Boulder, CO Monthly Means: Temperature

Units are degrees Fahrenheit

• Skip to latest available data
• Plot of monthly mean temperature

Year	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	Average
1897	28.3*	32.3*	36.4*	48.0*	60.2	64.6	70.6	69.0	66.8	52.2	41.8	30.6	X
1898	30.7	38.8	35.7	49.2	51.9	66.6	72.2	73.0	62.1	49.0	36.6	29.3	49.6
1899	31.6	18.0	34.1	49.1	57.0	65.9	69.0	70.4	66.0	50.5	47.7	35.8	49.6
1900	37.0	31.6	43.2	45.8	59.8	69.6	70.7	72.2	61.6	57.2	44.6	38.9	52.7
1901	36.4	29.4	40.0	47.1	59.5	66.0	75.2	71.3	61.4	53.6	47.8	35.0	51.9
1902	32.1	38.0	39.1	48.8	59.2	66.8	69.2	71.8	60.8	55.0	42.0	36.5	51.6
1903	37.4	22.8	37.1	48.3	54.5	61.2	71.0	70.6	61.0	52.9	42.8	39.8	50.0
1904	32.4	41.4	43.6	49.4	55.4	61.2	67.8	70.2	64.4	54.8	48.4	37.6	52.2
1905	29.4	27.0	44.5	46.4	52.5	66.0	68.0	72.4	66.0	48.6	43.9	36.2	50.1
1906	39.0	37.6	29.8	50.3	57.4	63.0	67.0	68.9	62.1	51.9	38.6	41.3	50.6
1907	34.2	42.8	48.2	46.8	50.8	63.8	70.2	70.6	63.9	54.2	40.9	36.8	51.9
1908	37.4	38.0	45.8	52.5	54.6	64.0	69.4	67.6	66.3	49.0	40.0	34.3	51.6
1909	37.6	35.0	33.9	41.9	53.8	65.2	71.2	72.3	62.2	53.9	43.8	19.9	49.2
1910	30.6	30.2	54.0	54.8	55.8	66.8	73.7*	70.2*	63.2	54.5	45.8	35.6	X
1911	38.6	30.8	45.6	49.2	58.1	68.9	68.6	69.3	64.4	47.6	37.0	34.5*	X
1912	33.1	31.1	32.0	45.0	56.0	62.8	68.3	69.4	54.8	50.0	42.9	31.4	48.1
1913	29.3	24.1	35.3	50.9	56.0	67.4	64.7	71.6	58.5	47.5	45.1	26.7	48.1
1914	37.7	31.4	41.6	48.8	57.4	68.4	70.8	70.0	65.8	54.4	47.6	24.5	51.5
1915	30.0	36.3	32.8	52.0	54.4	63.0	68.2	65.2	61.6	55.0	44.2	33.8	49.7
1916	25.4	37.0	48.6	50.6	59.2	69.2	76.5	69.2	63.5	50.2	37.6	26.6	51.1
1917	29.4	34.4	32.9	45.3	50.6	68.6	76.8	71.3	65.2	50.3	47.9	39.0	51.0
1918	26.2	37.6	47.9	44.2	61.4	71.0	74.6	75.4	61.4	55.0	37.8	32.6	52.1
1919	36.4	32.4	40.5	50.3	58.5	68.5	76.9	76.2	68.4	52.0	35.8	33.2	52.4
1920	35.6	33.7	39.0	39.8	55.7	63.8	70.7	67.8	61.6	52.3	36.2	33.1	49.1
1921	34.3	37.4	45.5	46.0	56.8	66.2	71.6	70.4	64.3	57.2	44.4	36.2	52.5
1922	26.4	31.0	40.6	45.7	57.6	70.4	70.6	72.6	66.7	52.8	37.7	36.1	50.7
1923	38.2	29.0	33.6	47.2	55.4	66.8	70.4	67.0	59.8	43.6	41.8	32.3	48.8
1924	29.8	40.9	29.1	47.9	54.2	68.5	72.0	74.0	57.4	52.0	43.8	24.8	49.5
1925	30.5	41.0	44.1	51.5	58.6	65.9	73.2	68.4	63.2	41.5	40.2	32.1	50.9
1926	31.4	39.0	37.8	46.5	57.8	65.4	70.4	71.2	61.0	55.2	43.0	30.9	50.8
1927	36.3	38.4	37.0	49.3	59.2	63.4	69.4	65.4	61.0	54.4	44.7	26.6	50.4
