Boulder Daily Climatology
Plot of daily average max and min temperatureSnow records are from 1948 onward. They now reflect the values in the daily dataset (except for additional days given to me for 1989-90 to replace missing days) Temperatures are from approximately 100 years of record: Temperatures are in degrees Fahrenheit. Snow records are in inches.
Months
January | May | September |
February | June | October |
March | July | November |
April | August | December |
Note, for record highs, the first value is the highest daily maximum value. The 2nd is the highest daily minimum value. For lows, the first is the lowest daily minimum value and the 2nd is the lowest daily maximum value. Year is for the highest maximum temperature and for the lowest minimum.
January climatology  
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 41 | 18 | 70/44 | 1997 | -14/-3 | 1942 | 7.5/1985 |
2 | 42 | 17 | 70/49 | 1997 | -14/4 | 1911 | 6.0/1971 |
3 | 42 | 18 | 68/44 | 1918&97 | -10/4 | 1911 | 8.5/1949 |
4 | 43 | 19 | 67/44 | 1927 | -14/8 | 1959 | 5.1/1996 |
5 | 44 | 19 | 69/44 | 1956 | -13/11 | 1942 | 11.5/2007 |
6 | 43 | 19 | 70/46 | 1954 | -20/-9 | 1913 | 9.2/1998 |
7 | 44 | 19 | 69/49 | 2006 | -22/-4 | 1913 | 1.5/1986 |
8 | 45 | 21 | 70/50 | 1909 | -16/2 | 1937 | 15.5/1962 |
9 | 44 | 22 | 77/47 | 1934 | -11/9 | 1973 | 4.1/1993 |
10 | 44 | 20 | 70/55 | 1990 | -13/9 | 1962 | 5.4/2002 |
11 | 43 | 18 | 69/43 | 1953 | -18/-2 | 1963 | 4.6/1989 |
12 | 44 | 18 | 70/46 | 1953 | -22/1 | 1963 | 6.0/2009 |
13 | 45 | 21 | 69/45 | 1928 | -12/3 | 1997 | 3.0/1972 |
14 | 47 | 23 | 67/52 | 2006 | -9/6 | 1972 | 5.0/1967 |
15 | 45 | 23 | 69/45 | 1901 | -8/6 | 1972 | 10.0/1987 |
16 | 45 | 21 | 71/46 | 1974 | -9/4 | 1930 | 7.0/2001 |
17 | 44 | 20 | 67/39 | 1974 | -33/6 | 1930 | 4.7/1996 |
18 | 44 | 21 | 65/43 | 1965,2009 | -19/5 | 1984 | 4.2/1988 |
19 | 45 | 21 | 69/51 | 1986.2009 | -17/6 | 1963 | 8.5/1990* |
20 | 44 | 19 | 73/47 | 2005 | -15/6 | 1935 | 9.1/1973 |
21 | 44 | 19 | 70/43 | 2009 | -18/0 | 1930 | 4.3/1975 |
22 | 44 | 21 | 74/49 | 1925 | -11/10 | 1917 | 3.3/1974 |
23 | 45 | 20 | 71/38 | 1981 | -10/12 | 1963 | 4.4/2002 |
24 | 45 | 22 | 70/44 | 1968 | -8/8 | 1949 | 10.4/1978 |
25 | 45 | 21 | 70/47 | 1935 | -8/10 | 1903 | 6.5/1996 |
26 | 44 | 20 | 72/45 | 1982 | -20/7 | 1903 | 4.9/1961 |
27 | 45 | 19 | 68/49 | 1986/03 | -6/4 | 2009 | 3.9/2007 |
28 | 45 | 20 | 67/50 | 1988 | -9/7 | 1903 | 8.6/1989 |
29 | 44 | 20 | 70/44 | 1931 | -12/-3 | 1951 | 6.5/1994 |
30 | 44 | 19 | 71/47 | 1986 | -6/10 | 1951 | 5.8/2002 |
31 | 45 | 20 | 69/53 | 1989 | -9/4 | 1985 | 7.6/2005 |
February climatology  
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 44 | 20 | 71/48 | 1934 | -15/6 | 1951 | 2.3/1983 |
2 | 44 | 20 | 74/49 | 1934 | -16/1 | 1996 | 1.3/1977 |
3 | 44 | 22 | 74/47 | 1954 | -17/-5 | 1989 | 7.0/1955 |
4 | 46 | 21 | 73/46 | 1935 | -18/-12 | 1989 | 8.5/1959 |
5 | 46 | 22 | 75/46 | 1963 | -24/6 | 1989 | 3.3/1975 |
