MOUNT RUSHMORE NATIONAL MEMORIAL, SD

Average of Minimum Temperature (Degrees Fahrenheit)

(395870)

File last updated on December 5, 2025
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
1962	-----	z	15.21		21.27	a	34.67		44.87		50.43		56.16		56.32		45.83		40.48		29.48	a	21.32		37.82	a
1963	3.58		20.89	a	27.83	a	32.80		41.55		50.77		60.45		59.35		54.30		48.68		30.23		15.74		37.18
1964	20.35		17.69		18.06		32.43		44.68		51.63		63.10		54.87		46.30		41.84		26.13		16.45		36.13
1965	22.29		16.46		9.71		34.37		40.48		50.27		57.94		56.06		36.83		43.77		32.00	a	26.84		35.59
1966	9.71		16.96		26.84		27.60		43.26		52.57		62.55		54.68		50.70		37.81		26.03		20.16		35.74
1967	20.19		18.36		24.32		31.80		37.68		48.50		58.97	a	57.77		50.53		39.29		26.77		15.13		35.78
1968	17.74		19.59		28.81		29.23		38.32		50.50		57.00		53.16		47.87		40.16		26.29	b	12.10		35.06
1969	8.43	a	19.86		19.00		37.53		45.52		47.00		58.00		62.29		53.40		30.71		29.57		23.03		36.19
1970	13.32		21.46		18.90	a	28.47		43.00		54.73		58.94		59.55		46.20		34.23	a	25.57		18.23	a	35.22
1971	12.68		17.04		20.87		32.13		40.52		53.53		55.48		61.26		45.48	e	32.38	b	21.04	b	16.84		34.10
1972	4.35		19.90		27.45		32.63		43.10	a	53.13		54.87		57.84		46.20		35.23		24.57		12.26		34.29
1973	18.68		22.36		27.42	e	30.23		41.16		52.83		58.68		58.77		47.59	a	39.10		24.77		18.84		36.70
1974	15.55		23.86		24.48		34.33		40.65		53.80		61.06		54.97	a	44.77		42.03		27.70		22.35		37.13
1975	17.10		13.25		19.13		29.00		-----	z	50.30		62.06		57.65		47.40		40.42		26.27		23.03		35.05	a
1976	17.29		25.45		22.23	a	34.33		42.88	g	49.73		59.71		57.06		50.20		33.65		22.00		21.42		35.73	a
1977	8.13		23.32		21.42		37.43		45.19		54.41	a	58.10	b	52.74		48.87		38.45		23.53		14.84		35.54
1978	7.41	b	11.00		25.39		31.00		41.03		50.67		57.17	b	56.29		51.63		36.42		19.70		9.61		33.11
1979	3.32		12.46		24.00		27.70		37.97		47.50		55.81		56.16		54.93		38.74		24.13		25.84		34.05
1980	11.30	a	18.21		21.17	a	33.17		40.55		53.23		60.32		54.21	c	48.33		38.55		29.55	a	23.77	a	36.03
1981	25.52		19.54		28.16		37.93		40.20	a	50.17		58.39		58.16		51.00		36.48		33.86	a	19.29		38.22
1982	6.63	a	17.54		22.58		28.41	a	40.19		47.13		58.90		57.74		47.20		36.03		23.37		20.17	a	33.83
1983	23.68		26.64		25.48		27.53		38.65		50.57		62.00		64.10		47.48	a	37.81		27.60		5.13		36.39
1984	20.84		24.79		23.29		30.43		38.39		47.25	b	58.35		62.23		41.87		36.77		29.67		15.45		35.78
1985	14.30	a	14.14		26.23	a	38.14	a	49.16		49.43		61.43	a	54.87		44.77		35.13		11.27		14.55		34.45
1986	27.47	a	17.04		31.97		32.83	a	41.07	a	55.97		58.87	a	56.81		43.67		39.00		24.07	a	24.32		37.76
1987	22.73	a	25.57		23.65		39.23		47.32		55.40		60.68		54.48		49.07		36.06		32.32	b	20.87		38.95
1988	16.27	a	16.52		25.00	k	33.83		45.84		61.47		60.87		59.84		47.83		38.35		27.57		20.27	a	38.97	a
1989	20.39		5.74	a	21.68		32.73		41.79	b	51.17	a	62.73	a	57.52		47.87		37.81		26.10	a	14.47	a	35.00
1990	26.14	i	19.92	b	25.97		31.70		39.74		53.47		58.06		59.23		55.33		36.39		31.90		11.39		38.46	a
1991	14.03		28.32		27.10		34.57		43.94		54.28	a	57.87		61.88	e	50.40		35.94		21.97	a	26.48		38.06
1992	25.45		28.03		29.87		34.97		44.65		48.50		49.39		51.06		48.57		38.23		23.48	a	12.58		36.23
1993	15.48		12.57		27.00	a	30.73		42.52		47.23		52.13		53.74		42.27		35.19		20.30		22.97		33.51
1994	15.52		11.57		26.39		32.10	a	46.48		53.76	a	55.90		57.19		52.00		38.19		26.20		25.10		36.70
1995	22.65		20.44	a	23.97		26.38	a	37.19		49.93		57.67	a	60.93	a	47.67		35.23	a	25.70		20.61		35.70
