M.R.A. Threshold Days by Year

4 fixed thresholds counted per year at M.R.A. (ASN00048063): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for M.R.A. Thresholds

M.R.A.: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1921 with 24.
M.R.A.: days with 25 mm (0.98 in) or more of precipitation in 62 years, most in 1920 with 10.
M.R.A.: days with 50 mm (1.97 in) or more of precipitation in 30 years, most in 1939 with 3.
M.R.A.: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1891 with 1.
4 fixed thresholds have at least one qualifying day at M.R.A..

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

66 years with a qualifying day

Days per year at M.R.A. with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 24 in 1921.

Days with 10 mm (0.39 in) or more of precipitation per year at M.R.A.
Year	Days	Decade average
1882	9	9.9
1883	8	9.9
1884	8	9.9
1885	10	9.9
1886	14	9.9
1887	10	9.9
1888	4	9.9
1889	16	9.9
1890	18	14.9
1891	14	14.9
1892	12	14.9
1893	21	14.9
1894	17	14.9
1895	14	14.9
1896	17	14.9
1897	17	14.9
1898	12	14.9
1899	7	14.9
1900	10	11.7
1901	8	11.7
1902	4	11.7
1903	13	11.7
1904	10	11.7
1905	11	11.7
1906	20	11.7
1907	16	11.7
1908	13	11.7
1910	17	12
1911	13	12
1912	9	12
1913	14	12
1914	8	12
1915	7	12
1916	17	12
1917	18	12
1918	8	12
1919	9	12
1920	18	13
1921	24	13
1922	4	13
1923	9	13
1924	19	13
1925	15	13
1926	15	13
1927	14	13
1928	6	13
1929	6	13
1930	11	11.8
1931	22	11.8
1932	6	11.8
1933	10	11.8
1934	13	11.8
1935	6	11.8
1936	14	11.8
1937	7	11.8
1938	10	11.8
1939	19	11.8
1940	5	10.4
1941	8	10.4
1942	14	10.4
1943	11	10.4
1944	6	10.4
1945	11	10.4
1946	7	10.4
1947	18	10.4
1948	14	10.4

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

First to last qualifying date each year at M.R.A.
Year	First date	Last date
1882	1882-04-22	1882-12-04
1883	1883-02-25	1883-10-11
1884	1884-02-08	1884-11-13
1885	1885-01-22	1885-12-23
1886	1886-05-18	1886-12-09
1887	1887-01-25	1887-12-24
1888	1888-01-03	1888-05-03
1889	1889-01-03	1889-12-06
1890	1890-01-11	1890-12-07
1891	1891-01-05	1891-11-09
1892	1892-03-24	1892-11-12
1893	1893-01-17	1893-11-21
1894	1894-01-24	1894-12-13
1895	1895-01-21	1895-12-17
1896	1896-01-25	1896-11-27
1897	1897-01-03	1897-12-20
1898	1898-01-06	1898-12-24
1899	1899-01-19	1899-09-12
1900	1900-01-20	1900-12-04
1901	1901-04-21	1901-10-28
1902	1902-08-28	1902-12-04
1903	1903-01-27	1903-09-17
1904	1904-01-02	1904-12-17
1905	1905-02-17	1905-12-31
1906	1906-01-29	1906-11-29
1907	1907-01-10	1907-12-28
1908	1908-02-01	1908-12-12
1910	1910-01-28	1910-12-13
1911	1911-01-10	1911-12-05
1912	1912-02-29	1912-12-23
1913	1913-02-05	1913-12-18
1914	1914-02-26	1914-12-30
1915	1915-05-15	1915-12-15
1916	1916-04-02	1916-12-12
1917	1917-01-18	1917-12-13
1918	1918-01-12	1918-10-25
1919	1919-02-28	1919-12-27
1920	1920-06-02	1920-12-10
1921	1921-01-03	1921-12-27
1922	1922-01-13	1922-12-11
1923	1923-02-10	1923-12-25
1924	1924-02-07	1924-12-15
1925	1925-01-13	1925-12-31
1926	1926-01-03	1926-12-28
1927	1927-01-06	1927-12-20
1928	1928-01-20	1928-04-17
1929	1929-02-21	1929-11-18
1930	1930-01-24	1930-12-16
1931	1931-03-03	1931-12-08
1932	1932-03-16	1932-11-13
1933	1933-03-31	1933-12-02
1934	1934-01-31	1934-11-30
1935	1935-01-15	1935-12-01
1936	1936-01-06	1936-12-17
1937	1937-02-03	1937-08-17
1938	1938-05-25	1938-11-17
1939	1939-01-26	1939-11-17
1940	1940-04-12	1940-12-28
1941	1941-01-01	1941-10-13
1942	1942-01-04	1942-12-11
1943	1943-01-04	1943-12-18
1944	1944-02-07	1944-08-23
1945	1945-01-30	1945-10-01
1946	1946-01-19	1946-12-29
1947	1947-02-02	1947-12-24
1948	1948-02-14	1948-11-17

Every Fixed Threshold

Fixed thresholds at M.R.A.
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	66	24	1921	14
25 mm (0.98 in): Days with 25 mm or more rain	62	10	1920	4
50 mm (1.97 in): Days with 50 mm or more rain	30	3	1939	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1891	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1882.

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Data for M.R.A. 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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

M.R.A. Threshold Days by Year

Key Facts for M.R.A. Thresholds

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

Every Fixed Threshold

Download the Data

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