6 | 46 | 22 | 67/45 | 1927/2007 | -16/5 | 1914 | 5.0/1986 |
7 | 46 | 20 | 74/44 | 1987 | -19/-3 | 1933 | 6.5/1980 |
8 | 45 | 20 | 79/51 | 1954 | -28/7 | 1936 | 13.5/1956 |
9 | 44 | 21 | 78/47 | 1954 | -16/-5 | 1933 | 6.0/1953 |
10 | 47 | 22 | 72/48 | 1962 | -15/12 | 1933 | 5.5/1988 |
11 | 47 | 22 | 75/49 | 1962 | -15/1 | 1905 | 7.2/1965 |
12 | 48 | 23 | 72/45 | 1921 | -20/4 | 1905 | 10.4/1968 |
13 | 46 | 23 | 74/50 | 1979 | -9/7 | 1905 | 6.4/1966 |
14 | 45 | 21 | 70/48 | 1981 | -6/14 | 1903 | 4.9/2001 |
15 | 45 | 20 | 67/45 | 1982 | -12/10 | 1903 | 7.4/1965 |
16 | 47 | 23 | 69/42 | 1970 | -11/5 | 1900 | 6.5/1978 |
17 | 47 | 23 | 68/48 | 1970 | -11/10 | 1936 | 5.5/1988 |
18 | 46 | 23 | 70/46 | 1930 | -14/9 | 2006 | 6.5/1955 |
19 | 46 | 22 | 71/49 | 1981 | -4/16 | 2006 | 7.6/1987 |
20 | 47 | 23 | 74/48 | 1981 | -1/17 | 1918 | 8.0/1971 |
21 | 46 | 23 | 77/46 | 1982 | 4/15 | 1911 | 4.0/1971 |
22 | 48 | 23 | 73/45 | 1982 | -1/15 | 1911 | 8.5/1960 |
23 | 47 | 23 | 74/52 | 2002 | -5/16 | 1899 | 7.0/1997 |
24 | 46 | 23 | 72/54 | 1981 | -4/11 | 2003 | 4.0/1956 |
25 | 47 | 24 | 75/58 | 1986 | -6/17 | 1935 | 5.9/2002 |
26 | 47 | 23 | 72/44 | 1932 | -6/9 | 1962 | 5.0/1997 |
27 | 47 | 23 | 75/50 | 1932 | -8/7 | 1962 | 4.3/2003 |
28 | 47 | 23 | 74/50 | 1932,2006 | -11/12 | 1962 | 6.0/2007 |
29 | 51 | 23 | 68/48 | 1940 | -5/24 | 1960 | 2.2/2004 |
March climatology 
Day | Normal High | Normal Low | Record High | Year of high high | Record Low | Year of low low | snow/year |
---|---|---|---|---|---|---|---|
1 | 48 | 24 | 73/51 | 2008 | -1/17 | 1927 | 9.0/2002 |
2 | 49 | 24 | 75/51 | 1901 | -6/15 | 2002 | 3.9/2008 |
3 | 47 | 24 | 73/46 | 1921 | -4/14 | 1943 | 7.0/1964 |
4 | 45 | 23 | 74/49 | 2009 | -1/10 | 1960 | 5.1/1976 |
5 | 46 | 23 | 73/44 | 1925 | -2/15 | 1948 | 9.2/1971 |
6 | 48 | 23 | 73/51 | 1972 | -8/22 | 1943 | 11.6/1990* |
7 | 49 | 23 | 70/43 | 1972 | -8/20 | 1943 | 10.0/1998 |
8 | 51 | 25 | 74/51 | 1986 | -1/13 | 1932/98 | 5.2/2006 |
9 | 51 | 27 | 77/47 | 1989 | -13/13 | 1932 | 16.1/1992 |
10 | 50 | 26 | 79/50 | 1900 | -7/11 | 1932 | 5.5/1970 |
11 | 49 | 26 | 78/56 | 1900 | -9/12 | 1932 | 11.0/1956 |
12 | 50 | 26 | 74/52 | 1900 | -10/17 | 1932 | 13.0/1963 |
13 | 51 | 26 | 75/52 | 1910 | 4/25 | 1950,2007 | 7.0/1963 |
14 | 49 | 26 | 76/51 | 1925 | 4/20 | 1925 | 8.4/1997 |
15 | 49 | 26 | 71/52 | 1966 | 2/17 | 1906 | 4.0/1960 |
16 | 53 | 27 | 74/50 | 1966 | -4/12 | 1906 | 8.0/1983 |
17 | 54 | 28 | 75/54 | 1908 | 0/18 | 1924 | 5.6/1988 |
18 | 53 | 28 | 77/49 | 1907 | -5/14 | 1923 | 16.9/1998 |
19 | 52 | 28 | 79/62 | 1907 | -1/16 | 1965 | 10.8/2003 |
20 | 52 | 29 | 80/57 | 1997 | -3/16 | 1927 | 6.5/1989 |
21 | 53 | 28 | 83/54 | 1910 | -1/24 | 1914 | 17.1/1952 |
22 | 55 | 29 | 80/56 | 1910 | 0/14 | 1898 | 6.5/1984 |
23 | 54 | 29 | 76/52 | 1967 | 3/18 | 1898 | 6.9/1974 |
24 | 53 | 30 | 76/51 | 1956 | ? | ? | 10.2/1996 |
25 | 53 | 29 | 78/53 | 1985 | -2/14 | 1996 | 12.5/1959 |
