CHIEF JOSEPH DAM, WA

Average of Maximum Temperature (Degrees Fahrenheit)

(451400)

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
1949	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	62.45		52.40		37.00		50.62	i
1950	18.69	b	37.68		50.65		61.67		73.97		83.37	k	93.30	k	92.68	i	84.76	i	58.96	c	47.00	g	38.50	k	50.27	f
1951	36.09	i	36.96		43.61		66.30		73.58		80.53		92.48		89.23		79.30		59.94		41.57		27.45		62.81	a
1952	23.87		35.93		45.61		64.90		73.77		78.00		88.55		87.77		81.43		70.03		42.61	b	35.74		60.69
1953	40.37	a	45.62	b	55.21	b	61.80		71.12	f	75.29	b	89.61		86.87		81.93		66.17	a	47.73		41.43	a	62.91	a
1954	31.57	a	44.15	a	53.20	a	64.82	b	76.72	b	75.41	a	85.66	b	-----	z	75.43		60.03		49.93		34.61		59.23	a
1955	31.77		34.89		44.06		57.43		66.07	a	82.07		85.73	a	88.10	b	79.30		62.39		36.55	a	29.53	a	58.16
1956	33.26		27.14		44.97		68.30		77.00		-----	z	92.58		85.71		77.50		59.61		39.75	b	35.94		58.34	a
1957	21.45		35.68		50.61		64.93		77.29		82.17		87.16		83.97		83.77		59.87	a	47.37		40.57	a	61.24
1958	37.48		46.04		52.77		62.13		83.84		85.83		93.19		94.87		78.03		64.97		42.63		36.33	a	64.84
1959	34.10		36.57		53.26		64.17		68.65		78.30		89.77		85.71		71.93		60.81		43.83		36.90		60.33
1960	29.74		41.66		51.94		61.97		68.48		81.03		95.06		83.65		79.70		66.81		45.93		32.94		61.58
1961	36.65		44.93		52.90		63.40		70.26		85.00		89.23		92.77		76.30		62.94		42.73		34.10		62.60
1962	30.16		39.68		49.06		67.27		68.45		80.27		86.03		83.16		81.20		62.48		49.53		39.40	a	61.39
1963	32.29		43.41	a	55.42		58.47		72.55		79.10		84.13		86.00		84.40		67.23		46.70		33.19		61.91
1964	35.77		39.14		-----	z	63.20		70.81		77.73		86.29		81.61		74.77		63.97		44.83		31.48		60.87	a
1965	34.48		41.04		50.26		63.47		71.77		79.67		87.94		85.39		74.87		68.16		48.20		36.48		61.81
1966	31.81		40.68		52.35		66.30		74.13		77.07		84.16		87.26		82.77		63.29		49.30		39.61		62.39
1967	40.45		50.82		53.71		59.87		72.23		79.83		87.61		92.03		87.57		63.29		49.13		33.42		64.16
1968	33.74		46.03		55.81		62.30		72.90		79.55	a	88.03		80.48		77.87		59.26		47.03		33.50	a	61.38
1969	21.29		32.86		46.87		62.17		76.19		84.30		85.45		88.58		77.23		61.06		46.00		35.61		59.80
1970	30.10		41.25		51.97		60.43		73.94		82.73		90.00		90.90		74.33		62.83	a	43.13		30.52		61.01
1971	32.61		40.11		44.68		59.83		71.97		74.53		84.94		91.48		73.73		61.45		44.40		28.87		59.05
1972	30.03	a	39.03		51.74		59.73		69.94		75.23		-----	z	87.35		73.97	a	63.16		46.00		32.90		57.19	a
1973	31.97		39.68		56.52		66.67		76.29		-----	z	90.87		91.29		78.17		61.32		40.50		-----	z	63.33	b
