BOULDER, CO

Average of Minimum Temperature (Degrees Fahrenheit)

(050848)

File last updated on April 19, 2024
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		27.76	a	27.63	a	31.49	i
1894	21.05	j	16.50	j	28.97	a	36.76	a	-----	z	-----	z	56.46	c	54.58		-----	z	-----	z	-----	z	21.35		39.63	g
1895	15.00	c	10.96	c	23.93	b	36.13		42.86	b	47.03		50.30	u	-----	z	-----	z	-----	z	-----	z	-----	z	29.32	f
1896	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1897	-----	z	-----	z	-----	z	-----	z	50.73	a	55.27		59.97	a	59.84		57.89	b	42.97	b	30.68	e	21.31	b	47.33	d
1898	21.48		28.96	a	25.38	b	38.48	a	43.03		56.20		62.29		61.77		50.59	a	37.20	a	25.62	a	19.39		39.20
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	20.87	a	26.18		28.35		36.43		47.42		53.77		57.17	a	59.48		46.93		44.29		30.18	b	25.35		39.70
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	20.55	b	28.55		29.77	a	37.30		44.03		50.40		56.00		57.39		51.90		42.48		35.83		26.61		40.07
1905	19.27	a	16.14		34.26		35.71	b	42.35		54.67		56.68		59.90		52.90		36.94		33.29	b	25.63	d	38.98
1906	27.68		24.93		20.48		38.53		45.55		49.73		56.83	a	57.26		50.83		38.53	a	28.30		30.68		39.11
1907	22.30	a	30.86		35.90	a	34.28	a	40.81		51.70		58.03		59.00		52.10		42.29		29.43		26.35		40.25
1908	26.03	a	25.76		34.16		39.52	a	41.77		51.57		57.97		56.87		53.40		38.29		30.53		23.45		39.94
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	17.46	c	17.61		43.10	a	42.07	b	44.42		53.57		-----	z	-----	z	48.28	a	38.58		32.67		23.60	a	36.14	b
1911	24.90	a	18.75		31.71		36.03		44.45		55.17		56.50	a	54.45		49.87		34.48		23.10		-----	z	39.04	a
1912	-----	z	-----	z	20.61	h	34.27		43.26	d	50.85	d	56.00		56.55		42.23		36.41	b	28.93	c	18.26	d	40.75	c
1913	15.93	c	12.60	c	23.07	c	35.52	c	44.77	a	52.50		56.93	a	59.07	a	47.00		34.36	c	32.37		13.39	c	35.63
1914	24.57	a	17.71	d	26.89	c	36.11	b	45.70	a	54.60		58.13		57.03		50.53		41.10		33.10		13.13		38.22
1915	16.77	a	24.63	a	22.71		40.97		41.74		50.03		54.94		53.55		48.34	a	40.55		32.11	c	19.90		37.19
1916	11.87	a	23.14		35.03		38.80		46.17	a	57.13		66.00		59.81		50.87		38.27	a	27.14	b	16.94		39.26
1917	18.84		24.61		22.23	a	33.63		40.48		54.10		63.13		59.03		52.73		34.45		35.80		25.63	a	38.72
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		57.72	a	40.55	i	21.85	c	13.68	f	42.10	b
1920	20.35		20.69		25.39		28.17		42.48		50.62	a	55.90		53.73	a	46.67	c	38.36	c	23.55	a	21.00	a	35.58
1921	22.53	a	24.64		31.42		33.17		43.45	b	53.47		56.77		56.77		48.00	a	41.71		29.57		22.93	a	38.70
1922	12.71		18.52	c	26.32		33.00		44.23		54.79	a	57.84		58.50	a	51.62	a	38.60	a	26.13		22.68		37.08
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		53.93	a	59.83	a	61.81		44.93		37.39		29.03		11.70	a	36.96
1925	17.10		26.82		28.42		38.07		46.55		52.47		60.23		56.19		49.53		31.50	a	28.79	a	21.71		38.11
1926	21.93	a	27.41	a	28.10		36.47		46.77		53.47		57.16		57.06		47.03		38.13		30.10		15.24	b	38.24
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		18.23	a	35.26
