Porto Threshold Days by Year (PO000008546)

11 fixed thresholds counted per year at Porto (PO000008546): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Porto Thresholds

Porto: days with a maximum temperature at or above 30 C (86 F) in 71 years, most in 2006 with 27.
Porto: days with 10 mm (0.39 in) or more of precipitation in 71 years, most in 1960 with 72.
Porto: days with 25 mm (0.98 in) or more of precipitation in 71 years, most in 1977 with 22.
Porto: days with a maximum temperature at or above 90 F (32.2 C) in 70 years, most in 2006 with 16.
11 fixed thresholds have at least one qualifying day at Porto.

Days at or above 30 C (86 F)

71 years with a qualifying day

Days per year at Porto with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2006.

Days at or above 30 C (86 F) per year at Porto
Year	Days	Decade average
1941	21	16.8
1942	16	16.8
1943	16	16.8
1944	18	16.8
1945	12	16.8
1946	13	16.8
1947	10	16.8
1948	19	16.8
1949	26	16.8
1950	9	11.6
1951	4	11.6
1952	12	11.6
1953	23	11.6
1954	10	11.6
1955	11	11.6
1956	9	11.6
1957	16	11.6
1958	4	11.6
1959	18	11.6
1960	11	15
1961	26	15
1962	12	15
1963	14	15
1964	24	15
1965	9	15
1966	19	15
1967	6	15
1968	9	15
1969	20	15
1970	17	10.7
1971	12	10.7
1972	9	10.7
1973	9	10.7
1974	13	10.7
1975	11	10.7
1976	8	10.7
1977	4	10.7
1978	8	10.7
1979	16	10.7
1980	8	11.9
1981	20	11.9
1982	9	11.9
1983	10	11.9
1984	11	11.9
1985	15	11.9
1986	6	11.9
1987	16	11.9
1988	5	11.9
1989	19	11.9
1990	16	10.1
1991	20	10.1
1992	5	10.1
1993	11	10.1
1994	5	10.1
1995	14	10.1
1996	6	10.1
1997	10	10.1
1998	9	10.1
1999	5	10.1
2000	10	13.5
2001	13	13.5
2002	4	13.5
2003	21	13.5
2004	11	13.5
2005	20	13.5
2006	27	13.5
2007	12	13.5
2008	3	13.5
2009	14	13.5
2010	24	24
2026	18	18

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

First to last qualifying date each year at Porto
Year	First date	Last date
1941	1941-06-14	1941-10-21
1942	1942-05-31	1942-09-16
1943	1943-05-13	1943-08-28
1944	1944-06-06	1944-09-25
1945	1945-06-09	1945-09-29
1946	1946-07-06	1946-09-18
1947	1947-04-28	1947-08-25
1948	1948-06-22	1948-10-02
1949	1949-06-11	1949-09-08
1950	1950-06-26	1950-09-03
1951	1951-07-24	1951-09-19
1952	1952-06-27	1952-09-03
1953	1953-05-25	1953-09-11
1954	1954-06-16	1954-09-30
1955	1955-06-21	1955-10-12
1956	1956-05-14	1956-09-11
1957	1957-06-26	1957-09-04
1958	1958-07-08	1958-08-03
1959	1959-06-10	1959-09-21
1960	1960-06-10	1960-07-25
1961	1961-05-07	1961-09-23
1962	1962-06-20	1962-10-05
1963	1963-06-19	1963-10-10
1964	1964-05-13	1964-10-05
1965	1965-05-09	1965-08-27
1966	1966-05-20	1966-09-15
1967	1967-06-14	1967-09-09
1968	1968-05-15	1968-08-21
1969	1969-06-26	1969-09-25
1970	1970-05-25	1970-10-02
1971	1971-06-29	1971-09-30
1972	1972-07-11	1972-08-30
1973	1973-06-14	1973-08-31
1974	1974-05-20	1974-07-24
1975	1975-06-04	1975-09-21
1976	1976-06-17	1976-08-01
1977	1977-07-20	1977-09-12
1978	1978-08-23	1978-09-27
1979	1979-05-10	1979-08-20
1980	1980-06-01	1980-10-01
1981	1981-06-11	1981-09-03
1982	1982-06-15	1982-09-12
1983	1983-06-13	1983-09-05
1984	1984-06-12	1984-08-30
1985	1985-07-05	1985-10-13
1986	1986-06-12	1986-07-19
1987	1987-06-21	1987-09-17
1988	1988-06-19	1988-09-06
1989	1989-05-05	1989-10-06
1990	1990-07-06	1990-09-26
1991	1991-05-22	1991-09-13
1992	1992-05-15	1992-09-14
1993	1993-06-14	1993-08-31
1994	1994-06-05	1994-07-14
1995	1995-05-03	1995-08-27
1996	1996-06-11	1996-09-01
1997	1997-04-29	1997-09-29
1998	1998-06-17	1998-08-21
1999	1999-05-24	1999-09-09
2000	2000-06-13	2000-08-06
2001	2001-05-27	2001-09-15
2002	2002-06-24	2002-08-31
2003	2003-05-21	2003-09-13
2004	2004-06-02	2004-09-26
2005	2005-06-06	2005-09-29
2006	2006-05-25	2006-09-04
2007	2007-06-05	2007-09-10
2008	2008-06-26	2008-07-14
2009	2009-05-27	2009-10-11
2010	2010-05-19	2010-09-12
2026	2026-05-26	2026-09-13

Every Fixed Threshold

Fixed thresholds at Porto
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	71	27	2006	18
35 C (95 F): Days	45	8	1949	7
90 F (32.2 C): Days	70	16	2006	12
100 F (37.8 C): Days	10	2	2003	2
0 C (32 F): Frost days (min	56	20	1956	5
20 C (68 F): Tropical nights (min	42	13	2006	11
25 C (77 F): Days with min	1	1	2010	1
10 mm (0.39 in): Days with 10 mm or more rain	71	72	1960	3
25 mm (0.98 in): Days with 25 mm or more rain	71	22	1977	1
50 mm (1.97 in): Days with 50 mm or more rain	54	5	1989	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1953	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

Data for Porto 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Porto Threshold Days by Year (PO000008546)

Key Facts for Porto Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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