Mermentau Threshold Days by Year

6 fixed thresholds counted per year at Mermentau (USC00166142): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mermentau Thresholds

Mermentau: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1961 with 57.
Mermentau: days with 25 mm (0.98 in) or more of precipitation in 43 years, most in 1946 with 28.
Mermentau: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 1943 with 15.
Mermentau: days with 100 mm (3.94 in) or more of precipitation in 29 years, most in 1943 with 3.
6 fixed thresholds have at least one qualifying day at Mermentau.

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

43 years with a qualifying day

Days per year at Mermentau with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1961.

Days with 10 mm (0.39 in) or more of precipitation per year at Mermentau
Year	Days	Decade average
1943	44	46.4
1945	48	46.4
1946	55	46.4
1948	37	46.4
1949	48	46.4
1950	46	42.2
1951	41	42.2
1952	38	42.2
1953	35	42.2
1954	37	42.2
1955	42	42.2
1956	36	42.2
1957	51	42.2
1958	45	42.2
1959	51	42.2
1960	45	43.9
1961	57	43.9
1962	42	43.9
1963	39	43.9
1964	39	43.9
1965	39	43.9
1966	54	43.9
1967	38	43.9
1968	49	43.9
1969	37	43.9
1970	44	43.9
1971	44	43.9
1972	49	43.9
1973	49	43.9
1974	54	43.9
1975	46	43.9
1976	36	43.9
1977	40	43.9
1978	37	43.9
1979	40	43.9
1980	32	41.8
1981	32	41.8
1982	43	41.8
1983	46	41.8
1984	43	41.8
1985	43	41.8
1986	45	41.8
1987	50	41.8

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

First to last qualifying date each year at Mermentau
Year	First date	Last date
1943	1943-01-26	1943-12-28
1945	1945-01-01	1945-12-23
1946	1946-01-05	1946-12-31
1948	1948-01-20	1948-12-28
1949	1949-01-05	1949-12-28
1950	1950-01-05	1950-12-28
1951	1951-01-02	1951-12-18
1952	1952-01-28	1952-12-30
1953	1953-01-23	1953-12-29
1954	1954-01-05	1954-12-29
1955	1955-01-01	1955-12-04
1956	1956-01-19	1956-12-23
1957	1957-01-23	1957-12-28
1958	1958-01-13	1958-12-24
1959	1959-01-01	1959-12-17
1960	1960-01-01	1960-12-31
1961	1961-01-07	1961-12-18
1962	1962-01-05	1962-12-29
1963	1963-01-12	1963-12-21
1964	1964-01-04	1964-12-18
1965	1965-01-23	1965-12-19
1966	1966-01-03	1966-12-28
1967	1967-01-14	1967-12-28
1968	1968-01-01	1968-12-21
1969	1969-01-22	1969-12-30
1970	1970-01-06	1970-12-31
1971	1971-01-07	1971-12-20
1972	1972-01-02	1972-12-21
1973	1973-01-11	1973-12-25
1974	1974-01-03	1974-12-27
1975	1975-01-08	1975-12-29
1976	1976-01-26	1976-12-26
1977	1977-01-03	1977-12-29
1978	1978-01-08	1978-12-17
1979	1979-01-07	1979-12-24
1980	1980-01-04	1980-12-10
1981	1981-01-07	1981-12-31
1982	1982-01-13	1982-12-28
1983	1983-01-01	1983-12-28
1984	1984-01-10	1984-12-05
1985	1985-01-01	1985-12-28
1986	1986-01-11	1986-12-23
1987	1987-01-04	1987-12-31

Every Fixed Threshold

Fixed thresholds at Mermentau
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	43	57	1961	50
25 mm (0.98 in): Days with 25 mm or more rain	43	28	1946	21
50 mm (1.97 in): Days with 50 mm or more rain	42	15	1943	6
100 mm (3.94 in): Days with 100 mm or more rain	29	3	1943	1
200 mm (7.87 in): Days with 200 mm or more rain	6	1	1953	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	1	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1943.

Download the Data

Data for Mermentau 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

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

Mermentau Threshold Days by Year

Key Facts for Mermentau Thresholds

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

Every Fixed Threshold

Download the Data

Related