COULEE DAM 1 SW, WA

Average of Average Temperature (Degrees Fahrenheit)

(451767)

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
1934	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	78.24	h	62.62		54.20	a	44.64	b	34.66	o	53.82	i
1935	28.69	d	36.41	a	41.50	l	-----	z	-----	z	68.25	j	75.21	c	74.13		69.43	a	52.03		34.98	a	31.69	b	50.32	d
1936	31.18		15.78	b	41.31	b	54.74	c	65.97	b	68.09	b	76.05		75.50	o	65.35	c	57.19		33.75		34.81		49.47	a
1937	12.22	a	25.94	a	44.71		51.02		61.87		67.10		77.42	a	71.35	d	67.26	a	56.43	b	42.12	e	34.39	m	52.49	a
1938	32.00	c	34.31	b	43.07	a	54.00	a	61.93	b	71.65		79.62	c	72.75	e	71.52	a	55.53	a	36.79	a	31.35	d	53.71
1939	34.10	g	30.79	b	43.63	e	55.41	c	63.40		65.45	a	76.62	a	76.86	c	67.98	c	53.14	b	40.18	b	38.14	c	55.60	a
1940	30.44	e	35.22	b	47.29	b	53.85		64.31		71.43	a	75.47		74.78	a	68.98	c	56.23	a	34.56	c	32.54	d	53.76
1941	32.91	c	37.85	a	49.17	a	56.26	a	60.61		66.74	a	76.73		72.03		60.48	a	52.55	a	42.19	d	34.66	f	55.23	a
1942	26.33	e	35.31	b	42.83	a	53.26	a	56.50		61.76	a	68.63	a	74.28	a	66.47	a	53.16		35.00	a	29.42		50.25
1943	18.63		-----	z	37.85	a	52.28		53.95		61.52		72.71		69.79		66.15		51.79		38.00		28.55		50.11	a
1944	26.16		31.47		39.29		51.82		60.90		67.73		74.74		71.26		65.20		55.69		37.55		27.92		50.81
1945	30.98		36.70		41.85		47.68		60.11		65.62		74.71		73.76		60.34	a	53.85	a	36.12		31.92	a	51.14
1946	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1947	25.32		34.20		44.13		50.78		63.56		63.70		71.35		68.89		62.45		50.53	a	37.47		31.84		50.35
1948	27.15		29.66		38.89		45.53		55.02		68.25		67.23		66.77	a	60.83		48.44		37.33	a	21.47		47.21
1949	10.48		24.25		40.40		52.07	a	62.13		64.48		70.85		70.44		64.43	a	47.71		43.48		28.60		48.28
1950	8.35		28.00		38.06		45.94	f	55.02		62.85		72.56		-----	z	72.29	d	47.57	a	36.78		33.15		45.46	b
1951	28.03		31.34		34.27		49.88		57.84		64.37		71.37		70.37	a	62.90	a	48.66		36.87		23.23		48.26
1952	21.82		31.38		39.02		51.38		59.34		65.12		72.84		71.93	a	66.42		55.71		34.78		31.05		50.07
1953	36.10		36.11		41.73		47.80		55.55		59.15		70.81		69.74		63.78		53.31		40.90		33.89		50.74
1954	24.94		35.50		37.40		46.17		58.45		60.68		69.02		66.37		60.88		47.87		43.43		30.77		48.46
1955	27.27		27.38		33.27		43.72		52.98	a	65.82		68.69		70.55		62.67		49.32		28.77		25.16		46.30
1956	28.00		22.24		36.81		51.97		60.69		61.68		74.11		70.85	a	63.10		48.76		33.32		30.25	a	48.48
1957	13.00		25.94	a	39.76		50.77		61.45		65.30		69.48		67.29		66.22		48.00		37.43		35.55	a	48.35
1958	33.81		40.71		41.21		48.03	a	65.21		69.73		75.95		76.02		61.05		51.60		35.23		31.77		52.53
1959	28.98		28.71		40.76		50.22		53.18		63.62		72.52		66.89		58.72		48.13		33.85		30.42		48.00
1960	22.32		32.93		39.56		48.40		53.71		64.80		76.58		67.77		63.03		52.00		38.05		27.37		48.88
1961	31.16		38.77		41.94		48.40		57.00		69.60		74.87		76.23		60.05		48.81		33.37		28.19		50.70
1962	24.05		33.55		37.97		52.07		54.11		63.98		71.77		68.27		64.10		50.24		41.03		34.82		49.66
1963	23.39		35.86		42.71		48.00		58.06		65.32		69.58		72.16		68.03		53.69		39.63		28.10		50.38
1964	30.45		32.48		38.18		47.58		56.81		64.60		71.52		67.11		59.82		50.81		36.55	a	24.34		48.35
1965	29.13		32.41		37.58		51.05		56.10		65.38		72.61		71.48		59.17		53.74		40.62		31.10		50.03