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	14.50	a	26.00		19.53	a	34.93		44.61		50.20		57.68		56.10		46.67		33.97		28.97	a	10.29		35.29
1933	24.81		15.54		30.52		32.27		42.39		57.40		61.46	c	56.68		52.14	a	42.63	a	31.70		30.90		39.87
1934	25.74		26.14		30.39		37.40		49.77		54.77		62.19		57.47	a	43.03	a	40.32		31.67		24.23		40.26
1935	24.19		23.07		28.61		32.27		38.97		36.69	a	58.43	a	57.65		48.70		36.58		24.50		20.32		35.83
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	a
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	21.73	a	24.25		29.87		35.37		42.81		52.77		57.55		59.19		52.23		41.23		24.27		21.00	a	38.52
1939	23.81		14.74	a	29.10	b	36.43		45.23		51.93		59.06		55.65		50.63		39.13		30.79	a	28.48		38.75
1940	12.77		23.96	b	31.03		32.93	a	45.65		54.17		58.84		54.68		50.17		40.68		24.22	c	22.32	c	37.62
1941	21.43	c	24.15	a	24.20	a	33.93	a	46.97		50.77		56.68		55.63	a	45.03	a	36.53	a	29.67		22.29		37.27
1942	15.81		13.04		24.07	a	35.53		40.13		50.61	b	58.81		56.97	a	47.29	b	38.90		30.57		25.87		36.46
1943	21.97	b	26.67	a	21.23	a	41.43		40.65		52.87		59.47	a	59.74		47.00		38.97		28.67		23.87		38.54
1944	20.73	a	20.79		21.87		31.43		44.94		51.67		55.74		57.52		48.53		41.16		30.93	a	20.47	a	37.15
1945	23.00		23.50		27.63	a	30.17		43.19		48.30		57.65		58.03		45.80		40.57	a	31.13		20.00		37.41
1946	20.97	b	25.18		32.42		41.73		40.57	a	52.93		58.73	a	57.70	d	49.13		35.80	a	26.37		28.23	a	39.15
1947	21.38	b	19.29		24.97	a	35.70		44.80	a	49.70		61.88	f	62.52		54.93		44.90		23.23		26.03		37.04	a
1948	19.77		19.07	b	23.13		39.70		46.84		54.97		60.74		61.32		56.23		40.84		28.17		22.06		39.40
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		29.63	a	27.34	b	35.40		42.45		54.40		58.06		58.29		49.63		46.52		28.90		28.00		39.86
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		31.80	a	39.76
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		30.07	a	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		42.33	a	50.37		57.84		55.00		47.53		34.48		26.63		23.13		37.20
1977	13.97		26.54		25.19		35.87		44.61		55.63		59.13		55.10		49.53		38.45		29.40		25.60	a	38.25
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	a
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	c
1980	18.06		23.72		26.19		33.87		42.32		53.87		58.35		56.74		49.97		38.00		30.17	a	30.97		38.52
1981	25.68		24.75		29.26		42.10		43.19		53.17		55.67	a	54.90		49.97		38.58		34.59	a	25.55		39.78
1982	18.76	b	21.33	a	30.10		34.60		42.27	a	48.30		57.35		59.00		49.69	a	37.23	a	-----	z	23.83	a	38.41	a
1983	-----	z	25.71	n	26.37	d	31.41	a	40.03		47.90		57.55		59.26		48.07		37.00		26.93		9.65		38.42	b
1984	16.72	b	22.69		26.90		30.63		44.52		50.77		57.90		57.35		45.90		33.55		26.73		20.61		36.19
1985	14.48		15.64		27.48		38.77		44.81		53.37		58.39		55.90		45.47		36.55		20.70		20.23		35.98
1986	28.90		25.61		35.26		37.20		42.61		54.73		56.90		56.45		46.27		36.90		28.50		22.03		39.28
1987	22.87		25.79		26.90		37.37		46.19		53.47		56.84		55.03		46.20		37.61		29.00		19.87		38.10
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	e
