BOULDER, COLORADO

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(050848)

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 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 39.06 28.30 28.00 31.79
1894 21.95 i 16.50 j 29.48 37.17 ----- z ----- z 56.46 c 54.58 ----- z ----- z ----- z 21.35 39.81
1895 15.00 c 12.04 b 23.93 b 36.13 42.86 b 47.03 50.30 u ----- z ----- z ----- z ----- z ----- z 29.50
1896 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1897 ----- z ----- z ----- z ----- z 50.97 55.27 60.13 59.84 57.97 42.87 32.63 21.19 47.61
1898 21.48 29.43 25.81 38.57 43.03 56.20 62.29 61.77 50.50 37.68 26.03 19.39 39.35
1899 21.71 7.61 22.29 35.73 43.48 52.87 57.10 57.71 53.27 39.61 36.80 24.65 37.74
1900 25.03 19.32 30.16 35.40 48.13 57.17 58.94 59.77 50.00 44.97 30.97 27.29 40.60
1901 23.71 18.00 28.16 35.86 a 48.19 53.70 62.74 59.32 48.07 39.77 34.80 23.13 39.62
1902 21.42 26.18 28.35 36.43 47.42 53.77 57.17 a 59.48 46.93 44.29 30.24 a 25.35 39.75
1903 25.37 a 12.64 26.32 36.57 43.00 50.14 b 59.35 58.55 48.37 42.35 29.47 27.84 38.33
1904 20.70 a 28.55 29.87 37.30 44.03 50.40 56.00 57.39 51.90 42.48 35.83 26.61 40.09
1905 19.27 a 16.14 34.26 36.37 42.35 54.67 56.68 59.90 52.90 36.94 33.10 a 25.64 c 39.02
1906 27.68 24.93 20.48 38.53 45.55 49.73 56.84 57.26 50.83 39.06 28.30 30.68 39.16
1907 22.35 30.86 35.74 34.83 40.81 51.70 58.03 59.00 52.10 42.29 29.43 26.35 40.29
1908 26.55 25.76 34.16 39.90 41.77 51.57 57.97 56.87 53.40 38.29 30.53 23.45 40.02
1909 26.03 25.71 25.48 32.47 41.19 53.43 58.90 60.48 50.07 44.61 34.67 10.03 38.59
1910 19.39 17.61 43.71 43.33 44.42 53.57 ----- z ----- z 48.40 38.58 32.67 23.60 a 36.53
1911 25.19 18.75 31.71 36.03 44.45 55.17 56.90 54.45 49.87 34.48 23.10 ----- z 39.10
1912 ----- z ----- z 20.61 h 34.27 43.26 d 50.93 c 56.00 56.55 42.23 37.06 29.72 a 19.00 41.00
1913 16.90 12.32 22.77 35.93 44.55 52.50 57.03 59.32 47.00 35.00 32.37 14.29 35.83
1914 24.81 18.70 a 27.23 a 36.10 a 45.61 54.60 58.13 57.03 50.53 41.10 33.10 13.13 38.34
1915 17.35 24.64 22.71 40.97 41.74 50.03 54.94 53.55 48.34 a 40.55 32.30 19.90 37.25
1916 11.77 23.14 35.03 38.80 46.17 a 57.13 66.00 59.81 50.87 38.26 27.14 b 16.94 39.25
1917 18.84 24.61 22.23 a 33.63 40.48 54.10 63.13 59.03 52.73 34.45 35.80 26.23 38.77
1918 16.55 24.14 34.71 33.03 48.77 58.37 62.71 64.35 49.97 43.53 a 25.93 22.16 40.35
1919 25.10 19.69 b 28.52 37.73 45.00 53.40 66.03 65.97 58.00 40.55 i 21.85 c 16.52 d 39.80
1920 20.35 20.69 25.39 28.17 42.48 50.62 a 55.90 53.73 a 46.67 c 38.00 b 23.55 a 21.00 a 35.55
1921 22.61 24.64 31.42 33.17 43.45 b 53.47 56.77 56.77 48.00 a 41.71 29.57 22.84 38.70
1922 12.71 18.52 c 26.32 33.00 44.23 55.67 57.84 58.50 a 51.62 a 37.42 26.13 22.68 37.05
