Boulder Colorado Climatology: Daily records of Temperature and Snowfall: NOAA Physical Sciences Laboratory

Boulder Daily Climatology and Daily Records

The average high and low temperature as well as the record for each date for the high (highest daily maximum and highest daily minimum) as well as record lowest daily minimum and daily maximum are available for each date(divided into monthly sections). Snow records are from 1948 onward and temperature from 1897. Hail is counted for the purposes of records. Temperatures are in degrees Fahrenheit and snow depths are in inches as those are the unit of measurement.

Separate NIST site records are available: The site has been in its current location at NIST since Apr 1990:

Jump to Month

January	February	March	April	May	June
July	August	September	October	November	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.

Plot of daily average max and min temperature

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	1918,1997	-10/4	1911	8.5/1949
4	43	19	67/44	1927	-14/8	1959	10.7/2014
5	44	19	69/44	2012,1956	-13/8	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	72/47	1953	-11/9	1973	4.1/1993
10	44	20	70/55	1990	-13/9	1962	7.4/2001
11	43	18	69/43	1953	-18/-2	1963	4.7/2012
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	1986,2009,2017	-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	7.1/2017
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	9.8/2014
27	45	19	72/49	2015	-6/4	2009	5.7/2014
28	45	20	68/50	2011	-9/7	1903	8.6/1989
29	44	20	70/44	1931	-12/-3	1951	6.5/1994
30	44	19	71/47	1986	-6/8	1951	5.8/2002
31	45	20	69/53	1989	-9/4	1985	7.6/2005

* snow record not from official dataset Back to top

February climatology

Day	Normal High	Normal Low	Record High	Year	Record Low	Year	snow/year
1	44	20	71/48	1934	-15/6	1951	5.4/2016
2	44	20	75/49	2020	-17/1	2011	11.2/2016
3	44	22	74/47	1954	-17/-5	1989	16.4/2012
4	46	21	73/46	1935	-18/-12	1989	8.6/2020
5	46	22	75/46	1963	-24/6	1989	3.3/1975
6	46	22	70/45	2015	-16/5	1914	5.7/2019
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/-7	1933	6.0/1953
10	47	22	76/57	2017	-15/12	1933	5.5/1988
11	47	22	75/49	1962	-15/1	1905	8.5/2020
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	1982,2017	-12/10	1903	7.4/1965
16	47	23	73/42	2017	-11/5	1900	8.1/2015
17	47	23	68/48	1970	-11/10	1936	5.5/1988
18	46	23	73/46	2016	-14/9	2006	6.5/1955
19	46	22	71/49	1981	-4/16	2006	7.6/1987
20	47	23	74/48	1981	-6/15	2018	8.0/1971
21	46	23	77/46	1982	4/15	1911	6.4/2015
22	48	23	73/45	1982	-1/15	1911	8.5/1960,2015
23	47	23	74/52	2002	-5/16	1899	7.0/1997
24	46	23	72/54	1981	-4/11	2003	8.0/2013
25	47	24	75/58	1986	-6/17	1935	5.9/2002
26	47	23	72/44	1932	-6/9	1962	9.5/2015
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	Record Low	Year	snow/year
1	48	24	73/51	2008	-1/17	1927	9.0/2002
2	49	24	75/51	1901	-6/15	2002	4.0/2020
3	47	24	73/46	1921	-4/14	1943	7.0/1964
4	45	23	74/49	2009	-5/10	2019	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	2007	4/25	1950	7.0/1963
14	49	26	76/51	1925	4/20	1925	8.4/1997
15	49	26	78/52	2015,2017	2/17	1906	4.0/1960
16	53	27	80/50	2015	-4/12	1906	8.0/1983
17	54	28	75/54	1908	0/18	1924	5.6/1988
18	53	28	80/49	2017	-5/14	1923	16.9/1998
19	52	28	79/62	1907	-1/16	1965	12.3/2010
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	1967,2012	3/18	1898	16.4/2016
24	53	30	76/51	1998	2/?	1965	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	2010	6/29	1926	18.5/1970
31	57	30	81/56	2012	1/21	1899	8.7/1988

