DIABLO DAM, WA

Average of Minimum Temperature (Degrees Fahrenheit)

(452157)

File last updated on April 19, 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	30.38	w	-----	z
1915	27.19		31.75		35.58		39.83		43.00	q	47.44	n	53.19	o	52.17	g	43.27	o	41.38	e	33.40		30.00		34.16	e
1916	12.73	a	27.38		31.90		36.63		39.87		45.40		50.81		51.03		45.37		36.32		30.60		24.58		36.05
1917	21.84		22.89		31.07	a	34.90		41.23		44.13		47.84		49.81		46.97		41.39		37.83		31.48		37.61
1918	30.94		27.18		30.94		34.67		40.74		46.87		51.39		51.23		46.97		43.32		33.40		29.48		38.93
1919	28.16		27.29		30.16		36.43		40.68		43.30		48.03		48.65		45.57		36.23		32.90		25.90	b	36.94
1920	25.95	j	29.78	t	31.78	m	33.79	f	37.65		45.03		51.55		51.26		45.33		40.39		33.27		31.58		42.01	d
1921	28.26		28.75		30.77		34.10		40.39		47.53		47.68		49.87		43.17		40.13		32.77		25.13		37.38
1922	22.55		22.22	a	30.84		34.57		39.58		47.10		50.77		51.58		47.20		41.94		30.72	a	25.22	d	37.02
1923	27.10		24.41	a	29.93	a	35.93		42.23		46.97		51.81		52.52		46.03	a	40.10		34.17		30.29		38.46
1924	26.81		34.96	a	31.84		36.10		43.47	a	47.23		50.55		51.81		45.93		41.23		30.86	b	25.66	b	38.87
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	50.86	p	53.23	a	49.81		45.27		41.32		35.20		28.16		42.17	f
1929	19.70	a	21.86		33.65		34.43		42.55		48.47		50.94		51.58		46.47		41.81		32.62	a	29.81		37.82
1930	15.58		31.75		33.16		39.27		41.27	a	47.70		50.27	a	50.94		48.70		38.52		32.67		30.90		38.39
1931	33.32		32.04	b	35.48		38.63		42.87		49.38	a	50.10		50.65		48.60		40.58		32.90	a	29.30	a	40.32
1932	26.45		27.31		33.77		36.72	a	39.84		46.97		48.35		49.00		-----	z	-----	z	-----	z	-----	z	38.55	d
1933	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1934	33.97		35.54		38.16		-----	z	46.58		51.07	a	52.39		54.77	a	48.37		42.20	a	38.13		31.90		43.01	a
1935	27.00	e	32.39		30.74		35.23		42.87		47.83		53.03	a	51.68		49.87		41.03		31.47		34.10		39.77
1936	30.45		16.88	d	29.90		37.63		45.03		45.00		51.90		47.87		47.97		43.19		34.21	a	30.00	a	38.34
1937	13.30	a	25.25		32.61		34.67		40.84		47.53		49.90		50.10		48.57		43.94		34.80		30.74		37.69
1938	27.37	a	28.21		32.39		37.43		43.13		48.83		53.94		51.68		52.97		41.76	b	31.73		29.89	c	39.94
1939	31.81		26.25		30.97		38.93		44.19		47.33		52.61		54.63	a	49.10		41.68		37.60		34.87		40.83
1940	31.23		33.10		35.97		41.47		46.61		50.07		54.48		54.71		54.20		44.83	a	31.10	a	32.16		42.49
1941	30.55		32.71		36.00		41.90		44.68		49.93		58.00		55.45		46.47		42.26		36.43		29.13		41.96
1942	27.03		31.14		32.13		39.73		44.39		48.03		55.77	a	57.00		50.93		41.94		32.27		30.74		40.93
1943	23.91	h	29.62	b	28.03		37.67		41.58		43.97		50.55		50.29		48.59	a	41.63	a	35.36	e	29.30	a	39.69	a
1944	27.74		28.69		30.67	a	38.03		42.16		49.52	a	52.90		52.29		46.41	a	43.58		36.40		29.61		39.83
