PORTOLA, CA

Average of Minimum Temperature (Degrees Fahrenheit)

(047085)

File last updated on April 25, 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
1915	17.03		21.82		25.81		29.40		32.48		31.97		37.74		34.48		28.17		22.26		19.97		-----	z	27.38	a
1916	14.74		21.10		25.68		39.43		30.81		34.77		46.31	e	33.06		29.07		25.71		17.83		11.13		27.47
1917	3.32		14.61		14.71		29.53		34.10		32.77		50.00		61.44	d	34.20		-----	z	21.43		17.16		28.48	a
1918	16.00		13.96		15.45		25.57		28.39		38.47		40.00		33.23		31.13		27.77		19.53		7.77		24.77
1919	12.87		18.68		18.74		22.87		31.48		31.13		37.77		33.39		29.33		18.42		13.30		11.61		23.30
1920	16.39		22.28		23.45		24.90		23.61		32.70		33.23		40.61		28.93		21.42		-----	z	11.71		25.38	a
1921	15.29		-----	z	28.94		23.53		-----	z	37.50		33.53	a	31.55		-----	z	25.94		21.17		21.90		26.59	c
1922	5.87		13.11		16.39		18.77		28.03		35.23		39.55		33.71		31.30		26.16		19.80		22.42		24.19
1923	12.52		-----	z	21.13		26.83		30.29		33.00		38.03		35.10		35.77		26.94		19.83		14.35		26.71	a
1924	6.52		21.72		19.16		23.60		27.19		34.73		37.06		31.74		29.70		29.39		21.66	a	15.16		24.80
1925	18.87		26.85	a	23.29		27.40		33.58		39.79	a	41.58		34.58		29.53		23.61		21.27		19.40	a	28.31
1926	17.13		22.46		22.90		32.67		-----	z	36.53		47.72	b	-----	z	-----	z	-----	z	29.57		20.10		28.64	d
1927	16.70	a	20.36		22.03		21.60		26.45		33.20		39.45		33.06		27.56	c	25.32		28.43		12.07	a	25.52
1928	15.90		13.66		27.42		23.23		40.06		33.20		37.03		30.61		24.97		15.55		19.07		9.77		24.21
1929	8.94	m	18.62	l	22.00		26.07		29.58		36.50		36.00		-----	z	27.40		19.71		10.54	d	16.39		24.91	c
1930	8.87		20.04		22.16		24.20		30.26		37.53		37.61		35.06		33.43		23.29		18.43		15.84		25.56
1931	14.84		19.96		27.26		29.60		37.93	b	36.13		42.53	a	37.35		30.20		23.74		20.67		24.75	c	28.75
1932	19.63	a	21.76		27.68		29.80		40.48		50.63		-----	z	39.97		30.63		23.10		-----	z	7.06		29.07	b
1933	6.84		6.68		21.61		22.67		27.42		37.53		38.97		36.00		29.97		34.29		19.60		18.03		24.97
1934	20.61		24.64		25.55		26.30		31.35		35.03		34.61		-----	z	-----	z	32.00	a	25.62	a	20.67	a	27.64	b
1935	-----	z	20.93		17.35		29.03	a	30.48		34.77		36.23		34.77		31.03		25.93	c	20.90	i	15.74		27.63	b
1936	20.73	a	20.20	d	22.16		28.13		31.11	d	37.43		38.39		35.55		-----	z	21.19		15.47		15.23		25.96	a
1937	3.20	k	17.50		25.10	a	25.93		30.48		35.73		39.06		34.77		29.77		26.45		24.90		19.70	a	28.13	a
1938	20.42		16.48	a	21.32		28.03		30.77	a	39.33		39.42		34.32		31.43		28.55		17.80		18.81		27.22
1939	17.97	a	10.82		24.47	a	27.10		30.84		32.43		38.42		36.13		32.37		25.87		17.93		23.65		26.50
1940	22.48		24.10		26.13		28.83		33.61		38.27		34.87		34.42		31.77		28.61		21.73		19.86	b	28.72
1941	21.16		23.70	a	22.23		23.83		32.90	a	34.17		38.74		36.42		27.67		25.13		22.10		20.23		27.36
1942	15.68	c	13.43		19.23		27.13		30.32		34.03		37.61		34.87		32.30		32.45		27.53		21.06		27.14
