CASTLE ROCK, :

Monthly Extreme Minimum Temperature (Degrees Fahrenheit)

(051401)

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
1893 -3.00 a -2.00 9.00 a 5.00 25.00 31.00 46.00 43.00 29.00 10.00 0.00 -1.00 -3.00
1894 -11.00 -14.00 a 3.00 11.00 30.00 34.00 44.00 35.00 30.00 13.00 13.00 q ----- z -14.00
1895 ----- z ----- z ----- z ----- z 25.00 a 32.00 30.00 40.00 22.00 13.00 0.00 -12.00 -12.00
1896 -6.00 -2.00 -5.00 7.00 28.00 40.00 43.00 36.00 20.00 17.00 -13.00 5.00 -13.00
1897 -21.00 -3.00 0.00 a 0.00 36.00 n 32.00 37.00 42.00 32.00 9.00 5.00 f -12.00 k -21.00
1898 ----- z ----- z -6.00 j 11.00 23.00 35.00 43.00 42.00 28.00 10.00 -8.00 -22.00 -22.00
1899 -11.00 -32.00 -11.00 2.00 31.00 33.00 45.00 38.00 27.00 16.00 13.00 -14.00 -32.00
1900 -9.00 -18.00 7.00 -3.00 28.00 40.00 38.00 35.00 26.00 8.00 8.00 -29.00 -29.00
1901 -22.00 -11.00 0.00 a -4.00 32.00 41.00 49.00 45.00 27.00 25.00 12.00 -17.00 a -22.00
1902 -23.00 -10.00 -5.00 14.00 d 30.00 38.00 36.00 41.00 26.00 21.00 a 2.00 -8.00 -23.00
1903 0.00 -19.00 -8.00 a 6.00 26.00 34.00 32.00 40.00 26.00 4.00 -5.00 -7.00 -19.00
1904 -10.00 -3.00 1.00 14.00 28.00 35.00 a 40.00 37.00 ----- z ----- z ----- z ----- z -10.00
1905 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 30.00 2.00 2.00 a -12.00 -12.00
1906 -16.00 a -5.00 -20.00 16.00 29.00 32.00 6.00 41.00 31.00 12.00 -9.00 a 0.00 a -20.00
1907 -4.00 0.00 6.00 7.00 7.00 31.00 b 43.00 g 40.00 27.00 23.00 c 3.00 a -12.00 -12.00
1908 -12.00 -6.00 5.00 9.00 17.00 34.00 42.00 39.00 13.00 8.00 -8.00 -13.00 -13.00
1909 -7.00 -6.00 -3.00 -8.00 17.00 38.00 44.00 40.00 28.00 ----- z -6.00 -28.00 -28.00
1910 -10.00 -17.00 a 3.00 ----- z 20.00 30.00 43.00 34.00 33.00 ----- z 13.00 q -6.00 -17.00
1911 -31.00 -15.00 6.00 15.00 23.00 36.00 40.00 36.00 31.00 9.00 i ----- z -18.00 -31.00
1912 -17.00 a -15.00 -11.00 12.00 18.00 31.00 42.00 40.00 20.00 19.00 -5.00 -20.00 -20.00
1913 -37.00 -18.00 -19.00 8.00 15.00 ----- z 40.00 42.00 23.00 -5.00 4.00 -19.00 -37.00
1914 -9.00 -32.00 -12.00 14.00 29.00 39.00 44.00 41.00 25.00 18.00 2.00 a -17.00 -32.00
1915 -19.00 2.00 -1.00 20.00 16.00 28.00 43.00 38.00 30.00 21.00 -8.00 -13.00 a -19.00
1916 -22.00 -19.00 3.00 -5.00 12.00 32.00 44.00 40.00 26.00 7.00 -14.00 -19.00 -22.00
1917 -16.00 -14.00 -12.00 6.00 16.00 29.00 42.00 35.00 32.00 -17.00 5.00 -11.00 e -17.00
1918 -22.00 -14.00 a ----- z ----- z 26.00 z 43.00 v 39.00 z 46.00 q ----- z ----- z ----- z ----- z -22.00
1919 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1920 ----- z ----- z ----- z ----- z ----- z 36.00 43.00 38.00 28.00 4.00 2.00 -9.00 -9.00
1921 -7.00 -3.00 -6.00 11.00 26.00 37.00 41.00 41.00 30.00 22.00 a 2.00 -7.00 a -7.00
1922 -18.00 -16.00 -16.00 -1.00 25.00 34.00 45.00 48.00 33.00 18.00 -12.00 3.00 -18.00
1923 2.00 -13.00 a -16.00 18.00 27.00 39.00 46.00 40.00 31.00 4.00 -2.00 -28.00 -28.00
1924 -15.00 5.00 -12.00 8.00 20.00 25.00 46.00 43.00 38.00 19.00 4.00 -27.00 -27.00
1925 -11.00 a ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z -11.00
1926 ----- z ----- z ----- z 19.00 d 28.00 36.00 42.00 41.00 17.00 3.00 2.00 -22.00 -22.00
1927 2.00 -9.00 -20.00 13.00 19.00 38.00 43.00 40.00 27.00 g 23.00 -5.00 -25.00 -25.00