1945	30.58		31.68		31.19		35.37		43.16		47.67		51.19		52.74		46.03		41.00		32.39	b	28.74		39.31
1946	29.77		30.21		32.94		36.53		42.74		46.17		50.45		51.68		47.97		37.33	a	28.40		28.00		38.52
1947	24.87		29.14		32.50	a	37.60		44.70	a	46.83		49.61		51.24	b	46.90		-----	z	33.79	a	31.43	a	38.97	a
1948	27.87		25.59		30.35		35.03		41.74		49.70		49.74		53.61		45.80		38.03		32.77		25.26		37.96
1949	17.19		23.07		31.39		35.33		41.77		45.30		48.48		50.52		46.80		37.13	a	37.69	a	28.23		36.91
1950	13.67	j	26.93		30.97		33.67		38.94		48.13		56.58		52.00	c	47.27		38.84		34.17		34.81		40.21	a
1951	26.55		28.44	a	26.52		34.53		42.70	a	47.90		51.19		51.74		48.47		40.87		32.90		26.13		38.16
1952	22.35		28.21		31.84		36.13		44.00		47.10		51.71		53.13		48.70		42.84		33.00		31.06		39.17
1953	32.52		31.86		33.16		37.43		43.42		47.87		51.48		50.47	a	48.40		42.42		37.37		33.32		40.81
1954	22.00		31.04	a	28.29		34.23		40.94		45.77		48.84		50.74		48.30		40.16		39.63		32.00		38.49
1955	29.58		27.50		27.38	b	33.52	a	39.13		48.40		50.19		50.00		47.83		40.87		26.80		26.29		37.29
1956	27.84		27.35	c	29.45		35.67		43.06		47.17		51.61		53.03		48.07		39.29		33.30		28.74		38.71
1957	18.00	a	26.18		32.37	a	37.83		47.35		49.63		49.23		49.84		49.10	a	40.26		34.17		33.23		38.93
1958	32.81		36.43		32.87		37.37		47.19		51.34	a	57.32		54.61		48.34	a	42.00		32.10		32.48		42.07
1959	28.06		30.75		33.90		36.90		42.58		49.87		52.71		51.16		47.93		43.20	a	31.67		32.10		40.07
1960	27.58		30.55		31.13		36.64	b	43.61		48.90		52.61		52.71		48.03		43.39		33.55	a	31.94		40.05
1961	31.94		34.21		33.74		38.60		44.65		49.52	a	53.58		55.32		45.60		38.45		31.13		30.13		40.57
1962	27.26		30.86		30.37	a	38.93	c	42.81		47.30		51.90		52.06		48.03		42.77		36.67		33.35		40.19
1963	23.65		32.89		33.45		38.80		42.45		49.67		51.94		55.06		50.90		43.13		34.00		30.87		40.57
1964	31.65		29.93	a	31.87		35.07		39.87		47.57		51.19		50.68		46.90		41.71		34.03		26.59	b	38.92
1965	29.81		31.07		29.29		37.07		41.32		47.57		-----	z	54.65		45.90		43.00		38.00	a	29.57	a	38.84	a
1966	27.77		-----	z	31.97		36.80		42.52		48.27		51.77		53.00		51.10		40.41	b	36.00		34.32		41.27	a
1967	32.23		31.89	a	32.03		35.37		42.77		50.47		52.06		53.90		50.30		42.77		36.17		29.61		40.80
1968	28.23		32.07		34.71		36.03	a	42.65		47.07		52.77		52.23	a	48.13		39.83	a	35.63		29.67	d	39.92
1969	18.90	a	27.57		31.32		36.67		43.55		52.48	a	50.63	a	51.13		49.00		40.42		37.37		33.03		39.34
1970	29.39		33.50		32.74		35.33		42.26		50.43		52.10	a	51.63	a	44.37		39.03		33.53		28.67	a	39.42
1971	26.42		31.07		30.23		34.27		41.35		45.20		49.90		53.10		43.97		39.35		35.53		26.13		38.04
1972	23.50	a	28.93		33.97		34.40		41.84		47.23		49.77	a	51.71		43.63		38.10		34.70		25.19		37.75
