ARROWROCK DAM, ID

Average of Maximum Temperature (Degrees Fahrenheit)

(100448)

File last updated on April 24, 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	43.82	m	38.32		38.32	k
1912	34.32		42.89	a	51.81		62.37		73.81		86.63		89.50	a	87.58		74.00		63.13		52.03		36.87		62.91
1913	33.68	c	37.43		48.19		68.17		76.94		82.27		88.87		90.84		82.53		64.65		51.80		36.10		63.45
1914	42.52		42.61		60.52		67.37		80.10	a	80.13		93.84		91.45		78.23		69.23	a	54.80		33.39		66.18
1915	36.61		48.75		61.94		72.33		68.03		76.47		86.14	c	97.90		-----	z	-----	z	49.17		40.63	a	63.80	b
1916	33.03	a	42.21		54.19		68.27		-----	z	79.08	r	86.67	a	85.62	b	-----	z	59.64	c	42.04	b	32.57	c	56.03	c
1917	41.33	y	36.93		41.71		54.03	a	64.86	b	77.00		94.73	e	90.39	c	82.85	d	67.92	g	53.57	i	44.00	a	65.17	c
1918	39.34	b	39.96	b	52.53	a	58.52	c	67.76	b	87.41	c	90.62	g	82.59	b	80.08	e	63.77		47.33	f	34.34	b	60.63	b
1919	36.07	a	39.89		48.33	a	62.59	c	75.64	c	82.19	d	93.43	c	93.29		79.40	e	55.67	d	41.57		28.57	c	61.39
1920	34.17	a	44.19	b	45.92	g	56.48	e	68.57	a	78.33		92.90	a	90.16		77.13		60.03	a	45.81	d	36.64	c	62.22	a
1921	38.24	f	40.77	b	51.97	b	56.13		67.20	a	80.60		90.39		91.23		73.64	b	67.08	f	49.71	b	36.64	c	63.83	b
1922	27.46	c	36.04	d	43.03	a	54.87		67.97	a	84.80		90.92	e	90.07	a	83.00	a	68.84		44.22	c	34.19	d	60.45
1923	38.31	e	33.33	a	47.20	a	59.50		68.58		71.83		91.00		88.33	d	81.53		59.97		48.89	c	35.00	e	60.29
1924	28.26		48.07	b	48.14	c	61.08	d	80.35		80.67		93.52		91.61		80.27		63.07	c	45.04	c	27.04	g	65.46	a
1925	34.23		40.60	c	51.21	b	61.03		73.66	b	78.75	b	93.54	c	87.24	b	77.32	b	59.79	b	45.25	b	37.45	b	61.67
1926	33.90		44.00		56.66	b	67.23		71.60	a	87.52	a	95.74		90.73	a	73.85	d	67.67	d	50.56	c	36.20	k	67.22	a
1927	-----	z	39.13	e	48.76	b	58.63	c	64.71		80.31	d	91.30	a	87.97		74.27		67.20	a	47.58	d	31.13	h	65.98	b
1928	32.08	f	39.11	a	50.43	c	54.57		76.10		76.57		91.94		90.13		82.69	d	64.57	h	46.24	e	30.79	g	67.53	c
1929	25.23	e	29.91	f	48.29	c	55.72	a	70.52		76.47		89.54	e	95.78	d	76.53		68.60	f	46.50	d	42.21	c	62.68	b
1930	23.55		44.15	a	52.90	a	67.37	c	66.03	a	78.32	b	94.74		90.38	b	80.25	b	61.70	d	39.78	g	25.48	b	62.26	a
1931	31.67	d	39.56	a	50.38	g	62.71	b	76.55		86.40		97.26		96.77		80.11	b	65.13		39.38	f	31.29	g	70.68	c
1932	29.93	d	34.12	c	45.87	a	60.41	c	68.73	a	78.27		88.93	a	89.00	b	82.27		63.84		48.32	b	29.23		59.91
1933	33.03	b	28.81	b	42.94		60.20		64.32		84.73		95.26		91.53	a	77.97	a	70.54	c	49.70		41.10	a	61.68
1934	41.42		50.74	a	60.77	a	70.20		79.77		80.48	a	96.60	a	95.61	c	78.39	b	64.29	c	50.67	c	35.11	d	67.00
1935	33.39		38.93		46.13		57.50		67.60	a	80.62	a	89.90		89.19		83.18	b	65.32	c	39.18	b	33.97	a	60.41
1936	31.48	d	32.04	a	42.53	a	62.27		74.37	a	76.81	i	94.61		90.52		78.13		69.53	a	46.93	a	36.38	b	59.89	a
1937	22.07	d	34.07	a	49.97		54.55	a	73.47	a	77.72	a	92.38	w	88.50	a	82.17	a	66.75	c	48.90		39.16		57.94	a
