.15
1981 28.58 22.69 d 33.66 c 39.25 d 47.82 f 52.36 e ----- z ----- z ----- z 37.81 o 35.90 i 22.48 i 35.31
1982 16.37 19.23 29.42 32.00 46.67 p 54.68 62.24 65.11 50.13 o ----- z 25.45 21.19 36.19
1983 26.90 28.48 32.63 35.65 43.98 53.72 61.05 ----- z 51.10 f ----- z 30.28 12.15 36.09
1984 19.60 25.00 31.08 36.10 a 46.00 53.98 64.60 64.60 ----- z ----- z 29.72 ----- z 41.19
1985 17.16 15.34 26.81 40.90 49.66 i 56.67 a 65.68 ----- z 47.70 39.15 19.35 19.21 34.80
1986 26.90 26.57 38.68 39.38 46.85 61.42 60.24 62.97 47.20 42.06 28.00 21.89 41.85
1987 18.84 26.66 30.90 45.02 51.23 57.78 60.31 59.56 54.48 44.82 32.72 20.06 41.87
1988 16.19 23.02 27.34 40.20 49.44 63.23 66.35 63.24 52.57 48.74 28.98 19.71 41.58
1989 19.69 11.96 27.87 39.38 46.76 55.45 67.77 60.69 52.53 41.23 31.03 19.90 39.52
1990 23.26 20.82 31.21 41.53 44.84 56.13 64.23 64.05 58.93 40.05 31.65 9.02 40.48
1991 18.68 31.55 29.97 36.33 45.58 56.58 65.34 66.05 53.73 40.10 24.70 22.66 40.94
1992 23.03 31.16 38.00 43.13 52.24 57.02 58.03 61.18 51.70 44.98 25.73 17.06 41.94
1993 18.00 19.09 32.82 37.40 50.15 53.12 54.60 57.68 50.83 41.27 23.25 22.98 38.43
1994 27.40 19.05 33.32 40.32 52.58 57.18 62.60 65.84 56.82 41.26 22.03 25.02 41.95
1995 21.90 28.20 28.45 37.27 44.39 53.20 62.15 62.98 53.33 37.40 32.17 a 23.87 40.44
1996 17.63 21.09 26.11 38.27 42.84 58.43 65.90 64.15 50.50 41.06 30.02 21.42 39.78
1997 17.90 22.39 30.13 32.55 48.42 57.12 62.05 61.58 54.68 40.27 28.62 20.39 39.68
1998 24.73 26.38 29.48 38.57 48.39 48.47 67.15 65.61 58.60 42.00 31.95 19.03 41.70
1999 24.77 25.20 31.10 34.37 44.47 53.60 63.48 63.65 49.45 44.60 38.27 23.87 41.40
2000 23.23 28.36 31.06 40.97 46.35 56.05 66.08 65.73 51.33 41.66 20.00 19.48 40.86
2001 19.82 a 18.95 31.74 37.60 50.29 56.43 65.66 65.20 a 57.95 41.63 a 34.55 18.89 41.56
2002 18.40 19.64 21.56 35.68 44.74 56.87 67.27 59.02 53.55 35.37 27.08 24.18 38.61
2003 26.19 19.23 29.65 38.78 47.18 55.47 68.87 67.10 51.95 44.84 ----- z 23.15 42.95
2004 19.98 21.98 35.65 41.32 45.53 53.87 63.02 60.03 51.75 44.84 32.02 26.53 41.38
2005 25.05 26.89 32.00 39.95 47.87 54.88 67.77 62.71 54.28 46.13 31.33 20.32 42.43
2006 27.05 ----- z 30.55 40.98 a 50.65 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 37.31
Period of Record Statistics
MEAN 19.96 23.44 28.89 37.85 47.27 55.30 63.60 62.06 52.74 42.45 29.12 21.43 40.34
S.D. 4.96 4.54 3.91 3.13 2.77 2.67 2.67 2.76 3.06 3.17 4.34 4.02 1.30
SKEW -0.65 -0.21 0.17 -0.48 0.09 0.08 -0.70 0.12 0.06 -0.12 -0.12 -0.93 -0.31
MAX 29.60 31.55 38.68 45.02 53.75 63.23 68.87 67.47 58.93 48.74 38.27 28.05 42.43
MIN 3.73 11.96 20.16 28.28 41.95 48.25 54.60 56.98 45.08 35.37 19.35 9.02 37.85
NO YRS 55 55 54 57 50 55 54 54 49 50 52 51 36