ARROWROCK DAM, ID

Average of Minimum Temperature (Degrees Fahrenheit)

(100448)

File last updated on April 18, 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
1911	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	26.39	l	19.45		19.45	k
1912	18.52		24.86		28.53	a	35.67		41.39		50.17		49.19		47.84		38.90		34.42		29.80		19.26		34.88
1913	14.86	b	14.04		26.52		34.87		43.94		49.53		52.68		54.39		43.87		34.32		32.90		18.55		35.04
1914	26.71		25.14		31.39		37.97		43.39		46.80		56.32		53.87		44.70		40.74		28.20		12.71		37.33
1915	14.68		30.11		32.45		39.40		40.61		43.63		52.03	b	51.58		-----	z	-----	z	28.57		22.21	b	35.53	b
1916	15.65		25.97		31.55		37.93		38.29		46.15	c	54.23	a	53.87		46.34	a	35.32	c	24.18	b	16.46	c	35.50
1917	16.83	y	14.43		16.68		32.57		41.10	b	45.53		58.31	e	55.78	m	49.63	c	38.50	g	32.25	n	31.10		36.17	d
1918	25.62	b	21.81	b	32.83	a	34.50	b	40.43	c	57.62	d	60.52	j	53.03	b	51.04	d	40.33	a	29.00	f	20.28	b	37.75	b
1919	19.47	a	25.00		28.03	a	37.07	c	43.50	c	48.54	d	58.46	c	57.68		47.44	e	32.63	d	26.76	a	10.96	d	36.30
1920	17.13		23.61	a	28.56	f	33.37	c	40.57	c	50.00	b	60.63	d	57.03	a	47.90		37.53	a	31.00	a	24.23	a	38.46	a
1921	22.00		22.67	a	31.93	c	34.28	e	44.26		52.28	a	57.57	a	58.41	b	42.68	e	38.40	f	31.45	a	24.00		38.32	a
1922	11.17	a	18.07		23.37	a	31.72	a	41.83	b	53.47		57.96	e	60.19		48.28	a	40.29		26.25	b	20.33	d	36.08
1923	19.87	a	11.46		24.70	a	36.83	a	43.42		48.33		59.06		57.15	d	49.86	b	39.20	a	29.66	a	21.30	a	36.74
1924	10.77		29.96	a	27.37	d	35.04	d	46.35		49.72	a	57.30	d	52.59	b	46.25	b	38.93	d	29.07	c	10.26	d	36.13
1925	19.19		27.12	c	31.03	b	39.07		46.14	b	50.57	b	61.04	c	55.34	b	47.11	b	36.34	b	28.21	b	27.60	a	39.06
1926	19.81		29.04		30.55	b	40.23		43.30	a	53.03	a	59.14	b	56.19		39.15	d	36.63	d	37.33		21.52		38.83
1927	20.61		24.73	b	29.47	a	36.03	a	42.23		50.67	c	57.93	a	56.23		45.87		39.41	d	34.88	d	15.96	c	37.83
1928	18.19		19.86	a	30.20	a	34.90		48.13		47.93	b	58.55		54.48	b	46.70	c	36.84	f	30.83	f	13.73	e	37.27	b
1929	7.33	a	11.04	c	29.30	a	34.27		41.71		48.76	a	56.93	d	58.43	c	42.44	c	36.82	i	21.96	c	26.08	e	34.39	a
1930	4.19		29.96		31.07	a	39.19	c	41.70	a	47.14	b	59.39	c	57.79	b	46.38	f	35.75	c	20.08	d	9.17	b	34.13	a
1931	14.93	a	20.00	a	28.85	e	34.85	c	43.19		51.61	b	58.94		55.77	a	46.64	b	37.10	a	20.84	e	12.89	c	35.47
1932	11.30	a	14.86		27.84		37.76	a	44.47	a	50.21	a	55.37	a	52.59	b	44.38	a	35.52		30.64	b	12.03	a	34.75
1933	12.48		4.67	a	24.29		33.20		38.17	a	51.73		57.03		55.27	a	42.85	c	37.48	d	28.41	a	27.67	a	34.44
1934	29.00		31.04	a	35.20	a	40.70		46.77		48.67		58.43	a	56.75	c	43.64	b	37.64	c	33.37	c	18.80	a	40.00
1935	16.48		20.32		25.55		36.33		40.43	a	48.61	b	55.84		53.97		47.93	b	35.07	c	23.43	b	19.29		35.27
1936	16.03		13.89	a	23.23	a	35.63		45.58		52.36	b	60.07	b	57.48		43.72	a	36.03		21.14	a	21.79	b	35.58
