DIABLO DAM, WA

Average of Average Temperature (Degrees Fahrenheit)

(452157)

File last updated on April 23, 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
1914	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	33.81	w	-----	z
1915	32.21		38.55		46.84		52.95		56.25	q	60.03	n	65.75	o	68.50	g	56.37	o	48.73	e	37.90		34.44		41.66	e
1916	19.28	a	34.43		39.29		47.53		51.95	b	59.90		62.56		66.03		57.97		47.85		36.00		29.05		45.99
1917	31.02		31.68		38.73	a	44.62		53.47		57.22		64.98		66.50		57.90		51.13		45.52		35.29		48.17
1918	34.26		32.30		38.53		49.95		52.58		63.03	a	66.03		62.90		63.57		50.29	b	39.73	o	32.16	l	51.35	b
1919	32.28	d	33.32	c	39.31		48.05		53.10		57.31	a	64.69		64.44		58.70		45.34		38.35		30.40	b	47.11
1920	30.90	j	37.50	t	40.33	m	44.98	f	51.11		57.88		67.02		66.71		55.72		46.77		39.37		35.53		52.51	d
1921	32.76		35.75		40.40		44.23		54.35		60.02		62.11		63.84	b	53.85		49.58		37.90	a	30.24		47.09
1922	27.74		29.63	a	37.68		44.52	b	53.27	a	63.63		66.32		64.79		58.68		50.35		36.45	a	29.00	d	46.84
1923	31.39		32.04	a	38.50	a	47.93		53.83	a	59.30		66.31		66.50	a	59.70	b	49.62	a	40.20	b	33.76		48.26
1924	31.08		40.54	a	41.89		46.82		58.62	a	60.70		64.93	a	64.85		59.18		48.47		35.76	e	29.13	e	48.50
1925	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1926	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1927	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1928	-----	z	-----	z	-----	z	-----	z	-----	z	62.43	p	66.75	a	64.21		58.30		48.08		39.87		32.34		51.59	f
1929	23.92	a	29.04		40.82		44.87		54.24		58.73		64.15		64.48	b	59.30		50.68		37.66	a	32.97	b	46.74
1930	20.05	a	36.46		42.84		50.87		53.02	b	59.12		64.84	b	66.39		58.75		47.65		37.93		34.85		47.73
1931	37.15		38.06	c	42.40		49.93		56.05		59.69	a	65.16		65.15		56.70		49.29		37.38	a	-----	z	50.63	a
1932	30.46	e	33.48	a	41.03		48.19	a	53.44		-----	z	63.62	o	62.74		-----	z	-----	z	-----	z	-----	z	44.89	f
1933	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1934	37.58	a	41.00		45.58		-----	z	56.00		60.89	b	61.94		66.12	a	55.82		49.33	a	41.77		35.13		50.10	a
1935	32.41	h	39.04		37.19		45.48		54.98	a	59.56	f	64.93	c	63.15		60.52	d	46.91	c	35.63		36.73		48.46	b
1936	33.61		22.90	d	34.73		47.95	a	55.87		57.87		63.63		62.98		58.50		52.87		40.66	a	34.13	a	47.14
1937	20.12	a	29.94	c	41.80	a	43.03		54.15		60.12		64.71		63.19		59.87		52.42		40.13		35.63		47.09
1938	31.80	a	33.91		39.06		45.88		54.26		60.97	a	67.31		63.69		64.62		49.45	b	36.52		34.43	c	48.49
1939	34.89		31.98	a	39.02		49.07		55.94		58.02		66.21		68.63	a	60.73		48.65		42.97		39.42		49.63
1940	35.34		38.10		43.69		49.33		56.65		61.37		64.58		65.48		63.92		51.58	a	36.60	a	36.68		50.28
1941	34.40		40.30		46.77		52.08		53.27		58.30		70.15		65.44		53.88		49.16		42.47	a	34.47		50.06
1942	33.48		37.64		40.23		50.28		52.66		56.25		67.55	a	68.40		62.18		51.69		37.60		35.60		49.46
