Boulder, CO Monthly Means: Minimum Temperature

Units are degrees Fahrenheit

YearJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
1893 Miss Miss Miss Miss Miss Miss Miss Miss Miss 39.1 28.3 28.2
1894 20.0 16.8 30.4 39.1 Miss Miss 56.5 55.4 Miss Miss Miss 21.5
1895 15.8 12.2 24.1 38.0 42.9 47.5 Miss Miss Miss Miss Miss Miss
1896 Miss Miss Miss Miss Miss Miss Miss Miss Miss Miss Miss Miss
1897 Miss Miss Miss Miss 51.0 55.3 60.1 59.8 58.0 42.9 32.6 21.2
1898 21.5 29.4 25.8 38.6 43.0 56.2 62.3 61.8 50.5 37.7 26.0 19.4
1899 21.7 7.6 22.3 35.7 43.5 52.9 57.1 57.7 53.6 39.6 36.8 24.6
1900 25.0 19.3 30.2 35.4 48.1 57.2 58.9 59.8 50.0 45.0 31.3 27.3
1901 23.7 18.0 28.2 35.6 48.2 53.7 62.7 59.3 48.0 39.8 34.6 23.3
1902 21.1 26.2 28.4 36.5 47.8 53.8 57.0 59.5 46.9 44.3 30.1 25.0
1903 25.2 12.6 26.3 36.6 43.0 51.1 59.4 58.5 48.4 42.4 29.5 27.7
1904 21.1 28.6 29.9 37.3 44.0 50.4 56.0 57.4 52.2 42.5 35.8 26.6
1905 19.5 16.1 34.3 36.4 41.7 54.7 56.7 59.9 52.8 36.9 33.4 25.4
1906 27.7 25.0 20.5 38.5 45.5 51.0 56.8 57.3 50.8 39.2 28.3 30.7
1907 22.4 30.8 35.7 34.8 41.0 52.4 58.0 59.0 52.2 42.3 29.4 26.4
1908 26.5 25.6 34.2 39.2 42.1 51.6 57.8 56.5 53.8 38.3 30.5 23.5
1909 26.0 25.7 25.8 32.5 41.0 53.4 59.1 60.4 50.1 44.6 34.7 10.0
1910 19.0 17.6 43.4 43.1 44.4 53.6 Miss Miss 48.4 38.6 32.7 23.8
1911 25.2 18.8 31.7 35.7 44.6 55.2 56.5 54.5 49.9 34.5 23.1 Miss
1912 Miss Miss 20.3 34.2 43.6 51.2 56.0 56.4 42.2 37.1 28.9 18.6
1913 16.9 12.2 22.8 35.8 44.5 52.6 57.0 59.3 47.0 35.0 32.4 14.2
1914 24.5 17.2 27.2 35.9 45.5 54.6 58.1 57.3 50.5 41.3 32.8 13.1
1915 17.0 24.6 22.7 41.0 41.7 50.0 55.1 53.5 48.3 40.5 32.3 19.9
1916 11.8 23.1 35.0 38.8 46.0 57.1 66.0 59.8 50.9 37.9 27.4 17.1
1917 18.8 24.4 22.4 33.6 40.5 54.8 63.1 59.0 52.7 34.5 35.8 26.2
1918 16.5 24.1 34.7 33.0 48.8 58.2 62.7 64.4 49.9 43.6 25.9 22.1
1919 25.1 19.9 28.5 37.7 45.0 53.3 66.0 65.8 58.0 40.2 21.1 15.0
1920 20.1 20.7 25.4 28.2 42.6 50.6 55.9 53.7 46.6 38.1 23.4 21.0
1921 22.6 24.6 31.4 33.2 43.6 53.5 56.8 56.8 48.0 41.7 29.6 22.8
1922 12.7 18.5 26.3 33.0 44.2 55.7 57.8 58.5 51.9 38.4 26.1 22.7
1923 27.0 16.3 21.5 34.7 43.1 51.4 58.0 54.5 46.8 33.9 29.8 19.7
1924 18.2 29.6 20.3 34.8 42.1 53.8 59.8 61.8 44.9 37.4 29.0 11.4
1925 17.1 26.8 28.4 38.1 46.5 52.5 60.2 56.2 49.5 32.0 29.2 21.7
