Arneiroz Threshold Days by Year (BR000640003)

4 fixed thresholds counted per year at Arneiroz (BR000640003): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arneiroz Thresholds

Arneiroz: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1985 with 40.
Arneiroz: days with 25 mm (0.98 in) or more of precipitation in 63 years, most in 1924 with 19.
Arneiroz: days with 50 mm (1.97 in) or more of precipitation in 46 years, most in 1988 with 5.
Arneiroz: days with 100 mm (3.94 in) or more of precipitation in 3 years, most in 1966 with 1.
4 fixed thresholds have at least one qualifying day at Arneiroz.

Days with 10 mm (0.39 in) or more of precipitation

64 years with a qualifying day

Days per year at Arneiroz with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1985.

Days with 10 mm (0.39 in) or more of precipitation per year at Arneiroz
Year	Days	Decade average
1911	15	18.8
1912	26	18.8
1913	27	18.8
1914	20	18.8
1915	10	18.8
1916	19	18.8
1917	28	18.8
1918	19	18.8
1919	5	18.8
1920	21	22.7
1921	24	22.7
1922	25	22.7
1923	19	22.7
1924	37	22.7
1925	22	22.7
1926	18	22.7
1927	12	22.7
1928	26	22.7
1929	23	22.7
1930	19	16
1931	13	16
1948	20	17
1949	14	17
1950	26	14
1951	7	14
1953	15	14
1954	10	14
1955	20	14
1956	12	14
1958	4	14
1959	18	14
1960	15	22
1961	20	22
1962	25	22
1963	18	22
1964	31	22
1965	23	22
1966	19	22
1967	22	22
1968	21	22
1969	26	22
1972	10	15
1978	19	15
1979	16	15
1980	17	22.7
1982	13	22.7
1983	13	22.7
1984	27	22.7
1985	40	22.7
1986	25	22.7
1987	19	22.7
1988	25	22.7
1989	25	22.7
1990	11	18.4
1991	12	18.4
1992	14	18.4
1993	15	18.4
1994	26	18.4
1995	26	18.4
1996	24	18.4
1997	23	18.4
1998	9	18.4
1999	24	18.4
2000	33	33

For each year, a bar from the first to the last day at Arneiroz meeting 10 mm (0.39 in).

First to last qualifying date each year at Arneiroz
Year	First date	Last date
1911	1911-01-21	1911-12-29
1912	1912-01-17	1912-11-04
1913	1913-01-04	1913-12-09
1914	1914-01-03	1914-08-17
1915	1915-02-02	1915-12-17
1916	1916-01-22	1916-12-29
1917	1917-01-01	1917-12-18
1918	1918-01-01	1918-06-30
1919	1919-02-15	1919-06-10
1920	1920-02-29	1920-12-30
1921	1921-01-04	1921-06-05
1922	1922-01-16	1922-12-02
1923	1923-01-29	1923-12-01
1924	1924-01-25	1924-10-24
1925	1925-01-09	1925-12-25
1926	1926-01-01	1926-05-15
1927	1927-01-25	1927-12-07
1928	1928-01-07	1928-12-06
1929	1929-02-02	1929-12-27
1930	1930-01-09	1930-06-06
1931	1931-01-09	1931-10-07
1948	1948-01-19	1948-07-20
1949	1949-02-01	1949-11-28
1950	1950-01-01	1950-12-22
1951	1951-01-30	1951-12-15
1953	1953-01-17	1953-12-16
1954	1954-01-06	1954-11-27
1955	1955-01-18	1955-10-22
1956	1956-02-02	1956-10-21
1958	1958-02-05	1958-12-31
1959	1959-01-22	1959-06-18
1960	1960-01-05	1960-05-24
1961	1961-01-18	1961-04-18
1962	1962-01-22	1962-12-17
1963	1963-01-19	1963-12-25
1964	1964-01-24	1964-09-09
1965	1965-02-09	1965-10-05
1966	1966-01-30	1966-06-23
1967	1967-01-01	1967-12-29
1968	1968-01-09	1968-12-28
1969	1969-01-18	1969-07-10
1972	1972-01-19	1972-12-24
1978	1978-01-15	1978-07-29
1979	1979-01-15	1979-11-19
1980	1980-01-11	1980-10-27
1982	1982-01-27	1982-05-13
1983	1983-01-01	1983-06-04
1984	1984-01-09	1984-11-15
1985	1985-01-01	1985-12-31
1986	1986-01-22	1986-10-09
1987	1987-01-04	1987-06-30
1988	1988-01-02	1988-12-27
1989	1989-01-09	1989-06-01
1990	1990-01-28	1990-09-26
1991	1991-01-08	1991-05-15
1992	1992-01-26	1992-06-29
1993	1993-02-01	1993-12-28
1994	1994-01-05	1994-12-29
1995	1995-02-03	1995-11-24
1996	1996-01-06	1996-10-19
1997	1997-01-07	1997-12-22
1998	1998-01-12	1998-06-01
1999	1999-01-10	1999-12-31
2000	2000-01-08	2000-12-18

Every Fixed Threshold

Fixed thresholds at Arneiroz
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	64	40	1985	33
25 mm (0.98 in): Days with 25 mm or more rain	63	19	1924	8
50 mm (1.97 in): Days with 50 mm or more rain	46	5	1988	2
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

Data for Arneiroz 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).

Arneiroz Threshold Days by Year (BR000640003)

Key Facts for Arneiroz Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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