1943	32.41	o	-----	z	40.38	s	48.10	a	50.11		57.57	a	63.18		62.32		61.97	a	52.67	a	42.38	f	33.84	b	53.72	d
1944	33.35		36.07		38.87	a	48.22		53.81		59.93	a	65.23		63.31		59.64	a	53.29		41.82		34.50	a	49.00
1945	35.82		37.84		39.05		43.22		55.74		57.98		65.23		66.02		56.60	a	50.23		37.22	c	33.58	a	48.21
1946	34.70	a	35.89		40.98		45.37		55.95		56.50		63.45		64.87		58.57		45.28	a	34.87		33.19		47.47
1947	30.52		37.75		43.50	a	49.07		56.73	a	57.42		62.31		62.86	b	58.63		-----	z	39.36	a	36.18	a	48.58	a
1948	33.77		32.95	a	38.97		43.95		51.68		61.64	a	61.68		61.98		57.45		48.27		38.28	a	30.05		46.72
1949	25.08		30.73		40.63		47.80		55.92		57.48		61.42		63.18		59.90		45.45	a	44.52	a	33.21		47.11
1950	21.05	j	32.91		37.73		43.34	a	49.92		60.05		67.39		65.75	c	60.58		46.29		39.80		39.29		49.37	a
1951	31.47		35.07	a	34.84		49.85		54.02	a	62.32		66.24		65.11		61.97		48.05		39.17		30.66		48.23
1952	27.65		35.79		39.76		48.13		56.29		57.30		65.89		65.56		62.25		55.58		40.68		35.68		49.21
1953	39.32		39.45		41.34		47.28		55.44		56.98		66.63		63.37	a	60.02		51.65		43.18		37.40	g	51.33	a
1954	-----	z	37.74	a	38.65		42.15		53.68		55.47		61.08		60.48		58.17		48.13		45.33		36.23		48.83	a
1955	34.13		33.54		34.50	b	42.79	a	48.22	a	58.65		60.06		64.60		58.85		48.65		33.23		31.63		45.74
1956	32.29		33.10	c	36.66		48.88		57.69		56.18		65.76		65.65		59.28		45.84		39.45		34.44		47.93
1957	24.22	a	33.32		40.38	a	48.55		59.63		60.75		61.50		62.10		64.16	a	49.65		40.58		37.92		48.56
1958	37.31		41.93		42.65		48.12		61.74		64.48	a	72.95		69.03		57.79	a	51.45		37.42		36.95		51.82
1959	32.90		35.79		40.26		46.78		52.69		60.03		66.58		62.27		56.03		50.30	a	38.55		36.18		48.20
1960	32.21		37.10		39.98		45.95	b	52.24		59.15		68.47		62.34		59.08		51.53		39.28	a	36.35		48.64
1961	38.05		38.95		36.96	s	46.44	e	54.31		63.12	a	66.63		70.16		56.65		46.48		36.95		34.11		50.17	a
1962	32.92		38.27		38.45	a	49.46	c	50.66		59.17		63.58		62.29		59.82		50.61		42.60		37.52		48.78
1963	29.34		40.89		41.31		47.00		55.23		58.55		61.56		66.35		62.73		50.74		39.12		35.82		49.05
1964	36.00		37.41	a	38.79		43.57		50.81		57.65		63.06		61.03		56.70		50.61		39.33		31.50	b	47.21
1965	33.94		36.61		40.85		47.95		52.26		59.85		-----	z	65.73		57.90		51.90		43.41	a	34.63	a	47.73	a
1966	32.87		-----	z	40.52		47.72		55.16		58.45		62.79		65.13		61.30		48.62	b	41.37		37.84		50.16	a
1967	36.03		38.30	a	39.00		45.22		53.37		62.95		64.37		70.05	b	63.63		49.26		42.27		34.00		49.87
1968	32.84		40.43		42.52		44.64	a	54.48		58.18		65.76		62.82	a	59.15		46.53	a	41.07		33.96	d	48.53
1969	23.15	a	34.50		41.84		46.23		57.37		64.59	a	62.92	a	62.34		58.03		49.21		42.80		37.05		48.34
1970	33.27		41.34		42.19		43.22		53.92		64.08		65.12	a	65.15	a	55.03		48.11		39.58		32.52	a	48.63
1971	31.37		36.61		36.94		44.82		54.58		54.93		64.53		68.02		55.28		47.26		39.67		30.40		47.03
