WEST YELLOWSTONE, MT

Average of Minimum Temperature (Degrees Fahrenheit)

(248857)

File last updated on May 12, 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
1924	-4.60	a	1.31		-0.39		17.50		23.26		27.93		34.39		30.97		27.42	d	23.07	c	2.78	c	-11.39	c	14.35
1925	3.82	c	11.04	d	7.88	f	21.68	b	27.84	f	38.36	p	39.19		34.77		31.28	a	20.52		9.57	b	10.90	b	20.31	c
1926	-2.76	f	11.25	d	3.76	b	20.08	f	33.74		34.71	b	39.65		37.55		22.04	b	23.87		20.03		0.17	g	25.18	c
1927	0.42	e	-1.11	i	0.88	f	15.78	l	29.18	c	37.10		37.58		33.03	a	30.38	a	21.13	a	21.47		-5.60	a	22.74	c
1928	7.83	g	-10.65	l	6.17	a	11.50	d	29.77	a	32.97	a	38.34	b	28.45		24.14	b	22.21	b	9.79	a	-6.65		19.67	b
1929	-12.68	i	-9.71	d	6.19	d	16.78	c	20.48	d	31.24	a	35.20	a	37.87		22.91	g	17.50	c	-2.17		6.21	b	15.96	b
1930	-20.97	a	6.52	g	5.58	g	22.27	d	-----	z	29.40		35.97		39.39		27.83		22.42		-2.50		-7.50	e	16.26	c
1931	-0.82	c	-2.72	c	-1.48	j	17.90		22.94	o	34.53	o	35.48	b	33.48		25.81	n	18.86	b	1.60		-1.42		12.80	d
1932	-10.74		-0.79		3.80	a	17.43		28.55		34.78	c	38.19	e	33.26		25.20		16.03	b	13.50		-9.77		15.79
1933	8.81		-8.64		2.77	a	15.70		25.35		34.00	b	38.38	b	35.43	a	28.00		23.43	c	11.71	b	14.52		19.12
1934	8.23		7.29		16.77		22.33		27.65		33.07		37.26		34.00		24.80		25.90		16.63		4.23	a	21.51
1935	3.35		-0.71		9.65		15.67		23.94		31.07		34.29		31.29		26.53		19.35		9.33		2.69	e	17.20
1936	-1.55		-0.97		1.17	h	18.10		27.27	a	37.53		43.65		38.74		26.00	a	19.52		-5.89	b	0.50	c	18.45	a
1937	-20.58	g	0.30	h	5.64	f	18.95	j	26.43	c	33.83	a	39.55		33.77	a	28.83	a	21.39	c	15.35	d	2.96	d	25.26	d
1938	-2.12	g	5.50	f	12.32	f	16.68	b	28.13		34.13		38.87		34.26		29.37		25.94		0.87		4.81		23.67	c
1939	2.87		-5.86		11.81		20.47		27.93	a	31.13		38.42		32.94		30.07		23.10	a	6.73		10.52		19.18
1940	2.84		7.00		10.81		21.33		26.81		32.27		37.87	a	33.58		33.07		23.06		4.27		4.23		19.76
1941	1.67	a	3.61		11.26		18.90		28.89	d	35.23		40.03		40.74		28.67		20.97		11.07		6.16		20.60
1942	-4.39		-7.00		2.19		21.83		26.68		31.57		36.84		35.32		28.20		21.84		9.67		7.06		17.48
1943	-4.84		-1.93		-2.03		24.33		26.29		32.86	a	35.55		33.45		26.30		23.03		13.28	e	-1.13		17.10
1944	-7.48		3.86	a	0.68		19.63		28.23		34.73		35.71		30.90		28.20		21.58		10.77		-1.67	a	17.09
1945	4.39		4.89		11.68		14.13		29.42		33.23		35.58		36.19		28.53		21.32		13.93		0.16		19.46
1946	-3.06		1.50		11.97		21.47		26.13		32.53		37.74		33.94		25.77		21.81		11.07	b	7.87		19.06
1947	-4.61		1.68		7.93	c	16.39	l	-----	z	33.00	l	36.10		34.94		31.17		26.97		7.90		3.48		16.17	c
1948	-5.97		0.34		-----	z	23.10	j	29.53	a	39.41	a	39.20	a	37.32		30.20		20.84		8.73		-0.39		19.92	b
1949	-15.71		2.00	a	13.60	a	21.20		31.65		36.30		38.90		38.39		29.60		21.68		19.18	b	3.42	g	21.53	a
1950	0.48	b	7.11		10.06		17.87		24.35		33.14	a	37.94		35.06		29.97		26.16		16.33		11.52		20.83
1951	-2.87		6.79		4.52		18.23		29.83	a	31.00		37.81		37.97		27.00		22.35		6.55	a	0.35		18.29
1952	2.32		-4.62		4.03		19.50		29.74		35.87		37.74		37.90		28.53		18.87		-2.13		6.29	c	17.84