1966	27.92		33.77		40.71		50.48		59.52		62.27		69.82		71.29		66.08		50.42		41.02		34.74		50.67
1967	34.85		38.70		40.37		45.27		56.15		67.62		73.42		76.98		68.75		51.16		39.25		29.40		51.83
1968	30.21		36.86		44.68		47.93		59.21		65.93	a	75.79		68.37	a	63.55		48.18		38.43		27.73		50.57
1969	15.85		27.52		39.63		50.28		61.63		70.88		71.48		71.11		63.22		48.10	a	38.40		32.06		49.18
1970	26.27		35.07		39.97		45.52		58.19		70.58		74.45		72.60		57.14	a	48.76		35.72		28.05		49.36
1971	28.77		34.11		35.82		48.47		59.76		61.12		72.90		77.27		58.37		48.53	a	38.25		25.23		49.05
1972	23.45		31.24		42.58		45.78		59.55		65.02		70.11		73.55		58.13		49.77		39.25		27.05		48.79
1973	26.18		32.68		43.06		50.93		59.47		65.32		73.74		72.08		62.67		49.84		36.05		35.40		50.62
1974	26.60		37.09		41.42		50.27		54.05		68.62		70.44		72.45		65.73		52.35		39.90		33.39	c	51.03
1975	25.85		26.63	a	35.98		45.78		56.56		63.33		76.11		67.50		63.73		49.65		37.43		31.35	a	48.33
1976	29.48	a	34.24		37.89		48.13		56.97		61.60		70.08		66.44		65.90		49.71		37.38		29.50	b	48.94
1977	21.70	a	35.64		40.58		53.95		54.98		68.86	a	70.77		75.47		59.15		49.42		35.95		27.90		49.53
1978	26.76		33.25		43.63		49.77		56.76	b	67.78	a	72.84	b	70.03	b	59.98	b	50.90		32.69	a	22.50	h	51.31	a
1979	13.76		30.23		43.37		48.65		59.97		68.57		75.29		73.69		66.70		54.62	c	33.62		34.78	a	50.27
1980	20.03		31.82	a	39.85		53.32		58.64	b	62.50		72.29		68.60		62.92		52.25	a	39.62		32.66	b	49.54
1981	34.55	b	35.96	a	44.98		49.21	a	56.97		61.25		70.00		75.66		62.68		49.16		40.65		30.26		50.94
1982	25.37	a	34.58	b	41.50	a	45.62	a	56.76	f	69.02	b	70.27	c	71.92	a	62.78	c	50.24		33.71	a	28.19	d	48.47	a
1983	33.80	a	37.74	c	44.73	c	48.42		60.50	b	64.83	i	65.94	d	72.62	c	60.45	b	50.81	e	42.10	a	19.96	e	48.83	a
1984	29.98	b	34.41	a	44.21		47.09	g	53.44	d	62.16	b	72.93	b	72.68		60.02		47.57	a	37.63		20.29	c	48.67	a
1985	22.02	a	25.83	a	37.35	a	51.52	c	60.52	d	66.98	b	80.71	e	70.73	e	57.74	e	48.80	c	21.78	c	20.13	a	47.01
1986	28.18	a	30.58	d	44.64	b	48.37	c	59.24	d	72.08	e	68.62	c	77.06	f	54.73	h	52.12	a	39.26	c	29.93	a	47.30	b
1987	28.57	a	37.72	e	43.84	b	54.48	a	61.68	a	69.98	c	-----	z	-----	z	68.27	b	53.95		40.74	c	29.83	d	48.91	b
1988	27.13	e	34.63	c	43.60	b	52.19	d	57.84	c	65.83	c	73.26	d	73.10	f	64.59	a	56.43	b	39.90	a	29.00	a	49.49	a
1989	30.28	b	25.38	b	38.77	a	52.65		57.36	b	68.35	c	73.03	a	69.79	b	64.64	b	50.34	c	40.89	b	31.24		50.23
1990	35.40	a	31.70	a	43.84		54.02	c	56.30	a	64.02		75.73		73.32	a	69.03		48.91	c	41.62		23.32	a	51.43
1991	23.56		40.05		40.03	a	49.70	c	56.92		61.56	d	73.22	d	74.23		67.43	a	51.36	c	36.73	b	33.85	d	50.72
1992	32.20	c	39.21		47.69	b	51.98	b	62.53	a	71.93	b	71.42		73.11		61.87		52.15	a	36.32	b	22.88	a	51.94
1993	19.37		26.30		38.56		47.81	a	-----	z	64.20		64.98	b	68.89		64.16	a	54.18	a	33.43	a	31.27	a	46.65	a
1994	34.44		32.26	a	45.18		53.95	b	60.09	b	64.48	b	76.59	c	73.71	b	67.55	a	50.81	b	34.10	a	31.62	a	52.06
1995	29.18		37.93		42.04	c	49.78		61.10		65.21	a	73.00	a	67.66		66.00		48.92		40.02		30.22	a	50.92
1996	25.07	b	28.45		40.13		50.41	b	53.61	c	64.43	a	74.91	b	72.90	a	60.17		49.34	b	33.33		23.87		48.05
1997	26.03	b	29.36		40.62	a	47.45		59.58		63.45	b	70.82	a	74.22	a	63.95		49.78	a	38.48		30.50		49.52