26 | 52 | 27 | 79/51 | 1971 | -1/23 | 1955 | 16.2/2009 |
27 | 52 | 27 | 78/55 | 1986 | -5/20 | 1931 | 10.6/1975 |
28 | 53 | 28 | 78/49 | 1986 | -2/23 | 1975 | 9.4/1972 |
29 | 53 | 29 | 79/55 | 1943 | 4/23 | 1975 | 8.3/1987 |
30 | 56 | 28 | 79/51 | 1986 | 6/29 | 1926 | 18.5/1970 |
31 | 57 | 30 | 79/56 | 1946 | 1/21 | 1899 | 8.7/1988 |
April climatology 
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 56 | 31 | 78/52 | 2004 | 7/25 | 1936 | 10.4/1975 |
2 | 58 | 33 | 77/51 | 1981 | -3/33 | 1975 | 20.6/1957 |
3 | 56 | 31 | 77/53 | 1943 | 12/26 | 1945 | 12.0/1986 |
4 | 56 | 31 | 78/47 | 1959 | 9/20 | 1945 | 5.1/1971 |
5 | 58 | 32 | 80/52 | 1991 | 5/32 | 1939 | 6.8/1990 |
6 | 59 | 33 | 80/54 | 1991 | 4/22 | 1938 | 2.5/1964 |
7 | 57 | 33 | 81/53 | 1930 | 15/26 | 1938 | 12.3/1957 |
8 | 57 | 33 | 83/51 | 1930 | 9/32 | 1973 | 11.5/1959 |
9 | 59 | 33 | 78/54 | 1977 | 8/28 | 1973 | 11.8/1989 |
10 | 59 | 34 | 80/55 | 1960 | 5/29 | 1959 | 11.1/1995 |
11 | 58 | 34 | 81/56 | 1982 | 9/26 | 1940 | 12.0/1953 |
12 | 59 | 34 | 78/50 | 1908 | 2/33 | 1997 | 7.5/1991 |
13 | 61 | 35 | 83/52 | 2006 | 14/38 | 1959 | 10.3/1974 |
14 | 62 | 36 | 80/57 | 1963 | 16/27 | 1933 | 3.6/1949 |
15 | 62 | 36 | 85/54 | 1985 | 15/33 | 1945 | 8.0/1951 |
16 | 61 | 35 | 81/52 | 1958 | 21/31 | 1947 | 3.5/1998 |
17 | 62 | 36 | 83/55 | 1987 | 17/31 | 1901 | 8.2/1968 |
18 | 62 | 36 | 84/53 | 1987 | 13/31 | 1953 | 8.2/1975 |
19 | 61 | 37 | 82/55 | 1962 | 13/34 | 1966 | 5.0/1966 |
20 | 62 | 36 | 83/68 | 1989 | 15/34 | 1966 | 10.5/1984 |
21 | 64 | 37 | 88/54 | 1989 | 14/40 | 1907 | 4.8/1952 |
22 | 65 | 39 | 84/59 | 1989 | 18/42 | 1920 | 7.4/2001 |
23 | 63 | 39 | 87/57 | 1994 | 22/32 | 1931 | 4.2/1956 |
24 | 62 | 38 | 85/56 | 1949 | 22/32 | 1931 | 16.4/1997 |
25 | 62 | 37 | 84/59 | 1938 | 20/33 | 1924 | 2.5/2006 |
26 | 63 | 38 | 85/55 | 1946 | 15/29 | 1924 | 4.0/1995 |
27 | 63 | 38 | 85/59 | 1910 | 22/37 | 1924 | 3.7/2009 |
28 | 64 | 38 | 82/60 | 1943 | 23/30 | 1917 | 2.1/2005 |
29 | 63 | 38 | 84/59 | 1948 | 21/33 | 1903 | 8.5/2005 |
30 | 63 | 38 | 87/55 | 1992 | 19/34 | 1909 | 6.7/1991 |
May climatology  
Day | Normal High | Normal Low | Record High | Year of high high | Record Low | Year of low low | snow/year |
---|---|---|---|---|---|---|---|
1 | 65 | 39 | 86/55 | 1943 | 23/34 | 1909 | 6.2/1973 |
2 | 65 | 41 | 86/56 | 1981 | 22/35 | 1954 | 2.5/1954 |
3 | 65 | 40 | 86/60 | 1947 | 20/30 | 1907 | 0.5/1967 |
4 | 67 | 41 | 88/59 | 2000 | 28/35 | 1944 | 1.0/1950 |
5 | 67 | 42 | 89/60 | 2000 | 29/35 | 1950 | 9.0/1978 |
6 | 65 | 40 | 87/59 | 1963,2000,2004 | 22/37 | 1917 | 14.0/1978 |
7 | 66 | 42 | 87/65 | 1963 | 31/41 | 1936 | 0 |
8 | 66 | 42 | 85/62 | 1956 | 32/39 | 1944 | 0 |
9 | 68 | 42 | 88/59 | 1916 | 25/34 | 2002 | 0 |
10 | 67 | 43 | 88/62 | 1916 | 26/29 | 1979 | 5.2/2003 |
11 | 68 | 42 | 88/61 | 1963 | 21/45 | 1946 | TR/1968 |
12 | 68 | 42 | 88/60 | 1962 | 24/33 | 1953 | 3.0/1953 |
