YELLOWSTONE PK MAMMOTH,

Monthly Extreme Maximum Temperature (Degrees Fahrenheit)

(489905)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1894 43.00 41.00 48.00 ----- z ----- z ----- z 90.00 89.00 74.00 73.00 58.00 43.00 90.00
1895 41.00 44.00 44.00 v ----- z 68.00 r 81.00 87.00 87.00 80.00 69.00 56.00 44.00 87.00
1896 48.00 44.00 50.00 60.00 76.00 83.00 88.00 86.00 81.00 a 73.00 50.00 43.00 88.00
1897 ----- z 40.00 42.00 66.00 77.00 83.00 89.00 88.00 81.00 72.00 59.00 37.00 89.00
1898 39.00 45.00 45.00 68.00 73.00 87.00 h 87.00 89.00 85.00 67.00 52.00 37.00 89.00
1899 40.00 43.00 49.00 60.00 71.00 82.00 88.00 83.00 85.00 74.00 57.00 35.00 88.00
1900 37.00 33.00 o 58.00 e 66.00 77.00 92.00 93.00 93.00 82.00 67.00 57.00 44.00 93.00
1901 41.00 42.00 49.00 70.00 78.00 76.00 96.00 88.00 81.00 b 71.00 51.00 41.00 a 96.00
1902 44.00 47.00 44.00 65.00 77.00 84.00 86.00 85.00 78.00 72.00 57.00 45.00 86.00
1903 45.00 40.00 54.00 68.00 76.00 79.00 87.00 90.00 82.00 70.00 60.00 45.00 90.00
1904 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1905 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1906 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1907 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1908 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1909 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1910 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1911 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1912 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1913 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1914 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1915 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1916 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1917 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1918 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1919 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1920 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1921 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1922 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1923 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1924 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1925 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1926 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1927 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1928 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1929 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1930 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1931 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1932 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1933 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1934 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1935 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1936 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1937 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1938 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1939 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1940 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1941 ----- z ----- z ----- z ----- z ----- z 83.00 85.00 91.00 72.00 69.00 52.00 50.00 91.00
1942 49.00 39.00 52.00 69.00 75.00 77.00 91.00 87.00 82.00 76.00 49.00 45.00 91.00
