CHIEF JOSEPH DAM, WA

Average of Average Temperature (Degrees Fahrenheit)

(451400)

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
1949	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	49.39		43.83		28.90		40.71	i
1950	9.71	b	29.93		40.69		48.97		58.81		68.18	k	74.58	k	74.68	i	66.55	i	50.07	c	37.57	g	34.00	k	39.70	f
1951	28.48	i	30.29		34.24		50.65		59.31		65.47		73.58		71.74		63.32		49.89		34.42		20.90	a	50.34	a
1952	18.27		28.21		36.50		50.85		58.84		64.18		71.56		70.69		64.97		54.03		34.55	b	31.60		48.69
1953	34.90	a	36.79	b	43.46	c	49.57		57.26	f	62.13	c	71.73		70.63		64.29	a	52.75	a	40.28		34.47	a	51.00	a
1954	24.37	a	36.19	a	38.97	b	48.93	b	60.23	c	62.19	a	68.67	b	-----	z	61.32		47.40		42.72	a	29.37		47.31	a
1955	27.10		27.41		34.22	b	45.82		53.12	a	66.00	a	70.27	a	70.12	b	63.23		50.34		30.26	a	22.90	a	46.73
1956	27.03		18.93		36.10		53.08		61.32		-----	z	74.26		69.37		61.29	a	48.98		33.32	b	30.47		46.74	a
1957	14.37	a	27.16		40.85	a	51.83		62.90	a	66.62		70.23		68.44		67.73		50.15	a	38.83		34.77	a	49.49
1958	32.66		39.52	a	42.68	a	50.12		67.24		72.25		76.15		76.00		61.98		51.74		34.55		32.13	a	53.09
1959	28.29		28.52		42.53	a	51.29	a	56.71		65.50	a	73.32		70.50		60.30		49.23		33.92		31.85		49.33
1960	22.40		32.76		41.08		50.27		57.02		67.35		78.55		70.10		64.18		53.35		37.40	a	26.92		50.11
1961	30.58		37.98		42.79		51.27		58.27		70.17		75.03		76.40		61.15		49.37		32.58		27.61		51.10
1962	23.66		33.38		39.50	a	53.62		56.79		65.93		71.60		70.13		65.12	a	51.81		42.03		34.07	a	50.64
1963	24.52		37.88	c	44.74		49.41	a	59.65		66.32		70.92	a	72.05		68.68		54.48		40.02		28.10		51.40
1964	28.98		29.19		-----	z	50.53		57.87		65.43		71.98		68.18		60.40		50.29		38.88		25.68		49.77	a
1965	28.87		32.75		39.03		52.78		58.35		66.38		73.42		72.53		60.42		52.94		40.75		30.61		50.74
1966	24.81		33.04		41.81		52.27		59.63		63.17		70.35		72.11		67.23		50.85		41.40		34.76		50.95
1967	34.39		40.62		42.48		47.87		58.73		67.35		73.19		75.98		70.35		51.45		39.88	a	27.42		52.48
1968	27.32		36.88		44.45		48.52		58.58		65.43	a	72.98		67.16		63.13		47.61		39.82		27.42	a	49.94
1969	14.45		25.16		37.45	a	51.40		61.85	a	70.12		71.06		70.73		62.64	a	48.42	a	38.40	a	31.92		48.63
1970	24.35		34.06	a	41.77		47.92		59.90		69.88		74.61		73.81		58.95		48.87	a	35.58		24.25	a	49.50
1971	25.83	a	32.80		36.50		49.42		60.19		62.77		71.42		75.00		58.45		48.19		38.20		21.76		48.38
1972	22.07	a	31.29		42.89		46.43		58.79		63.82		-----	z	72.65		59.40	a	49.15	a	41.08		27.02		46.78	a
1973	25.02		32.21		45.37		53.32		60.76		-----	z	75.27		74.61		63.83		50.15		34.73		-----	z	51.53	b