13 | 68 | 42 | 89/65 | 1988 | 27/38 | 1953 | 0.0 |
14 | 68 | 43 | 88/60 | 1996 | 27/39 | 1912 | 2.0/1967 |
15 | 69 | 44 | 93/59 | 1978 | 29/42 | 1916 | 0 |
16 | 69 | 44 | 93/62 | 1996 | 30/37 | 1923 | 4.0/1957 |
17 | 72 | 45 | 92/61 | 1964 | 28/39 | 1942 | 7.1/1983** |
18 | 72 | 46 | 93/59 | 1970 | 29/40 | 1930 | TR/1971 |
19 | 71 | 45 | 92/63 | 1939 | 22/40 | 1946 | 1.5/1960 |
20 | 70 | 45 | 93/62 | 1954 | 21/40 | 1946 | 0.2/2001 |
21 | 70 | 45 | 90/68 | 2006 | 26/35 | 2001 | 3.6/2001 |
22 | 70 | 45 | 88/66 | 1932 | 32/35 | 1931 | 0 |
23 | 71 | 46 | 90/65 | 1989,00 | 34/48 | 1930 | TR/1971&1994 |
24 | 73 | 47 | 90/58 | 1967 | 32/44 | 1994,2002 | 1.1/2002 |
25 | 73 | 47 | 87/66 | 1969 | 32/50 | 1950 | 8.7/1950 |
26 | 72 | 47 | 91/66 | 1969 | 32/47 | 1950 | 0.0/1950 |
27 | 71 | 47 | 92/60 | 2006 | 33/52 | 1950 | 0 |
28 | 71 | 47 | 95/60 | 2000 | 30/36 | 1947 | 0 |
29 | 73 | 48 | 95/72 | 2000,3 | 30/45 | 1947 | TR/1975 |
30 | 74 | 48 | 91/68 | 1984 | 34/42 | 1973 | TR/1973 |
31 | 73 | 48 | 89/69 | 2002 | 31/51 | 1979 | 0 |
June climatology  
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 73 | 48 | 89/62 | 1997 | 32/48 | 1979 | |
2 | 74 | 48 | 92/62 | 2006 | 30/45 | 1951 | 1.5/1951 |
3 | 74 | 49 | 95/65 | 1958 | 32/46 | 1951 | 0.7/1951 |
4 | 75 | 49 | 94/66 | 1990 | 36/52 | 1937 | |
5 | 76 | 50 | 95/61 | 1946 | 33/49 | 1937 | /98TR/1953/98 |
6 | 75 | 49 | 95/70 | 2000 | 33/54 | 1998 | |
7 | 76 | 50 | 95/65 | 1934/2000 | 35/55 | 1915 | 0.1/93 |
8 | 76 | 50 | 98/64 | 1985 | 34/58 | 2007 | |
9 | 77 | 50 | 96/65 | 1985 | 38/56 | 1974 | |
10 | 77 | 51 | 97/70 | 1952 | 37/49 | 1975 | |
11 | 77 | 53 | 95/69 | 1956 | 36/44 | 1975 | |
12 | 78 | 52 | 100/67 | 1952 | 32/44 | 1947 | 1.0/1947 |
13 | 79 | 53 | 98/69 | 1952 | 32/45 | 1947 | TR/1969 |
14 | 79 | 52 | 100/67 | 2006 | 35/50 | 1969 | |
15 | 79 | 53 | 100/71 | 1952 | 32/45 | 1945 | |
16 | 80 | 53 | 94/65 | 1977 | 32/44 | 1945 | |
17 | 80 | 53 | 96/68 | 1953,2002,2007 | 38/49 | 1912 | |
18 | 80 | 53 | 98/70 | 1936 | 41/53 | 1945 | |
19 | 81 | 53 | 97/71 | 1934 | 38/56 | 1976 | |
20 | 82 | 54 | 96/68 | 1968 | 39/67 | 1946 | |
21 | 81 | 55 | 97/68 | 1922 | 42/60 | 1920 | |
22 | 83 | 55 | 98/81 | 1954 | 40/56 | 2004 | Tr (hail) |
23 | 84 | 56 | 104/74 | 1954 | 44/64 | 1906 | |
24 | 83 | 56 | 100/80 | 1954 | 43/55 | 1976 | Tr (hail) |
25 | 84 | 56 | 99/68 | 1980 | 42/61 | 1958 | |
26 | 84 | 56 | 101/68 | 1971&94 | 42/61 | 1968,2003 | |
27 | 86 | 57 | 100/69 | 1990 | 41/70 | 1985 | |
28 | 86 | 58 | 96/73 | 1931 | 47/61 | 1945 | |
29 | 85 | 57 | 99/73 | 1953 | 46/58 | 1945,2008 | |
30 | 84 | 57 | 99/70 | 1994 | 41/58 | 1935 |
July climatology  
Day | Normal High | Normal Low | Record High | Year of high high | Record Low | Year of low low | rain/year | snow/year |
---|---|---|---|---|---|---|---|---|
1 | 84 | 56 | 101/75 | 2002 | 46/67 | 1995 | 0.64/1970 |   |
2 | 85 | 57 | 99/71 | 1990 | 45/67 | 1915 | 0.64/1981 |   |
