Rosalia Threshold Days by Year (USC00457180)

17 fixed thresholds counted per year at Rosalia (USC00457180): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosalia Thresholds

Rosalia: days with a maximum temperature at or above 30 C (86 F) in 129 years, most in 1922 with 65.
Rosalia: days with a maximum temperature at or above 90 F (32.2 C) in 129 years, most in 2021 with 46.
Rosalia: days with a maximum temperature at or below 0 C (32 F) in 129 years, most in 1985 with 76.
Rosalia: days with 10 mm (0.39 in) or more of precipitation in 129 years, most in 1996 with 25.
17 fixed thresholds have at least one qualifying day at Rosalia.

Days at or above 30 C (86 F)

129 years with a qualifying day

Days per year at Rosalia with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 65 in 1922.

Days at or above 30 C (86 F) per year at Rosalia
Year	Days	Decade average
1893	20	23.9
1894	26	23.9
1895	18	23.9
1896	34	23.9
1897	23	23.9
1898	29	23.9
1899	17	23.9
1900	19	25.1
1901	24	25.1
1902	17	25.1
1903	15	25.1
1904	35	25.1
1905	28	25.1
1906	38	25.1
1907	10	25.1
1908	41	25.1
1909	24	25.1
1910	23	33
1911	18	33
1912	21	33
1913	27	33
1914	34	33
1915	36	33
1916	24	33
1917	52	33
1918	45	33
1919	50	33
1920	47	45.5
1921	36	45.5
1922	65	45.5
1923	41	45.5
1924	50	45.5
1925	53	45.5
1926	40	45.5
1927	39	45.5
1928	41	45.5
1929	43	45.5
1930	43	44.9
1931	49	44.9
1932	44	44.9
1933	48	44.9
1934	59	44.9
1935	32	44.9
1936	50	44.9
1937	31	44.9
1938	46	44.9
1939	47	44.9
1940	48	32.4
1941	36	32.4
1942	38	32.4
1943	20	32.4
1944	29	32.4
1945	32	32.4
1946	24	32.4
1949	32	32.4
1951	32	26.3
1952	28	26.3
1953	22	26.3
1954	10	26.3
1955	27	26.3
1956	28	26.3
1957	14	26.3
1958	51	26.3
1959	25	26.3
1960	23	22.7
1961	36	22.7
1962	18	22.7
1963	26	22.7
1964	11	22.7
1965	19	22.7
1966	19	22.7
1967	37	22.7
1968	22	22.7
1969	16	22.7
1970	47	33.9
1971	40	33.9
1972	27	33.9
1973	42	33.9
1974	34	33.9
1975	25	33.9
1976	22	33.9
1977	39	33.9
1978	26	33.9
1979	37	33.9
1980	16	29.8
1981	30	29.8
1982	29	29.8
1983	22	29.8
1984	28	29.8
1985	34	29.8
1986	37	29.8
1987	40	29.8
1988	40	29.8
1989	22	29.8
1990	33	35
1991	29	35
1992	32	35
1993	18	35
1994	49	35
1995	29	35
1996	35	35
1997	31	35
1998	54	35
1999	40	35
2001	44	46.3
2002	33	46.3
2003	57	46.3
2004	43	46.3
2005	38	46.3
2006	59	46.3
2007	47	46.3
2008	44	46.3
2009	52	46.3
2010	29	41.3
2011	43	41.3
2012	33	41.3
2013	49	41.3
2014	44	41.3
2015	52	41.3
2016	37	41.3
2017	54	41.3
2018	40	41.3
2019	32	41.3
2020	37	50.2
2021	60	50.2
2022	51	50.2
2024	49	50.2
2025	58	50.2
2026	46	50.2

