Roseau Threshold Days by Year (USC00217087)

19 fixed thresholds counted per year at Roseau (USC00217087): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Roseau Thresholds

Roseau: days with a maximum temperature at or above 30 C (86 F) in 83 years, most in 1933 with 40.
Roseau: days with a maximum temperature at or below 0 C (32 F) in 83 years, most in 1979 with 133.
Roseau: nights with a minimum temperature at or below 0 C (32 F) in 77 years, most in 1917 with 250.
Roseau: nights with a minimum temperature at or below -10 C (14 F) in 77 years, most in 1936 with 137.
19 fixed thresholds have at least one qualifying day at Roseau.

Days at or above 30 C (86 F)

83 years with a qualifying day

Days per year at Roseau with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 40 in 1933.

Days at or above 30 C (86 F) per year at Roseau
Year	Days	Decade average
1909	9	9
1910	29	18.5
1913	19	18.5
1914	18	18.5
1915	7	18.5
1916	19	18.5
1917	20	18.5
1918	15	18.5
1919	21	18.5
1920	18	18.3
1921	24	18.3
1922	23	18.3
1923	27	18.3
1924	6	18.3
1925	21	18.3
1926	18	18.3
1927	13	18.3
1928	8	18.3
1929	25	18.3
1930	21	28.1
1931	33	28.1
1932	25	28.1
1933	40	28.1
1934	25	28.1
1935	28	28.1
1936	40	28.1
1937	19	28.1
1938	18	28.1
1939	32	28.1
1940	18	14.4
1941	22	14.4
1942	4	14.4
1943	11	14.4
1944	5	14.4
1945	12	14.4
1946	16	14.4
1947	15	14.4
1948	18	14.4
1949	23	14.4
1950	6	15.2
1951	10	15.2
1952	28	15.2
1953	21	15.2
1954	8	15.2
1955	32	15.2
1956	4	15.2
1957	18	15.2
1958	12	15.2
1959	13	15.2
1960	17	15
1961	36	15
1962	8	15
1963	16	15
1964	15	15
1965	6	15
1966	18	15
1967	9	15
1968	2	15
1969	23	15
1970	29	14
1971	12	14
1972	19	14
1973	13	14
1976	16	14
1977	11	14
1978	11	14
1979	1	14
1980	30	12.5
1981	3	12.5
1982	3	12.5
1983	23	12.5
1984	14	12.5
1985	2	12.5
1990	13	7.3
1992	3	7.3
1993	2	7.3
1994	2	7.3
1995	16	7.3
1999	8	7.3
2000	13	16.3
2002	18	16.3
2003	15	16.3
2006	19	16.3

For each year, a bar from the first to the last day at Roseau meeting 30 C (86 F).

First to last qualifying date each year at Roseau
Year	First date	Last date
1909	1909-06-19	1909-10-06
1910	1910-06-13	1910-08-20
1913	1913-05-27	1913-09-06
1914	1914-06-07	1914-09-20
1915	1915-08-09	1915-09-05
1916	1916-07-05	1916-08-20
1917	1917-06-10	1917-09-21
1918	1918-05-04	1918-08-27
1919	1919-05-27	1919-08-20
1920	1920-06-12	1920-10-06
1921	1921-06-16	1921-09-01
1922	1922-05-25	1922-09-21
1923	1923-05-27	1923-09-03
1924	1924-07-06	1924-08-29
1925	1925-05-19	1925-08-28
1926	1926-05-05	1926-09-01
1927	1927-06-19	1927-09-13
1928	1928-05-23	1928-08-13
1929	1929-06-10	1929-09-02
1930	1930-05-21	1930-09-23
1931	1931-06-17	1931-10-02
1932	1932-05-13	1932-08-24
1933	1933-05-16	1933-08-20
1934	1934-04-29	1934-08-18
1935	1935-06-29	1935-08-15
1936	1936-05-27	1936-09-11
1937	1937-05-28	1937-09-02
1938	1938-06-20	1938-08-18
1939	1939-05-29	1939-09-02
1940	1940-05-31	1940-09-19
1941	1941-05-18	1941-08-08
1942	1942-07-11	1942-08-20
1943	1943-06-18	1943-07-31
1944	1944-05-30	1944-08-01
1945	1945-06-22	1945-09-07
1946	1946-06-22	1946-08-15
1947	1947-07-03	1947-09-08
1948	1948-05-19	1948-09-04
1949	1949-06-10	1949-08-25
1950	1950-06-22	1950-08-08
1951	1951-05-23	1951-08-02
1952	1952-04-26	1952-09-27
1953	1953-05-07	1953-09-01
1954	1954-07-11	1954-08-24
1955	1955-05-20	1955-09-05
1956	1956-06-09	1956-06-12
1957	1957-07-02	1957-08-10
1958	1958-05-12	1958-08-11
1959	1959-05-25	1959-08-05
1960	1960-07-08	1960-09-05
1961	1961-06-04	1961-08-30
1962	1962-06-27	1962-08-27
1963	1963-06-04	1963-08-21
1964	1964-05-21	1964-08-05
1965	1965-07-22	1965-08-14
1966	1966-06-20	1966-09-12
1967	1967-07-19	1967-08-25
1968	1968-06-03	1968-09-14
1969	1969-05-27	1969-09-13
1970	1970-06-06	1970-10-05
1971	1971-08-07	1971-09-04
1972	1972-05-16	1972-08-30
1973	1973-06-09	1973-08-29
1976	1976-06-06	1976-09-11
1977	1977-05-12	1977-07-23
1978	1978-05-25	1978-09-06
1979	1979-09-04	1979-09-04
1980	1980-04-21	1980-09-07
1981	1981-07-06	1981-08-14
1982	1982-07-20	1982-09-10
1983	1983-07-09	1983-09-03
1984	1984-05-31	1984-08-29
1985	1985-07-07	1985-07-08
1990	1990-04-23	1990-09-03
1992	1992-05-20	1992-08-08
1993	1993-08-10	1993-08-24
1994	1994-05-20	1994-06-24
1995	1995-05-30	1995-09-04
1999	1999-06-22	1999-07-29
2000	2000-07-04	2000-08-26
2002	2002-06-27	2002-09-07
2003	2003-06-15	2003-09-08
2006	2006-05-27	2006-08-08

Every Fixed Threshold

Fixed thresholds at Roseau
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	83	40	1933	19
35 C (95 F): Days	27	14	1936	3
40 C (104 F): Days	1	3	1936	3
90 F (32.2 C): Days	70	25	1961	10
100 F (37.8 C): Days	6	4	1936	1
0 C (32 F): Ice days (max	83	133	1979	105
0 C (32 F): Frost days (min	77	250	1917	201
-10 C (14 F): Days with min	77	137	1936	121
-20 C (-4 F): Days with min	77	96	1950	67
-30 C (-22 F): Days with min	77	44	1916	16
-40 C (-40 F): Days with min	38	10	1936	2
20 C (68 F): Tropical nights (min	49	11	1919	3
25 C (77 F): Days with min	4	3	1919	1
10 mm (0.39 in): Days with 10 mm or more rain	75	22	1922	13
25 mm (0.98 in): Days with 25 mm or more rain	68	8	1941	6
50 mm (1.97 in): Days with 50 mm or more rain	19	2	1909	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1957	1
10 cm (3.9 in): Days with 10 cm or more snowfall	34	7	1995	4
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1938	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1909.

Download the Data

Data for Roseau 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).

Roseau Threshold Days by Year (USC00217087)

Key Facts for Roseau Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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