1928	36.3	32.7	39.6	45.9	56.8	60.4	69.2	69.0	63.0	51.6	38.2	31.6	49.5
1929	26.5	23.3	40.0	47.0	55.6	67.4	73.6	72.3	58.6	52.6	32.6	37.5	48.9
1930	16.4	41.8	37.6	55.6	55.4	69.2	73.0	69.6	63.0	49.9	41.4	32.4	50.4
1931	35.4	38.4	37.2	48.2	55.5	70.2	74.9	71.6	66.6	54.2	38.1	34.7	52.1
1932	29.7	39.6	32.8	50.6	59.2	64.8	72.8	71.3	63.2	49.6	43.4	22.8	50.0
1933	36.3	29.0	43.6	46.2	54.8	71.8	75.4	69.4	66.5	57.4	46.4	43.8	53.4
1934	39.0	37.8	45.5	51.7	64.2	70.1	76.6	72.7	60.9	57.1	44.4	36.8	54.7
1935	38.7	38.0	43.0	45.7	49.4	64.8	73.2	71.3	63.2	51.3	36.6	33.8	50.8
1936	32.0	26.4	41.8	50.0	59.8	69.1	75.2	72.0	63.6	49.2	42.5	35.2	51.4
1937	18.0	32.7	37.9	47.8	58.2	63.6	72.4	73.9	65.0	53.2	40.4	32.6	49.6
1938	33.7	35.6	41.3	48.5	53.4	65.8	71.3	72.6	64.4	53.9	35.6	32.1	50.7
1939	34.6	25.9	41.4	48.7	59.5	66.3	73.5	68.6	63.4	51.4	41.4	39.2	51.2
1940	23.4	34.4	42.6	45.5	57.8	68.3	71.5	68.2	61.2	52.8	34.7	32.2	49.4
1941	32.1	34.7	33.9	42.6	57.7	62.2	69.2	67.2	57.2	47.6	42.2	33.9	48.4
1942	28.5	23.8	35.9	49.1	54.4	63.7	72.2	69.8	60.2	49.4	42.7	37.2	48.9
1943	33.8	39.7	35.5	54.3	52.4	65.4	73.6	72.9	61.4	52.8	41.9	34.0	51.5
1944	31.8	31.8	33.2	42.1	56.7	64.1	68.9	70.6	61.6	53.4	41.7	32.5	49.0
1945	33.6	33.4	40.6	41.4	56.0	60.3	70.8	70.4	58.8	54.4	42.8	31.2	49.5
1946	32.8	37.4	45.3	55.0	51.2	67.2	72.0	69.2	61.9	47.8	37.0	38.4	51.3
1947	32.6	31.2	36.5	46.4	55.0	62.0	74.1	75.8	69.4	57.6	34.9	37.0	51.0
1948	31.0	31.0	35.2	53.2	60.1	68.2	75.2	75.0	69.7	55.0	39.9	33.3	52.2
1949	21.9	34.1	42.1	53.3	60.4	67.7	75.0	73.7	66.5	51.3	53.1	37.0	53.0
1950	32.9	42.2	41.2	49.8	55.5	69.3	71.4	71.9	62.0	62.0	42.5	40.2	53.4
1951	31.5	37.9	37.5	46.7	59.3	62.4	74.9	72.0	63.5	51.6	40.6	31.8	50.8
1952	36.0	38.1	36.3	51.0	58.7	74.7	75.9	72.5	68.6	57.3	37.2	36.4	53.6
1953	43.5	36.8	46.1	45.2	55.3	71.9	75.8	73.6	69.8	57.6	46.1	35.5	54.8
1954	39.8	47.6	37.2	55.9	58.3	71.5	78.3	75.0	68.0	51.5	47.5	39.7	55.9
1955	31.0	29.9	38.4	52.8	60.6	65.1	76.6	75.0	66.6	57.0	38.9	37.0	52.4
1956	37.4	30.9	42.7	49.2	62.0	75.0	74.2	72.0	69.4	58.4	41.3	39.8	54.4
1957	27.6	42.1	40.7	43.6	55.1	67.9	75.8	73.6	63.4	52.5	40.3	44.1	52.2
1958	37.0	39.7	33.5	46.4	64.3	70.3	71.7	74.8	65.8	56.2	42.6	37.3	53.3
1959	32.6	31.6	40.5	47.0	57.1	70.6	71.9	73.0	60.4	49.6	40.6	39.0	51.2
1960	31.3	28.4	40.3	52.3	59.6	71.0	74.6	73.9	66.4	54.5	43.9	35.5	52.6
1961	36.9	39.9	40.0	48.2	58.9	67.7	72.9	72.5	57.5	52.8	37.9	30.3	51.3
