Porterville Threshold Days by Year (USC00047077)

14 fixed thresholds counted per year at Porterville (USC00047077): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Porterville Thresholds

Porterville: days with a maximum temperature at or above 30 C (86 F) in 96 years, most in 1911 with 174.
Porterville: days with a maximum temperature at or above 35 C (95 F) in 96 years, most in 1936 with 103.
Porterville: days with a maximum temperature at or above 90 F (32.2 C) in 96 years, most in 1913 with 139.
Porterville: days with a maximum temperature at or above 100 F (37.8 C) in 96 years, most in 1936 with 78.
14 fixed thresholds have at least one qualifying day at Porterville.

Days at or above 30 C (86 F)

96 years with a qualifying day

Days per year at Porterville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 174 in 1911.

Days at or above 30 C (86 F) per year at Porterville
Year	Days	Decade average
1904	136	127.8
1907	111	127.8
1908	133	127.8
1909	131	127.8
1910	162	141.1
1911	174	141.1
1912	142	141.1
1913	161	141.1
1914	127	141.1
1916	118	141.1
1918	119	141.1
1919	126	141.1
1920	119	138.6
1921	145	138.6
1922	142	138.6
1923	116	138.6
1924	134	138.6
1925	120	138.6
1926	160	138.6
1927	154	138.6
1928	151	138.6
1929	145	138.6
1930	125	143.1
1931	151	143.1
1932	147	143.1
1933	148	143.1
1934	149	143.1
1935	139	143.1
1936	142	143.1
1937	141	143.1
1938	142	143.1
1939	147	143.1
1940	150	130.4
1941	117	130.4
1942	126	130.4
1943	132	130.4
1944	126	130.4
1945	127	130.4
1946	138	130.4
1947	132	130.4
1948	114	130.4
1949	142	130.4
1950	138	132
1951	141	132
1952	128	132
1953	109	132
1954	130	132
1955	126	132
1956	138	132
1957	126	132
1958	144	132
1959	140	132
1960	142	137.1
1961	139	137.1
1962	140	137.1
1963	113	137.1
1964	134	137.1
1965	140	137.1
1966	153	137.1
1967	134	137.1
1968	138	137.1
1969	138	137.1
1970	138	135.5
1971	127	135.5
1972	131	135.5
1973	147	135.5
1974	149	135.5
1975	142	135.5
1976	118	135.5
1977	126	135.5
1978	132	135.5
1979	145	135.5
1980	136	139.4
1981	138	139.4
1982	119	139.4
1983	131	139.4
1984	140	139.4
1985	136	139.4
1986	133	139.4
1987	157	139.4
1988	153	139.4
1989	151	139.4
1990	151	145.2
1991	153	145.2
1992	153	145.2
1993	140	145.2
1994	140	145.2
1995	136	145.2
1996	153	145.2
1997	163	145.2
1998	115	145.2
1999	148	145.2
2000	145	152.5
2001	165	152.5
2002	145	152.5
2003	155	152.5

For each year, a bar from the first to the last day at Porterville meeting 30 C (86 F).

