Vallam Threshold Days by Year

5 fixed thresholds counted per year at Vallam (IN020121700): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Vallam Thresholds

Vallam: days with 10 mm (0.39 in) or more of precipitation in 62 years, most in 1902 with 43.
Vallam: days with 25 mm (0.98 in) or more of precipitation in 62 years, most in 1920 with 26.
Vallam: days with 50 mm (1.97 in) or more of precipitation in 62 years, most in 1920 with 11.
Vallam: days with 100 mm (3.94 in) or more of precipitation in 25 years, most in 1930 with 4.
5 fixed thresholds have at least one qualifying day at Vallam.

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

62 years with a qualifying day

Days per year at Vallam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 43 in 1902.

Days with 10 mm (0.39 in) or more of precipitation per year at Vallam
Year	Days	Decade average
1901	35	28.2
1902	43	28.2
1903	38	28.2
1904	21	28.2
1905	24	28.2
1906	33	28.2
1907	24	28.2
1908	12	28.2
1909	24	28.2
1910	27	28.4
1911	21	28.4
1912	20	28.4
1913	38	28.4
1914	23	28.4
1915	38	28.4
1916	29	28.4
1917	34	28.4
1918	16	28.4
1919	38	28.4
1920	40	30.2
1921	35	30.2
1922	27	30.2
1923	28	30.2
1924	21	30.2
1925	28	30.2
1926	33	30.2
1927	21	30.2
1928	31	30.2
1929	38	30.2
1930	33	30.3
1931	32	30.3
1932	39	30.3
1933	27	30.3
1934	23	30.3
1935	25	30.3
1936	21	30.3
1937	32	30.3
1938	32	30.3
1939	39	30.3
1940	41	32.5
1941	36	32.5
1942	27	32.5
1943	38	32.5
1944	42	32.5
1945	25	32.5
1946	34	32.5
1947	28	32.5
1948	26	32.5
1949	28	32.5
1950	24	25.5
1951	20	25.5
1952	18	25.5
1953	22	25.5
1954	32	25.5
1955	37	25.5
1956	24	25.5
1957	31	25.5
1958	23	25.5
1959	24	25.5
1960	33	28.3
1961	22	28.3
1963	30	28.3

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

First to last qualifying date each year at Vallam
Year	First date	Last date
1901	1901-01-11	1901-12-10
1902	1902-01-03	1902-12-20
1903	1903-01-06	1903-12-31
1904	1904-01-01	1904-12-19
1905	1905-04-15	1905-11-24
1906	1906-01-17	1906-12-29
1907	1907-04-29	1907-12-19
1908	1908-02-24	1908-12-01
1909	1909-01-01	1909-11-15
1910	1910-02-19	1910-11-24
1911	1911-01-17	1911-12-25
1912	1912-06-05	1912-12-19
1913	1913-04-17	1913-12-20
1914	1914-04-03	1914-12-05
1915	1915-01-18	1915-12-28
1916	1916-04-21	1916-12-09
1917	1917-01-31	1917-12-14
1918	1918-01-02	1918-12-16
1919	1919-05-08	1919-12-31
1920	1920-01-01	1920-11-30
1921	1921-01-10	1921-12-31
1922	1922-01-09	1922-12-02
1923	1923-01-11	1923-12-31
1924	1924-03-22	1924-12-15
1925	1925-03-13	1925-12-28
1926	1926-01-25	1926-11-20
1927	1927-01-07	1927-12-07
1928	1928-01-05	1928-12-28
1929	1929-01-08	1929-12-27
1930	1930-01-07	1930-12-31
1931	1931-01-06	1931-12-27
1932	1932-03-04	1932-12-17
1933	1933-02-05	1933-12-17
1934	1934-01-09	1934-11-28
1935	1935-01-21	1935-12-27
1936	1936-02-08	1936-12-18
1937	1937-03-14	1937-11-26
1938	1938-02-06	1938-12-28
1939	1939-01-11	1939-11-22
1940	1940-03-11	1940-12-06
1941	1941-01-07	1941-12-22
1942	1942-04-04	1942-12-23
1943	1943-01-02	1943-12-14
1944	1944-01-11	1944-12-22
1945	1945-04-01	1945-11-10
1946	1946-01-21	1946-12-27
1947	1947-01-01	1947-11-19
1948	1948-01-18	1948-11-29
1949	1949-05-13	1949-11-27
1950	1950-02-20	1950-12-14
1951	1951-05-22	1951-11-21
1952	1952-01-29	1952-12-10
1953	1953-01-09	1953-12-15
1954	1954-01-06	1954-12-12
1955	1955-01-09	1955-12-06
1956	1956-01-13	1956-12-26
1957	1957-04-24	1957-12-29
1958	1958-03-17	1958-11-21
1959	1959-05-24	1959-12-02
1960	1960-01-23	1960-12-13
1961	1961-01-11	1961-12-05
1963	1963-01-07	1963-12-07

Every Fixed Threshold

Fixed thresholds at Vallam
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	62	43	1902	30
25 mm (0.98 in): Days with 25 mm or more rain	62	26	1920	17
50 mm (1.97 in): Days with 50 mm or more rain	62	11	1920	5
100 mm (3.94 in): Days with 100 mm or more rain	25	4	1930	3
200 mm (7.87 in): Days with 200 mm or more rain	3	1	1930	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 Vallam 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).

Vallam Threshold Days by Year

Key Facts for Vallam Thresholds

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

Every Fixed Threshold

Download the Data

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