1962	25.3	34.7	37.1	52.8	61.5	66.5	72.1	73.1	63.6	57.5	45.8	37.9	52.3
1963	23.5	40.9	41.2	51.9	62.4	69.9	77.0	71.0	68.3	60.1	44.1	33.3	53.6
1964	35.4	32.0	36.2	48.8	61.0	66.5	77.0	71.4	64.4	55.8	41.8	36.4	52.2
1965	38.4	32.7	30.8	52.0	58.5	66.5	73.0	70.7	55.9	57.9	45.7	38.5	51.7
1966	31.4	31.3	46.3	48.5	63.5	67.5	77.7	71.6	54.5	53.6	43.2	34.1	51.9
1967	36.6	37.9	46.4	51.0	55.4	62.2	73.0	70.6	63.8	55.6	41.5	28.2	51.9
1968	33.7	36.6	44.6	45.8	55.6	69.7	72.6	70.0	63.3	55.3	38.5	32.7	51.5
1969	36.3	36.6	34.7	53.9	61.3	62.2	75.3	74.3	66.2	41.8	41.8	36.4	51.7
1970	33.9	40.9	36.8	45.1	60.9	66.0	73.4	73.5	60.9	47.6	41.6	35.7	51.4
1971	34.8	32.9	40.2	47.9	54.5	69.1	71.5	72.2	58.9	50.7	41.2	32.9	50.6
1972	32.7	40.2	47.5	49.6	56.9	68.1	69.9	69.0	62.0	51.6	34.0	27.9	50.8
1973	29.2	34.8	38.9	43.1	55.9	67.8	70.0	72.7	59.4	54.9	39.6	35.2	50.1
1974	28.7	37.3	44.0	47.6	61.3	68.0	73.3	68.7	60.2	54.2	39.9	32.7	51.3
1975	33.0	32.8	39.3	44.7	54.8	64.3	72.1	71.2	60.8	55.1	39.3	38.0	50.5
1976	32.5	41.4	38.5	49.2	56.4	66.3	73.2	69.7	60.8	49.4	39.3	36.6	51.1
1977	28.2	39.0	39.5	49.5	59.6	71.2	73.7	68.6	65.5	53.8	41.6	38.0	50.5
1978	27.2	29.8	43.3	49.2	55.7	66.2	73.7	69.5	65.0	54.0	40.2	29.1	50.2
1979	22.6	37.4	42.6	50.1	54.7	65.9	73.8	67.9	64.9	56.1	35.1	38.9	50.8
1980	29.5	36.5	38.9	47.7	55.6	71.7	74.7	71.9	65.7	52.6	43.8	44.1	52.7
1981	29.0	29.3	42.2	56.7	55.1	69.1	71.7	68.7	64.5	50.7	46.2	36.9	51.7
1982	33.7	35.5	43.9	50.1	55.9	62.3	71.8	72.6	61.4	50.5	39.2	35.5	51.0
1983	38.1	41.8	38.7	43.5	53.1	62.6	72.4	74.8	65.4	53.7	40.5	20.7	50.4
1984	29.8	35.8	40.1	43.8	60.5	65.6	73.5	71.5	61.0	45.8	40.8	33.9	50.2
1985	26.8	29.5	41.6	52.0	59.7	68.6	72.2	72.5	59.5	50.4	31.1	31.8	49.6
1986	42.3	37.6	48.8	50.7	56.9	69.2	71.6	70.7	59.3	50.3	40.7	33.5	52.6
1987	34.3	37.0	39.8	52.5	59.0	68.6	72.7	69.0	61.7	52.8	41.0	30.8	51.6
1988	28.9	35.8	40.9	51.6	59.3	70.9	72.8	71.9	X	54.8	41.6	32.8	X
1989	36.5	24.1	44.9	X	X	X	X	X	X	X	X	X	X
1990	X	X	X	48.0	54.5	70.0	68.6	68.8	64.7	53.7	45.2	27.3	X
1991	29.9	40.9	42.8	47.8	58.2	66.6	70.5	69.2	61.7	52.1	36.8	35.3	51.0
1992	35.9	40.6	43.3	54.3	59.1	62.9	68.3	66.3	64.4	54.1	34.1	29.2	51.0
1993	28.3	30.6	42.4	47.6	57.5	64.5	69.5	67.3	58.8	48.7	35.6	35.4	48.9
1994	35.5	31.9	43.9	47.6	60.8	70.0	71.2	70.9	65.0	50.6	36.6	36.1	51.7
1995	34.5	38.3	42.1	45.1	50.9	62.4	70.5	74.0	60.4	50.5	45.0	36.3	50.8
1996	29.7	37.7	37.9	50.4	58.9	66.9	71.5	69.5	60.8	53.1	40.6	36.5	51.1