1990	-----	z	-----	z	-----	z	35.40		40.35		53.47		55.61		54.74		51.53		39.45		32.53		14.19		41.92	c
1991	17.48		28.71		30.42		35.57		44.81		53.23		56.97		55.97		47.63		37.90		26.30		23.74		38.23
1992	22.89	c	29.00		31.84		40.37		45.10		49.37		53.65		52.61		49.40		39.68		22.70		17.39		37.83
1993	17.65		20.25		30.71		34.93		44.52		49.70		54.61		-----	z	43.87		35.68		23.13		24.13		34.47	a
1994	23.65		19.32		30.13		33.73		44.58		53.13		56.00		56.71		50.17		38.10		25.50		23.81		37.90
1995	22.10		24.89		29.00		33.03		39.35		48.60		54.97		58.13		47.10		36.39		32.03		24.16		37.48
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		26.17		23.35		37.48
1998	24.35		24.82		25.19		33.87		43.35		47.80		58.94		56.45		51.77		37.87		32.77		20.23		38.12
1999	23.94		28.79		31.68		32.23		41.26		49.47		58.71		55.84		43.83		36.03		32.31	a	24.81		38.24
2000	24.97		28.07		29.71		35.00	b	46.07	a	51.69	a	58.90	a	57.84		47.33		36.32		19.27		18.94		37.84
2001	21.68		20.93		29.06		37.37		44.61		53.03		60.10		57.58		49.47		38.87		30.50		22.87		38.84
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		38.53	a	28.77		24.61		38.07
2005	23.68		26.07		30.03		35.07		44.61		50.93		58.48		55.19		50.77		39.26		31.28	a	20.97		38.86
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		46.13		49.57		54.61		54.23		47.93		31.87		30.73		15.48		37.24
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		32.23		21.10		40.09
2013	19.74		19.61		27.00		29.80		43.58		53.47		57.55		56.71		52.53		35.61		29.70		18.71		37.00
2014	20.71		18.93		28.68		35.97		42.90		50.63		57.94		55.13		49.10		40.74		25.23		21.61		37.30
2015	23.06		23.21		31.65		36.57		41.94		53.80		55.74		55.97		51.40		42.94		27.53		21.68		38.79
2016	21.65		27.31		30.00		36.70		40.90		54.50		57.84		54.97		48.63		42.97		32.93		17.65		38.84
2017	20.00		29.43		35.55		34.10		41.42		52.43		58.03		54.16		49.40		36.39		33.50		22.13		38.88
2018	23.45		19.00		28.77		33.53		45.90		53.70		56.77		55.03		50.60		37.23		26.10		20.45		37.55
2019	21.90		18.00		24.13		36.03		38.65		49.63		57.16		57.74		50.70		30.94		25.90		24.10		36.24
2020	23.55		19.34		30.19		32.43		44.23		53.13		57.77		57.13		48.23		34.70	a	30.57		22.90		37.85
2021	22.23		15.54		27.81		32.37		42.13		53.57		57.68		56.16		51.33		37.94		33.43		27.03		38.10
2022	20.42		16.46		26.84		32.77		41.48		52.57		59.00		58.29		50.87		38.61		23.57		17.77		36.55
2023	19.74		19.96		23.90		32.93		44.32		50.40		57.26		56.97		49.63		36.71		30.67		26.58		37.42
2024	17.68		26.69		29.00		36.59	m	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	24.46	i
Period of Record Statistics
MEAN	20.57		22.33		27.96		35.54		44.10		52.62		58.54		57.41		49.15		38.89		28.87		22.23		38.24
S.D.	4.64		4.88		3.94		2.80		2.50		2.96		2.43		2.41		3.04		3.12		3.61		4.29		1.40
SKEW	-0.83		-0.49		0.33		0.13		0.40		-1.05		0.66		0.40		0.27		-0.01		-0.12		-0.66		0.14
MAX	31.71		34.00		43.10		42.10		51.68		59.97		66.03		65.97		57.89		47.42		39.37		31.80		42.31
MIN	3.45		7.61		18.19		28.17		38.65		36.69		53.65		51.74		42.23		30.68		19.27		9.65		35.22
YRS	125		125		127		128		127		127		126		125		125		126		125		125		113