1923 27.00 16.30 a 21.45 34.67 43.10 51.37 57.97 54.50 a 46.80 33.87 29.87 19.68 36.38
1924 18.16 29.62 20.32 34.77 42.06 53.77 59.81 61.81 44.93 37.39 29.03 11.39 36.92
1925 17.10 26.82 28.42 38.07 46.55 52.47 60.23 56.19 49.53 32.00 29.17 21.71 38.19
1926 21.87 28.14 28.10 36.47 46.77 53.47 57.16 57.06 47.03 38.13 30.10 16.71 38.42
1927 21.58 25.04 23.00 35.00 43.10 49.43 54.00 51.74 45.73 38.23 30.55 a 12.45 35.82
1928 23.06 19.66 26.74 31.03 43.77 46.50 54.19 53.84 45.47 37.65 23.03 18.87 35.32
1929 13.74 10.07 28.29 34.37 41.84 51.37 58.90 58.16 44.83 38.39 19.30 23.42 35.22
1930 3.45 28.79 24.52 41.50 42.45 53.80 58.94 56.71 47.57 35.94 27.90 19.35 36.74
1931 22.58 26.00 24.45 34.97 41.74 55.17 58.97 57.13 50.40 40.35 24.43 22.48 38.22
1932 14.90 26.00 19.53 a 34.93 44.61 50.20 57.68 56.10 46.67 33.97 28.97 a 10.29 35.32
1933 24.81 15.54 30.52 32.27 42.39 57.40 61.46 c 56.68 53.37 42.63 a 31.70 30.90 39.97
1934 25.74 26.14 30.39 37.40 49.77 54.77 62.19 58.23 43.43 40.32 31.67 24.23 40.36
1935 24.19 23.07 28.61 32.27 38.97 47.18 s 58.81 57.65 48.70 36.58 24.50 20.32 35.79
1936 19.74 10.07 27.65 36.60 46.13 56.13 62.06 59.10 49.23 37.10 ----- z 23.42 38.84
1937 6.74 19.57 26.81 34.10 45.16 50.77 59.42 59.71 50.87 40.32 28.30 20.97 36.89
1938 21.74 24.25 29.87 35.37 42.81 52.77 57.55 59.19 52.23 41.23 24.27 20.90 38.51
1939 23.81 15.29 29.84 36.43 45.23 51.93 59.06 55.65 50.63 39.13 30.63 28.48 38.84
1940 12.77 24.34 31.03 33.37 45.65 54.17 58.84 54.68 50.17 40.68 24.70 22.81 37.77
1941 21.97 24.15 a 24.20 a 34.07 46.97 50.77 56.68 55.63 a 45.07 36.90 29.67 22.29 37.36
1942 15.81 13.04 23.90 35.53 40.13 51.00 58.81 57.06 47.57 38.90 30.57 25.87 36.52
1943 21.52 26.61 22.03 41.43 40.65 52.87 59.65 59.74 47.00 38.97 28.67 23.87 38.58
1944 20.97 20.79 21.87 31.43 44.94 51.67 55.74 57.52 48.53 41.16 31.13 20.65 37.20
1945 23.00 23.50 27.94 30.17 43.19 48.30 57.65 58.03 45.80 40.74 31.13 20.00 37.45
1946 21.39 25.18 32.42 41.73 40.77 52.93 58.71 57.70 d 49.13 35.97 26.37 27.32 39.14
1947 21.38 b 19.29 25.16 35.70 44.55 49.70 63.15 d 62.52 54.93 44.90 23.23 26.03 39.21
1948 19.77 20.24 23.13 39.70 46.84 54.97 60.74 61.32 ----- z ----- z ----- z 15.00 v 40.84
1949 9.65 21.32 29.32 40.07 47.73 a 54.77 61.42 59.26 52.07 36.90 39.37 23.94 39.65
1950 19.74 29.79 28.29 35.40 42.45 54.40 58.06 58.29 49.63 46.52 28.90 28.00 39.96
1951 20.52 26.50 24.45 33.97 46.03 49.17 60.65 58.77 48.90 38.48 27.53 20.77 37.98
1952 23.97 25.97 24.68 38.37 46.06 59.67 62.03 57.90 54.03 42.39 25.50 25.26 40.49
1953 31.71 25.32 32.55 33.00 42.74 57.87 62.32 59.77 54.60 44.45 34.30 23.87 41.88
1954 26.16 34.00 25.16 40.50 44.52 55.80 63.81 61.39 54.90 39.54 c 35.43 26.55 42.31