1928 -18.00 -19.00 -6.00 -8.00 a 29.00 35.00 39.00 40.00 29.00 11.00 -9.00 -5.00 -19.00
1929 -14.00 -27.00 -4.00 8.00 23.00 35.00 39.00 ----- z ----- z ----- z ----- z ----- z -27.00
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 ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1942 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1943 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1944 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1945 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1946 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1947 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1948 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1949 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1950 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1951 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1952 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1953 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1954 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1955 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1956 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1957 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1958 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1959 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1960 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1961 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1962 ----- z ----- z ----- z 30.00 m 21.00 34.00 39.00 39.00 30.00 25.00 6.00 -12.00 -12.00
1963 -35.00 -12.00 -9.00 17.00 31.00 38.00 46.00 46.00 36.00 26.00 8.00 -15.00 -35.00
1964 -18.00 -11.00 -7.00 15.00 21.00 35.00 46.00 35.00 29.00 15.00 7.00 -10.00 -18.00
1965 -1.00 -12.00 -14.00 19.00 22.00 36.00 48.00 41.00 22.00 26.00 12.00 -4.00 -14.00
1966 -16.00 -15.00 -2.00 9.00 25.00 38.00 49.00 41.00 31.00 17.00 1.00 -7.00 -16.00
1967 -10.00 -2.00 -5.00 20.00 20.00 38.00 49.00 42.00 32.00 14.00 -6.00 -14.00 -14.00
1968 -12.00 4.00 3.00 0.00 26.00 38.00 44.00 39.00 28.00 13.00 -4.00 -16.00 -16.00
1969 -4.00 5.00 -10.00 24.00 31.00 34.00 49.00 45.00 34.00 -2.00 -1.00 -12.00 -12.00
1970 -18.00 10.00 -3.00 7.00 18.00 34.00 46.00 45.00 24.00 15.00 0.00 4.00 -18.00
1971 18.00 t -7.00 -4.00 13.00 28.00 36.00 40.00 43.00 15.00 4.00 -1.00 -8.00 -8.00
1972 -25.00 -6.00 -3.00 20.00 20.00 41.00 41.00 35.00 31.00 8.00 -5.00 -26.00 -26.00
1973 -15.00 -4.00 5.00 4.00 21.00 30.00 41.00 42.00 27.00 19.00 6.00 -13.00 -15.00
1974 -22.00 -15.00 6.00 11.00 28.00 30.00 44.00 41.00 26.00 21.00 -4.00 -9.00 -22.00
1975 -22.00 -11.00 -6.00 -7.00 b 25.00 28.00 48.00 38.00 24.00 15.00 -14.00 -4.00 -22.00
1976 -16.00 -1.00 -6.00 23.00 a 25.00 31.00 49.00 45.00 ----- z 4.00 -18.00 -2.00 -18.00
1977 -14.00 -2.00 6.00 17.00 a 32.00 b 41.00 a 46.00 37.00 b 33.00 f 18.00 b 0.00 a 2.00 k -14.00
1978 -6.00 b -1.00 c 12.00 j 20.00 l 19.00 a 35.00 a 45.00 h 38.00 d 25.00 a 19.00 a 1.00 a -23.00 a -23.00
1979 -19.00 -3.00 -8.00 5.00 a 25.00 32.00 a 48.00 a 41.00 c 29.00 7.00 -10.00 c -3.00 b -19.00
1980 -2.00 i -10.00 j -5.00 f 10.00 e 31.00 c 34.00 d 48.00 h 42.00 b 39.00 u 13.00 q -1.00 10.00 o -10.00
1981 8.00 c -18.00 5.00 15.00 a 28.00 d 36.00 46.00 b 43.00 b 33.00 a 9.00 4.00 b -10.00 -18.00