* snow record not from official dataset Back to top

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	82/51	2011	-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	8.2/2017
5	58	32	80/52	1991	5/32	1939	6.8/1990
6	59	33	80/54	1991	4/22	1938	4.1/2018
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	1977,2019	8/28	1973	13.1/2013
10	59	34	80/55	1960	2/29	2013	11.1/1995
11	58	34	81/56	1982	9/26	1940	12.0/1953
12	59	34	78/50	1908	2/33	1997	8.8/2020
13	61	35	83/52	2006	14/27	1959	10.3/1974
14	62	36	80/57	1963	10/27	2020	3.6/1949
15	62	36	85/54	1985	15/33	1945	10.4/2013
16	61	35	81/52	1958	21/31	1947	6.5/2016
17	62	36	83/55	1987	17/31	1901	11.8/2016
18	62	36	84/53	1987	10/31	2013	16.9/2020
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	7.5/2013
24	62	38	87/56	2012	18/32	2013	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	Record Low	Year	snow/year
1	65	39	86/55	1943	23/34	1909	10.7/2013
2	65	41	86/56	1981	17/35	2013	2.5/1954
3	65	40	86/60	1947	20/30	1907	0.5/1967
4	67	41	88/59	2000,2012	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	28/41	2010	0.9/2010
8	66	42	86/62	2011	30/39	2010	0
9	68	42	88/59	1916	25/34	2002	2.3/2019
10	67	43	88/62	1916	26/29	1979	5.2/2003
11	68	42	88/61	1963	21/45	1946	1.7/2014
12	68	42	88/60	1962	24/33	1953	5.1/2014
13	68	42	89/65	1988	27/38	1953	T/2010
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	5.3/2017
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	5.1/2019
22	70	45	89/66	2012	32/35	1931,2019	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	1969,2013	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

>td>hail

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	92/63	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 (hail)
8	76	50	98/64	1985	34/58	2007
9	77	50	96/65	1985	37/56	2014
10	77	51	97/70	1952	37/49	1975
11	77	53	98/69	2013	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	98/68	1946	38/49	1912
18	80	53	98/70	1936,2012	41/53	1945
19	81	53	97/74	1934	38/56	1976
20	82	54	97/68	2017	39/67	1946
21	81	55	99/68	2016	41/60	2000	hail
22	83	55	98/81	1954,2012	40/56	2004	Tr/1996 (hail)
23	84	56	104/74	1954	40/64	2019
24	83	56	101/80	2012	39/55	1906	Tr/2006 (hail)
25	84	56	101/69	2012	42/61	1958
26	84	56	101/69	1971,1994	42/61	1968,2003
27	86	57	100/69	1990	41/70	1985
28	86	58	98/73	2018	47/61	1945
29	85	57	99/73	1953	45/58	1978
30	84	57	99/70	1994	41/58	1935

July climatology

Day	Normal High	Normal Low	Record High	Year	Record Low	Year	rain/year
1	84	56	101/75	2002	46/67	1995,2018/td>	0.64/1970
2	85	57	99/71	1990	45/67	1915	0.71/2019
3	85	58	98/73	1964	43/57	1922	0.76/1972
4	85	57	98/73	1989,2011	40/56	1921	0.52/1972
5	85	58	99/76	1989	42/69	1972	0.41/2010
6	85	57	100/69	1973	44/62	1931	0.48/2015
7	85	58	100/72	1951	41/62	1904	1.08/2010
8	85	58	100/75	1989	46/67	1929	1.47/1967
9	86	58	99/70	1976	46/63	1929	1.98/2012
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	0.45/2018
16	86	59	100/74	2006	47/65	1992	0.67/2012
17	86	59	98/71	2002,2010	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	2.56/2014
31	86	59	100/69	2002	47/67	2009	1.47/1956