1943	20.29		22.39		22.23		-----	z	31.13		32.30		39.06		29.16		30.87		27.45		21.60		18.77		26.84	a
1944	17.73	a	20.10		17.45		23.93		29.65		33.37		35.97		33.23	a	32.33		27.39		23.43		22.71		26.44
1945	16.70	a	19.61		21.10	a	22.70		31.84		35.60		-----	z	-----	z	-----	z	32.90		25.47		21.39		25.26	c
1946	17.50	a	15.71		23.32		26.73		29.77		30.67		39.29		35.74		30.63		23.74		23.03		22.47	a	26.55
1947	13.39		23.14		24.55		28.17		34.48		38.13		33.81		36.00		31.00		31.13		20.47		15.77		27.50
1948	19.84		16.29	a	19.48		27.63		30.35		37.90		37.61		33.48		31.53		25.71		22.90		11.39		26.18
1949	1.42		9.79		24.65		27.53		34.17	a	37.60		38.16		39.77	a	37.57		26.33	g	23.37		11.23		25.93	a
1950	8.81		18.89		23.94		27.57		30.61		35.67		40.19		37.74		34.80		31.10		31.13		27.13		28.96
1951	18.77		22.79		22.06		28.83		32.97		36.83		38.39		36.87		33.88	d	24.10	b	23.33		16.77		27.97
1952	10.94		16.17		16.71		27.87		32.42		36.10		44.74		37.42		35.53		27.61		16.77		19.90		26.85
1953	24.10		18.04	a	20.94		25.33		30.29		34.20		39.35		37.45		37.00		27.52		27.07		21.19		28.54
1954	21.65		21.86		22.81		29.53		32.94		37.17		41.19		36.26		30.03		26.29		24.27		20.87		28.74
1955	9.16		13.64		18.93	a	23.90		31.84		36.93		38.97		36.35		32.47		27.19		23.07		24.97		26.45
1956	20.65		11.07		20.71		28.67		34.84		36.73		42.26		36.23	a	34.80		30.43	a	20.07		15.84		27.69
1957	6.77		22.14		27.13		27.53		35.16		38.60		39.52		32.84		36.50		31.26		23.63		19.71		28.40
1958	20.52		27.50		22.61		26.47		34.26		39.13		41.94		45.48		-----	z	29.61		22.67		21.87		30.19	a
1959	24.75	c	19.50		24.39		26.33		31.84		38.37		43.32		37.35		34.57		29.13		15.17		11.42		28.01
1960	17.11	c	20.38	e	27.13		27.17		30.00		37.38	d	41.58		34.90		30.93		25.77		22.21	f	17.29		28.15	a
1961	16.03		21.29		22.90		22.40		27.48		36.82	b	36.03		41.56	d	31.00		26.72	f	21.52	a	19.61		26.97	a
1962	14.19		19.11		19.03		28.10		32.29		35.70		39.35		37.23		34.23		30.61		25.77		22.55		28.18
1963	15.03		29.68		22.39		26.00		37.26		38.40		36.55		36.13		39.40		31.77		27.50		21.68		30.15
1964	18.00		12.97		20.23		23.97		31.19		36.70		39.45		-----	z	30.30		29.03		22.30		27.97		26.55	a
1965	20.45		19.36		24.13		32.07		30.81		38.10		40.81		41.65		31.23		26.68		24.60		13.70	a	28.63
1966	13.03		15.43		23.81		27.70		35.26		35.63		36.32		41.90		35.30		27.13		26.10		21.19		28.23
1967	19.03		21.11		24.19		24.53		32.52		39.07		41.84		44.03	a	39.43		28.27	a	27.43		13.03		29.54
1968	-----	z	25.00		24.71		25.57		30.68		37.93		43.58		40.42		33.33		28.32		26.30		15.94		30.16	a
1969	18.74		16.11		18.84		27.17		35.65		42.47		42.39		37.19		36.33		26.74		22.37		22.48		28.87
1970	25.84		23.79		25.32		24.90		31.45		37.67		38.97		35.19		29.84	e	24.77	i	30.13		18.83	g	30.31	b
1971	13.52		16.14		19.60	p	28.04	e	31.04	d	-----	z	39.67	a	36.81	d	28.53		25.47	l	20.23	q	13.50	m	27.68	e
1972	10.19	e	21.90	i	27.44	f	24.85	c	31.36	c	39.14	h	38.93	d	38.63	d	31.88	d	30.86	j	24.29	m	9.00	y	29.31	f