First to last qualifying date each year at Porterville
Year	First date	Last date
1904	1904-04-08	1904-10-04
1907	1907-05-14	1907-10-14
1908	1908-04-10	1908-10-27
1909	1909-04-25	1909-10-27
1910	1910-03-30	1910-10-28
1911	1911-03-18	1911-11-10
1912	1912-05-07	1912-11-09
1913	1913-03-08	1913-10-28
1914	1914-03-19	1914-11-05
1916	1916-03-11	1916-09-30
1918	1918-04-19	1918-10-13
1919	1919-04-29	1919-10-17
1920	1920-01-20	1920-10-04
1921	1921-03-02	1921-11-08
1922	1922-05-02	1922-10-25
1923	1923-03-28	1923-10-14
1924	1924-04-20	1924-10-04
1925	1925-05-03	1925-10-03
1926	1926-03-23	1926-12-02
1927	1927-04-21	1927-10-25
1928	1928-03-19	1928-10-21
1929	1929-04-27	1929-10-24
1930	1930-04-06	1930-11-07
1931	1931-04-09	1931-11-07
1932	1932-03-30	1932-10-28
1933	1933-04-02	1933-10-27
1934	1934-03-20	1934-10-28
1935	1935-04-26	1935-10-28
1936	1936-04-10	1936-10-14
1937	1937-04-20	1937-10-25
1938	1938-04-19	1938-10-27
1939	1939-04-07	1939-11-01
1940	1940-04-12	1940-10-21
1941	1941-04-25	1941-10-19
1942	1942-05-05	1942-10-23
1943	1943-04-30	1943-10-16
1944	1944-04-01	1944-10-28
1945	1945-04-17	1945-11-04
1946	1946-03-09	1946-10-14
1947	1947-03-26	1947-10-05
1948	1948-04-27	1948-10-23
1949	1949-04-11	1949-11-06
1950	1950-04-18	1950-10-16
1951	1951-04-10	1951-10-10
1952	1952-04-05	1952-10-22
1953	1953-04-23	1953-10-10
1954	1954-04-16	1954-10-19
1955	1955-05-11	1955-10-26
1956	1956-04-10	1956-11-11
1957	1957-04-05	1957-10-10
1958	1958-04-21	1958-10-18
1959	1959-04-02	1959-10-26
1960	1960-03-20	1960-10-23
1961	1961-04-03	1961-10-20
1962	1962-04-07	1962-10-13
1963	1963-05-17	1963-10-15
1964	1964-04-14	1964-10-23
1965	1965-04-19	1965-11-02
1966	1966-03-31	1966-11-03
1967	1967-05-08	1967-11-04
1968	1968-03-30	1968-10-29
1969	1969-03-30	1969-11-05
1970	1970-05-02	1970-10-13
1971	1971-04-05	1971-10-15
1972	1972-03-16	1972-10-08
1973	1973-04-25	1973-10-20
1974	1974-04-09	1974-10-21
1975	1975-05-10	1975-10-21
1976	1976-05-01	1976-11-08
1977	1977-04-06	1977-10-17
1978	1978-05-04	1978-10-25
1979	1979-05-04	1979-10-12
1980	1980-04-13	1980-11-05
1981	1981-04-24	1981-10-21
1982	1982-05-01	1982-10-23
1983	1983-05-18	1983-10-29
1984	1984-04-15	1984-10-11
1985	1985-04-02	1985-10-16
1986	1986-03-28	1986-10-16
1987	1987-04-10	1987-10-20
1988	1988-03-21	1988-10-26
1989	1989-04-06	1989-10-21
1990	1990-04-04	1990-10-29
1991	1991-04-30	1991-10-22
1992	1992-04-20	1992-10-14
1993	1993-04-21	1993-11-01
1994	1994-04-13	1994-10-24
1995	1995-04-25	1995-10-30
1996	1996-04-07	1996-10-13
1997	1997-03-20	1997-11-07
1998	1998-03-24	1998-10-24
1999	1999-04-16	1999-11-03
2000	2000-04-02	2000-10-10
2001	2001-03-20	2001-10-27
2002	2002-03-31	2002-10-15
2003	2003-03-31	2003-10-30

Every Fixed Threshold

Fixed thresholds at Porterville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	96	174	1911	155
35 C (95 F): Days	96	103	1936	92
40 C (104 F): Days	94	39	1936	7
45 C (113 F): Days	8	2	1908	1
90 F (32.2 C): Days	96	139	1913	123
100 F (37.8 C): Days	96	78	1936	43
110 F (43.3 C): Days	37	9	1931	1
0 C (32 F): Ice days (max	1	1	1908	1
0 C (32 F): Frost days (min	96	55	1949	6
20 C (68 F): Tropical nights (min	96	47	1984	42
25 C (77 F): Days with min	38	6	1913	5
10 mm (0.39 in): Days with 10 mm or more rain	86	18	1940	5
25 mm (0.98 in): Days with 25 mm or more rain	65	6	1936	1
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1940	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

Data for Porterville threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Porterville Threshold Days by Year (USC00047077)

Key Facts for Porterville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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