August climatology

Day	Normal High	Normal Low	Record High	Year	Record Low	Year	rain/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	1975,2009	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	96/70	2013,2019	43/60	1939	1.42/2004
20	82	57	98/70	2019	43/61	2016	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	98/69	2011	47/58	1945	0.41/1952
24	83	57	102/70	1936	45/63	1968	2.00/1992
25	84	56	97/76	2019	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	0.18/1953,2014
28	83	56	96/70	1948	40/65	2004	0.34/2014
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	1960,2011	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	98/72	2019	42/61	1967	0.57/1966	0.0
2	82	54	100/69	1983,2019	42/67	1974	0.92/1966	0.0
3	81	53	94/75	1960,2013	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	97/69	2019	40/58	1968	0.96/2018	0.0
6	81	53	97/68	1959	38/50	1929	0.33/1996	0.0
7	80	54	93/66	1953,2013	34/41	1929	1.02/2011	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	94/65	2012	35/42	1962	1.02/2013	0.0
11	77	51	92/64	2016	34/43	1898	1.92/2013	0.6/1989
12	77	50	93/69	1956	31/40	1974	9.08/2013	2.7/1974
13	76	50	95/69	1990	31/50	1993	2.44/2013	1.0/1993
14	76	49	94/63	1990	28/44	1993	0.85/1982	0.0
15	75	49	93/65	2018	30/44	1903	1.94/2013	0.0
16	75	48	93/62	2000	30/47	1912	0.49/2013	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	93/65	2010	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	92/66	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	1956,2011	28/45	1942	0.51/1996,2012	3.3/1996
27	72	43	92/60	1953	24/36	1908	0.50/1976	2.8/1996
28	71	44	90/63	2010	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	85/64	2012	27/44	1959	2.8/1959
3	71	44	88/60	1967	30/47	1927,2009	2.0/1969
4	71	44	88/61	1922	30/37	1950	10.2/1969
5	69	43	90/63	1947	27/42	1991	3.0/1969
6	68	42	85/61	1993	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	24/38	1990	6.0/1985
10	69	42	88/62	1910	15/38	2009	4.8/2009
11	69	41	87/58	1996	15/29	2019	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	8.9/2018
15	66	40	85/61	1958	13/44	2018	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	3.2/2013
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	83/58	2014	19/32	1975	7.7/1997
25	62	36	85/55	2017	17/32	1932	22.1/1997
26	62	36	81/55	1966	19/32	2009	11.5/2011
27	62	36	82/54	2016	14/34	2011	3.9/2019
28	61	36	80/60	2016	11/28	1925	16.7/2009
29	58	34	83/55	1968	-2/21	1917	10.2/1961
30	58	34	80/56	1933	3/23	2019	9.6/1972
31	58	33	83/56	1950	3/21	2019	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	8.6/2011
3	57	31	77/50	1915,2015	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	79/56	2019	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	12.6/2018
12	54	29	78/52	1989	-2/10	1911	9.0/1979
13	53	29	74/53	1999	-11/9	2014	2.0/1980
14	55	28	75/46	1905	-2/28	1916	16.0/1994
15	54	29	79/49	2016	1/25	1997	8.0/1987
16	52	28	80/56	2016	-1/26	2014	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	2012	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	72/47	2017	3/27	1918	9.3/1992
25	53	29	77/50	1990	-8/22	1993	6.3/1952
26	51	27	73/52	2017	-1/27	1919	20.7/2019
27	48	25	76/56	2017	-12/3	1919	11.5/1983
28	49	24	70/52	2014	-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	7.6/2011
2	50	25	71/48	1926	-9/13	1919	6.9/2009
3	49	26	70/50	1941	-2/25	1919	8.0/2011
4	48	25	75/48	1965	-1/8	1909,2009	7.2/2008
5	47	24	71/46	2012	-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	71/47	1940	-9/7	1932	4.7/1967
9	44	21	74/48	1957	-20/-2	1919	10.5/1985
10	46	21	70/47	1915	-12/3	1932	3.2/1963
11	46	22	71/46	1934	-18/-3	1932	6.7/2007
12	46	22	68/47	2017	-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	11.3/2015
16	45	22	69/53	1941	-7/12	2008	4.8/1992
17	44	21	76/55	1980	-9/10	1964	5.2/2016
18	44	22	69/45	1979	-14/13	1909	4.9/1973
19	45	21	69/50	1979	-17/10	1924	3.7/2012
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	14.6/2011
23	44	22	71/54	1955	-13/2	1990	5.9/2009
24	46	22	70/62	1955	-18/-2	1924	18.0/1982
25	45	21	68/47	2005	-10/12	1983	6.7/2012
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	6.2/2010
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 discrepancies when possible.