1973	18.82	n	26.11	j	-----	z	28.33	o	31.95	i	35.06	n	37.24	n	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z
1974	-----	z	17.65	h	25.26		24.89	c	30.04	d	34.60		39.74		37.74		31.93		-----	z	-----	z	14.25	s	32.03	e
1975	16.61	c	20.62	b	25.68	c	21.33	c	29.54	g	36.69	d	39.63	a	36.38	b	39.33	c	29.94		21.32	e	20.81	d	28.03	a
1976	18.26	d	21.08	d	18.85	d	23.92	f	26.65	e	30.00	b	36.07	b	34.50	e	38.47		27.79	b	24.00	b	13.83	a	26.32	a
1977	14.31	b	20.92	c	21.52	h	25.44	c	29.62	b	42.88	e	40.82	c	41.56	d	34.72	e	29.20	k	23.23	d	26.44	v	30.39	c
1978	24.41	i	23.92	c	31.63	d	29.59	a	32.73	a	37.26	c	42.94		41.68	c	35.25	b	29.37	a	23.19	c	12.28	m	32.75	b
1979	17.45	b	19.28	c	25.93	c	27.57		33.86	b	34.24	a	41.50	a	39.77		37.72	a	33.69	b	24.14	a	19.86	b	29.58
1980	23.71		27.59	b	24.00	a	29.63		32.89	d	34.61	b	42.33	d	38.13	a	36.19	c	30.87		24.30	j	23.37	d	31.21	a
1981	24.68	c	22.96		27.36	c	27.82	b	-----	z	41.00	a	38.73	a	41.35	e	-----	z	-----	z	30.65	g	29.11	d	31.63	d
1982	15.70	h	23.58	b	27.18	c	25.78	c	31.62	b	38.63		41.40	a	41.43	a	36.93	c	27.25	k	24.69	d	20.33	d	31.16	b
1983	22.43	h	26.70	a	29.57	a	26.96	c	33.00	b	36.28	e	36.26		42.17	b	38.61	b	33.48	b	28.17	a	28.31	b	32.68	a
1984	21.89	d	-----	z	28.14	q	28.47		36.32		36.37	c	46.57	a	41.97		37.93		30.16		27.32	b	17.48		32.45	b
1985	20.10	a	16.71		19.84		30.04	f	31.60	a	40.13		44.45	b	39.00		35.07		28.35		17.54	b	21.21	c	28.55	a
1986	28.32		27.22	a	29.71		30.13		34.39		41.60		43.32		43.35		35.52	a	30.74		24.47		21.29		32.51
1987	15.68		22.46		25.94		30.53		37.10		40.80		40.77	a	42.35		36.17		33.13		27.40		21.19		31.13
1988	17.35		20.03		23.93	a	32.17		31.21	b	40.50		46.87		45.16		36.77		31.74		28.00	a	18.23		31.00
1989	13.29		15.79		29.84		31.53		34.81		41.90		40.71		40.03		36.23		30.58		22.70		19.45		29.74
1990	19.10		12.64		24.72	b	33.10		35.58		36.93		45.07	d	44.14	b	36.43		28.53	a	19.34	a	6.97		28.55
1991	14.63	a	22.63	a	23.00	a	29.03	a	31.90	b	35.93	c	44.48	b	43.81	d	38.59	a	31.63	a	24.76	a	18.72	b	29.93
1992	17.42		27.18	a	26.86	b	30.50	b	37.42	e	42.66	a	44.44	d	44.72	b	36.93	b	32.18	c	23.82	b	12.15	d	31.36
1993	9.45	b	18.50	b	27.84		29.52	e	36.71		38.90		41.90	a	40.37	a	34.61	b	32.87	a	21.00	a	18.84		29.21
1994	20.77		16.92	b	26.26		28.63		35.53	a	36.89	c	45.39		39.29		35.87		26.58		19.03		18.24	b	29.12
1995	25.21	b	23.21		24.35		27.48	a	35.57	a	39.83	a	42.62	b	39.04	e	35.82	b	28.86	b	25.03	a	24.55	b	30.97
1996	21.50	c	24.03		24.23	a	29.43		35.07	b	40.93	c	44.43	h	42.29	c	34.07	b	30.04	c	26.52	a	24.64	c	30.25	a
1997	20.71	c	22.44	a	26.74		29.76	a	36.77		40.73		43.29		42.23	a	38.03		26.90	b	27.90	a	17.00	d	31.04
1998	22.20	a	23.82		26.10	b	29.33		32.77	a	39.57		43.85	d	41.33	d	40.07	b	28.06		25.25	f	14.67	a	31.07	a
1999	19.68	c	21.29		23.79	b	26.10		32.32		38.88	e	-----	z	42.30	a	37.07	a	28.87	a	25.93	a	18.19		28.58	a
2000	22.97	b	26.37	b	25.84		30.00	b	35.23		41.57		40.07	a	42.10		36.12	e	29.73	a	19.40		21.65		30.92
2001	16.13		17.56	a	27.38	b	25.24	a	37.68		40.90		43.80	a	42.42		39.63	k	31.23		26.59	a	20.55		29.95	a