1955 19.61 17.43 25.16 38.30 47.50 a 51.47 61.97 62.42 52.80 42.23 26.00 24.35 39.10
1956 26.39 19.83 29.32 36.17 48.52 59.97 60.77 59.03 54.17 43.94 28.43 28.10 41.22
1957 16.23 29.32 27.65 31.73 43.77 54.13 62.97 59.19 48.47 42.03 29.87 32.16 39.79
1958 25.26 27.57 23.61 35.43 51.68 56.07 58.00 61.32 51.03 41.65 28.30 25.71 40.47
1959 19.90 20.93 27.61 33.87 44.58 55.93 56.77 58.97 45.93 35.48 25.30 26.55 37.65
1960 19.55 18.31 28.10 38.73 46.29 56.70 61.35 59.35 52.10 41.35 30.07 23.48 39.62
1961 23.74 27.71 29.00 34.53 46.06 54.73 59.48 59.55 44.30 39.42 26.10 19.00 38.64
1962 11.42 23.18 24.55 38.87 48.65 53.07 57.81 57.90 49.27 43.65 32.60 24.77 38.81
1963 9.97 28.86 28.45 38.17 47.84 56.20 63.03 a 59.26 55.13 47.42 30.03 20.00 40.36
1964 23.29 20.28 23.19 34.87 48.13 53.67 62.71 57.55 49.53 41.13 30.03 24.65 39.09
1965 26.77 19.54 18.19 39.30 44.90 54.73 59.74 57.71 42.97 43.19 32.83 26.35 38.85
1966 18.00 18.75 31.94 34.43 49.00 53.60 64.06 57.87 50.67 38.13 29.87 21.87 39.02
1967 23.71 24.29 31.97 35.97 43.10 50.53 60.52 57.52 49.70 40.81 28.27 16.42 38.57
1968 20.58 24.90 31.35 32.63 42.23 54.40 59.16 56.58 47.90 40.29 27.13 20.39 38.13
1969 23.06 24.32 21.94 40.23 48.26 50.70 61.52 59.94 51.97 30.68 29.10 25.10 38.90
1970 22.00 26.46 25.03 31.87 47.06 53.23 60.68 60.42 47.77 36.29 31.10 24.68 38.88
1971 23.61 21.11 26.87 34.70 41.84 54.03 56.87 57.97 44.70 37.68 28.63 20.87 37.41
1972 18.97 27.52 33.94 36.47 43.52 53.70 54.55 54.94 48.03 37.87 22.87 15.32 37.31
1973 17.13 22.61 27.39 30.30 42.35 52.83 55.58 57.29 45.37 39.77 27.80 23.48 36.83
1974 15.45 23.64 28.39 34.03 45.45 52.53 58.13 53.90 45.20 41.10 27.83 21.58 37.27
1975 20.52 19.54 26.58 31.17 41.74 49.77 57.13 56.03 46.47 39.48 26.97 26.23 36.80
1976 18.84 29.10 24.81 36.33 43.10 50.37 57.84 55.00 47.53 34.48 26.63 23.13 37.26
1977 13.97 26.54 25.19 35.87 44.61 55.63 59.13 55.10 49.53 38.45 29.40 26.23 38.30
1978 15.71 19.61 29.94 35.63 41.87 a 50.97 57.94 53.58 48.83 38.52 28.00 ----- z 38.23
1979 9.55 22.28 c 30.81 36.17 ----- z ----- z 57.32 54.71 ----- z 41.33 a 23.20 25.52 33.43
1980 18.06 23.72 26.19 33.87 42.32 53.87 ----- z 56.74 49.97 38.00 31.07 30.97 36.80
1981 25.68 24.75 29.26 42.10 43.19 53.17 55.68 54.90 49.97 38.58 34.59 a 25.55 39.78
1982 20.10 21.32 30.10 34.60 42.45 48.30 57.35 59.00 49.60 37.06 ----- z 23.87 38.52
1983 ----- z 25.47 k 27.39 31.17 40.03 47.90 57.55 59.26 48.07 37.00 26.93 9.65 38.49
1984 16.03 22.69 26.90 30.63 44.52 50.77 57.90 57.35 45.90 33.55 26.73 19.68 36.05
1985 14.48 15.64 27.48 38.37 44.81 53.37 58.39 55.43 a 44.00 b 36.55 20.70 19.68 35.74
1986 27.41 b 25.61 35.26 37.20 42.61 54.73 56.90 56.45 45.93 36.90 28.00 22.03 39.09
1987 22.87 25.79 26.90 37.00 46.19 53.47 56.84 55.03 46.20 37.61 29.00 19.87 38.06