1926 21.9 28.1 28.1 36.5 46.8 53.5 57.5 57.1 47.0 38.1 30.1 15.4
1927 21.6 25.0 22.8 35.0 43.1 49.4 54.0 51.7 45.7 38.2 29.9 12.5
1928 23.1 19.7 26.7 31.0 43.8 46.5 54.2 53.8 45.5 37.6 23.0 18.9
1929 13.7 10.1 28.3 34.4 41.8 51.4 58.9 58.2 44.8 38.4 19.3 23.4
1930 3.5 28.8 24.5 41.5 42.5 53.8 58.9 56.7 47.6 35.9 27.9 19.4
1931 22.6 26.0 24.5 35.0 41.7 55.2 59.1 57.1 50.4 40.4 24.4 22.5
1932 14.8 26.0 19.6 34.9 44.6 50.2 57.7 56.1 46.7 34.0 29.1 10.3
1933 24.8 15.5 30.5 32.3 42.4 57.4 61.2 56.6 52.4 41.4 31.7 30.7
1934 25.7 26.1 30.5 38.1 49.8 54.8 62.5 58.2 43.9 40.3 31.7 24.2
1935 24.2 23.1 28.6 32.3 39.0 50.1 58.8 57.6 48.7 36.6 24.5 20.3
1936 19.5 10.1 27.6 36.4 46.1 56.1 62.1 59.1 49.2 37.1 29.5 23.4
1937 6.7 19.6 26.8 34.1 45.2 50.8 59.4 59.7 50.9 40.3 28.3 21.0
1938 21.7 24.2 29.9 35.4 42.8 52.8 57.5 59.3 52.2 41.3 24.3 20.9
1939 23.8 15.3 29.8 36.4 45.2 51.9 59.1 55.6 50.6 39.1 30.6 28.5
1940 12.8 24.3 31.0 33.4 45.6 54.2 58.8 54.7 50.2 40.7 24.7 22.8
1941 21.1 24.4 23.8 34.1 47.0 50.8 56.7 55.6 44.9 36.9 29.7 22.3
1942 15.8 13.0 23.9 35.5 40.1 51.0 58.8 57.1 47.6 38.9 30.6 26.2
1943 21.5 26.6 21.9 41.4 40.6 52.9 59.6 59.7 47.0 39.0 28.7 23.9
1944 21.0 20.8 21.9 31.4 44.9 51.7 55.7 57.5 48.5 41.2 31.2 20.5
1945 23.0 23.5 27.9 30.2 43.2 48.3 57.6 58.0 45.8 40.7 31.1 20.0
1946 21.2 25.2 32.4 41.7 40.8 52.9 58.7 56.9 49.1 36.0 26.4 27.3
1947 21.7 19.3 25.2 35.7 44.5 49.7 Miss 62.5 54.9 44.9 23.2 26.0
1948 19.8 20.1 23.1 39.7 47.1 55.0 60.7 61.2 56.1 40.8 28.2 22.1
1949 9.6 21.3 29.3 40.1 47.7 54.8 61.4 59.3 52.1 36.9 39.4 23.9
1950 19.7 29.8 28.3 35.4 42.5 54.4 58.1 58.3 49.6 46.5 28.9 28.0
1951 20.5 26.5 24.5 34.0 46.0 49.2 60.6 58.8 48.9 38.5 27.5 20.8
1952 24.0 26.0 24.7 38.4 46.1 59.7 62.0 57.9 54.0 42.4 25.5 25.3
1953 31.7 25.3 32.5 33.0 42.7 57.9 62.3 59.8 54.6 44.5 34.3 23.9
1954 26.2 34.0 25.2 40.5 44.5 55.8 63.8 61.4 54.9 40.1 35.4 26.5
1955 19.6 17.4 25.2 38.3 47.2 51.5 62.0 62.4 52.8 42.2 26.0 24.4
1956 26.4 19.8 29.3 36.2 48.5 60.0 60.8 59.0 54.2 43.9 28.4 28.1
1957 16.2 29.3 27.6 31.7 43.8 54.1 63.0 59.2 48.5 42.0 29.9 32.2
1958 25.3 27.6 23.6 35.4 51.7 56.1 58.0 61.3 51.0 41.6 28.3 25.7
1959 19.9 20.9 27.6 33.9 44.6 55.9 56.8 59.0 45.9 35.5 25.3 26.5