3 | 85 | 58 | 98/73 | 1964 | 43/57 | 1922 | 0.76/1972 |   |
4 | 85 | 57 | 98/73 | 1989 | 40/56 | 1921 | 0.52/1972 |   |
5 | 85 | 58 | 99/76 | 1989 | 42/69 | 1972 | 0.30/1990 |   |
6 | 85 | 57 | 100/69 | 1973 | 44/62 | 1931 | 0.26/1954 |   |
7 | 85 | 58 | 100/72 | 1951 | 41/62 | 1904 | 0.26/1957 |   |
8 | 85 | 58 | 100/75 | 1989 | 46/67 | 1929 | 1.47/1967 |   |
9 | 86 | 58 | 99/70 | 1976 | 46/63 | 1929 | 0.37/1978 |   |
10 | 86 | 59 | 100/75 | 1954 | 49/70 | 1922 | 1.78/1983 |   |
11 | 86 | 59 | 104/76 | 1954 | 50/68 | 1944 | 0.58/1993 |   |
12 | 85 | 59 | 103/75 | 1954 | 47/62 | 1922 | 0.69/1987 |   |
13 | 87 | 60 | 102/71 | 1954 | 44/66 | 1987 | 0.37/1973 |   |
14 | 85 | 59 | 99/72 | 1931 | 47/64 | 1973 | 0.41/1993 |   |
15 | 85 | 58 | 100/70 | 1925 | 46/64 | 1908 | 0.27/1967 |   |
16 | 86 | 59 | 100/74 | 2006 | 47/65 | 1992 | 0.61/1953 |   |
17 | 86 | 59 | 98/71 | 2002 | 46/67 | 1992 | 1.81/2000 |   |
18 | 85 | 60 | 100/72 | 1998 | 49/61 | 1972 | 0.30/1965 |   |
19 | 85 | 59 | 100/74 | 1934 | 46/63 | 1902 | 0.63/1985 |   |
20 | 85 | 59 | 100/82 | 1998 | 45/65 | 1900 | 2.12/1990 |   |
21 | 85 | 59 | 101/72 | 2005 | 48/66 | 1915 | 2.18/1977 |   |
22 | 85 | 59 | 102/77 | 1931 | 47/67 | 1973 | 0.61/1998 |   |
23 | 85 | 59 | 99/75 | 2005 | 47/61 | 1990 | 1.66/2004 |   |
24 | 84 | 59 | 101/74 | 1953,2003 | 49/58 | 2004 | 0.82/1965 |   |
25 | 86 | 59 | 99/72 | 1931 | 49/73 | 1973 | 1.80/1977 |   |
26 | 86 | 60 | 98/76 | 1935 | 48/71 | 1926 | 1.06/1964 |   |
27 | 86 | 60 | 101/70 | 1947 | 48/68 | 1913 | 1.02/1982 |   |
28 | 86 | 60 | 100/72 | 1947 | 52/70 | 1911,2009 | 0.76/1982 |   |
29 | 86 | 60 | 100/73 | 1947 | 46/68 | 1971 | 1.26/1953 |   |
30 | 86 | 59 | 97/72 | 1966 | 45/57 | 1971 | 1.74/1998 |   |
31 | 86 | 59 | 100/69 | 2002 | 47/67 | 2009 | 1.47/1956 |   |
August climatology 
Day | Normal High | Normal Low | Record High | Year of high high | Record Low | Year of low low | rain/year | snow/year |
---|---|---|---|---|---|---|---|---|
1 | 85 | 60 | 100/73 | 1938 | 44/62 | 1995 | 0.45/1956 |   |
2 | 85 | 60 | 99/72 | 2008 | 49/64 | 1995* | 0.69/1976 |   |
3 | 84 | 59 | 98/73 | 1954 | 49/59 | 1915 | 3.06/1951 |   |
4 | 85 | 59 | 98/75 | 1947 | 45/64 | 1927 | 1.79/1999 |   |
5 | 85 | 59 | 98/70 | 1962 | 47/68 | 1928 | 0.98/2002 |   |
6 | 84 | 59 | 101/76 | 1979 | 50/72 | 1921 | 1.59/1997 |   |
7 | 84 | 59 | 99/70 | 1975 | 47/54 | 1939 | 0.38/1988 |   |
8 | 85 | 58 | 101/72 | 1969 | 46/68 | 1939 | 0.25/1963 |   |
9 | 84 | 59 | 101/69 | 1947 | 45/65 | 1939 | 1.00/2001 |   |
10 | 84 | 58 | 97/74 | 1969 | 40/62 | 1912 | 1.40/1968 |   |
11 | 84 | 57 | 97/70 | 1959 | 47/65 | 1974 | 1.91/1994 |   |
12 | 85 | 58 | 99/72 | 1996 | 47/68 | 2004 | 0.53/1990 |   |
13 | 85 | 58 | 97/68 | 2007 | 44/68 | 2007 | 0.82/1975 |   |
14 | 85 | 58 | 99/74 | 1935 | 48/62 | 2004 | 0.93/1961 |   |
15 | 85 | 58 | 97/69 | 1944 | 47/63 | 1978 | 0.87/2008 |   |
16 | 85 | 59 | 100/72 | 2002 | 47/56 | 1975 | 1.31/2008 |   |
