Riverdale Threshold Days by Year

4 fixed thresholds counted per year at Riverdale (ASN00010635): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riverdale Thresholds

Riverdale: days with 10 mm (0.39 in) or more of precipitation in 112 years, most in 1926 with 28.
Riverdale: days with 25 mm (0.98 in) or more of precipitation in 89 years, most in 1917 with 8.
Riverdale: days with 50 mm (1.97 in) or more of precipitation in 18 years, most in 1982 with 2.
Riverdale: days with 100 mm (3.94 in) or more of precipitation in 3 years, most in 1955 with 1.
4 fixed thresholds have at least one qualifying day at Riverdale.

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

112 years with a qualifying day

Days per year at Riverdale with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 28 in 1926.

Days with 10 mm (0.39 in) or more of precipitation per year at Riverdale
Year	Days	Decade average
1909	19	19
1910	25	17.9
1911	13	17.9
1912	11	17.9
1915	16	17.9
1916	18	17.9
1917	24	17.9
1918	18	17.9
1920	18	18.3
1921	14	18.3
1922	20	18.3
1923	25	18.3
1924	19	18.3
1925	15	18.3
1926	28	18.3
1927	16	18.3
1928	13	18.3
1929	15	18.3
1930	15	16.5
1931	17	16.5
1932	16	16.5
1933	21	16.5
1934	15	16.5
1935	17	16.5
1936	7	16.5
1939	24	16.5
1940	6	15.7
1941	14	15.7
1942	16	15.7
1943	21	15.7
1944	14	15.7
1945	21	15.7
1946	21	15.7
1947	15	15.7
1948	13	15.7
1949	16	15.7
1950	12	15.2
1951	17	15.2
1952	13	15.2
1953	14	15.2
1954	12	15.2
1955	23	15.2
1956	15	15.2
1957	14	15.2
1958	14	15.2
1959	18	15.2
1960	16	14.3
1961	17	14.3
1962	11	14.3
1963	24	14.3
1964	10	14.3
1965	15	14.3
1966	10	14.3
1967	15	14.3
1968	14	14.3
1969	11	14.3
1970	12	14.7
1971	11	14.7
1972	7	14.7
1973	15	14.7
1974	23	14.7
1975	19	14.7
1976	14	14.7
1977	15	14.7
1978	22	14.7
1979	9	14.7
1980	20	13.8
1981	15	13.8
1982	10	13.8
1983	27	13.8
1984	13	13.8
1985	7	13.8
1986	8	13.8
1987	9	13.8
1988	15	13.8
1989	14	13.8
1990	12	14.6
1991	20	14.6
1992	15	14.6
1993	11	14.6
1994	9	14.6
1995	18	14.6
1996	16	14.6
1997	15	14.6
1998	15	14.6
1999	15	14.6
2000	15	14.6
2001	11	14.6
2002	12	14.6
2003	21	14.6
2004	13	14.6
2006	13	14.6
2007	15	14.6
2008	18	14.6
2009	13	14.6
2010	9	13.8
2011	20	13.8
2012	11	13.8
2013	14	13.8
2014	14	13.8
2015	12	13.8
2016	21	13.8
2017	11	13.8
2018	14	13.8
2019	12	13.8
2020	14	13.6
2021	28	13.6
2022	11	13.6
2023	10	13.6
2024	10	13.6
2025	13	13.6
2026	9	13.6