1960 19.5 18.3 28.1 38.7 46.3 56.7 61.4 59.4 52.1 41.4 30.1 23.5
1961 23.7 27.7 29.0 34.5 46.1 54.7 59.5 59.5 44.3 39.4 26.1 19.0
1962 11.4 23.2 24.5 38.9 48.6 53.1 57.8 57.9 49.3 43.6 32.6 24.8
1963 10.0 28.9 28.5 38.2 47.8 56.2 63.0 59.3 55.1 47.4 30.0 20.0
1964 23.3 20.3 23.2 34.9 48.1 53.7 62.7 57.5 49.5 41.1 30.0 24.6
1965 26.8 19.5 18.2 39.3 44.9 54.7 59.7 57.7 43.0 43.2 32.8 26.4
1966 18.0 18.8 31.9 34.4 49.0 53.6 64.1 57.9 50.7 38.1 29.9 21.9
1967 23.7 24.3 32.0 36.0 43.1 50.5 60.5 57.5 49.7 40.8 28.3 16.4
1968 20.6 24.9 31.4 32.6 42.2 54.4 59.2 56.6 47.9 40.3 27.1 20.4
1969 23.1 24.3 21.9 40.2 48.3 50.7 61.5 59.9 52.0 30.7 29.1 25.1
1970 22.0 26.5 25.0 31.9 47.1 53.2 60.7 60.4 47.8 36.3 31.1 24.7
1971 23.6 21.1 26.9 34.7 41.8 54.0 56.9 58.0 44.7 37.7 28.6 20.9
1972 19.0 27.5 33.9 36.5 43.5 53.7 54.5 54.9 48.0 37.9 22.9 15.3
1973 17.1 22.6 27.4 30.3 42.4 52.8 55.6 57.3 45.4 39.8 27.8 23.5
1974 15.5 23.6 28.4 34.0 45.5 52.5 58.1 53.9 45.2 41.1 27.8 21.6
1975 20.5 19.5 26.6 31.2 41.7 49.8 57.1 56.0 46.5 39.5 27.0 26.2
1976 18.8 29.1 24.8 36.3 43.1 50.4 57.8 55.0 47.5 34.5 26.6 23.1
1977 14.0 26.5 25.2 35.9 44.6 55.6 59.1 55.1 49.5 38.5 29.4 26.2
1978 15.7 19.6 29.9 35.6 41.9 51.0 57.9 53.6 48.8 38.5 28.0 15.5
1979 9.5 22.3 30.8 36.2 Miss Miss 59.8 54.7 48.8 41.3 23.2 25.5
1980 18.1 23.7 26.2 33.9 42.3 53.9 58.4 56.7 50.0 38.0 31.1 31.0
1981 25.7 24.8 29.3 42.1 43.2 53.2 55.7 54.9 50.0 38.6 34.6 25.5
1982 20.1 21.3 30.1 34.6 42.5 48.3 57.4 59.0 49.6 37.1 Miss 23.9
1983 Miss Miss 27.4 31.2 40.0 47.9 57.5 59.3 48.1 37.0 26.9 9.6
1984 16.0 22.7 26.9 30.6 44.5 50.8 57.9 57.4 45.9 33.5 26.7 19.7
1985 14.5 15.6 27.5 38.4 44.8 53.4 58.4 55.4 44.0 36.5 20.7 19.7
1986 27.4 25.6 35.3 37.2 42.6 54.7 56.9 56.5 45.9 36.9 28.0 22.0
1987 22.9 25.8 26.9 37.0 46.2 53.5 56.8 55.0 46.2 37.6 29.0 19.9
1988 16.9 22.0 27.5 36.6 45.0 56.1 57.1 56.8 47.2 39.7 29.0 20.1
1989 23.4 12.8 29.7 37.4 44.4 49.9 56.9 Miss Miss Miss Miss Miss
1990 Miss Miss Miss 35.4 40.0 53.5 55.6 54.7 51.5 38.7 32.5 14.5
1991 17.5 28.7 30.4 35.6 44.8 53.2 57.0 56.0 47.6 37.9 26.3 23.4
1992 22.9 29.0 31.8 40.4 45.1 49.4 53.6 52.6 49.4 39.7 22.7 17.4
1993 17.6 20.2 30.7 34.9 44.5 49.7 54.6 Miss 43.9 35.7 23.1 24.1
1994 23.7 19.3 30.3 33.7 44.6 53.1 56.0 56.7 50.2 38.1 25.5 23.8