1938	35.75	c	44.37	a	47.19	d	61.37		66.52		80.07		88.47	a	88.97		84.50		63.87		39.90	a	37.31	b	61.52
1939	36.23	a	34.42	b	48.32	i	65.13		75.94		77.10		91.81		93.06		79.20		62.16		52.00		44.14	c	64.65	a
1940	38.17	b	42.69		54.87		60.23		76.55		87.77		93.42		94.35		77.73		66.68		41.37		40.90	b	64.56
1941	37.68		46.57		60.13		64.33		74.61		79.60		93.06		87.55		71.47		61.74		48.67		38.83	h	65.95	a
1942	28.14	c	37.46		49.16		61.67		62.77		74.33		93.61		91.26		79.90		66.23		45.42	d	33.68		60.30
1943	33.74	h	39.07		45.77		64.37		65.94		73.07		90.03		88.94		83.80		64.74		46.63		37.83	b	63.65	a
1944	33.45	b	40.29	a	47.37	a	57.67		70.74		71.63		88.61		86.87		78.80		70.71		42.77		34.38	b	60.27
1945	34.68		41.82		47.26		55.63		68.16		73.43		91.45		89.84		74.90		68.81		42.43		32.90		60.11
1946	28.90		34.21		49.10		63.77		68.45		79.33		92.19		90.23		76.03		53.80	a	43.86	a	40.00		59.99
1947	29.23		43.93		54.03		60.20		75.39		73.27		92.52		88.03		77.63		64.71		41.27		36.68		61.41
1948	35.39		39.90		44.13		57.17		68.03		79.83		86.52		87.32		77.90		66.17	a	42.57		27.32		59.35
1949	13.29		33.22	a	47.87		67.37		72.77		78.70		90.55		90.26		82.13		57.48		53.33		35.65		60.22
1950	30.35		38.46		45.65		58.53		66.87		75.30		89.23		88.35		78.43		67.10		47.63		40.84		60.56
1951	32.00		40.04		44.71		64.43		68.81		75.80		92.59	b	87.68		79.27		57.94		43.90		32.71		59.99
1952	30.25	c	33.34		43.52		65.23		70.55		77.83		88.61		90.00		82.57		72.55		43.40		37.45		61.28
1953	42.00	a	43.79		50.90		57.10		62.32		71.47		91.87	a	88.06		82.73		67.55		52.50		35.19		62.12
1954	37.40	a	44.07		47.03		61.65	d	73.84		72.20		91.33	a	85.13		78.10		63.48		52.43		35.06		61.81
1955	28.45		34.71		41.71		52.17		65.55		80.30		86.03	a	93.74		78.40		64.81		38.72	a	37.68		58.52
1956	36.58		31.17		49.16		60.83	a	69.81		78.03		91.06		86.45		80.83		60.10		42.34	a	35.45		60.15
1957	26.45		38.18		49.17	a	57.47		68.52		79.80		90.06		89.52		81.53		60.06		41.70		37.52		60.00
1958	31.48		44.54		46.90		55.07		78.10		77.80		89.42		92.77		77.90	a	70.87		45.27		42.13		62.69
1959	39.68		42.29		51.48		66.03		65.87		84.07		94.35		87.90		72.90		61.61		47.87		37.84		62.66
1960	32.94		38.21		50.84		63.50		68.71		84.13		97.48		86.81		82.76	a	64.10		45.66	a	36.45		62.63
1961	38.42		44.71		50.97		60.63		73.47	a	90.43		96.29		95.39		72.03		61.40	a	42.90		34.87		63.46
1962	29.06		37.50		47.13		66.90		66.26		80.10		87.97		86.35		80.80		63.90		48.97		41.32		61.36
1963	32.87		50.75		52.58		56.60		70.97		74.07		87.61		89.55		82.57		67.94		46.73		34.45		62.22
1964	32.10		35.31		41.84		55.77		66.26		72.57		90.68		84.39		72.87		66.26		44.37		39.20	a	58.47
1965	36.48		41.29		47.90		59.00		65.61		75.27		87.52		84.81	d	68.73		70.26		51.93		37.68		60.54
1966	37.58		40.71		50.84		60.30		74.97		77.07		90.94		89.23		81.97		61.94		48.90		36.94		62.61