1998	-----	z	38.20		43.23	a	50.60		59.78	a	-----	z	77.82		75.65	a	68.90	a	51.00		42.09	a	30.10	a	53.74	b
1999	33.66	b	36.36		41.77	a	47.68		54.57	b	63.42		69.90		74.45	b	62.52		50.27	a	42.00		34.39		50.91
2000	28.44		31.98	b	40.52	a	52.90		56.34		65.33	c	70.69	b	71.30	a	61.44	c	50.03	b	31.93	b	24.39	c	48.77
2001	26.77		27.71		40.58	a	47.95		59.71		60.19	a	70.10	a	72.47	a	64.07		48.21	b	40.17		31.21		49.09
2002	32.28	a	34.20	a	34.97	a	48.33		54.23	a	65.12	a	74.09	b	68.23	a	62.02	a	46.02	c	38.55		33.32	a	49.28
2003	32.57	a	34.41		41.38	a	49.98	b	56.57	d	69.10	d	77.02	a	72.27	e	66.88		55.45	b	34.42		28.88	b	51.58
2004	27.58	f	32.80	a	46.16	b	53.46	e	57.76	b	67.23	b	76.39		75.10	b	61.15	c	52.22	a	39.62	a	32.98	b	54.08	a
2005	26.60	b	35.52		45.26		50.84	a	60.66		65.68	b	72.40	k	74.59	b	63.36	a	54.04	f	36.10	e	24.37		48.30	b
2006	34.95	b	34.15	a	40.57	a	50.39	b	57.56		64.62	a	75.93	c	71.90		63.86	b	49.48		35.26	a	27.29	b	50.50
2007	25.08		33.79		42.93	a	48.86	a	58.50		64.46	b	77.03	a	71.89		62.75		48.83	b	35.52		28.56		49.85
2008	22.41	b	32.12		39.15		44.07	a	58.84	c	63.40	a	72.93	c	72.27	a	63.24	a	50.47		38.34	b	22.20	a	48.29
2009	22.89		28.30		36.70	a	47.24	a	58.19		67.10	a	75.58	a	73.08		66.07		46.25	a	38.87		24.03		48.69
2010	33.47	b	38.04	a	43.03		49.31	a	53.48		62.26	a	72.23		70.18	a	61.88		52.10		34.55		30.26	b	50.07
2011	31.05		29.52		40.82		44.42		53.85		62.17		68.02		73.02		66.72	a	49.84		36.03		28.39		48.65
2012	26.60		32.16		40.31		50.13		56.87		62.05		73.98		74.29		65.45	a	50.87	a	40.10		32.37		50.43
2013	24.87		33.05		42.18		49.42		58.89		65.05		76.77		73.45		65.43		48.95		36.20		24.79		49.92
2014	29.66		27.62		41.58		49.72		59.37		65.53		77.15		74.26		64.90		54.89		36.10		31.90		51.06
2015	30.02		39.57		46.58	a	49.38		62.18	a	73.47		76.63		74.37		61.57		55.47		36.35		30.29		52.99
2016	29.45		36.97		44.10		56.28		61.40		66.83		71.35		73.34		61.48		49.97		44.53		23.02		51.56
2017	20.31		26.88		40.90		47.77		58.68	a	66.17		75.66		75.58		64.40		48.13		38.86	a	26.27		49.13
2018	30.82		31.39		40.44		48.52		64.23		64.48		75.71		73.13		61.27		49.52		37.58		32.48		50.80
2019	30.32		21.95		33.73		50.13		61.42		66.75		71.03		73.74		61.77		45.42		36.78		31.13		48.68
2020	31.92		35.19		40.74		49.70		58.55		64.40		73.13		73.92		66.25		50.45		37.55		30.65		51.04
2021	33.39		30.93		42.24		51.03		58.45		73.00		79.60		73.92		63.30		50.13		39.56	c	27.55		51.92
2022	25.23	a	28.39		43.21		44.35		52.87		63.81	a	75.47		77.39	c	66.92		56.88	a	29.40	a	20.32		48.69
2023	30.98		31.43		38.12	a	46.57		65.22	a	67.67		75.16		73.81	b	63.48	a	51.63	a	37.30	b	33.94		51.28
2024	26.79		36.48	b	42.42	a	50.00	l	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	35.23	i
Period of Record Statistics
MEAN	27.05		32.51		41.13		49.83		58.51		65.64		73.21		72.13		63.82		51.00		37.44		29.27		49.98
S.D.	5.71		4.56		3.11		2.86		3.14		3.12		3.12		2.75		3.16		2.70		3.55		4.05		1.50
SKEW	-1.11		-0.78		-0.14		0.07		0.15		0.44		-0.12		-0.33		0.22		0.49		-0.96		-0.52		0.17
MAX	36.10		40.71		49.17		56.28		65.97		73.47		80.71		77.39		72.29		57.19		44.64		38.14		53.76
MIN	8.35		15.78		33.27		43.72		52.87		59.15		64.98		66.37		57.14		45.42		21.78		19.96		46.30
YRS	86		88		88		85		85		85		86		83		88		88		89		85		70