1995 22.1 24.9 29.0 33.0 39.4 48.6 55.0 58.1 47.1 36.4 32.1 24.2
1996 16.6 24.3 24.8 36.7 44.4 51.8 57.5 53.8 46.1 39.4 27.5 23.8
1997 18.9 22.2 30.3 30.1 43.3 52.6 56.8 55.9 51.2 38.9 26.2 23.4
1998 24.4 24.8 25.2 33.9 43.3 46.5 58.9 56.6 51.8 37.9 32.8 20.2
1999 23.9 28.8 31.7 32.3 41.3 49.5 58.9 55.8 43.8 36.0 32.6 24.8
200024.928.029.734.9 45.4 52.0 59.5 57.8 47.2 36.3 19.3 18.9
2001 21.7 20.9 29.1 37.4 44.6 52.8 60.1 57.6 49.5 38.9 30.5 22.9
2002 21.1 21.4 22.3 37.3 41.2 53.9 60.1 54.8 50.5 33.6 28.0 24.9
2003 26.5 20.0 30.9 37.2 43.1 49.4 59.3 58.4 45.4 41.3 28.124.4
2004 23.5 21.5 33.5 37.0 45.7 49.2 54.8 51.8 47.8 38.7 28.8 24.6
2005 23.7 26.1 30.0 35.1 44.6 50.9 58.5 55.2 50.838.931.521.0
2006 28.1 21.0 26.5 38.1 45.9 54.4 59.9 57.9 43.9 38.5 30.3 24.3
2007 14.8 21.834.235.1 43.4 50.7 59.2 58.5 49.3 40.7 31.0 18.1
200819.822.727.5 32.6 42.5 50.1 58.054.8 45.6 37.632.5 17.2
200926.126.929.4 33.946.1 49.6 54.654.247.931.930.715.5
201021.119.329.635.340.052.356.857.549.140.827.224.4
201118.131.135.241.451.258.458.648.563.437.529.719.2
201225.620.635.839.444.057.159.957.450.937.132.321.1
201319.719.627.029.843.653.557.556.752.535.629.718.7
201420.718.928.736.042.950.657.955.149.140.725.221.6
201523.123.231.636.641.953.855.756.051.442.927.521.7
201621.627.330.036.740.954.557.855.048.643.032.917.6
201720.029.435.534.141.452.458.054.249.436.433.522.1
201823.519.028.833.545.953.756.855.050.637.226.120.5
201921.918.024.136.038.649.657.257.750.730.925.924.1
202023.519.330.232.444.253.157.857.148.235.330.622.9
202122.215.527.832.442.153.657.756.251.337.933.427.0
202220.416.526.832.841.552.659.058.350.938.623.617.8
202319.720.023.932.944.350.457.357.049.636.730.726.6
202417.726.729.036.842.054.556.657.9
 

1991-2020 (At NIST site)
Statistic JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Mean 21.99 22.87 29.59 35.10 43.28 51.70 57.54 56.03 48.64 37.77 28.68 21.73
STD 3.06 3.64 3.20 2.47 2.05 2.12 1.81 1.79 2.39 2.81 3.49 2.71

1893-1992
Statistic JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Mean 20.2 22.3 27.5 35.9 44.4 53.1 58.8 57.8 49.3 39.3 28.9 22.2
STD 4.9 5.2 4.1 2.9 2.6 2.6 2.6 2.5 3.2 3.1 3.6 4.7

Data was obtained from GCPS (1893-1990) and the local station report(1991-present).
Page Last Reviewed: Sep 1, 2024