1974	25.53	a	36.59	a	41.53		51.15		55.58		66.80	g	70.48	a	73.28	a	64.47		50.24		39.53		33.11		49.23	a
1975	23.97		24.00		36.90		47.10		57.00		64.22		77.26		69.39		64.35		50.16	b	38.52		30.47		48.61
1976	28.69		35.36	a	38.77		49.67		57.50		62.80		71.61		68.58		66.30		50.31		38.03		29.95		49.80
1977	22.97		-----	z	43.85		55.05		56.42		71.33	a	73.10		78.08		59.95		50.10		36.75		29.37		52.45	a
1978	27.57	a	33.70		44.40		50.65		57.63		68.98		74.84		71.98		60.87		50.16		33.67	f	22.11	d	51.17	a
1979	14.32		27.46	b	44.35		50.18		61.47		69.72	a	75.90		74.57	a	65.95		54.66		34.70		34.00		50.61
1980	19.47		31.10		40.28	a	53.38		60.56		62.68		71.53		68.90		63.02		51.18		39.63	d	30.37		49.34
1981	35.89		36.12		46.56		50.58		58.77		61.63		71.00		76.55		63.62		49.15	a	41.33		29.60		51.73
1982	25.33	b	31.62		42.02		47.20		58.00		70.84	b	70.70	c	72.16	b	62.60	a	49.76		33.62	b	28.42		49.36
1983	33.23	a	36.80	a	46.08		50.93	a	60.57	a	65.83		67.68		73.97		59.50		49.02		41.46	b	20.62	a	50.47
1984	29.34		34.78		45.60		49.57		55.52		63.93		72.40		73.08		59.02		46.70	a	37.00		17.52	a	48.70
1985	23.26	b	22.30		37.37		53.37		62.93	a	68.36	a	79.79		71.42		59.16	a	50.13		23.33		22.69		47.84
1986	27.40		30.69	a	45.76		50.63		60.63		71.93	a	71.03		78.02		60.33		52.78	d	40.10		30.89		51.68
1987	28.08		36.66		45.76		56.52		62.92		70.64	a	72.69		73.74	b	68.67	a	52.87		41.73		29.92		53.35
1988	25.65		35.80	a	45.24		54.79	a	59.65		66.48	a	74.95		72.98		65.28		55.50		39.95	a	29.31		52.13
1989	30.48		24.94	a	43.46	g	54.17		59.94		71.20		73.77		71.06		64.58		51.06		41.07	a	33.08	a	52.31	a
1990	36.32	a	30.38		45.37		55.78		58.40		65.64	a	76.65		75.03		69.85	d	49.25	e	42.16	h	23.60	k	56.27	b
1991	23.50		40.71		-----	z	52.32		59.28	a	63.91	b	75.88	a	76.60	a	68.43	c	49.21		37.71	a	34.15	a	52.88	a
1992	33.03		39.90		49.60		53.64	a	64.52	c	73.63		73.58	a	73.22	a	63.25	b	51.63		37.28		22.31	b	52.97
1993	20.95		28.17	b	38.85		48.62		64.06		65.28		67.73		70.18	a	62.60		53.05	a	31.28		30.85		48.47
1994	32.98		32.52		45.02	a	51.75		59.65	a	64.87		76.89		72.74		66.03		49.90		33.20	b	26.68		51.02
1995	28.73	a	37.34		43.31		51.72		63.26		67.33		75.03		68.56		67.70	b	49.89		40.00		31.66		52.04
1996	24.50		29.64		41.65		51.52	a	55.66		64.68	b	76.79	c	75.29	b	62.67		49.28	b	34.22	e	22.43	d	49.03
1997	25.02	b	30.48	c	41.24	d	50.39	b	60.10	g	65.62	j	75.05	j	77.84	l	67.08	j	52.52	h	39.98	e	31.96	c	36.51	f
1998	29.13	d	39.00	c	45.37		52.67	a	61.52		68.25		78.75	a	76.45		70.74	a	50.77		42.67		28.42		53.65
1999	32.65	a	35.48	a	43.13		50.18		55.57	a	65.03		71.27		75.19		62.50		49.82		42.25		34.82		51.49