1937	0.43	a	13.59	a	28.29		34.31	a	43.47	a	48.59	a	58.21	c	53.10	a	47.90	a	35.96	c	32.60		24.52		35.08
1938	20.27	a	27.26	a	28.53	a	36.70		41.67	a	49.97	a	56.29	c	52.55		50.03	a	38.77	a	23.17		22.48		37.31
1939	17.90		11.44	a	24.20	a	35.57		44.19		45.07	b	56.63	a	56.58		45.67		35.97		25.50		27.71		35.54
1940	24.00		25.32	g	30.58		36.33		44.06		50.33		56.48		55.17	a	48.77		38.84		24.67		23.65		39.35	a
1941	21.19		25.43		28.97		34.73		43.42		48.07		57.48		56.55		43.90		36.68		30.17		26.13		37.73
1942	12.26		18.68		25.19		35.37		39.65		45.77		56.48		54.55		45.83		35.48		28.60		21.97		34.99
1943	16.35		19.18		23.16		38.13		39.94		46.07		54.71		52.52		47.87		39.29		28.50		24.35		35.84
1944	14.58		23.07		24.13		33.90		42.16		46.83		53.03		52.32		46.13		38.35		30.93		22.26		35.64
1945	23.65		26.07		27.00		32.63		43.29		46.70		55.58		53.68		42.87		37.39		28.90		18.87		36.39
1946	13.13		15.89		29.03		37.07		42.81		48.57		57.26		55.26		44.50		34.03		29.77		28.61		36.33
1947	12.16		25.11		31.90		37.03		46.68		48.63		55.48		54.35		46.63		40.74		26.67		22.61		37.33
1948	19.68		19.69		24.90		34.47		42.03		51.80		52.32		53.16		46.59	a	36.47	a	26.90		11.39		34.95
1949	-8.81		15.11	a	28.48		36.55	a	44.26		47.23		54.65		55.90		48.17		31.94		30.80		20.19		33.71
1950	14.55		19.22	a	27.19		34.90		38.81		47.50		54.87		54.58		48.97		40.13		31.73		29.26		36.81
1951	15.97		23.21		22.68		35.37		42.97		46.43		56.29		54.68		45.30		37.13		27.07		18.58		35.47
1952	15.35		14.79		23.55		36.47		42.94		48.70		53.32		54.97		46.87		37.68		22.47		24.32		35.12
1953	30.71		25.68		29.53	a	33.40		39.70	a	46.23		55.30	a	53.81		47.90	a	36.97	a	33.17		22.84		37.94
1954	25.29		27.64		27.23		35.42	d	44.19		46.47		56.00	a	51.90	a	44.30		33.74		31.43		20.29		36.99
1955	11.97		12.86		21.55		32.00		40.71		49.83		54.87		55.61		44.60		36.71		24.45	a	24.16		34.11
1956	24.37	a	14.38		26.29		36.53		44.90	a	48.43		56.87		52.94		44.60		36.58		25.38	a	22.16		36.12
1957	9.94		20.07		29.48		36.60		46.00		50.43		57.52		58.17	b	48.07	c	36.81		24.37		25.58		36.92
1958	18.58		29.00		28.13	a	35.27		47.13		52.53		57.10		58.74		46.37		39.13		30.21	a	31.03		39.43
1959	27.65		28.07		30.29		36.87		40.03		51.60		57.71		53.03		46.23		39.16		27.63		23.26		38.46
1960	20.03		21.66		29.06		36.57		41.23		50.87		61.48		51.90		49.17	a	36.84		31.33		22.58		37.73
1961	22.94		30.68		32.26		34.30		43.27	a	53.93		56.87		60.35		44.03		36.68		27.73		22.74		38.82
1962	13.32		24.32		26.81		37.73		43.61		48.93		55.45		52.90		46.40		38.90		32.70		28.74		37.49
1963	17.81		30.96		31.19		35.53		46.65		49.63		54.23		55.29		52.13		44.16		32.90		22.87		39.45
1964	18.48		15.76		21.81		33.23		41.48		50.47		57.65		53.10		43.30		37.42		29.17	a	25.00		35.57
1965	25.29		25.21		25.26		38.53		41.61		49.80		56.52		54.52		43.00		40.00		34.27		25.43	a	38.29
1966	25.10		23.82		29.29		35.23		45.10		49.30		55.29		53.61		50.10		34.06		33.00		24.68		38.22