1997	31.3	32.8	45.5	42.8	57.4	66.5	71.4	68.7	64.0	52.7	37.9	33.9	50.4
1998	36.5	36.4	38.7	46.5	58.8	62.1	72.8	70.7	67.1	50.4	44.0	32.2	51.4
1999	36.4	42.1	46.0	44.5	55.6	64.8	73.5	69.3	58.5	51.9	48.0	36.9	52.3
2000	36.4	41.0	42.9	51.2	61.0	67.4	74.7	73.0	63.1	49.6	31.4	31.2	51.9
2001	33.0	32.3	40.8	50.7	58.4	68.9	75.0	71.8	65.0	53.8	43.9	35.0	52.4
2002	33.1	36.0	37.5	52.9	56.2	70.5	76.8	71.3	64.0	45.9	40.3	36.6	51.8
2003	40.2	31.6	43.7	50.6	57.4	62.8	75.9	72.9	60.5	57.4	39.0	36.4	53.4
2004	35.4	33.6	48.2	49.2	59.9	62.7	69.2	66.4	62.9	51.9	39.7	36.5	51.3
2005	35.5	37.9	42.0	48.4	57.6	65.4	75.1	69.7	66.2	52.6	45.0	33.3	52.4
2006	40.7	33.7	39.4	53.9	61.0	71.6	74.4	71.6	58.4	51.0	43.4	35.3	52.9
2007	27.2	34.6	47.6	47.9	58.0	67.7	74.8	73.7	64.5	55.2	44.9	30.2	52.2
2008	31.6	36.1	40.8	47.8	57.1	66.1	75.0	69.6	60.9	46.0	46.0	31.1	50.7
2009	38.2	39.7	44.3	47.3	59.3	63.0	69.6	69.6	63.1	44.5	43.8	26.7	50.8
2010	33.0	30.1	42.7	48.8	53.9	66.9	72.5	72.4	66.6	55.0	39.8	37.2	50.8
2011	33.1	32.0	45.2	48.9	53.7	67.6	73.5	75.1	63.4	52.9	42.3	32.2	51.7
2012	38.9	32.3	50.8	54.3	60.2	74.2	74.8	73.2	66.0	50.8	46.1	33.7	54.6
2013	33.0	32.1	40.5	43.8	57.7	69.9	72.2	72.2	65.1	47.8	43.2	31.5	50.8
2014	34.6	32.0	43.6	49.8	56.6	66.2	72.2	69.2	63.8	55.3	38.3	33.9	51.3
2015	36.5	36.6	46.1	50.1	52.4	68.3	70.3	70.5	69.4	56.2	40.8	33.1	52.5
2016	34.1	40.9	43.0	49.0	54.1	70.5	74.0	70.4	64.9	58.8	47.5	32.0	53.3
2017	32.2	42.3	50.3	48.9	55.7	68.7	73.9	69.0	63.5	51.5	47.5	36.4	53.3
2018	37.7	32.5	43.4	49.1	59.7	69.9	72.5	70.9	66.7	50.4	39.4	33.8	52.1
2019	34.9	31.0	37.2	50.2	51.2	64.6	73.1	73.8	67.6	45.7	39.1	35.7	50.3
2020	36.2	32.4	43.0	47.6	59.0	69.3	73.8	74.2	64.7	50.9	44.8	35.9	52.7
2021	34.6	28.0	40.4	46.7	55.3	69.4	73.0	72.1	67.5	53.6	48.0	40.4
2022	33.9	30.7	41.7	49.0	57.1	68.3	74.9	72.8	67.0	53.3	35.9	32.0
2023	30.1	34.3	36.9	48.1	57.7	63.3	72.6	71.9	65.4	51.6	44.6	38.3
2024	30.2	38.9	41.9	50.8	56.2	71.1	73.5	73.2	67.6	58.1	40.9	40.6
2025	27.9	33.6	47.7	50.0	56.3	68.4	73.6	72.3	64.6	54.4

1991-2020 Climatology (at NIST)

Type	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	Avg
Mean	34.42	35.40	43.13	48.87	57.22	66.95	72.72	70.91	63.66	51.78	41.48	33.98	51.71
STD	3.23	3.49	3.39	2.70	2.68	3.01	2.16	2.29	2.67	3.27	4.03	2.52	--

Data was obtained from GCPS (1893-1987) and the local station report. *'d values from a slightly different source