1967	38.39		44.64		49.39		51.23		68.74		75.70		92.77		94.81		82.87		60.84		48.33		33.26		61.75
1968	34.94		45.17		54.58		55.73		68.23		78.37		92.90		79.52		74.43		61.42		44.40		36.19		60.49
1969	36.19		37.86		49.55		60.53		73.71		77.50		88.42		90.90		79.47		56.61		48.00		36.77		61.29
1970	34.73	a	46.79		48.10		52.03		67.94		79.67		88.03		92.10		70.70		57.52		45.77		33.55		59.74
1971	33.48		41.14		44.52		57.53		69.32		74.70		88.26		93.71		71.63		58.19		42.47		33.10		59.00
1972	32.19		36.45		51.00		55.77		71.13		78.83		87.35		89.55		71.47		61.65		43.57		30.71		59.14
1973	34.84		44.57		51.03		57.77		72.23		78.70		90.65		89.10		75.00		63.23		41.60		39.26		61.50
1974	29.61		39.36		46.81		56.80		66.03		84.73		87.65		86.13		80.53		64.68		45.97		35.16		60.29
1975	31.32		36.64		44.55		48.67		64.13		74.17		92.35		82.19		80.00		59.55		44.00		34.68		57.69
1976	32.23		36.83		41.39		55.80		71.84		74.63		88.42		-----	z	76.33		63.03		50.17		37.58		57.11	a
1977	27.45		43.93		46.19		65.83		62.26		84.30		88.00		88.00		75.27		64.10		43.57		38.68		60.63
1978	39.35		40.64		56.26		55.57		64.81		77.59	a	86.23		85.23		71.70		67.26		44.73		33.06		60.20
1979	25.81		38.93		50.32		56.27		69.52		80.27		89.84		87.26		84.27		66.94		42.53		39.32		60.94
1980	34.77		44.66		47.90		62.33		66.87		75.57		88.52		83.68		75.07		64.61		46.53		37.87		60.70
1981	38.65		44.07		53.42		59.50		66.19		75.73		88.97		93.71		80.27		59.16		50.23		39.16		62.42
1982	31.29		33.25		47.77		54.40		66.90		78.87		84.26		90.03		74.33		59.81		42.80		37.16		58.41
1983	40.06		45.29		51.58		56.30		67.81		76.70		83.68		89.65		77.10		64.26		48.14	b	30.80	a	60.95
1984	29.32		35.90		49.03		56.07		65.74		73.40		89.45		89.61		74.40		58.61		43.83	a	28.61		57.83
1985	26.77		35.14		45.68		64.20		71.71		81.93		97.67	s	87.95	j	68.00	g	58.73	i	36.92	f	24.72	b	50.02	e
1986	38.16		43.42	d	57.00	g	58.19	d	70.38	b	86.57		83.66	b	93.27	a	67.57	b	63.96	c	46.16	k	35.65	e	64.08	b
1987	33.25	c	43.91	e	51.47	a	69.68	b	75.65		83.58	d	88.90	j	87.53	l	84.24	i	71.48	j	50.21	k	40.25	o	59.59	f
1988	31.35	k	45.11	j	51.61	h	65.71	i	73.82	i	85.58	d	93.40	k	92.30	h	77.05	j	74.75	k	45.17	f	31.74		58.66	j
1989	29.20	a	30.33	d	48.16		64.93		69.17	b	82.10		94.35		85.90		79.62	a	61.77		46.90		37.62	b	60.84
1990	39.77	a	40.08	c	54.81		66.10		66.70	a	81.21	b	91.13		88.68		85.77		62.32		46.33		29.04	e	62.66
1991	32.00		49.68		50.42		56.63		65.35		76.69	a	92.13		92.10		79.43		63.55		42.17		38.55		61.56
1992	40.47	a	49.93		60.97		65.97		78.52		84.33		86.06		91.26		77.57		69.13		39.87		33.65		64.81
1993	30.00		36.00		47.81		56.30		74.48		73.33		78.42		82.87		78.77		65.11	c	44.87		39.48		58.95
1994	39.35		39.58	b	57.58		64.30		73.48		83.58	f	93.61		94.39		84.38	a	61.65		38.76	a	35.44	d	62.05	a
1995	38.92	f	50.15	b	49.12	g	58.55	a	66.29		74.93	a	87.80	a	86.11	c	79.04	b	62.50	e	49.29	b	41.65	n	68.30	c