1967	26.42		26.64		29.74		32.27		41.06		50.23		58.87		56.90		49.70		34.77		31.67		19.45		38.14
1968	19.48		27.52		31.32		31.67		40.74		49.57		56.13		51.81		44.10		35.84		30.33		23.52		36.84
1969	23.35		23.93		25.58		36.57		44.52		50.93		54.90		53.29		44.97		31.23		27.50		24.26		36.75
1970	24.74		26.61		28.77	a	30.13		40.97		50.80		55.26		54.06		38.70		32.68		31.90	a	21.00		36.30
1971	19.71		21.96		22.90		33.90		42.45		48.33		56.16		59.39		40.97		35.16		29.77		22.13		36.07
1972	20.35		22.72		29.77		33.20		42.48		51.67		54.90		57.16		41.60		37.35		30.43		18.90		36.71
1973	21.74		28.04		31.13		34.77		43.19		49.57		57.13		53.83	a	44.63		35.70	a	30.73		27.55		38.17
1974	15.67	a	21.00		27.97		33.43		39.13		52.27		56.26		54.50	a	45.37		37.57	a	30.30		22.68		36.34
1975	18.32		22.43		27.39		31.30		38.65		46.77		59.29		51.94		45.30		36.84		27.07		23.10	a	35.70
1976	19.10		18.79		21.10		32.45	a	42.65		45.93		56.87		-----	z	46.23		34.03		26.93		18.68		32.98	a
1977	14.33	a	20.14		25.06		35.77		37.68		52.60		53.32		54.52		43.43		34.26		27.13		26.87		35.43
1978	25.63	a	26.82		32.06		35.97		39.84		47.00		56.00		52.17	a	45.00		36.23		25.87		16.19		36.56
1979	7.27	a	22.18		27.77		33.28	a	42.55		48.90		56.19		55.23		48.90		42.16		26.30		27.00		36.48
1980	22.23	a	29.97		31.32		39.00		44.26		46.45	a	56.58		50.77	a	47.40		36.97		28.83		24.26		38.17
1981	27.16		26.29		31.06		37.03		42.00		46.93		53.10		56.19		46.63		34.90		32.87		26.97		38.43
1982	15.58		16.75		28.84		31.38	a	39.29		50.59	a	54.60	a	56.68		46.53		37.46	e	27.16	e	23.52		35.70
1983	26.40	a	29.50		34.61		34.33		42.58		47.83	a	52.61		58.70	a	44.17		38.71		33.53		19.55		38.54
1984	16.71		19.38		30.13		34.17		40.68		46.53		55.68		57.55		42.45	a	35.57	a	30.67		12.68		35.18
1985	11.13		12.29		22.32		36.13		43.68		51.30		62.50	s	51.43	j	41.52	g	32.68	i	19.67	f	11.14	b	26.86	e
1986	20.68		27.25	d	32.96	g	34.50	d	41.62	b	53.50		53.07	b	57.83	a	44.04	b	36.75	c	30.32	k	20.27	e	38.95	b
1987	17.21	c	26.70	e	30.23	a	36.61	b	46.19		51.19	d	53.62	j	49.44	m	45.67	i	34.71	j	30.17	l	25.94	o	34.69	f
1988	11.70	k	21.58	j	27.87	h	36.86	i	41.00	i	51.69	d	53.25	k	50.22	h	40.38	i	40.30	k	29.79	f	17.97		34.83	j
1989	14.03	a	11.28	c	29.97		36.83		40.87	a	50.20		56.52		51.87		44.41	a	36.90		28.43		21.86	b	35.27
1990	24.67	a	18.32	c	29.29		39.53		39.81		47.70	c	56.16		55.23		50.17		36.35		29.23		10.16		36.39
1991	15.23		26.29		29.26		33.17		38.42		44.33		53.42		55.00	a	46.23		34.58		28.37		22.29		35.55
1992	23.30	a	29.10		33.32		37.47		44.20	a	51.41	a	52.21	g	53.90		44.79	f	39.64	c	27.04	e	17.60	a	35.70	b
1993	13.93	c	19.20	c	29.65		35.08	f	47.72	f	46.00	e	48.72	b	52.73	a	45.30		39.73	e	22.54	b	25.13		34.29	b
1994	26.70	a	22.46	b	30.70	a	37.83	a	45.58		49.42	f	58.19		57.35		49.10	a	35.94		22.64	b	22.19	d	37.15	a