1982 -12.00 -29.00 11.00 12.00 23.00 32.00 43.00 48.00 35.00 19.00 -2.00 -12.00 -29.00
1983 0.00 2.00 7.00 -4.00 b 22.00 32.00 42.00 49.00 24.00 25.00 -7.00 -24.00 a -24.00
1984 -22.00 2.00 -10.00 8.00 25.00 36.00 45.00 45.00 18.00 11.00 4.00 a -1.00 c -22.00
1985 -15.00 e ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 24.00 l -4.00 -10.00 -15.00
1986 11.00 -8.00 a 15.00 18.00 30.00 a 37.00 49.00 47.00 31.00 16.00 4.00 3.00 -8.00
1987 -6.00 4.00 0.00 10.00 34.00 41.00 42.00 43.00 35.00 24.00 6.00 -4.00 -6.00
1988 -8.00 6.00 4.00 14.00 22.00 34.00 47.00 45.00 27.00 27.00 8.00 -6.00 -8.00
1989 -2.00 -25.00 -9.00 4.00 30.00 37.00 50.00 44.00 m 31.00 13.00 8.00 -18.00 -25.00
1990 9.00 -6.00 8.00 b 23.00 27.00 40.00 46.00 47.00 39.00 18.00 6.00 -24.00 -24.00
1991 -4.00 10.00 12.00 17.00 27.00 a 42.00 50.00 ----- z ----- z ----- z ----- z ----- z -4.00
1992 ----- z ----- z 5.00 19.00 33.00 34.00 45.00 35.00 30.00 a 17.00 -1.00 -2.00 -2.00
1993 -6.00 -10.00 3.00 18.00 23.00 38.00 42.00 43.00 21.00 -3.00 -10.00 -7.00 -10.00
1994 -13.00 -4.00 5.00 13.00 31.00 39.00 41.00 47.00 23.00 16.00 5.00 -2.00 -13.00
1995 -6.00 -8.00 2.00 8.00 26.00 37.00 42.00 45.00 26.00 18.00 8.00 2.00 -8.00
1996 -12.00 -16.00 -4.00 19.00 32.00 37.00 50.00 45.00 20.00 14.00 4.00 -18.00 -18.00
1997 -12.00 3.00 6.00 -2.00 28.00 42.00 47.00 45.00 37.00 6.00 a -5.00 -1.00 -12.00
1998 2.00 8.00 -8.00 21.00 26.00 32.00 51.00 44.00 36.00 22.00 9.00 -12.00 -12.00
1999 0.00 e 4.00 a 12.00 4.00 a 25.00 s 36.00 g 47.00 a 46.00 23.00 12.00 3.00 -1.00 a -1.00
2000 0.00 7.00 a 15.00 10.00 24.00 a 37.00 a 47.00 a 48.00 23.00 a 25.00 -3.00 a -1.00 -3.00
2001 3.00 b -15.00 9.00 16.00 19.00 34.00 50.00 a ----- z 29.00 a 21.00 a -4.00 4.00 -15.00
2002 -8.00 -8.00 -11.00 18.00 25.00 38.00 50.00 42.00 35.00 13.00 6.00 2.00 -11.00
2003 8.00 -12.00 5.00 19.00 25.00 35.00 50.00 49.00 27.00 21.00 -9.00 1.00 -12.00
2004 -7.00 -14.00 18.00 21.00 20.00 34.00 45.00 37.00 30.00 21.00 -5.00 -12.00 -14.00
2005 -2.00 8.00 4.00 11.00 28.00 34.00 49.00 46.00 34.00 26.00 8.00 -12.00 -12.00
2006 6.00 -14.00 12.00 23.00 21.00 46.00 50.00 44.00 29.00 16.00 -7.00 -3.00 -14.00
2007 -10.00 -14.00 7.00 19.00 32.00 33.00 51.00 50.00 34.00 14.00 3.00 -7.00 -14.00
2008 -10.00 1.00 5.00 16.00 22.00 34.00 50.00 46.00 39.00 19.00 12.00 -11.00 -11.00
2009 -3.00 10.00 9.00 9.00 38.00 37.00 47.00 ----- z ----- z 13.00 3.00 -15.00 -15.00
2010 -7.00 1.00 11.00 21.00 26.00 39.00 47.00 47.00 40.00 20.00 3.00 -1.00 -7.00
2011 -8.00 -16.00 13.00 16.00 27.00 c 42.00 a 50.00 53.00 a 38.00 12.00 8.00 a -9.00 -16.00
2012 -1.00 a 3.00 11.00 27.00 33.00 41.00 b 53.00 a 46.00 d 38.00 c 0.00 11.00 -2.00 -2.00
2013 -7.00 5.00 -4.00 d ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z -7.00
Period of Record Statistics
MEAN -10.18 -7.45 -0.43 11.22 24.98 35.47 44.17 41.94 28.63 14.12 0.00 -10.26 -17.31
S.D. 9.65 10.02 9.03 8.25 5.44 3.80 6.13 4.14 5.73 8.35 6.99 8.74 7.35
SKEW -0.23 -0.27 -0.22 -0.54 -0.50 -0.01 -3.22 0.12 -0.29 -0.93 -0.30 -0.31 -0.41
MAX 11.00 10.00 18.00 27.00 38.00 46.00 53.00 53.00 40.00 27.00 13.00 5.00 -3.00
MIN -37.00 -32.00 -20.00 -8.00 7.00 25.00 6.00 34.00 13.00 -17.00 -18.00 -29.00 -35.00
NO YRS 79 78 77 78 80 81 80 78 76 77 78 78 52