Ariyalur Threshold Days by Year (IN020131800)

5 fixed thresholds counted per year at Ariyalur (IN020131800): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ariyalur Thresholds

Ariyalur: days with 10 mm (0.39 in) or more of precipitation in 68 years, most in 1963 with 42.
Ariyalur: days with 25 mm (0.98 in) or more of precipitation in 68 years, most in 1963 with 24.
Ariyalur: days with 50 mm (1.97 in) or more of precipitation in 67 years, most in 1913 with 10.
Ariyalur: days with 100 mm (3.94 in) or more of precipitation in 32 years, most in 1933 with 3.
5 fixed thresholds have at least one qualifying day at Ariyalur.

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

68 years with a qualifying day

Days per year at Ariyalur with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1963.

Days with 10 mm (0.39 in) or more of precipitation per year at Ariyalur
Year	Days	Decade average
1901	34	28.3
1902	32	28.3
1903	30	28.3
1904	20	28.3
1905	32	28.3
1906	30	28.3
1907	23	28.3
1908	24	28.3
1909	30	28.3
1910	28	27.5
1911	35	27.5
1912	22	27.5
1913	33	27.5
1914	30	27.5
1915	28	27.5
1916	19	27.5
1917	30	27.5
1918	26	27.5
1919	24	27.5
1920	38	32
1921	40	32
1922	36	32
1923	28	32
1924	28	32
1925	37	32
1926	27	32
1927	17	32
1928	32	32
1929	37	32
1930	27	30.3
1931	40	30.3
1932	40	30.3
1933	32	30.3
1934	25	30.3
1935	28	30.3
1936	25	30.3
1937	40	30.3
1938	21	30.3
1939	25	30.3
1940	33	27.6
1941	33	27.6
1942	10	27.6
1943	31	27.6
1944	40	27.6
1945	19	27.6
1946	33	27.6
1947	26	27.6
1948	24	27.6
1949	27	27.6
1950	27	26
1951	30	26
1952	13	26
1953	24	26
1954	32	26
1955	28	26
1956	31	26
1957	23	26
1959	26	26
1960	27	31.3
1961	37	31.3
1962	29	31.3
1963	42	31.3
1964	16	31.3
1966	39	31.3
1967	32	31.3
1968	30	31.3
1969	30	31.3
1970	29	29

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

First to last qualifying date each year at Ariyalur
Year	First date	Last date
1901	1901-02-22	1901-12-12
1902	1902-01-04	1902-12-08
1903	1903-01-04	1903-12-30
1904	1904-01-02	1904-12-19
1905	1905-04-11	1905-12-14
1906	1906-01-17	1906-12-29
1907	1907-04-12	1907-12-17
1908	1908-02-24	1908-11-01
1909	1909-01-01	1909-12-14
1910	1910-02-02	1910-11-24
1911	1911-04-15	1911-12-25
1912	1912-05-10	1912-11-25
1913	1913-04-17	1913-12-20
1914	1914-05-12	1914-12-07
1915	1915-01-18	1915-12-28
1916	1916-04-21	1916-11-23
1917	1917-01-31	1917-11-27
1918	1918-01-04	1918-12-19
1919	1919-05-21	1919-12-31
1920	1920-01-01	1920-11-29
1921	1921-01-10	1921-12-31
1922	1922-01-07	1922-12-02
1923	1923-01-11	1923-12-17
1924	1924-01-08	1924-12-15
1925	1925-03-14	1925-12-12
1926	1926-01-26	1926-11-08
1927	1927-02-11	1927-12-01
1928	1928-01-07	1928-12-28
1929	1929-01-08	1929-12-25
1930	1930-02-13	1930-11-06
1931	1931-01-06	1931-12-27
1932	1932-03-05	1932-12-17
1933	1933-03-12	1933-12-17
1934	1934-01-25	1934-12-14
1935	1935-01-22	1935-12-27
1936	1936-02-07	1936-12-19
1937	1937-01-13	1937-11-29
1938	1938-03-22	1938-12-27
1939	1939-01-11	1939-11-16
1940	1940-04-27	1940-12-06
1941	1941-04-10	1941-12-15
1942	1942-08-17	1942-12-19
1943	1943-04-10	1943-11-21
1944	1944-02-19	1944-12-22
1945	1945-04-01	1945-11-13
1946	1946-01-21	1946-12-27
1947	1947-01-01	1947-10-23
1948	1948-01-17	1948-12-20
1949	1949-04-06	1949-11-27
1950	1950-02-19	1950-12-13
1951	1951-03-31	1951-12-15
1952	1952-02-21	1952-12-07
1953	1953-01-12	1953-11-28
1954	1954-01-04	1954-12-15
1955	1955-01-10	1955-12-02
1956	1956-01-29	1956-12-27
1957	1957-07-23	1957-12-30
1959	1959-02-03	1959-12-02
1960	1960-03-02	1960-11-21
1961	1961-01-05	1961-12-11
1962	1962-02-20	1962-12-02
1963	1963-01-08	1963-12-22
1964	1964-06-06	1964-12-24
1966	1966-05-01	1966-12-21
1967	1967-01-11	1967-12-16
1968	1968-03-17	1968-12-19
1969	1969-05-30	1969-12-31
1970	1970-01-20	1970-12-28

Every Fixed Threshold

Fixed thresholds at Ariyalur
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	68	42	1963	29
25 mm (0.98 in): Days with 25 mm or more rain	68	24	1963	15
50 mm (1.97 in): Days with 50 mm or more rain	67	10	1913	5
100 mm (3.94 in): Days with 100 mm or more rain	32	3	1933	1
200 mm (7.87 in): Days with 200 mm or more rain	5	1	1913	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

Data for Ariyalur 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).

Ariyalur Threshold Days by Year (IN020131800)

Key Facts for Ariyalur Thresholds

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

Every Fixed Threshold

Download the Data

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