1974	33.53	a	43.82		51.77		62.37		68.45		80.70	g	83.68		88.53	a	82.33		65.68		45.93		38.61		60.43	a
1975	31.97		32.89		45.13		58.83		70.19		78.60		93.06		83.19		81.37		60.63	a	47.07		37.35		60.02
1976	34.68		43.89	a	48.58		61.60		70.26		76.43		86.29		80.52		82.33		63.84		47.70		36.39		61.04
1977	28.74		-----	z	54.42		71.07		69.61		86.03		88.68		93.87		73.90		63.84		45.60		35.84		64.69	a
1978	33.48		39.29		55.00		61.60		71.16		85.10		89.97		86.29		73.03		65.87		42.52	e	31.04	d	61.20
1979	23.39		35.54		56.97		64.13		76.81		84.62	a	91.26		90.10		82.43		66.87		41.20		39.45		62.73
1980	28.61		36.48		50.00	a	67.13		72.84		75.87		88.58		85.06		77.13		64.87		46.63	c	36.29		60.79
1981	39.87		43.57		59.10		63.73		71.06		73.87		85.16		94.13		79.93		61.35		49.10		36.29		63.10
1982	33.38	b	39.96		51.94		60.40		72.39		85.34	a	84.80	a	88.10	a	76.87		62.35		40.79	a	35.29		60.97
1983	38.43	a	43.00		55.58		64.21	a	76.20	a	79.70		81.68		89.23		74.33		63.74		48.50	b	26.97	a	61.80
1984	35.55		40.48		55.81		61.53		67.48		76.80		89.52		90.06		75.27		60.87		43.70		24.90		60.16
1985	28.97	b	32.75		48.32		67.17		76.55		83.03		98.06		86.87		71.50		60.90		31.80		27.87		59.48
1986	34.16		39.14		56.45		63.03		75.23		87.90		85.77		95.10		72.17		66.74	d	47.83		35.42		63.25
1987	34.84		44.21		56.23		70.43		78.48		86.69	a	86.77		89.94		85.57		68.16		50.00		36.06		65.62
1988	33.06		44.83		57.29		68.45	a	74.61		81.07	a	91.90		89.90		80.87		69.61		46.86	a	34.84		64.44
1989	38.10		33.82		53.79	g	68.60		73.74		86.23		90.29		85.87		82.40		64.77		49.63		38.77	a	64.75	a
1990	43.65		39.50		58.55		69.60		71.19		78.55	a	91.84		90.06		86.33		60.23		52.03		30.07	a	64.30
1991	31.00		49.86		-----	z	66.80		71.94		77.40		91.42		91.74		84.13		63.16		44.10	a	39.45		64.64	a
1992	39.29		46.31		62.87		67.17		80.23		89.23		87.23		90.23		77.87		63.55		43.73		31.00	b	64.89
1993	28.03		36.71		50.03		61.00		79.84		79.23		81.00		85.81		80.40		67.97		43.50		36.00		60.79
1994	38.65		39.96		61.13	a	68.47		76.06		82.43		96.00		90.84		84.97		64.74		41.17		35.84		65.02
1995	34.40	a	46.11		54.19		64.87		78.52		81.50		90.77		84.03		83.33		62.26		48.13		36.58		63.72
1996	31.13		38.28		51.55		64.14	a	68.29		78.27		92.94		91.10		76.93		59.65		42.00		28.03	a	60.19
1997	31.50	a	37.89		49.94		62.20		71.13		75.70		86.81		89.97		78.47		60.68		47.13		36.61		60.67
1998	35.13	a	45.00		56.68		66.13		74.81		82.17		94.84		94.71		87.23		65.00		50.10		34.68		65.54
1999	37.77	a	42.71		53.68		65.10		69.55		79.40		87.26		90.65		79.17		63.16		49.20		40.39		63.17