1953	17.16		0.81	a	9.10	a	14.43		25.03		33.63		40.90		38.45		31.14	a	22.20	a	17.77		1.42		21.00
1954	8.97		9.11		3.21	c	22.90		28.71		34.33		42.84		36.61		28.47		16.84		16.17		-4.42		20.31
1955	-3.61		-6.26	a	-1.81		17.60		27.71		34.07		41.58		39.90		30.40		21.69	b	6.28	a	6.93	c	17.87
1956	7.13		-7.59		5.03		20.37		33.35		35.73		39.90		34.61		29.23		23.23		-0.37		3.68		18.69
1957	-15.43	a	8.39		8.29		20.17		32.13		36.93		40.32		38.19		28.43		24.16		3.73		6.35		19.31
1958	-1.16		11.79		7.61		20.17		31.65		37.30		37.32		40.16		28.87		19.13		10.10		7.03		20.83
1959	-0.03		3.43		6.26		19.50		26.65		37.83		38.52		37.39		32.40		23.32		4.83		-3.97		18.84
1960	-2.73	a	-5.10		10.29		21.20		27.74		35.83		41.48		36.58		29.90		22.00		9.97		-5.65		18.46
1961	-10.35		9.46		11.52		19.17		28.87		37.53		40.29		42.55		29.17		21.13		4.03	a	-2.29		19.26
1962	-10.42		4.93		7.65		17.70		31.03		36.80		38.94		37.23		29.20		25.61		14.97		5.61		19.94
1963	-12.00	a	10.29		7.58		20.03		31.68		36.13		39.65		39.00		37.37		26.81		17.97		-1.35		21.10
1964	-3.48		-10.14		1.58		18.47		29.48		37.47		41.06		35.71		26.70		20.06		12.00		2.97		17.66
1965	4.10		-2.57		-6.52		22.97		26.30	a	34.60		39.97		37.52		25.47		22.10		18.24	a	3.58		18.81
1966	-0.52		-1.89		5.00		19.00		28.61		34.87		41.32		37.10		33.50		19.93	a	15.93		1.81		19.56
1967	8.42		2.75		13.10		19.17		26.81		36.87		42.90		39.48		33.90		24.81		12.76	a	-6.00		21.25
1968	-2.26		9.00		14.74		17.57		28.77		37.30		42.35		39.35		31.70		24.03		10.80		-0.45		21.08
1969	7.45		5.46		2.45		23.73		30.65		34.40		40.45		39.20	a	31.33		18.77		8.73		1.94		20.38
1970	4.32		4.89		6.45		13.07		28.52		37.73		42.97		41.03		28.60		17.81		13.53		4.23		20.26
1971	4.71		1.96		6.10		19.07		28.26		37.87		39.39		42.52		27.27		21.81		11.50		2.58		20.25
1972	2.84		6.38		16.00		21.13		28.87		38.27		38.81		39.84		29.50		23.48		13.40		-3.61		21.24
1973	-5.90		1.68		8.52		17.52	c	26.23		35.50		41.45		41.16		32.47		25.03		19.10		8.06		20.90
1974	5.23		7.11	s	15.39	c	21.48	a	28.06		37.45	a	42.68		37.58		28.77		24.63	a	15.31	a	-1.84		23.16	a
1975	0.19		1.00		12.42		15.13		26.81		34.72	a	44.55		36.93	a	27.30		25.16		9.10		8.47	a	20.15
1976	5.74		6.17		3.47	a	22.07		29.90		34.14	a	42.00		39.06		33.13		20.94		12.14	p	-3.84		21.16	a
1977	-5.52		1.07		6.59	b	20.66	a	30.40	a	41.40		43.00		40.52		31.80		22.93	c	14.50		10.61		21.50
1978	9.23		9.43		15.03		24.57		30.10		35.03		41.10		36.13		31.27		20.66	b	11.31	n	-13.15	k	25.25	b
1979	-7.90	j	4.90	g	-----	z	23.00	x	28.35		34.20		41.23		41.19		29.80		23.90		0.14	a	7.34	b	25.77	d
1980	-1.24	b	-----	z	14.48	j	16.17	x	31.27	a	36.10		42.29		36.52		33.17		20.83	a	14.32	b	11.10		24.93	c
1981	5.29		6.42	b	11.83	b	23.63		31.83	b	38.60		39.03		35.39		30.83		23.32		14.47		7.97		22.38
1982	1.29		0.11		13.97		10.79	a	25.83	a	34.47		41.03		38.42		32.38	a	22.48		3.70		0.61		18.76
1983	7.32		10.07		17.97		18.13		27.45		35.93	a	40.06		44.13		30.28	a	26.00	a	16.10		-3.71		22.48
