YELLOWTAIL DAM, MT

Average of Minimum Temperature (Degrees Fahrenheit)

(249240)

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
1948	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	39.52	f	57.71		50.10		35.45		27.90		10.90		36.41	g
1949	-2.94		7.25		23.90		42.60		47.06		53.07		58.39		58.87		45.77		34.90		37.87		10.71		34.79
1950	-6.58		22.63	a	20.90	a	32.90	a	39.84		49.30		55.06		54.06		47.33		-----	z	-----	z	-----	z	35.05	c
1951	-----	z	21.00	i	20.17	h	32.13		45.61		46.50		57.45		55.61		44.28	a	37.68		-----	z	-----	z	45.61	e
1952	11.32		20.10		22.10		38.14	a	45.71		54.67		57.32		60.05	i	-----	z	-----	z	-----	z	-----	z	35.62	e
1953	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1954	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1955	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1956	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1957	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1958	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1959	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1960	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1961	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1962	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	20.97		20.97	k
1963	2.68		27.11		30.58		34.93		44.65		51.33		57.23		57.06		52.90	a	41.55		29.67		16.71		37.20
1964	22.87		24.69		21.13		33.14	a	45.26		53.00		61.00		51.87		41.80		37.48		20.17		9.65		35.17
1965	19.84		17.21		12.61		36.40		42.52		49.13		56.97		54.74		38.47		39.47	a	27.80		18.97		34.51
1966	6.60	a	12.29		25.35		32.63		45.19		49.97		59.71		52.97		50.03		37.23	a	22.77		19.77		34.54
1967	20.61		24.61		20.47	a	30.87		40.29		47.63		56.55		55.23		49.20		41.10		27.00		15.73	a	35.77
1968	11.55		25.62		31.29		36.17	a	41.48		51.67		56.23		55.42		47.63		38.00		28.96	f	13.23		37.12	a
1969	-0.52		17.14		22.42		37.77		44.23		49.13		56.58		58.37	a	48.53		31.90		27.38	a	20.77		34.48
1970	11.71		22.11		20.68		32.03		47.10		53.67		59.06		58.61		46.20		35.87	a	25.67		19.16		35.99
1971	14.19		20.57		27.16		35.67		45.00		52.10		54.42		61.52		44.63		38.84		30.73		15.90		36.73
1972	9.48		22.03		32.13	a	34.73		46.42		55.60		54.52		58.10		45.63		34.97		29.80		15.10		36.54
1973	18.58		22.07		29.55		34.47		43.87		53.83		58.71		60.23		49.07		42.39		25.87		27.13		38.81
1974	19.10		31.18		29.32		39.90		43.29		53.73		61.29		52.90		44.90	a	39.94		31.57		26.58		39.47
1975	18.97		9.64		23.26		29.50		41.84		50.93		60.42		54.35		46.93		40.06		26.77		24.68		35.61
1976	17.54	g	26.19	b	26.03		37.33		45.35		52.07		59.77		57.39		50.17		38.06		30.20		28.53	a	41.01	a
1977	13.06		32.71		29.23		38.40		46.16		57.20		59.45		54.81		47.73		40.00	a	25.50		17.68		38.49
1978	6.61		11.81	a	28.61		39.37		44.87		51.43		56.97		55.35		50.63		40.79	b	18.73	d	16.52		35.14
1979	3.50	c	12.32		29.28	b	34.17		44.45		52.80		58.68		60.00		51.87		43.71		28.30		27.87		37.25
1980	11.58		23.66		25.16		40.73		47.84		52.53		59.77		55.10		50.47		40.07	b	34.37		24.84		38.84
1981	27.13		25.89		30.39	c	42.10		46.97	a	51.60		57.65		57.71		50.62	a	39.48		34.73		25.06		40.78
1982	9.06		23.75		27.68		36.07		43.29		50.10		57.97	a	58.67	a	47.43		41.03		25.73		24.50	a	37.11
1983	26.52		29.93		32.16		33.90		43.13		52.20		58.74		64.45		48.77		41.81		31.60		2.10		38.77
1984	27.77	a	29.79		30.61	c	35.59	a	45.00		53.40		60.45		62.19		44.93		35.71		31.62	a	9.78	d	38.90
1985	13.77	a	16.81	a	25.45		42.33		47.19		51.50		61.58		54.94		45.40		39.87	a	12.28	a	23.90		36.25
1986	31.17	a	16.96		37.97		37.73		43.23		56.31	a	56.39		56.48		46.93		42.00		26.36	b	24.32		39.65
1987	24.65		28.07		31.68		39.10		48.03		54.03		55.38	b	52.17	a	45.40		36.55		30.90		22.21	b	39.01
1988	18.59	b	21.07		32.00		38.93		46.13		58.27		58.42		52.80	a	47.03		40.87		31.45	a	24.47	a	39.17
1989	22.47	a	9.12	c	21.23		37.30		44.45		50.80		60.84		55.68		47.30		39.61		32.60		20.52		36.83
1990	27.82	c	23.44	a	29.23		36.90	a	43.03		51.27		56.77		57.32		53.67		39.94		34.87		13.46	c	38.98