1996	10.48		18.14		16.74		31.37		37.61		54.31	a	57.94		57.84	f	46.63		35.87		18.00		13.94		31.00	a
1997	13.65		20.07		25.61		26.30		38.07	b	54.40		56.66	b	56.81		51.00		38.50	a	25.83		23.60	a	35.87
1998	19.29		26.19	b	19.63	a	34.00		43.29		45.38	a	60.48		58.60	a	55.60		39.06		29.03		17.90		37.37
1999	18.42		25.57		26.45		30.67		42.00	a	49.47		58.94		58.58		44.10	a	39.00		37.60		25.35		38.01
2000	21.00		25.86		27.73	a	30.83		43.87		49.55	a	60.16		61.30	a	50.53		40.57	a	18.79	a	11.87		36.84
2001	22.93	a	11.74	a	25.45		35.67		43.57	a	51.83		61.63	a	63.16		51.53		36.81		33.69	a	21.26		38.27
2002	18.87		22.81	a	13.13		29.17		37.70	a	55.97		63.39		56.23		49.60		28.57	a	29.63		24.40	a	35.79
2003	19.16		13.62	b	21.53	a	36.55	a	41.29		49.00		62.14	b	61.53	a	45.63		42.40	a	22.47		24.77		36.67
2004	18.83	a	22.48		28.40	a	34.53		41.13		48.07		57.47	a	54.17	a	49.07		36.93	a	26.79	a	23.70	a	36.80
2005	18.57	a	24.74	a	26.31	b	33.00		38.81		53.70		60.71		56.90	a	52.33		40.26		30.10		17.13		37.71
2006	28.81		17.32		23.65		37.27		44.71		55.23		64.00	d	55.84		45.43		34.00		26.93	a	22.71		37.99
2007	16.10		13.00		31.16		29.17	a	45.84		54.40		62.73	a	59.52		50.70		39.48		26.90	a	17.94		37.24
2008	15.32		17.76		23.16		29.41	c	39.88	e	49.30		58.20	a	55.42		46.27		35.83	a	29.80		9.94		34.19
2009	17.26		20.82		24.65		30.83		41.87		49.27		55.58		54.77		51.73		27.94		32.93	a	10.21	c	34.82
2010	21.23		15.68		29.77		34.20		36.71		49.90		58.26		60.81		47.90		42.87		24.67		20.39		36.86
2011	15.19		12.04		24.32		30.93		39.03		51.23		62.68		60.29		50.37		40.55		26.23		20.68		36.13
2012	18.97		17.79		36.35		37.20		42.03		55.70		63.35		59.16		52.63		34.81		31.07		21.29		39.20
2013	18.65		21.50		22.45		25.27		43.48		51.17		58.81		60.55		52.90	a	34.00	c	27.30		12.61		35.72
2014	15.90		8.32		22.52		32.27		42.29		49.63		58.23		58.00		50.03		40.81		20.67		23.03		35.14
2015	20.71		18.25		31.29		34.50		39.35		54.27		59.10		58.35		54.53		42.68		27.13		22.45		38.55
2016	24.16		26.28		29.97		35.20		42.81		57.73		59.83	a	57.35		49.60		43.13		36.73		12.55		39.61
2017	16.90		24.00		29.23		33.40		42.55		53.30		61.45		57.48		49.77		36.16		29.93		16.29		37.54
2018	20.90		6.61		24.65		27.50		46.87		53.97	a	59.32		58.13		49.67		34.68		25.03		22.39		35.81
2019	21.52		3.79		19.90		31.47		36.81		50.77		58.16		54.81		50.90		27.68		24.90	a	25.07	a	33.81
2020	20.53	a	17.59		25.52		28.13		40.53	a	56.00		59.92	e	60.42		49.97		31.35		32.69	a	24.77	a	37.29
2021	23.13	a	7.39		27.61		30.23		39.81		56.90		62.48		58.84		52.88	e	39.87		29.87		20.03		37.42
2022	19.16		12.48	a	22.72	b	25.83		40.35		51.23		59.97		60.80	a	54.57	b	40.03	b	20.33		14.39		35.16
2023	20.94		19.57		16.55		25.93		42.86	b	51.97		57.39		58.71		52.30		35.81		29.43		27.33	a	36.57
2024	16.45		25.14		24.13		33.48	a	39.77		52.00	a	59.35		58.68		55.80		43.16		27.97		26.13		38.51
2025	13.58		9.57		29.23		32.17		43.29		52.07		58.13		58.23		53.10		39.45		31.40		-----	z	38.20	a
Period of Record Statistics
MEAN	17.24		18.25		24.47		32.01		41.69		51.86		59.16		57.84		49.24		37.61		26.79		19.14		36.30
S.D.	5.64		5.82		4.56		3.37		2.84		3.02		2.69		2.72		3.67		3.85		4.61		5.19		1.53
SKEW	-0.60		-0.39		-0.51		-0.00		0.31		0.39		-0.78		-0.03		-0.55		-0.27		-0.40		-0.48		0.00
MAX	28.81		28.32		36.35		39.23		49.16		61.47		64.00		64.10		55.80		48.68		37.60		27.33		39.61
MIN	3.32		3.79		9.71		25.27		36.71		45.38		49.39		51.06		36.83		27.68		11.27		5.13		33.11
YRS	62		64		63		64		62		64		64		63		64		64		64		63		57