2000	28.24		32.59		43.65		53.90		58.29		67.70		72.57	a	72.23		61.80		49.45		32.22	a	25.22	b	49.82
2001	29.17	a	31.04	a	42.94		50.90		61.77		64.52		73.31		75.27		66.53		49.15		40.58		31.81	b	51.42
2002	32.32		34.46		38.32	a	51.27		57.98		67.50		75.43	a	72.27		63.64	a	47.55		38.27		34.90		51.16
2003	32.69		34.73		44.68		50.62		58.44		69.62	a	77.50		74.82		66.36	a	54.35		32.58		27.76		52.01
2004	28.55		33.69		47.11		54.37		60.05	a	69.18		76.55		76.05		62.70		52.40		38.27		32.69		52.63
2005	26.47		35.57		46.60		52.67		61.61		65.39	b	74.43	a	74.44		63.10		52.45		35.77		25.08		51.13
2006	33.95		33.98		42.08		51.62	a	60.34		68.03		77.40		72.92		64.55		51.13		35.88		26.66		51.55
2007	24.81	b	35.50		44.94		50.82		61.06		65.72		78.03		72.39		63.38		48.81		36.15		27.55		50.76
2008	22.30	i	32.29		41.73		46.88		61.19		64.68		74.19		72.34	b	62.52	a	50.15		39.33	a	22.16		51.59	a
2009	23.82		27.83	d	37.95		49.71	b	60.10		69.38		76.65		74.56		65.92		46.58		39.88	b	22.89		49.61
2010	33.19		38.09		44.63		50.43		54.15	d	61.50		73.35		70.21		62.57		52.15		31.91	a	27.42	a	49.97
2011	26.82		28.59		40.92		45.65		53.61		60.73		65.34		75.76		66.93	a	50.39		35.60		28.89		48.27
2012	26.03		32.95		41.18		50.88		56.89		61.80		74.39		76.59	b	65.10		51.45	a	40.64	a	32.70	a	50.88
2013	25.11		33.66		42.66		48.94	c	54.65	e	66.02		78.52	a	73.90		65.88	d	48.42		35.16	a	24.66		49.80
2014	31.69		29.77		42.84		51.18		59.25	c	66.82		77.32		75.68		64.87		55.30	a	35.80	b	31.67	a	51.85
2015	31.57	c	40.48	c	48.60		50.43	b	63.08	a	74.50	a	78.79		74.44		63.12	a	55.26		37.68		27.36	t	56.18	a
2016	29.68		35.92	i	45.82		56.04	d	62.29		67.90		72.56		72.93	j	61.48	d	50.83	a	45.37		24.06		51.60	b
2017	22.98	a	27.48		41.08		49.75		57.93	a	66.24	a	77.80	k	77.11	m	65.86	h	48.70	c	39.83	g	28.17	g	44.88	e
2018	31.62	b	30.48	b	40.73		51.45		65.55		66.55		76.87		74.02		67.86	s	46.45		38.70		33.24		50.51	a
2019	31.26		23.89		36.02		52.43		62.61		67.77		73.42		75.48		63.10		46.77		37.45		31.24		50.12
2020	31.81		36.19		42.77		50.55		59.40		66.41	b	72.39		72.66		65.33		52.88	a	-----	z	-----	z	55.04	b
Period of Record Statistics
MEAN	27.01		32.58		42.14		50.99		59.45		66.60		73.74		72.97		63.77		50.54		37.61		28.64		50.49
S.D.	5.31		4.63		3.38		2.32		2.77		3.05		2.99		2.60		2.89		2.15		3.76		4.22		1.54
SKEW	-0.81		-0.46		-0.37		0.04		0.14		0.37		-0.20		-0.18		0.34		0.42		-0.85		-0.48		-0.05
MAX	36.32		40.71		49.60		56.52		67.24		74.50		79.79		78.08		70.74		55.50		45.37		34.90		53.65
MIN	9.71		18.93		34.22		45.65		53.12		60.73		65.34		67.16		58.45		46.45		23.33		17.52		46.73
YRS	69		69		68		71		69		66		67		66		67		71		67		66		50