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

First to last qualifying date each year at Riverdale
Year	First date	Last date
1909	1909-03-26	1909-10-09
1910	1910-01-02	1910-11-27
1911	1911-03-02	1911-10-18
1912	1912-05-08	1912-09-28
1915	1915-02-26	1915-10-19
1916	1916-01-18	1916-10-07
1917	1917-02-10	1917-10-01
1918	1918-01-20	1918-11-27
1920	1920-02-22	1920-08-30
1921	1921-01-10	1921-12-09
1922	1922-02-23	1922-09-24
1923	1923-01-20	1923-10-03
1924	1924-05-12	1924-11-10
1925	1925-03-05	1925-10-19
1926	1926-03-17	1926-10-22
1927	1927-03-13	1927-10-04
1928	1928-01-09	1928-10-21
1929	1929-02-07	1929-11-10
1930	1930-02-24	1930-09-30
1931	1931-03-06	1931-12-16
1932	1932-03-28	1932-10-29
1933	1933-02-03	1933-10-16
1934	1934-03-09	1934-09-11
1935	1935-04-03	1935-10-19
1936	1936-05-22	1936-12-18
1939	1939-01-21	1939-11-02
1940	1940-06-26	1940-12-03
1941	1941-04-27	1941-09-19
1942	1942-03-13	1942-12-02
1943	1943-01-31	1943-12-08
1944	1944-04-29	1944-12-07
1945	1945-03-26	1945-09-22
1946	1946-01-13	1946-12-23
1947	1947-04-07	1947-10-18
1948	1948-04-30	1948-12-24
1949	1949-04-29	1949-11-08
1950	1950-05-05	1950-10-03
1951	1951-02-14	1951-12-04
1952	1952-02-13	1952-11-19
1953	1953-02-03	1953-10-11
1954	1954-01-20	1954-09-09
1955	1955-02-15	1955-09-20
1956	1956-01-03	1956-09-17
1957	1957-04-21	1957-10-21
1958	1958-02-14	1958-09-01
1959	1959-02-08	1959-12-31
1960	1960-01-01	1960-12-17
1961	1961-01-26	1961-09-09
1962	1962-05-26	1962-11-08
1963	1963-01-31	1963-10-31
1964	1964-06-11	1964-10-20
1965	1965-03-26	1965-12-20
1966	1966-04-23	1966-10-23
1967	1967-01-19	1967-08-24
1968	1968-01-27	1968-09-04
1969	1969-03-12	1969-11-04
1970	1970-02-05	1970-10-04
1971	1971-03-27	1971-12-09
1972	1972-04-20	1972-10-07
1973	1973-01-07	1973-11-14
1974	1974-04-23	1974-11-18
1975	1975-04-01	1975-11-17
1976	1976-01-07	1976-11-11
1977	1977-04-27	1977-11-24
1978	1978-02-19	1978-12-22
1979	1979-05-21	1979-11-10
1980	1980-02-10	1980-12-31
1981	1981-05-25	1981-12-09
1982	1982-01-22	1982-11-25
1983	1983-02-15	1983-12-31
1984	1984-04-12	1984-11-17
1985	1985-02-10	1985-08-27
1986	1986-02-22	1986-09-11
1987	1987-04-08	1987-12-24
1988	1988-03-24	1988-09-22
1989	1989-01-15	1989-10-03
1990	1990-01-29	1990-09-24
1991	1991-02-26	1991-12-25
1992	1992-05-24	1992-11-08
1993	1993-03-19	1993-12-28
1994	1994-05-12	1994-10-14
1995	1995-02-24	1995-12-29
1996	1996-05-31	1996-12-01
1997	1997-02-21	1997-10-10
1998	1998-03-10	1998-09-02
1999	1999-01-26	1999-12-20
2000	2000-01-22	2000-11-08
2001	2001-05-30	2001-12-04
2002	2002-03-23	2002-11-01
2003	2003-02-17	2003-10-28
2004	2004-05-08	2004-08-25
2006	2006-01-08	2006-12-20
2007	2007-01-03	2007-12-17
2008	2008-02-08	2008-12-21
2009	2009-02-26	2009-08-15
2010	2010-03-23	2010-11-10
2011	2011-01-06	2011-12-13
2012	2012-05-05	2012-12-29
2013	2013-01-07	2013-09-23
2014	2014-05-08	2014-10-20
2015	2015-02-27	2015-12-05
2016	2016-01-19	2016-12-13
2017	2017-02-10	2017-09-25
2018	2018-01-16	2018-12-06
2019	2019-03-19	2019-10-05
2020	2020-03-15	2020-11-10
2021	2021-01-20	2021-11-22
2022	2022-05-12	2022-11-11
2023	2023-05-31	2023-11-14
2024	2024-05-29	2024-08-24
2025	2025-03-14	2025-11-23
2026	2026-03-28	2026-08-27

Every Fixed Threshold

Fixed thresholds at Riverdale
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	112	28	1926	9
25 mm (0.98 in): Days with 25 mm or more rain	89	8	1917	2
50 mm (1.97 in): Days with 50 mm or more rain	18	2	1982	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1955	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 Riverdale 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Riverdale Threshold Days by Year

Key Facts for Riverdale Thresholds

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

Every Fixed Threshold

Download the Data

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