2000	34.03		39.79		54.32		68.87		71.74		82.53		89.65		89.48		76.50		61.77		39.57		30.27	a	61.54
2001	34.87		39.18		55.00		63.47		77.55		78.07		89.71		92.35		82.57		61.61		48.00		37.93	a	63.36
2002	38.84		43.43		49.32		64.57		71.48		82.87		91.53	a	89.52		79.76	a	63.45		46.40		38.52		63.31
2003	36.45		43.32		56.52		63.27		72.29		85.43		95.48		91.97		82.13		66.55		41.67		34.03		64.09
2004	33.35		40.76		59.48		70.40		73.71		84.97		92.52		91.52		76.90		64.32		46.20		37.23		64.28
2005	31.81		47.46		59.77		66.37		75.35		79.48	a	90.80	a	91.94		78.10		63.39		41.57		30.03		63.01
2006	39.23		43.46		52.52		64.10	a	75.03		82.27		94.58		90.39		80.93		64.19		43.13		32.81		63.55
2007	31.33	a	41.29		55.90		64.27		76.52		80.13		94.65		88.84		79.20		60.23		43.93		33.71		62.50
2008	27.77		41.28		52.48		59.60		75.84		79.10		90.87		88.30	a	78.83	a	62.03		46.45	a	29.55		61.01
2009	30.35		35.72	c	49.03		63.18	b	75.42		84.90		93.68		90.97		82.23		57.94		49.18	b	30.26		61.90
2010	38.94		45.71		57.84		62.70		67.70	d	75.17		90.68		88.13		76.47		64.39		41.63		34.45		61.98
2011	34.55		38.00		51.32		58.37		66.29		73.73		81.71		95.77		84.10	a	61.97		45.50		36.52		60.65
2012	33.52		41.52		52.52		64.57		71.23		74.37		91.10		94.27	a	82.67		64.00	a	47.69	a	38.10	a	62.96
2013	29.90		41.54		56.19		64.41	c	71.77	e	78.40		96.48		90.29		81.38	d	61.39		44.41	a	30.90		62.26
2014	37.23		38.07		54.58		64.53		72.86	c	80.20		94.29		91.55		79.67		66.42		44.59	a	38.16		63.51
2015	35.68		48.80	c	60.68		66.07	b	79.37	a	91.72	a	95.29		89.74		78.31	a	66.87		46.27		32.82	t	68.98	a
2016	33.74		44.95	i	56.65		70.88	d	76.68		82.80		87.06		89.76	j	76.54	d	59.40	a	52.60		32.65		62.90	b
2017	29.80	a	35.96		49.48		61.10		69.90		80.62	a	97.90	k	95.47	l	83.36	h	61.86	c	47.96	g	32.62	g	55.53	e
2018	37.66	b	40.73	b	51.32		63.17		80.00		81.73		93.42		89.71		82.82	s	58.13		47.00		39.19		62.01	a
2019	36.58		30.64		47.77		64.47		76.65		83.10		88.74		91.52		74.13		58.10		45.57		35.32		61.05
2020	37.55		46.52		55.39		64.13		73.00		79.82	b	86.06		86.45		78.03		63.93	a	-----	z	-----	z	67.09	b
Period of Record Statistics
MEAN	33.26		40.58		53.04		64.14		73.40		80.69		89.53		89.00		79.18		63.12		45.44		34.59		62.15
S.D.	4.71		4.60		4.28		3.16		3.66		3.93		3.86		3.50		3.85		2.80		3.70		3.74		1.72
SKEW	-0.73		-0.27		-0.18		0.21		0.26		0.34		-0.04		-0.40		0.06		0.33		-0.74		-0.47		0.10
MAX	43.65		50.82		62.87		71.07		83.84		91.72		98.06		95.77		87.57		70.03		52.60		41.43		65.62
MIN	18.69		27.14		43.61		57.43		66.07		73.73		81.00		80.48		71.50		57.94		31.80		24.90		58.16
YRS	70		69		68		71		70		67		68		67		68		72		69		67		54