1988 16.90 22.00 27.55 36.57 45.03 56.13 57.13 56.77 47.23 39.71 28.97 20.13 37.84
1989 23.35 12.82 29.68 37.43 44.39 49.87 56.94 ----- z ----- z ----- z ----- z ----- z 36.35
1990 ----- z ----- z ----- z 35.40 40.03 53.47 55.61 54.74 51.53 38.71 32.53 14.45 41.83
1991 17.48 28.50 30.42 35.57 44.81 53.23 56.97 55.97 47.63 37.58 26.30 23.74 38.18
1992 23.58 29.00 31.84 40.37 45.10 49.37 53.65 52.61 49.40 39.68 22.70 16.94 37.85
1993 17.65 20.21 30.71 34.93 44.52 49.70 54.61 ----- z 43.87 35.68 23.13 23.74 34.43
1994 23.65 18.61 30.13 33.73 44.58 52.73 55.65 56.71 49.33 38.10 25.50 23.81 37.71
1995 21.32 24.89 29.00 33.03 39.35 48.60 54.97 58.13 47.10 36.39 32.03 24.16 37.42
1996 16.58 24.34 24.81 36.70 44.32 51.83 57.55 53.77 46.13 39.35 27.47 23.84 37.23
1997 18.87 22.18 30.29 30.10 43.32 52.63 56.81 55.94 51.23 38.87 ----- z ----- z 40.02
1998 24.35 24.82 25.19 33.87 43.35 47.80 58.94 ----- z 51.77 37.87 ----- z ----- z 38.66
1999 ----- z ----- z ----- z ----- z 41.26 49.47 58.71 55.84 43.83 36.03 32.31 a 24.42 42.73
2000 24.97 28.07 29.71 35.00 b 45.97 51.69 a 58.87 57.84 47.33 36.32 19.27 18.94 37.83
2001 21.68 20.93 29.06 37.37 44.61 52.53 60.10 57.58 49.47 38.87 30.50 22.87 38.80
2002 21.10 21.36 22.32 37.30 41.16 53.93 60.19 54.77 50.53 33.65 27.97 24.87 37.43
2003 26.55 20.04 30.94 37.23 43.10 49.43 59.26 58.42 45.37 41.29 28.07 24.42 38.68
2004 23.48 21.52 33.52 37.00 45.71 49.20 54.77 51.84 47.83 38.74 28.77 24.61 38.08
2005 23.68 26.07 30.03 35.07 44.61 50.93 58.48 55.19 50.77 39.26 31.47 20.97 38.88
2006 28.06 20.96 26.45 38.10 45.90 54.37 59.94 57.87 43.93 38.48 30.30 24.32 39.06
2007 14.81 21.75 34.16 35.07 43.35 50.73 59.19 58.32 49.30 40.68 31.00 18.13 38.04
2008 19.84 22.69 27.48 32.57 42.48 50.07 58.03 54.84 45.60 37.61 32.53 17.19 36.75
2009 26.06 26.93 29.35 33.93 ----- z 49.57 54.61 54.23 47.93 31.87 30.73 15.48 36.43
2010 21.16 19.32 29.58 35.27 40.00 52.33 56.84 57.52 49.07 40.77 27.20 24.39 37.79
2011 21.06 18.11 31.13 35.17 41.39 51.23 58.35 58.61 48.47 37.52 29.70 19.19 37.49
2012 25.58 20.55 35.84 39.43 44.00 57.10 59.87 57.39 50.90 37.06 32.48 a 21.10 40.11
2013 19.74 19.56 a 26.90 a 29.00 z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 22.07
Period of Record Statistics
MEAN 20.51 22.42 27.89 35.75 44.24 52.77 58.68 57.54 48.98 39.00 28.91 22.24 38.36
S.D. 4.81 4.88 4.01 2.83 2.51 2.69 2.55 2.47 3.11 3.05 3.67 4.43 1.45
SKEW -0.81 -0.57 0.40 0.13 0.43 0.15 0.54 0.29 0.34 0.08 -0.15 -0.65 0.04
MAX 31.71 34.00 43.71 43.33 51.68 59.97 66.03 65.97 58.00 47.42 39.37 32.16 42.31
MIN 3.45 7.61 18.19 28.17 38.97 46.50 53.65 51.74 42.23 30.68 19.27 9.65 35.22
NO YRS 113 113 115 116 115 115 115 113 113 114 111 112 96