1991	15.77	a	31.82		27.58		37.20		46.16		53.80		59.42		59.84		50.13		37.80	a	28.57		28.21	b	39.69
1992	30.17	b	32.24		34.55		40.73		46.42		53.77		55.45		52.55		47.60		39.57	a	31.89	b	16.23	a	40.10
1993	12.93	d	14.25		33.87	a	38.47		47.06		53.27		53.29		53.81		47.00		38.61		27.71	b	29.23		37.46
1994	22.48	b	17.88	c	34.54	c	37.23		48.35		55.17		58.10		58.71		48.90		39.13		27.70		25.06		39.44
1995	23.35		25.50		26.06		32.70		40.48		52.48	a	55.87		56.97		48.83		40.93	a	30.16	e	21.03	a	37.87
1996	9.87		21.29	a	20.97		39.28	a	42.68		55.31	a	57.74		57.16		47.20		37.90		20.38	a	14.41	d	35.35
1997	14.45	b	27.32		31.75	c	32.33		46.10	a	56.40		56.74		56.77		50.40		41.00	b	28.38	a	22.78	d	38.70
1998	21.50	a	27.11		22.81		36.63		45.32		49.67		61.06		57.77		53.79	a	36.61		33.31	a	21.14	c	38.89
1999	23.18	c	32.00		29.45		36.27	d	44.83	a	51.73		57.77		59.40	a	45.60		39.60	a	36.24	a	31.70	d	40.65
2000	21.47	a	24.10		30.90	a	35.97		46.97		51.77		59.16		58.06		48.76	a	36.53	a	19.70		13.87	a	37.27
2001	23.28	b	12.78	a	28.73	a	37.62	a	45.56	f	54.70	c	63.76	b	62.43	a	50.44	c	40.14	b	31.42	d	25.22	h	40.53	b
2002	23.32	f	27.88	d	19.07	b	33.04	b	43.07	c	55.20	e	64.30	a	57.75	c	50.45	h	32.89	d	34.66	a	26.45	b	39.43	b
2003	23.38	e	20.96	e	23.93	a	40.33		44.68		52.53		63.26		63.81		49.20		43.23		24.37		24.94		39.55
2004	15.67	a	23.62		33.23	a	38.77		43.87		51.00		59.58		56.68		49.80		39.58		29.96	b	27.20	a	39.08
2005	14.07	a	25.04	c	30.81		36.14	b	43.97	a	53.13		60.57	a	57.13	a	50.63		39.68		32.77		19.19		38.59
2006	32.10		22.48	a	25.23		37.89	b	44.55	b	54.93	a	64.17	a	57.71		48.23		35.63	a	26.66	a	22.80	a	39.36
2007	18.58		18.07	a	33.23	a	36.79	b	46.86	b	54.87		64.13	a	57.69	e	48.61	b	40.71		28.30		22.26		39.18
2008	14.79	b	21.75	a	27.13		32.00		44.29		48.33		58.53	a	52.13	a	35.59	a	35.00	c	31.28	a	12.39		34.43
2009	21.67	a	22.30	a	21.17	a	35.40		43.00		49.70		56.81		56.13	a	45.43	b	33.39	c	28.79	a	11.32	c	35.43
2010	15.23		16.41	a	30.32	c	36.18	b	40.68	c	52.07		56.83	a	57.75	c	47.00	b	41.80	a	24.75	b	17.87	a	36.41
2011	20.19	e	15.62	d	24.94		34.04	c	42.90	a	51.18	b	61.13	a	59.93	a	49.21	b	43.69	e	28.83		23.13		37.90
2012	21.16		21.03		35.04	c	37.93	c	42.62	e	54.56	c	64.19		59.06		51.03		40.23		28.36	b	20.48	d	39.64
2013	21.06		24.93		24.07	a	31.20		45.58		52.79	a	60.59	b	60.32		51.36	e	35.52		25.10		14.00	g	39.32	a
2014	22.48		11.46		25.03	b	36.27		45.55		51.17		58.74		59.29		47.87		42.17	a	21.90		20.74		36.89
2015	23.52		20.68		35.53	a	35.00	d	43.76	f	57.60		58.50	e	56.42		49.33		41.93	c	26.87		23.07	b	38.95	a
2016	23.43	a	30.86		32.63	a	38.43		44.35	e	55.10		58.94		56.55		52.47		41.61		34.57		16.53	a	40.46
2017	9.08	e	31.92	p	32.74		37.27		45.77		54.97		63.84		55.35		50.03		37.63	a	30.53		24.88	e	40.19	a
2018	-----	z	-----	z	30.00	b	32.13		50.29		53.93		58.97		56.42		47.17		36.32		27.63		22.39		41.53	b
2019	21.07	a	-0.50		16.97		38.69	a	40.96	f	52.30		59.06		58.29		51.30		33.42		30.48	a	28.84		35.45	a
2020	27.19		29.07		29.90	b	32.24	a	42.73	e	53.92	d	58.35		58.87		48.77		31.03	a	23.55	a	27.04	d	38.56
2021	24.27	a	9.46		30.79	b	36.60		42.04	f	55.86	b	60.54	e	58.80	f	49.07		41.90	b	32.31	a	16.58		35.74	b
2022	21.83	b	17.29		23.17	a	21.91	s	47.75	w	52.71	i	59.94		60.77		52.56	c	31.00	s	11.50	h	4.08	g	39.26	f
2023	16.70	k	19.11		17.58	e	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	18.34	j
2024	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
Period of Record Statistics
MEAN	17.51		21.32		27.39		36.26		44.71		52.76		58.89		57.21		48.18		38.73		28.46		20.39		37.71
S.D.	8.31		6.98		5.19		2.97		2.11		2.42		2.55		2.79		3.18		2.95		4.64		6.01		1.85
SKEW	-0.75		-0.62		-0.43		-0.06		-0.12		-0.13		0.35		0.22		-1.32		-0.60		-0.80		-0.55		-0.31
MAX	32.10		32.71		37.97		42.60		50.29		58.27		64.30		64.45		53.79		43.71		37.87		31.70		40.78
MIN	-6.58		-0.50		12.61		29.50		39.84		46.50		53.29		51.87		35.59		31.03		12.28		2.10		34.43
YRS	60		62		64		63		59		63		64		63		63		62		60		60		50