LAKE YELLOWSTONE, WYOMING

Monthly Extreme 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 79.00 79.00 65.00 d 44.00 32.00 79.00
1949 28.00 38.00 46.00 57.00 66.00 73.00 80.00 83.00 71.00 b 60.00 e 63.00 38.00 83.00
1950 38.00 47.00 44.00 55.00 60.00 76.00 a 76.00 76.00 83.00 64.00 47.00 40.00 83.00
1951 37.00 46.00 47.00 53.00 d 65.00 b 67.00 80.00 a 77.00 69.00 c 66.00 45.00 37.00 80.00
1952 34.00 40.00 42.00 65.00 64.00 72.00 76.00 75.00 72.00 68.00 49.00 41.00 76.00
1953 43.00 36.00 51.00 58.00 63.00 74.00 79.00 77.00 70.00 o 69.00 51.00 39.00 79.00
1954 39.00 41.00 e 43.00 52.00 72.00 78.00 81.00 78.00 74.00 65.00 53.00 37.00 81.00
1955 30.00 38.00 45.00 54.00 67.00 75.00 e 89.00 80.00 79.00 72.00 45.00 38.00 89.00
1956 38.00 37.00 45.00 55.00 73.00 74.00 89.00 78.00 a 83.00 66.00 47.00 37.00 89.00
1957 30.00 42.00 48.00 64.00 69.00 75.00 b 76.00 80.00 73.00 68.00 a 48.00 38.00 b 80.00
1958 36.00 49.00 47.00 49.00 72.00 79.00 a 75.00 80.00 ----- z 68.00 46.00 a 41.00 80.00
1959 40.00 36.00 45.00 54.00 64.00 76.00 a 81.00 a 80.00 74.00 a 59.00 53.00 43.00 81.00
1960 39.00 33.00 56.00 57.00 67.00 75.00 85.00 80.00 75.00 65.00 51.00 42.00 85.00
1961 38.00 40.00 53.00 52.00 70.00 79.00 a 79.00 84.00 69.00 60.00 50.00 32.00 84.00
1962 44.00 45.00 44.00 63.00 56.00 b 75.00 f 75.00 78.00 72.00 66.00 56.00 45.00 78.00
1963 37.00 49.00 49.00 53.00 65.00 70.00 a 81.00 79.00 76.00 a 72.00 a 46.00 42.00 81.00
1964 41.00 30.00 53.00 56.00 66.00 b 70.00 c 81.00 a 80.00 69.00 68.00 36.00 l 38.00 81.00
1965 31.00 36.00 45.00 50.00 59.00 a 68.00 b 77.00 ----- z 65.00 64.00 56.00 42.00 77.00
1966 35.00 34.00 55.00 52.00 71.00 c 72.00 c 83.00 81.00 c 79.00 e 60.00 d 51.00 b 36.00 83.00
1967 38.00 39.00 55.00 g 47.00 67.00 e 72.00 b 78.00 a 79.00 73.00 58.00 a 49.00 e 36.00 79.00
1968 39.00 45.00 49.00 57.00 66.00 j 74.00 k 79.00 b 78.00 ----- z ----- z 43.00 f 40.00 f 79.00
1969 36.00 40.00 47.00 62.00 71.00 74.00 d 78.00 91.00 76.00 i 55.00 k 52.00 41.00 91.00
1970 40.00 40.00 40.00 50.00 69.00 75.00 y 85.00 b 85.00 a ----- z ----- z 42.00 36.00 a 85.00
1971 41.00 41.00 45.00 54.00 70.00 ----- z 80.00 84.00 a 71.00 l ----- z 50.00 35.00 84.00
1972 34.00 40.00 53.00 53.00 65.00 74.00 80.00 83.00 70.00 59.00 e 41.00 35.00 83.00
1973 38.00 40.00 44.00 51.00 69.00 77.00 80.00 80.00 74.00 64.00 b 50.00 41.00 80.00
1974 44.00 38.00 45.00 57.00 60.00 80.00 82.00 78.00 74.00 65.00 c 47.00 39.00 82.00
1975 35.00 38.00 46.00 46.00 61.00 72.00 82.00 79.00 74.00 66.00 51.00 d 45.00 82.00
1976 39.00 39.00 44.00 48.00 h ----- z 78.00 81.00 b 79.00 b 76.00 e 67.00 52.00 b 36.00 81.00
1977 36.00 43.00 48.00 h ----- z 71.00 o ----- z 88.00 ----- z ----- z ----- z ----- z ----- z 88.00
1978 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 82.00 75.00 d 66.00 b 52.00 32.00 82.00
1979 30.00 b 38.00 b 46.00 53.00 e 65.00 b 78.00 a 81.00 83.00 77.00 68.00 44.00 46.00 83.00