17 | 84 | 58 | 97/73 | 1948 | 45/72 | 2008 | 0.88/1997 |   |
18 | 84 | 58 | 98/77 | 2002 | 48/70 | 1987 | 1.32/2003 |   |
19 | 83 | 57 | 95/70 | 1952 | 43/60 | 1939 | 1.42/2004 |   |
20 | 82 | 57 | 95/70 | 1973 | 47/61 | 2004 | 1.65/1982 |   |
21 | 82 | 57 | 97/76 | 1960 | 44/60 | 1920 | 0.26/1999 |   |
22 | 82 | 56 | 97/70 | 1949 | 46/64 | 1966 | 0.60/1984 |   |
23 | 83 | 57 | 97/67 | 1949 | 47/58 | 1945 | 0.41/1952 |   |
24 | 83 | 57 | 102/70 | 1936 | 45/63 | 1968 | 2.00/1992 |   |
25 | 84 | 56 | 95/76 | 1953 | 37/61 | 1910 | 0.29/1949 |   |
26 | 84 | 57 | 96/73 | 1953 | 39/66 | 1910 | 0.37/1980 |   |
27 | 83 | 57 | 96/71 | 1926 | 39/65 | 1910 | 0.18/1953 |   |
28 | 83 | 56 | 96/70 | 1948 | 40/65 | 2004 | 0.27/1997 |   |
29 | 82 | 56 | 97/69 | 1954 | 44/63 | 2004 | 0.47/1952 |   |
30 | 82 | 56 | 96/72 | 1948,2005 | 46/69 | 1964 | 1.83/1967 |   |
31 | 82 | 55 | 96/69 | 1960 | 42/59 | 1932 | 1.93/1951 |   |
September climatology 
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | rain/year | snow/year |
---|---|---|---|---|---|---|---|---|
1 | 83 | 55 | 97/72 | 1955 | 42/61 | 1967 | 0.57/1966 | 0.0 |
2 | 82 | 54 | 100/69 | 1983 | 42/67 | 1974 | 0.92/1966 | 0.0 |
3 | 81 | 53 | 94/75 | 1960 | 33/51 | 1961 | 1.16/1961 | TR/1961 |
4 | 80 | 53 | 96/67 | 1960 | 39/58 | 1961 | 0.50/1971 | 0.0 |
5 | 80 | 53 | 95/69 | 1952 | 40/58 | 1968 | 0.20/1982 | 0.0 |
6 | 81 | 53 | 97/68 | 1959 | 38/50 | 1929 | 0.33/1996 | 0.0 |
7 | 80 | 54 | 93/66 | 1953 | 34/41 | 1929 | 0.48/1963 | 0.0 |
8 | 78 | 53 | 93/66 | 1959 | 35/41 | 1941 | 1.31/2001 | TR/2001 |
9 | 78 | 51 | 94/69 | 1983 | 32/46 | 1941 | 0.48/1980 | 0.0 |
10 | 78 | 50 | 92/65 | 1974 | 35/42 | 1962 | 0.91/2002 | 0.0 |
11 | 77 | 51 | 91/64 | 1974 | 34/43 | 1898 | 0.58/1973 | 0.6/1989 |
12 | 77 | 50 | 93/69 | 1956 | 31/40 | 1974 | 1.24/2008 | 2.7/1974 |
13 | 76 | 50 | 95/69 | 1990 | 35/50 | 1898/99 | 1.56/1982 | 1.0/1993 |
14 | 76 | 49 | 94/63 | 1948 | 32/44 | 1912 | 0.85/1982 | 0.0 |
15 | 75 | 49 | 92/65 | 1948 | 30/44 | 1903 | 0.39/1982 | 0.0 |
16 | 75 | 48 | 93/62 | 2000 | 30/48 | 1912 | 0.30/1971 | TR/1965 |
17 | 76 | 48 | 93/65 | 2000 | 27/36 | 1965 | 1.64/1971 | 18.0/1971 |
18 | 76 | 49 | 93/64 | 1947 | 30/44 | 1971 | 0.89/1993 | 3.0/1971 |
19 | 76 | 49 | 92/65 | 1980 | 22/45 | 1971 | 0.82/1996 | 0.0 |
20 | 75 | 47 | 93/66 | 1956 | 29/36 | 1983 | 1.50/1961 | 2.3/1965 |
21 | 74 | 46 | 89/67 | 2007 | 31/36 | 1912 | 1.07/1995 | 8.3/1995 |
22 | 74 | 47 | 90/63 | 1954 | 23/39 | 1995 | 1.47/1970 | T/1994 |
23 | 73 | 47 | 91/67 | 1947 | 30/39 | 2000 | 0.80/1997 | 1.4/2000 |
24 | 73 | 46 | 92/64 | 1949 | 28/38 | 2000 | 1.44/1959 | 5.1/2000 |
25 | 73 | 45 | 88/66 | 1953 | 24/46 | 1926 | 1.54/1970 | 1.5/1970 |
26 | 71 | 45 | 88/67 | 1956 | 28/45 | 1942 | 0.51/1996 | 3.3/1996 |
27 | 72 | 43 | 92/60 | 1953 | 24/36 | 1908 | 0.50/1976 | 2.8/1996 |
28 | 71 | 44 | 89/63 | 1957 | 23/35 | 1945 | 1.23/1985 | 9.0/1985 |