1943 ----- z 51.00 58.00 67.00 75.00 79.00 91.00 87.00 81.00 78.00 55.00 47.00 91.00
1944 45.00 44.00 48.00 62.00 77.00 84.00 83.00 84.00 82.00 74.00 48.00 42.00 84.00
1945 45.00 43.00 56.00 64.00 73.00 83.00 89.00 88.00 84.00 75.00 56.00 43.00 89.00
1946 43.00 49.00 57.00 75.00 77.00 81.00 91.00 90.00 79.00 68.00 47.00 44.00 91.00
1947 37.00 47.00 54.00 66.00 77.00 72.00 89.00 82.00 85.00 65.00 62.00 42.00 89.00
1948 41.00 43.00 48.00 65.00 82.00 82.00 85.00 86.00 81.00 a 73.00 44.00 35.00 86.00
1949 32.00 44.00 a 50.00 65.00 77.00 85.00 a 89.00 95.00 a 82.00 65.00 62.00 43.00 95.00
1950 43.00 54.00 51.00 62.00 73.00 82.00 85.00 88.00 92.00 71.00 56.00 45.00 92.00
1951 40.00 52.00 49.00 64.00 e 73.00 79.00 88.00 89.00 77.00 74.00 50.00 40.00 89.00
1952 40.00 44.00 46.00 73.00 72.00 83.00 91.00 85.00 81.00 f 76.00 55.00 42.00 91.00
1953 48.00 44.00 59.00 68.00 73.00 81.00 a ----- z 89.00 a 86.00 76.00 61.00 41.00 a 89.00
1954 45.00 49.00 48.00 61.00 83.00 85.00 e 94.00 a 92.00 84.00 70.00 59.00 45.00 94.00
1955 36.00 44.00 50.00 65.00 76.00 88.00 94.00 88.00 88.00 72.00 48.00 44.00 94.00
1956 45.00 45.00 a 58.00 65.00 79.00 86.00 90.00 87.00 86.00 76.00 48.00 41.00 90.00
1957 35.00 47.00 50.00 70.00 72.00 80.00 86.00 88.00 77.00 77.00 49.00 43.00 88.00
1958 41.00 55.00 50.00 59.00 79.00 a 85.00 84.00 90.00 84.00 76.00 53.00 48.00 90.00
1959 45.00 45.00 48.00 65.00 77.00 a 87.00 92.00 87.00 84.00 65.00 58.00 49.00 92.00
1960 43.00 40.00 61.00 66.00 79.00 89.00 95.00 87.00 82.00 72.00 a 53.00 50.00 95.00
1961 44.00 b 48.00 a 59.00 l 70.00 d 78.00 90.00 h 89.00 94.00 73.00 70.00 52.00 a 41.00 a 94.00
1962 45.00 a 49.00 49.00 74.00 66.00 b 85.00 85.00 91.00 81.00 74.00 65.00 52.00 d 91.00
1963 48.00 b 54.00 58.00 68.00 72.00 a 81.00 b 89.00 a 91.00 a 84.00 a 77.00 57.00 a 45.00 a 91.00
1964 41.00 39.00 61.00 68.00 78.00 85.00 b 89.00 a 88.00 d 83.00 d 76.00 60.00 41.00 e 89.00
1965 46.00 c 47.00 a 61.00 g 64.00 d 72.00 a 80.00 86.00 89.00 75.00 f 74.00 a 65.00 51.00 b 89.00
1966 43.00 a 46.00 c 63.00 62.00 b 80.00 d 87.00 c 92.00 b 88.00 a ----- z ----- z ----- z ----- z 92.00
1967 ----- z 48.00 h 51.00 c 61.00 f 78.00 81.00 95.00 89.00 90.00 66.00 b 55.00 a 42.00 a 95.00
1968 45.00 48.00 57.00 a 66.00 c 74.00 84.00 89.00 85.00 81.00 79.00 46.00 47.00 89.00
1969 47.00 47.00 a 56.00 72.00 a 78.00 85.00 85.00 91.00 84.00 67.00 55.00 48.00 c 91.00
1970 45.00 49.00 c 47.00 59.00 74.00 90.00 88.00 88.00 82.00 a 75.00 56.00 43.00 b 90.00
1971 44.00 46.00 45.00 d 64.00 c ----- z 88.00 88.00 90.00 79.00 75.00 a 56.00 a 40.00 90.00
1972 39.00 48.00 64.00 67.00 79.00 82.00 88.00 90.00 78.00 a 70.00 d 56.00 40.00 90.00
1973 45.00 50.00 53.00 60.00 77.00 84.00 93.00 88.00 81.00 70.00 ----- z 50.00 e 93.00
1974 50.00 40.00 a 50.00 72.00 71.00 90.00 92.00 85.00 81.00 74.00 49.00 42.00 f 92.00
1975 37.00 b 38.00 a 45.00 52.00 75.00 77.00 90.00 86.00 82.00 76.00 66.00 46.00 90.00
1976 48.00 45.00 53.00 64.00 72.00 85.00 c 93.00 90.00 87.00 f 70.00 59.00 a 42.00 93.00
1977 41.00 53.00 d 56.00 d 72.00 d ----- z ----- z ----- z ----- z ----- z 69.00 k ----- z 45.00 f 72.00
1978 ----- z ----- z ----- z 63.00 b 75.00 f 85.00 89.00 86.00 86.00 73.00 j 61.00 z 32.00 z 89.00
1979 36.00 f 47.00 54.00 63.00 81.00 a 88.00 90.00 93.00 87.00 c 76.00 c 52.00 a 48.00 93.00