1996	38.19	j	38.87	f	53.09	h	62.12	f	66.36	f	80.32	b	92.58	g	89.85	d	-----	z	59.73	p	50.23	h	38.27	i	85.09	j
1997	36.48	f	42.41	k	56.05	k	60.38	d	75.30	h	80.96	c	88.65	e	91.07	c	81.87		62.39	c	47.52	a	35.35		68.53	d
1998	41.56	d	45.61		52.21	c	58.66	a	66.18	c	72.59	c	92.68	c	90.92	f	84.38	f	62.20	f	48.64	b	37.38	e	57.28	c
1999	38.78	h	41.39		53.10	a	66.41	a	73.32		77.25	f	89.10	a	90.60	a	79.23		69.14	b	54.41	a	35.23	e	65.19	b
2000	35.59	i	44.96	f	51.93	a	64.43	b	72.96	f	81.33	c	92.66	b	93.91	h	77.21	b	58.47	l	40.73	h	34.36	f	73.51	g
2001	34.80	p	41.50	l	55.85	e	59.92	f	78.46	e	82.62	d	87.19		94.27	a	82.89	b	59.93	a	49.50	b	27.48	d	68.69	c
2002	32.00	i	38.67	a	45.68	i	59.12	e	66.74	h	81.12	d	95.04	g	85.31	e	77.76	i	63.92	e	49.17	f	42.79	b	61.82	f
2003	42.89	c	46.65	h	52.48	j	58.93		68.10		81.08	e	95.65		91.45		81.69	a	70.52		44.60		41.52		67.64	b
2004	31.75	g	41.52		58.48	b	65.20	e	69.96	c	80.61	b	91.86	b	87.76	b	76.33		63.57	a	44.39	l	37.61	m	70.59	c
2005	35.52	d	43.85	a	55.45		59.89	b	70.36	c	76.62	d	94.32	f	92.07	d	78.17	f	61.80	a	44.77	d	31.25	c	57.16	b
2006	38.17	b	37.81	b	47.62	b	62.45	h	75.96	g	84.78	g	95.00	b	88.70	d	77.04	b	62.52		50.96	g	36.89	c	60.47	d
2007	35.28	f	46.54	d	58.00	g	65.45	h	78.00		82.24	a	97.69	b	91.55		78.30		60.55		48.07	a	35.13		68.67	c
2008	31.61		38.00		45.79	b	55.17		69.39		78.62	a	92.87		92.16		80.97		69.55		52.54	b	35.65	h	64.24	a
2009	35.19		41.70	a	47.06		58.80		73.03		77.77		92.26		90.70	a	85.17		59.16		48.73		32.55		61.84
2010	39.39		44.57		53.97		57.73		62.16		75.17		89.06		89.10	a	81.00		68.39		45.57	b	39.17	b	62.11
2011	35.21	c	41.18		47.81		53.87		66.68		74.33		89.58		94.00		85.17		64.19		45.17		39.42		61.38
2012	38.74		40.83		50.90		63.76	a	69.45		79.90		95.16		93.74		83.50		62.90		50.67		40.32		64.16
2013	29.55		43.39		53.61		60.52	a	72.14	c	82.97		97.90		93.55		78.57		61.77		47.33		34.26		62.96
2014	38.26		43.82		53.10		60.60		73.00		80.23		95.45		89.16		81.33		68.52		45.27		42.35		64.26
2015	35.94		50.36		60.35		62.70		72.13		88.79	a	89.77		91.97		82.23		70.90		45.41	a	35.55		65.51
2016	37.90	a	48.41		53.77		68.03		70.65		84.97		90.90	a	89.61		76.17		64.03		53.17		30.42		64.00
2017	29.79	g	40.56	a	52.67	a	57.23		69.17	a	81.24	a	96.69	b	92.87		78.93	a	59.35		48.90		34.30	k	67.76	b
Period of Record Statistics
MEAN	33.80		40.79		50.10		60.28		70.17		79.23		90.91		89.76		78.69		63.82		46.40		35.94		61.38
S.D.	5.03		4.83		4.68		4.68		4.34		4.24		3.47		3.32		3.89		3.88		3.72		3.96		1.91
SKEW	-0.84		-0.05		0.48		0.23		0.42		0.32		-0.35		-0.25		-0.55		0.05		0.11		-0.46		0.63
MAX	42.89		50.75		61.94		72.33		80.35		90.43		97.90		97.90		85.77		72.55		54.80		44.14		67.00
MIN	13.29		28.81		41.39		48.67		62.16		71.47		78.42		79.52		67.57		53.80		38.72		24.72		57.69
YRS	90		99		95		101		99		101		98		100		97		95		93		94		67