1984	1.71		-0.24		14.29		16.97		29.11	d	35.33		41.94		40.71		27.67		17.83	a	10.27		-4.45		19.26
1985	-9.74		-7.39		1.90		22.03		30.03		35.53		42.06		34.84		29.00		20.94		1.47	m	-0.19		18.09	a
1986	6.90		11.00		19.81		22.30		28.26		39.10		40.26		40.06		-----	z	21.26		11.38	a	-4.55		21.43	a
1987	-2.29		5.25		14.74		21.97		34.48		38.21	f	42.26		37.29		29.77		18.00		12.83		1.93	a	19.66	a
1988	-2.97		2.62		6.32		23.84	e	29.58		39.97		41.16		37.32		31.38	a	26.52		15.97		1.10		21.07
1989	0.80	a	-3.14		17.29		19.00	i	29.97		36.20		43.58		40.83	b	27.67		26.92	g	17.64	e	-0.04	d	21.08	b
1990	6.43	a	2.79		12.10		25.57		29.58		36.80		41.77		40.00		33.77		22.57	a	13.21	a	-9.04	e	21.29
1991	-2.79	c	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	41.00		32.47		18.17	g	6.45	a	-1.13		15.20	g
1992	-1.00		9.93		17.74		25.40		32.35		37.97		38.52		34.95	k	30.20		23.48		8.23		-0.93	c	20.17	a
1993	-4.47	l	-4.54	o	14.61		23.67		30.90		36.48	a	36.03		36.13		28.20		22.03	a	2.38	a	0.61	h	25.60	c
1994	7.73	a	3.11	a	11.03		21.83		33.87		36.81	n	39.48		38.29		31.37		23.90		2.45	a	6.87	a	19.99	a
1995	3.19		10.11		13.00		21.47		29.00		35.86	a	41.58		38.39	h	-----	z	19.87		18.57		1.37	a	19.40	b
1996	-4.89	c	-3.48		8.29		-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-0.03	i
1997	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1998	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1999	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2000	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	43.89	v	39.30	u	30.25	r	29.57	x	1.73	s	-----	z	-----	z
2001	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	15.71	w	4.08	s	-----	z
2002	1.94	o	-0.65	k	4.21	l	23.92	q	29.50	g	38.19	i	42.96	g	34.65	k	31.80	e	17.31	e	10.00	q	6.88	o	24.55	j
2003	15.39	m	-2.71	d	17.56	f	25.44	e	28.00	k	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	11.37	j
2004	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2005	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2006	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2007	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2008	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2009	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2010	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2011	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2012	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
2013	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
Period of Record Statistics
MEAN	-0.31		2.28		8.66		19.75		28.71		35.26		39.57		37.15		29.48		22.02		10.26		1.69		19.52
S.D.	6.86		5.83		5.62		3.27		2.57		2.52		2.44		3.09		2.63		2.53		6.25		5.62		1.72
SKEW	-0.49		-0.26		-0.26		-0.50		-0.29		-0.35		-0.24		-0.32		-0.01		-0.16		-0.51		-0.07		-0.71
MAX	17.16		11.79		19.81		25.57		34.48		41.40		44.55		44.13		37.37		26.97		21.47		14.52		22.48
MIN	-20.97		-10.14		-6.52		10.79		20.48		27.93		34.29		28.45		22.04		16.03		-5.89		-11.39		14.35
YRS	66		64		62		64		67		66		71		70		69		71		69		68		45