1980 43.00 a 49.00 a 48.00 g 71.00 c 77.00 c 82.00 b 90.00 85.00 a 84.00 c 77.00 e 64.00 b 49.00 90.00
1981 49.00 53.00 d 54.00 c 65.00 d 74.00 f 78.00 e ----- z ----- z ----- z 65.00 l 61.00 i 46.00 i 78.00
1982 42.00 45.00 47.00 62.00 74.00 p 84.00 89.00 89.00 83.00 o ----- z 48.00 42.00 89.00
1983 44.00 50.00 57.00 64.00 79.00 79.00 90.00 ----- z 85.00 f ----- z 58.00 37.00 90.00
1984 48.00 47.00 48.00 70.00 a 81.00 89.00 87.00 88.00 ----- z ----- z 48.00 ----- z 89.00
1985 41.00 42.00 52.00 68.00 79.00 i 87.00 a 91.00 ----- z 77.00 67.00 59.00 42.00 91.00
1986 49.00 53.00 64.00 66.00 84.00 87.00 89.00 90.00 84.00 66.00 55.00 42.00 90.00
1987 47.00 53.00 58.00 78.00 85.00 88.00 88.00 85.00 85.00 78.00 62.00 50.00 88.00
1988 44.00 54.00 53.00 72.00 79.00 92.00 93.00 90.00 87.00 75.00 61.00 44.00 93.00
1989 43.00 49.00 59.00 74.00 73.00 83.00 91.00 90.00 80.00 70.00 55.00 48.00 91.00
1990 45.00 45.00 56.00 70.00 71.00 91.00 91.00 92.00 87.00 75.00 60.00 49.00 92.00
1991 37.00 51.00 56.00 61.00 71.00 80.00 89.00 92.00 90.00 77.00 47.00 49.00 92.00
1992 45.00 52.00 60.00 76.00 80.00 88.00 85.00 89.00 78.00 80.00 51.00 44.00 89.00
1993 41.00 47.00 57.00 57.00 78.00 82.00 82.00 82.00 80.00 77.00 52.00 47.00 82.00
1994 49.00 48.00 60.00 74.00 79.00 87.00 91.00 91.00 85.00 68.00 50.00 45.00 91.00
1995 44.00 56.00 52.00 62.00 74.00 81.00 88.00 90.00 88.00 69.00 55.00 a 47.00 90.00
1996 45.00 52.00 52.00 69.00 71.00 84.00 90.00 94.00 82.00 79.00 56.00 43.00 94.00
1997 46.00 45.00 57.00 60.00 77.00 82.00 88.00 90.00 86.00 76.00 61.00 45.00 90.00
1998 43.00 46.00 56.00 68.00 77.00 76.00 94.00 90.00 92.00 72.00 54.00 46.00 94.00
1999 40.00 49.00 66.00 66.00 78.00 82.00 92.00 88.00 80.00 72.00 66.00 51.00 92.00
2000 46.00 45.00 55.00 75.00 70.00 87.00 95.00 96.00 87.00 69.00 42.00 39.00 96.00
2001 42.00 40.00 54.00 70.00 81.00 85.00 93.00 94.00 88.00 77.00 61.00 36.00 94.00
2002 42.00 46.00 55.00 64.00 81.00 90.00 99.00 84.00 85.00 64.00 51.00 45.00 99.00
2003 42.00 46.00 57.00 66.00 86.00 84.00 96.00 97.00 86.00 76.00 ----- z 49.00 97.00
2004 46.00 44.00 65.00 69.00 76.00 81.00 91.00 89.00 86.00 74.00 60.00 45.00 91.00
2005 52.00 55.00 57.00 68.00 73.00 90.00 93.00 92.00 85.00 71.00 54.00 48.00 93.00
2006 49.00 ----- z 56.00 72.00 82.00 88.00 96.00 90.00 89.00 75.00 57.00 46.00 96.00
2007 46.00 52.00 62.00 76.00 82.00 92.00 i 97.00 90.00 90.00 66.00 59.00 45.00 97.00
2008 43.00 49.00 43.00 64.00 78.00 j 89.00 89.00 89.00 83.00 78.00 61.00 40.00 89.00
2009 42.00 43.00 58.00 68.00 78.00 83.00 90.00 90.00 84.00 64.00 60.00 38.00 90.00
2010 42.00 47.00 56.00 72.00 74.00 92.00 94.00 e 89.00 82.00 82.00 65.00 43.00 94.00
2011 47.00 47.00 50.00 57.00 69.00 84.00 89.00 90.00 81.00 80.00 53.00 43.00 90.00
2012 46.00 43.00 65.00 78.00 78.00 88.00 90.00 92.00 81.00 73.00 63.00 45.00 92.00
2013 46.00 46.00 57.00 a ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 57.00
Period of Record Statistics
MEAN 43.57 46.77 53.87 66.74 76.43 84.04 89.91 88.94 83.03 72.69 55.51 44.09 90.85
S.D. 3.74 4.28 5.60 5.14 3.94 4.13 3.37 2.99 4.05 4.31 5.52 3.92 3.13
SKEW -0.49 0.14 0.06 -0.03 -0.01 -0.19 0.19 0.10 -0.20 -0.24 -0.15 -0.22 -0.16
MAX 52.00 56.00 66.00 78.00 86.00 92.00 99.00 97.00 92.00 82.00 66.00 52.00 99.00
MIN 32.00 38.00 42.00 52.00 66.00 72.00 82.00 82.00 72.00 64.00 42.00 35.00 82.00
NO YRS 77 78 77 78 72 77 79 78 73 75 76 76 47