29 | 71 | 44 | 89/64 | 1964 | 18/35 | 1985 | 1.03/1959 | 10.4/1959 |
30 | 72 | 45 | 91/66 | 1980 | 15/37 | 1985 | 0.82/1991 | 0.5/1959 |
October climatology 
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 72 | 45 | 90/62 | 1953 | 23/36 | 1985 | 3.5/1959 |
2 | 72 | 45 | 84/64 | 1979,2001 | 27/44 | 1959 | 2.8/1959 |
3 | 71 | 44 | 88/60 | 1967 | 30/47 | 1927 | 2.0/1969 |
4 | 71 | 44 | 88/61 | 1922 | 30/37 | 1950 | 10.2/1969 |
5 | 69 | 43 | 90/63 | 1947 | 27/49 | 1991 | 3.0/1969 |
6 | 68 | 42 | 85/61 | 1992 | 28/35 | 1995 | 0.9/2000 |
7 | 70 | 42 | 88/64 | 1956 | 23/42 | 1970 | 3.5/1970 |
8 | 69 | 42 | 86/59 | 1965 | 22/34 | 1970 | 4.1/1990 |
9 | 69 | 42 | 86/64 | 1965 | 24/41 | 1990 | 1.0/1985 |
10 | 69 | 42 | 88/62 | 1910 | 25/38 | 1949 | 0.1/2006 |
11 | 69 | 41 | 87/58 | 1996 | 20/38 | 1977 | 9.7/1969 |
12 | 67 | 40 | 89/58 | 1950 | 20/27 | 1969 | 6.5/1969 |
13 | 68 | 41 | 88/63 | 1989 | 10/30 | 1969 | 2.0/1985 |
14 | 67 | 41 | 85/59 | 1962 | 13/36 | 1969 | 3.0/1966 |
15 | 66 | 40 | 85/57 | 1958 | 20/44 | 1970 | 9.2/1969 |
16 | 65 | 38 | 87/55 | 1991 | 20/35 | 1969 | 12.0/1948 |
17 | 65 | 38 | 85/59 | 2003 | 15/33 | 1999 | 3.7/2006 |
18 | 65 | 38 | 86/57 | 1926 | 19/26 | 1925 | 1.5/2006 |
19 | 63 | 38 | 87/59 | 2003 | 17/30 | 1925 | 1.5/1982 |
20 | 64 | 38 | 87/59 | 1950 | 19/36 | 1916 | 3.2/1949 |
21 | 65 | 38 | 84/60 | 1950 | 12/28 | 1911 | 5.8/2006 |
22 | 63 | 38 | 85/60 | 2003 | 19/28 | 1936 | 3.0/1995 |
23 | 63 | 36 | 86/52 | 2003 | 22/29 | 1906 | 4.8/1975 |
24 | 63 | 36 | 81/55 | 1952 | 19/32 | 1975 | 7.7/1997 |
25 | 62 | 36 | 80/55 | 1959 | 17/32 | 1932 | 22.1/1997 |
26 | 62 | 36 | 81/55 | 1966 | 20/32 | 1923 | 4.1/2006 |
27 | 62 | 36 | 79/54 | 1915 | 21/34 | 1917 | 2.0/1980 |
28 | 61 | 36 | 80/52 | 1933 | 11/30 | 1925 | 3.7/1991 |
29 | 58 | 34 | 83/52 | 1968 | -2/26 | 1917 | 10.2/1961 |
30 | 58 | 34 | 80/56 | 1933 | 6/23 | 1992 | 9.6/1972 |
31 | 58 | 33 | 83/56 | 1950 | 5/21 | 1991 | 4.9/1989* |
November climatology 
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 57 | 34 | 75/52 | 1988 | 10/25 | 1951 | 9.7/1972 |
2 | 56 | 30 | 79/54 | 1931 | -2/18 | 1951 | 6.5/1967 |
3 | 57 | 31 | 77/50 | 1915 | 1/30 | 1991 | 4.8/1990 |
4 | 58 | 32 | 79/51 | 1952 | 14/27 | 1967 | 3.5/1953 |
5 | 57 | 31 | 78/58 | 1952 | 6/31 | 1933 | 6.5/1951 |
6 | 58 | 32 | 77/55 | 1980 | 11/31 | 1938 | 8.2/1990 |
7 | 56 | 32 | 78/54 | 1980 | 9/28 | 1990 | 4.1/1998 |
8 | 56 | 30 | 78/55 | 1978 | 17/28 | 1990 | 12.4/1950 |
9 | 55 | 30 | 75/56 | 1927 | 5/22 | 1950 | 10.0/1985 |
10 | 57 | 30 | 75/56 | 1956,2005 | -3/18 | 1950 | 4.0/1997 |
11 | 54 | 29 | 79/52 | 1989 | -1/7 | 1911 | 5.5/1948 |
12 | 54 | 29 | 78/52 | 1989 | -2/11 | 1911 | 9.0/1979 |
13 | 53 | 29 | 74/53 | 1999 | -6/9 | 1916 | 2.0/1980 |
14 | 55 | 28 | 75/46 | 1905 | -2/28 | 1916 | 16.0/1994 |
15 | 54 | 29 | 75/47 | 1953 | 1/28 | 1997 | 8.0/1987 |
16 | 52 | 28 | 74/48 | 1999 | 2/26 | 1959 | 7.3/1996 |