1995	24.80	f	28.69	b	29.92	g	35.79	a	42.93	a	48.17	a	55.77	a	52.77	e	47.70	c	35.31	e	33.27	d	28.41	n	42.27	c
1996	24.05	j	21.12	e	32.30	h	37.25	f	41.46	g	49.31	d	57.38	g	54.59	d	-----	z	34.50	o	33.10	i	24.52	j	41.68	i
1997	23.08	g	27.00	k	30.15	k	35.52	e	44.05	i	51.56	e	56.38	g	58.07	d	51.14	a	36.46	e	31.90		23.33	a	41.14	e
1998	27.23	e	29.25	d	31.56	d	35.42	d	43.04	c	47.19	c	60.73	e	57.52	f	54.00	g	34.29	g	31.96	c	22.92	e	36.59	c
1999	24.95	j	24.04	a	35.27	a	45.18	b	48.77	a	48.42	f	52.17	a	57.13	a	43.50		37.23	a	32.93	b	24.63	d	40.08	b
2000	22.05	i	29.52	f	32.53	a	39.11	c	46.78	h	49.92	e	57.96	d	58.22	h	46.92	e	37.78	m	24.68	h	21.16	f	45.29	g
2001	17.33	p	22.56	l	29.56	f	34.33	f	41.84	f	48.28	e	56.67	a	58.36	c	45.96	b	36.13	a	31.97	a	16.41	b	41.97	e
2002	21.09	h	21.04	a	25.36	i	38.36	e	41.65	h	54.48	e	62.33	g	54.96	e	48.57	i	35.27	e	29.40	e	29.70	a	37.60	e
2003	30.00	c	27.43	g	34.52	j	38.77		44.19		52.44	e	63.32		60.52		48.83	a	40.23		26.63		28.58		43.35	b
2004	17.88	g	23.28		33.17	b	40.24	e	45.14	c	49.69	d	58.89	d	57.28	f	47.62	a	41.13	a	27.06	l	21.89	l	42.40	d
2005	19.35	e	23.32		29.81		34.50	b	45.32		48.53		61.26		60.71		47.87		35.43	a	29.73	d	19.14	c	37.91
2006	27.07	b	20.62	b	30.45	b	38.57		45.73	a	55.33		63.87		57.93	b	48.87		37.77		31.31	a	21.87	a	39.95
2007	19.32		28.18		35.33	a	37.77		46.00		52.14	a	64.55	b	57.52		49.10		39.74		30.86	a	24.67	a	40.43
2008	16.39		20.00	a	26.89	c	32.41	c	44.47	a	48.63	c	59.45	b	57.80	a	46.41	a	40.29		36.00		24.17	a	37.74
2009	22.61		25.39		28.66	b	36.53		43.45	b	51.63		58.32		57.90		52.07		37.40	a	31.07		19.84		38.74
2010	28.23		30.96		32.00		35.30		39.39		49.50		55.23		54.97		48.33		43.58		32.59	c	28.39		39.87
2011	21.65		24.14		32.03		33.50		41.00		47.10		54.61		59.03		50.93		41.61		30.10		23.10		38.23
2012	24.71		25.55		32.81		38.93		42.19		48.17		60.81		58.58		48.70		38.03		34.13		28.68		40.11
2013	15.94		25.61		31.13		35.62	a	43.61	c	51.13		61.19		58.77		53.73		36.45		31.57		20.26		38.75
2014	25.26		29.32		33.65		35.80		43.94		50.43		61.32		59.32		51.03		42.65		29.86	a	30.43	a	41.08
2015	25.45		32.21		34.57	a	36.07		47.00		56.03	a	58.90		58.74		49.30		45.68		29.87		25.77		41.63
2016	25.26		29.52		35.52		41.20		44.19		51.20		55.87		55.74		47.73		43.23	a	35.07		18.00		40.21
2017	14.36	c	27.30	a	34.30	a	35.47		42.03	a	50.45	a	61.66	b	59.39		50.17		36.42		34.33		24.10	k	40.53	a
Period of Record Statistics
MEAN	18.79		22.75		28.85		35.81		42.79		49.51		56.80		55.46		46.44		37.37		29.23		21.81		37.06
S.D.	6.54		5.72		3.65		2.45		2.39		2.53		2.83		2.55		2.91		2.65		3.57		4.97		1.76
SKEW	-0.96		-0.65		-0.57		0.51		0.08		0.36		0.09		-0.03		-0.21		0.58		-0.45		-0.58		0.48
MAX	30.71		32.21		35.52		45.18		48.77		57.62		64.55		60.71		53.73		45.68		37.33		31.10		41.63
MIN	-8.81		4.67		16.68		30.13		37.68		43.63		48.72		47.84		38.70		31.23		20.08		9.17		33.71
YRS	96		100		97		102		99		104		98		98		97		95		96		101		78