1980 38.00 47.00 43.00 62.00 67.00 73.00 a 81.00 a 79.00 74.00 a 69.00 54.00 43.00 81.00
1981 44.00 44.00 49.00 59.00 63.00 76.00 80.00 80.00 76.00 59.00 54.00 48.00 80.00
1982 35.00 56.00 42.00 54.00 66.00 75.00 78.00 82.00 a 73.00 60.00 42.00 38.00 82.00
1983 36.00 44.00 50.00 c 55.00 68.00 75.00 79.00 82.00 a 77.00 59.00 54.00 31.00 82.00
1984 ----- z 37.00 41.00 58.00 70.00 77.00 79.00 79.00 72.00 63.00 44.00 30.00 79.00
1985 32.00 37.00 46.00 63.00 68.00 78.00 83.00 79.00 66.00 54.00 51.00 35.00 83.00
1986 44.00 48.00 58.00 m 65.00 75.00 ----- z 76.00 80.00 70.00 61.00 46.00 37.00 80.00
1987 39.00 41.00 50.00 65.00 73.00 76.00 79.00 77.00 77.00 72.00 51.00 36.00 n 79.00
1988 38.00 48.00 45.00 63.00 70.00 83.00 85.00 82.00 77.00 70.00 54.00 32.00 85.00
1989 35.00 42.00 51.00 61.00 65.00 l 77.00 83.00 86.00 71.00 69.00 47.00 40.00 86.00
1990 36.00 40.00 49.00 58.00 61.00 79.00 82.00 82.00 78.00 69.00 51.00 44.00 82.00
1991 31.00 45.00 49.00 49.00 61.00 72.00 80.00 81.00 80.00 65.00 44.00 32.00 81.00
1992 42.00 44.00 49.00 62.00 70.00 73.00 76.00 80.00 70.00 70.00 44.00 35.00 80.00
1993 32.00 36.00 49.00 49.00 71.00 70.00 74.00 74.00 72.00 67.00 44.00 41.00 74.00
1994 37.00 43.00 50.00 61.00 68.00 77.00 82.00 82.00 75.00 59.00 42.00 36.00 82.00
1995 37.00 45.00 45.00 48.00 59.00 72.00 78.00 81.00 78.00 56.00 48.00 39.00 81.00
1996 33.00 42.00 46.00 53.00 60.00 78.00 81.00 82.00 77.00 69.00 50.00 ----- z 82.00
1997 35.00 j 38.00 48.00 49.00 60.00 72.00 77.00 79.00 76.00 68.00 52.00 38.00 79.00
1998 39.00 43.00 50.00 60.00 66.00 a 69.00 i 84.00 79.00 80.00 64.00 47.00 43.00 84.00
1999 36.00 44.00 54.00 55.00 66.00 73.00 79.00 j 77.00 m 69.00 j 66.00 n 58.00 b 45.00 79.00
2000 39.00 43.00 55.00 61.00 62.00 o 75.00 n 83.00 o 87.00 80.00 60.00 44.00 37.00 87.00
2001 40.00 38.00 49.00 59.00 75.00 ----- z 82.00 j 84.00 a 81.00 70.00 52.00 35.00 a 84.00
2002 38.00 44.00 49.00 52.00 71.00 80.00 87.00 76.00 77.00 56.00 46.00 i 40.00 87.00
2003 37.00 39.00 51.00 58.00 78.00 74.00 f 92.00 88.00 81.00 68.00 f 42.00 h 34.00 j 92.00
2004 44.00 39.00 61.00 57.00 k 64.00 f 71.00 80.00 i 79.00 73.00 e 63.00 52.00 k 39.00 80.00
2005 46.00 ----- z 54.00 m 57.00 66.00 e 76.00 85.00 78.00 76.00 65.00 h 52.00 g 38.00 85.00
2006 ----- z 42.00 47.00 c 60.00 a 70.00 e 80.00 b 85.00 j ----- z ----- z ----- z ----- z ----- z 85.00
Period of Record Statistics
MEAN 37.33 41.20 47.83 56.02 66.82 74.91 80.73 80.44 74.84 64.60 49.10 38.42 81.88
S.D. 4.08 4.56 4.13 5.09 4.75 3.43 3.87 3.18 4.10 4.58 4.58 4.13 3.13
SKEW -0.12 0.44 0.69 0.04 -0.10 -0.07 0.73 0.89 -0.15 -0.38 0.42 0.07 0.09
MAX 46.00 56.00 61.00 65.00 78.00 83.00 92.00 91.00 83.00 72.00 63.00 48.00 89.00
MIN 28.00 30.00 40.00 46.00 56.00 67.00 74.00 74.00 65.00 54.00 41.00 30.00 74.00
NO YRS 54 56 53 54 51 47 52 55 50 50 51 53 26