2002	15.87		20.57		23.19		30.20		32.73	a	40.27		46.10		40.90		36.53		25.93	b	23.40		20.83	a	29.71
2003	25.63	a	20.50		26.23		28.07		35.10		40.37	c	46.10		43.81		38.67		29.90	b	22.29	b	23.67	a	31.69
2004	17.87	a	21.96	b	28.07	a	29.46	b	34.00		39.52	a	44.58		43.68		35.18	b	29.07	d	22.76	a	19.97	b	30.51
2005	16.37	d	24.11		26.50	a	29.40		37.35		38.13		47.55		42.71		34.68	b	30.64	c	25.11	b	23.68	i	32.05	a
2006	22.03	a	19.40	c	20.03	b	30.78	c	35.87	a	41.14	a	45.86	b	39.03	a	35.50		27.71		26.15	d	19.97	b	30.29
2007	13.86	b	22.41	a	24.50	a	28.73		34.40	a	39.20		45.77		41.94		36.03	a	31.19		23.00		18.56	d	29.97
2008	16.07	a	14.50	a	22.62	b	25.79	a	35.60	a	38.30		43.35		44.67	a	36.50		29.27	a	27.61	b	14.00	c	29.02
2009	19.82	c	21.58	b	24.34	b	27.73		36.81		40.79	a	44.45		43.61		39.36	b	28.60	a	24.19	c	13.44	d	30.39
2010	23.56	d	23.22	a	24.00	a	27.03		29.90	a	40.63		45.19		40.34	b	35.48	a	34.96	d	22.22	c	23.56	d	30.84
2011	19.21	c	17.54	b	25.58		28.45	a	32.10		39.77		42.93	a	40.80	a	39.48	a	29.22	v	21.79	b	15.78	d	29.40	a
2012	18.77		21.62		25.55	b	29.90	a	34.24	j	38.40	o	42.90		44.47	a	38.80		31.73	a	27.70		20.71		30.22	b
2013	9.29		17.64		26.10	a	31.03		35.48		42.13		46.67	a	42.19		39.67		26.00		23.30		10.52		29.17
2014	19.16		25.96		27.87	a	28.63		34.26		39.60		49.80	a	45.23		39.50		31.10		25.90		27.26		32.86
2015	21.87		26.36		27.29		26.60		35.77		43.53		46.65		43.81		37.77		34.13		20.97		20.55		32.11
2016	24.10		23.59		29.03		32.30		37.48		40.03		41.52		43.00		35.87		32.10		26.43	b	19.13		32.05
2017	18.64	c	25.32		26.68		29.69	a	36.45		43.33		45.23		47.71		39.53		25.32		26.31	a	17.94		31.85
2018	21.32		16.43		21.77	a	30.80		37.17	b	39.14	a	48.55		41.48	d	34.03		31.48	j	23.48	c	21.93	d	30.55	a
2019	21.36	c	10.36	q	24.96	e	32.86	a	35.31	b	41.52	a	43.43	a	43.55	b	36.19	d	25.72	b	24.17	g	22.50	a	32.74	b
2020	23.25	c	21.25	a	21.32		30.40		35.42		39.85	d	44.27	a	45.94		39.83		30.03	a	20.79	a	19.53	a	30.99
2021	21.03		20.40	c	22.74		26.62	a	33.21	b	44.34	a	49.26		44.75	c	37.55	a	30.83	b	25.93		23.25	o	32.42	a
2022	-----	z	-----	z	-----	z	-----	z	-----	z	41.14	p	45.32		45.83	a	41.33		29.16		18.82	b	13.17	g	36.09	g
2023	15.86	b	14.29		19.48		28.70		38.03		41.79	b	46.19	d	45.03	a	37.97		31.83	a	24.72	a	22.21	c	30.51
2024	23.07	a	24.34		25.96	c	27.36	h	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	-----	z	24.46	i
Period of Record Statistics
MEAN	17.42		20.18		23.76		27.60		32.94		37.79		41.34		39.30		34.39		28.28		23.04		18.71		28.69
S.D.	5.13		4.38		3.36		2.97		3.10		3.32		3.83		4.69		3.62		3.55		3.68		4.67		2.25
SKEW	-0.74		-0.49		-0.40		0.19		-0.12		0.30		0.11		0.83		-0.29		-0.81		-0.53		-0.37		-0.36
MAX	28.32		29.68		31.63		39.43		40.48		50.63		50.00		61.44		41.33		34.96		31.13		29.11		32.86
MIN	1.42		6.68		14.71		18.77		23.61		30.00		33.23		29.16		24.97		15.55		10.54		6.97		23.30
YRS	100		101		104		104		102		104		104		103		100		95		97		98		63