1973	25.03		30.96		34.32		35.50		42.55		48.23		51.19		51.13		48.57		40.74		32.37		33.97		39.55
1974	26.52		32.36		32.29		37.83		40.19		47.70		49.68		52.19		48.13		40.29		35.73		32.74		39.64
1975	28.17	a	25.46		29.97		33.00		40.26		46.83		53.39		49.65		47.41	a	41.71		32.60		30.42		38.24
1976	30.52		30.10		29.07	a	34.93		40.77		44.87		48.84		51.90		48.30		41.03		36.40		33.48		39.18
1977	26.68		33.25		33.29		37.93		41.84		47.73		49.28	b	55.30	a	47.17		39.16		30.72	a	28.84		39.27
1978	29.10		31.04		35.42		38.48	a	42.61		49.97		54.00		53.06		48.80		41.48		29.47		26.61		40.00
1979	21.16		27.71		32.58		36.73		43.52		47.10		52.42		53.52		50.17		43.48		32.10		33.71		39.52
1980	23.13		31.72		33.10		39.17	a	45.16		48.63		52.45		51.71		48.53		40.48		36.40		32.26		40.23
1981	34.42		30.82		34.29		37.33		44.52		47.00		53.29		55.10		47.80		40.00		36.63		31.13		41.03
1982	27.48		28.75		31.32		33.10		40.94		48.46	b	51.33	a	51.27	a	49.17		40.10		30.57		30.68		38.60
1983	32.50	a	33.46		35.65		36.90		45.10		49.40		51.26		52.94		45.07	a	39.90	a	37.43		22.19		40.15
1984	30.52		32.18	a	35.90		36.87		40.29		46.60		49.45	b	53.13	a	44.30		38.55		33.00		-----	z	40.07	a
1985	-----	z	26.00		-----	z	36.70		42.26		46.52	a	52.71		50.42		44.67		39.52		24.78	c	27.55	b	39.11	b
1986	32.35		28.57		35.10		37.60		42.42		49.80		50.97		54.58		47.83		41.45		34.27		30.74		40.47
1987	29.55		33.04		35.23		39.97		44.50	a	49.70		-----	z	52.19		48.97		40.74		38.67		29.10	a	40.15	a
1988	27.94		31.59		33.97		38.47		43.97		48.20		50.77		52.73	a	47.28	a	44.39		35.97	a	31.13		40.53
1989	30.26		21.43		31.32		37.67		42.94		50.63		51.90		53.23		47.80		40.74		36.70		33.68		39.86
1990	31.35		26.00		32.61		39.33		43.77		49.20		55.26		55.48		50.53		39.52		36.83		25.04	c	40.41
1991	24.94		33.82		31.23		36.73		43.47	a	48.00		52.00		54.52		48.97		39.74		36.63		33.90		40.33
1992	32.23		34.97		37.23		40.67		45.97	a	52.77		55.10		53.97		45.23		43.06		35.60		26.80	a	41.96
1993	20.26		25.93		33.42		38.13		48.18	c	49.83		52.77		53.32		47.28	a	43.23		30.90		31.35		39.55
1994	36.00		29.07	a	34.10		41.47		45.87	a	47.93		54.40	a	53.65		49.86	a	40.47	a	31.47		29.27	a	41.13
1995	29.29		31.96		32.87		37.10		45.33	a	49.67		54.68		49.90		50.76	a	40.87		36.38	a	30.35		40.76
1996	27.39		27.15	b	32.23		39.31	a	41.13		48.07	a	53.37	a	53.13		47.70		40.35		32.50		25.39		38.98
1997	28.26		30.21		-----	z	35.23		43.13		47.60		51.19		54.26		-----	z	41.74		36.33		31.58		39.95	b
1998	28.71		33.07		34.94		38.47		46.87		52.13		56.87		55.00		50.17		41.66	b	36.60		29.23		41.98
1999	32.10		31.50		33.03		34.27		38.94		47.23		50.45		52.70	a	46.17		40.16		37.30		32.86	b	39.73
2000	29.32		30.82	a	33.90	b	37.90		42.87		48.73		52.48		51.45		47.47		41.10		32.00	b	29.19		39.77
2001	31.68		28.68		34.19		36.77		42.70	a	47.93		52.42		53.87		49.07		39.90		37.00		30.35		40.38