1972	29.13	a	35.33		40.71		43.07		54.56		57.53		63.02	a	66.13		54.43		48.90		40.58		29.82		46.94
1973	30.58		38.39		42.21		46.82		54.97		58.70		64.74		62.92		60.17		47.66		36.57		38.11		48.49
1974	31.73		37.39		39.35		46.42		49.42		60.63		62.56		66.84		63.25		51.29		40.85		37.42		48.93
1975	33.42	a	31.24	e	37.31		42.15		50.87		55.05		66.60	f	60.35	e	62.07	a	48.35		37.55		35.35		44.88	a
1976	35.42		36.53		37.13	a	46.38		53.48		56.33		61.63		61.06		61.22		50.74		42.92		38.32		48.43
1977	33.03		41.14		39.79		50.00		51.92		61.20		61.48	b	69.22	a	57.15		48.48		33.47	m	33.85		49.75	a
1978	33.77		37.84		43.87		47.25	b	52.69		63.05		65.98		64.42		55.65		51.24		35.65		31.19		48.55
1979	26.89		33.89		43.08		46.40		55.37		59.92		65.71		66.00		61.20		52.47		39.03		37.85		48.98
1980	28.56		38.05		39.74		51.02	a	54.85		57.73		64.47		62.55		58.17		51.19		41.30		36.42		48.67
1981	39.31		38.14		44.90		45.62		54.31		55.68		63.29		69.18		59.00		48.32		42.27		35.24		49.60
1982	31.85		34.32		40.65		43.58		52.35		61.55	b	61.55	a	63.15	a	59.33		48.68		35.65		35.19		47.32
1983	37.73	a	39.66		44.37		48.67		57.69		58.47		60.90		64.81		55.66	a	48.37	a	41.62		27.13		48.76
1984	36.29		38.23	a	44.03		45.62		49.19		57.03		63.84	b	65.00	a	55.37		46.19		37.68		-----	z	48.95	a
1985	-----	z	32.55		-----	z	45.93		53.87		58.98	a	69.37		63.74		55.35		46.26		29.98	c	32.12	b	48.82	b
1986	37.69		34.95		44.06		45.35		53.44		62.87		61.11		69.85		57.55		52.02		38.87		34.71		49.37
1987	33.82		39.29		43.03		51.08		55.95	a	62.23		-----	z	65.77		62.40		53.52		43.72		33.50	a	49.48	a
1988	32.65		38.22		41.32		48.65		53.95		59.52		64.08		64.75	a	59.26	a	53.53	a	40.03	a	35.63		49.30
1989	34.48		28.68		38.55		49.65		52.87		62.62		63.15		63.39		62.38		49.52		41.12		38.00		48.70
1990	36.00		32.52		42.40		50.13		53.21		58.80		68.47		67.56		63.12		45.89		41.77		29.46	c	49.11
1991	30.56		40.34		39.24		47.30		52.42	a	57.00		64.56		66.19		61.83		50.06		41.10		37.74		49.03
1992	36.65		41.64		49.42		50.58		58.90	a	64.28		65.13		66.98		55.28		50.39		40.13		31.12	a	50.88
1993	25.23		33.95		42.76		46.17		59.50	c	58.37		60.00		64.50		61.17	a	52.40		36.15		35.44		47.97
1994	40.27		34.06	a	43.39		50.67		57.10	a	58.33		67.33	a	65.79		62.24	a	48.82	a	35.20		33.15	a	49.70
1995	33.82		38.34		41.48		47.75		58.45	a	60.88		66.39		60.29		64.33	a	47.15		41.79	a	34.82		49.62
1996	31.73		34.57	b	40.84		47.81	a	49.48		58.97	a	68.18	a	65.94		56.45		47.56		36.92		29.02		47.29
1997	32.33	a	36.70		-----	z	45.37		55.10		57.47		62.61		67.26		-----	z	47.97		42.55		35.56		48.29	b
1998	32.97		39.52		42.56		48.98		55.97		61.70		68.71		67.65		63.83		50.41	b	41.22		33.10		50.55
1999	36.31		36.21		39.60		45.72		50.00		55.92		62.79		64.90	a	58.70		48.87		41.78		36.62	b	48.12
2000	33.61		37.39	a	40.97	b	49.10		52.00		59.82		63.11		63.60		57.67		49.39		37.45	b	33.73		48.15