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

First to last qualifying date each year at Rosalia
Year	First date	Last date
1893	1893-07-17	1893-09-04
1894	1894-05-24	1894-08-27
1895	1895-06-28	1895-09-01
1896	1896-06-26	1896-08-29
1897	1897-05-13	1897-09-20
1898	1898-06-09	1898-09-18
1899	1899-07-11	1899-09-25
1900	1900-06-20	1900-08-20
1901	1901-07-21	1901-08-30
1902	1902-07-19	1902-09-06
1903	1903-05-31	1903-08-18
1904	1904-06-29	1904-09-06
1905	1905-07-08	1905-09-23
1906	1906-05-09	1906-09-19
1907	1907-07-10	1907-09-09
1908	1908-06-24	1908-09-13
1909	1909-06-01	1909-09-16
1910	1910-05-31	1910-08-20
1911	1911-06-11	1911-09-02
1912	1912-06-07	1912-08-24
1913	1913-06-01	1913-09-12
1914	1914-05-31	1914-09-02
1915	1915-06-23	1915-08-29
1916	1916-06-15	1916-09-21
1917	1917-06-14	1917-09-21
1918	1918-06-07	1918-09-28
1919	1919-05-21	1919-09-03
1920	1920-06-21	1920-09-30
1921	1921-06-23	1921-08-30
1922	1922-05-31	1922-09-25
1923	1923-06-28	1923-09-13
1924	1924-05-10	1924-09-16
1925	1925-06-19	1925-09-24
1926	1926-04-29	1926-08-26
1927	1927-06-06	1927-08-23
1928	1928-05-20	1928-09-23
1929	1929-05-21	1929-09-17
1930	1930-05-27	1930-09-04
1931	1931-05-13	1931-09-04
1932	1932-06-12	1932-09-16
1933	1933-06-02	1933-09-03
1934	1934-04-21	1934-10-11
1935	1935-06-11	1935-09-10
1936	1936-04-16	1936-08-29
1937	1937-06-01	1937-09-15
1938	1938-05-23	1938-09-23
1939	1939-04-28	1939-09-20
1940	1940-05-23	1940-09-12
1941	1941-05-12	1941-08-23
1942	1942-05-21	1942-09-04
1943	1943-07-06	1943-09-25
1944	1944-06-29	1944-09-12
1945	1945-06-21	1945-09-01
1946	1946-06-20	1946-08-24
1949	1949-05-12	1949-09-10
1951	1951-07-01	1951-09-19
1952	1952-06-10	1952-09-27
1953	1953-07-08	1953-09-16
1954	1954-05-19	1954-08-14
1955	1955-06-11	1955-09-08
1956	1956-05-19	1956-09-10
1957	1957-06-06	1957-09-26
1958	1958-05-23	1958-09-11
1959	1959-06-20	1959-09-13
1960	1960-07-07	1960-08-19
1961	1961-06-16	1961-08-25
1962	1962-06-25	1962-09-26
1963	1963-06-16	1963-09-29
1964	1964-07-08	1964-08-18
1965	1965-07-07	1965-08-19
1966	1966-05-06	1966-09-23
1967	1967-06-21	1967-09-29
1968	1968-06-27	1968-09-10
1969	1969-06-05	1969-09-11
1970	1970-06-03	1970-09-29
1971	1971-06-23	1971-10-06
1972	1972-05-30	1972-09-05
1973	1973-05-15	1973-09-12
1974	1974-06-12	1974-09-25
1975	1975-07-05	1975-10-03
1976	1976-06-29	1976-10-02
1977	1977-04-24	1977-08-22
1978	1978-06-06	1978-09-27
1979	1979-06-12	1979-09-21
1980	1980-07-09	1980-10-08
1981	1981-07-04	1981-09-19
1982	1982-06-12	1982-09-04
1983	1983-05-29	1983-09-01
1984	1984-06-29	1984-09-19
1985	1985-05-24	1985-08-30
1986	1986-05-27	1986-08-29
1987	1987-04-28	1987-10-03
1988	1988-05-13	1988-09-15
1989	1989-07-07	1989-09-26
1990	1990-06-25	1990-09-26
1991	1991-07-03	1991-09-27
1992	1992-05-06	1992-10-02
1993	1993-05-12	1993-09-11
1994	1994-05-12	1994-09-26
1995	1995-05-30	1995-09-17
1996	1996-06-08	1996-09-13
1997	1997-07-05	1997-09-26
1998	1998-07-01	1998-09-17
1999	1999-05-24	1999-09-23
2001	2001-05-23	2001-09-25
2002	2002-06-15	2002-09-15
2003	2003-05-25	2003-10-05
2004	2004-06-23	2004-09-01
2005	2005-05-29	2005-08-29
2006	2006-05-16	2006-09-12
2007	2007-06-02	2007-09-14
2008	2008-05-17	2008-10-02
2009	2009-05-30	2009-09-25
2010	2010-07-09	2010-10-03
2011	2011-06-23	2011-10-01
2012	2012-05-15	2012-09-22
2013	2013-05-11	2013-09-16
2014	2014-07-02	2014-09-23
2015	2015-06-08	2015-09-13
2016	2016-06-05	2016-09-27
2017	2017-05-30	2017-09-13
2018	2018-05-16	2018-09-08
2019	2019-06-13	2019-09-08
2020	2020-05-30	2020-09-12
2021	2021-06-02	2021-09-10
2022	2022-06-28	2022-09-28
2024	2024-06-23	2024-09-29
2025	2025-05-26	2025-09-26
2026	2026-05-29	2026-09-22

Every Fixed Threshold

Fixed thresholds at Rosalia
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	129	65	1922	46
35 C (95 F): Days	120	21	1998	10
40 C (104 F): Days	20	5	2021	1
90 F (32.2 C): Days	129	46	2021	22
100 F (37.8 C): Days	60	8	1933	1
110 F (43.3 C): Days	1	1	2021	1
0 C (32 F): Ice days (max	129	76	1985	9
0 C (32 F): Frost days (min	116	186	1970	76
-10 C (14 F): Days with min	114	54	1985	4
-20 C (-4 F): Days with min	69	13	1929	5
-30 C (-22 F): Days with min	7	2	1957	1
20 C (68 F): Tropical nights (min	22	2	1906	2
10 mm (0.39 in): Days with 10 mm or more rain	129	25	1996	7
25 mm (0.98 in): Days with 25 mm or more rain	55	4	1902	1
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1907	1
10 cm (3.9 in): Days with 10 cm or more snowfall	45	6	2008	2
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1963	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Rosalia 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Rosalia Threshold Days by Year (USC00457180)

Key Facts for Rosalia Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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