17 | 52 | 29 | 75/48 | 1981 | 4/25 | 1903 | 5.1/1969 |
18 | 51 | 28 | 78/48 | 2008 | 2/20 | 1903 | 4.5/1961 |
19 | 53 | 28 | 78/56 | 1989 | 6/15 | 1906 | 7.5/1956 |
20 | 52 | 28 | 75/54 | 1939 | 3/23 | 1906 | 22.0/1979 |
21 | 50 | 26 | 72/50 | 1939 | 0/20 | 1929 | 6.9/1992 |
22 | 52 | 25 | 73/49 | 1939/2006 | -7/8 | 1929 | 10.5/1999 |
23 | 52 | 27 | 73/50 | 1939 | -2/15 | 2003 | 12.1/1992 |
24 | 53 | 27 | 70/47 | 1933 | 3/27 | 1918 | 9.3/1992 |
25 | 53 | 29 | 77/50 | 1990 | -8/22 | 1993 | 6.3/1952 |
26 | 51 | 27 | 72/52 | 1960 | -1/27 | 1919 | 13.0/1959 |
27 | 48 | 25 | 75/48 | 1903 | -12/3 | 1919 | 11.5/1983 |
28 | 49 | 24 | 69/52 | 1886 | -12/12 | 1919 | 6.1/2004 |
29 | 49 | 24 | 76/54 | 1899 | 1/25 | 1919 | 11.8/2006 |
30 | 50 | 26 | 68/57 | 1956 | 0/12 | 1975/2006 | 6.0/1986 |
December climatology  
Day | Normal High | Normal Low | Record High | Year | Record Low | Year | snow/year |
---|---|---|---|---|---|---|---|
1 | 49 | 26 | 69/51 | 1995 | -5/9 | 1985 | 3.7/1971 |
2 | 50 | 25 | 71/48 | 1926 | -9/13 | 1919 | 3.5/1955 |
3 | 49 | 26 | 70/50 | 1941 | -2/25 | 1919 | 5.8/1973 |
4 | 48 | 25 | 75/48 | 1965 | -1/8 | 1909 | 7.2/2008 |
5 | 47 | 24 | 70/46 | 1965 | -12/7 | 1972 | 8.4/1972 |
6 | 48 | 23 | 69/43 | 1981 | -16/5 | 1972 | 8.0/1964 |
7 | 46 | 23 | 68/45 | 1984 | -15/7 | 1927 | 12.4/1988 |
8 | 45 | 21 | 71/43 | 1940 | -9/7 | 1932 | 4.7/1967 |
9 | 44 | 21 | 74/48 | 1957 | -20/-2 | 1919 | 10.5/1985 |
10 | 46 | 21 | 70/46 | 1915 | -12/3 | 1932 | 3.2/1963 |
11 | 46 | 22 | 71/46 | 1934 | -18/-3 | 1932 | 6.7/2007 |
12 | 46 | 22 | 67/47 | 1921 | -19/14 | 1932 | 7.1/1967 |
13 | 44 | 21 | 74/53 | 1921 | -10/5 | 1926 | 4.5/1987 |
14 | 43 | 20 | 69/45 | 1924 | -11/5 | 1926 | 7.2/1965 |
15 | 45 | 20 | 70/46 | 2006 | -15/7 | 2008 | 8.8/1988 |
16 | 45 | 22 | 69/53 | 1941 | -7/12 | 2008 | 4.8/1992 |
17 | 44 | 21 | 76/59 | 1980 | -9/10 | 1964 | 4.6/1975 |
18 | 44 | 22 | 69/45 | 1979 | -14/13 | 1909 | 4.9/1973 |
19 | 45 | 21 | 69/50 | 1979 | -17/10 | 1924 | 2.8/1998 |
20 | 45 | 22 | 70/47 | 1954 | -16/3 | 1924 | 15.7/2006 |
21 | 44 | 22 | 66/44 | 1982 | -20/8 | 1990 | 10.3/2006 |
22 | 44 | 23 | 71/47 | 1982 | -24/0 | 1990 | 3.9/2004 |
23 | 44 | 22 | 71/54 | 1955 | -13/2 | 1990 | 3.7/1987 |
24 | 46 | 22 | 70/62 | 1955 | -18/-2 | 1924 | 18.0/1982 |
25 | 45 | 21 | 68/47 | 2005 | -10/12 | 1983 | 5.9/2007 |
26 | 44 | 20 | 70/44 | 1947 | -6/10 | 1916 | 7.0/1988 |
27 | 44 | 20 | 74/44 | 1980 | -10/8 | 1916 | 12.6/1987 |
28 | 46 | 21 | 67/44 | 1980 | -8/15 | 1924 | 9.0/1979 |
29 | 45 | 22 | 69/44 | 1965 | -10/11 | 1983 | 12.5/2006 |
30 | 44 | 21 | 71/49 | 1980 | -11/11 | 1990 | 4.2/1976 |
31 | 42 | 18 | 66/48 | 1904 | -18/6 | 1923 | 8.0/1994 |
See the Boulder weather log for more details
NOTE! Records and daily data are sometimes from different sources and may not agree. I attempt to fix discreprancies when possible.
[Pages are for curiosity only; there are no guarantees that the data is correct]