2001	36.44		35.70		42.29		46.02		53.87	a	57.57		64.05		65.52		59.90		47.06		41.68		33.90		48.67
2002	34.85		35.65	a	35.67	a	45.27		51.15		61.25		65.42		65.40		58.82		49.37		42.63		36.77		48.52
2003	37.58		38.66		39.88	a	46.80		53.42		62.59	a	67.77		67.33	a	61.67		52.13		36.38		35.03		49.94
2004	32.18		39.24		43.45		51.72		55.76		62.67		68.55		67.94		56.90		50.32	a	40.96	b	37.15		50.57
2005	32.82		38.70		43.66		49.73		58.65		58.33	a	64.97		67.37		57.85		50.31		38.73		35.42		49.71
2006	37.68		35.23		40.68		47.90		54.56		62.03		67.37		65.71		61.18		49.97		37.45		34.48	a	49.52
2007	33.19		37.89		41.02		45.87		55.00	a	58.47		66.31		63.66		58.85		47.27		39.22	a	34.22	a	48.41
2008	31.35		36.60		38.74		42.35		53.74		56.88		64.31		65.08		58.53		48.10		42.70		30.26		47.39
2009	32.58		35.50		35.55		45.73		53.76		62.02		68.91	b	65.44		60.95		47.50		40.08		30.30	a	48.19
2010	37.66		40.50		43.24		46.67		51.94		58.00		65.52		65.94		58.83		50.87		37.30		33.89		49.20
2011	33.82		33.14		39.21		41.43		50.37		57.28		60.71		64.89		62.18		48.50		36.48	a	34.31		46.86
2012	33.03		37.02		37.90		47.52		53.60		55.35		64.11		68.05		61.80		49.95		40.87		35.16		48.70
2013	32.37		37.45		41.66		46.52		56.06		60.45		68.27		67.63		61.83		49.05		39.78		32.60		49.47
2014	37.61		32.25		39.18		46.55		56.11		59.57		67.81		68.71		61.45		52.95		39.30		36.44		49.83
2015	37.44		43.14		46.11		47.90		59.66		67.12		70.23		68.85	d	57.37		53.68		38.68		35.16		52.11
2016	34.16		40.53		43.71		54.28		58.10		62.02		64.50		68.07	a	58.73		49.10		44.07		29.00		50.52
2017	27.35		33.30		39.18		46.30		55.71		60.77		67.35		70.73		62.73		48.50		40.00		33.77		48.81
2018	35.76		33.09		39.48		47.17		60.23		59.65		69.29		68.13		58.45		50.18		42.08		34.84		49.86
2019	36.29		28.57		41.44		48.52		58.89		61.13		64.73		67.53		59.68		46.16		40.55		35.45		49.08
2020	32.90		36.79		39.89		47.48		55.85	a	58.03		64.44		65.76		63.22		50.45		39.48		36.66		49.25
2021	36.26		33.55		40.71		48.75		54.45		65.58		69.18		66.55		58.68		47.50	a	41.93	c	32.62	b	49.65
2022	32.71		36.14		41.71		42.72		49.94		59.72		67.89		71.02		63.77		53.60		36.14	a	28.77	c	48.68
2023	35.55		35.04		39.27		44.57		61.81		62.03		68.34		69.68		61.45		52.77	a	40.72		37.53		50.73
2024	33.33	b	38.78		42.19		47.65	g	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	38.10	i
Period of Record Statistics
MEAN	32.83		36.10		40.70		47.04		54.40		59.61		65.06		65.40		59.46		49.50		39.55		34.22		48.66
S.D.	4.09		3.45		2.67		2.55		2.75		2.50		2.56		2.40		2.61		2.17		2.70		2.68		1.23
SKEW	-1.20		-0.69		0.27		0.10		0.32		0.46		0.26		0.13		-0.02		0.23		-0.38		-0.51		0.15
MAX	40.27		43.14		49.42		54.28		61.81		67.12		72.95		71.02		64.62		55.58		45.52		39.42		52.11
MIN	19.28		22.90		34.50		41.43		48.22		54.93		60.00		60.29		53.85		45.28		29.98		27.13		45.74
YRS	99		102		100		102		103		101		100		104		102		103		101		100		83