2002	31.00		29.85	a	28.77	a	36.00		41.13		49.07		52.68		52.61		47.20		39.81		36.80		32.97		39.82
2003	32.81		31.29		33.57	a	38.97		43.19		50.83	a	53.55		53.60	a	49.27		44.29		30.60		30.84		41.07
2004	27.84		32.52		35.19		39.10		45.84		50.37		55.45		56.55		48.57		42.10	a	35.86	a	33.00		41.87
2005	27.94		29.89		34.35		38.97		47.94		50.55	a	53.00		53.68		46.93		43.71		34.20		31.48		41.05
2006	34.03		28.54		32.58		37.40		42.77		51.23		54.48		52.90		48.47		40.84		32.60		30.30	a	40.51
2007	28.42		31.93		34.16		36.77		43.03	a	48.40		53.45		51.97		48.17		40.68		33.59	a	30.61		40.10
2008	27.10		30.62		32.16		34.03		42.74		46.93		51.77		53.71		46.80		39.94		37.43		25.87		39.09
2009	27.71		28.21		28.10		34.97		41.55		50.47		55.17	b	54.06		49.67		39.87		35.87		26.77		39.37
2010	33.06		33.21		34.42		37.77		42.26		48.63		52.16		53.61		50.67		42.16		32.90		30.26		40.93
2011	29.42		27.18		32.42		33.77		41.39		48.07		49.81		51.94		49.33		42.10		31.76	a	29.29		38.87
2012	28.13		30.90		31.81		37.37		42.39		46.83		52.19		54.19		47.73		41.26		36.40		31.94		40.09
2013	27.84		32.21		33.10		37.63		44.55		50.10		53.94		56.42		52.20		39.48		34.97		27.90		40.86
2014	32.58		27.29		32.45		36.77		45.10		48.90		54.32		56.26		49.63		46.35		33.63		32.39		41.31
2015	32.39		36.18		36.61		37.47		48.29		53.23		57.35		56.19	d	47.33		45.23		33.70		31.94		42.99
2016	30.32		34.10		36.00		42.63		47.39		50.20		54.58		54.71		48.53		42.45		39.90		24.77		42.13
2017	21.65		27.25		33.52		37.57		43.61		49.10		53.55		56.13		50.37		40.00		35.43		29.84		39.83
2018	32.10		27.61		32.03		37.40		47.42		49.07		54.90		55.48		48.53		41.16		37.00		30.84		41.13
2019	31.48		21.89		29.71		39.20		46.68		50.07		53.97		55.42		51.77		38.23		34.37		32.29		40.42
2020	29.03		30.90		31.42		36.30		43.42		48.10		51.97		52.13		52.13		42.45		34.50		32.77		40.43
2021	31.32		29.29		32.10		35.77		42.94		51.27		55.87		55.26		48.43		40.83	a	36.53		28.10	b	40.64
2022	27.68		29.43		33.97		33.13		41.65		48.90		53.39		56.55		50.43		44.13		30.31	a	24.25	c	39.48
2023	31.06		29.39		29.84		35.43		48.32		50.03		54.42		56.77		50.80		43.50	a	34.70		33.77		41.50
2024	29.07	b	32.24		33.81		37.47	k	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	31.71	i
Period of Record Statistics
MEAN	27.92		29.63		32.48		36.90		43.06		48.37		52.21		52.78		48.07		41.12		34.19		29.97		39.74
S.D.	4.48		3.44		2.20		2.02		2.26		1.89		2.19		2.02		2.02		1.87		2.67		2.78		1.38
SKEW	-1.23		-0.80		-0.12		0.31		0.40		-0.06		0.30		0.07		0.15		-0.03		-0.50		-0.49		-0.22
MAX	36.00		36.43		38.16		42.63		48.32		53.23		58.00		57.00		54.20		46.35		39.90		34.87		42.99
MIN	12.73		16.88		26.52		33.00		37.65		43.30		47.68		47.87		43.17		36.23		24.78		22.19		36.05
YRS	101		103		102		102		103		103		102		104		102		103		104		103		91