American River Threshold Days by Year

3 fixed thresholds counted per year at American River (ASN00022800): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for American River Thresholds

American River: days with 10 mm (0.39 in) or more of precipitation in 107 years, most in 1922 with 27.
American River: days with 25 mm (0.98 in) or more of precipitation in 85 years, most in 1890 with 4.
American River: days with 50 mm (1.97 in) or more of precipitation in 11 years, most in 2011 with 2.
3 fixed thresholds have at least one qualifying day at American River.

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

107 years with a qualifying day

Days per year at American River with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 27 in 1922.

Days with 10 mm (0.39 in) or more of precipitation per year at American River
Year	Days	Decade average
1884	11	13.5
1885	16	13.5
1886	10	13.5
1887	23	13.5
1888	5	13.5
1889	16	13.5
1890	22	13.8
1891	9	13.8
1892	14	13.8
1893	13	13.8
1894	16	13.8
1895	15	13.8
1896	13	13.8
1897	11	13.8
1898	11	13.8
1911	12	12.2
1912	12	12.2
1913	7	12.2
1914	8	12.2
1915	13	12.2
1916	14	12.2
1917	19	12.2
1918	13	12.2
1919	12	12.2
1920	22	14.9
1921	16	14.9
1922	27	14.9
1923	13	14.9
1924	5	14.9
1925	12	14.9
1926	17	14.9
1927	12	14.9
1928	10	14.9
1929	15	14.9
1930	13	14
1931	21	14
1932	15	14
1933	10	14
1934	15	14
1935	20	14
1936	7	14
1937	12	14
1938	13	14
1940	11	9.3
1944	10	9.3
1945	5	9.3
1946	11	9.3
1950	12	12.6
1951	13	12.6
1952	12	12.6
1953	13	12.6
1954	13	12.6
1960	16	12.6
1961	5	12.6
1962	4	12.6
1963	18	12.6
1964	19	12.6
1965	12	12.6
1966	13	12.6
1967	7	12.6
1968	19	12.6
1969	13	12.6
1970	13	16.9
1971	18	16.9
1972	17	16.9
1973	18	16.9
1974	21	16.9
1975	15	16.9
1976	16	16.9
1977	13	16.9
1978	21	16.9
1979	17	16.9
1980	14	14.6
1981	10	14.6
1983	18	14.6
1986	14	14.6
1987	12	14.6
1988	18	14.6
1989	16	14.6
1990	14	13.3
1991	13	13.3
1992	20	13.3
1993	12	13.3
1994	10	13.3
1995	13	13.3
1996	11	13.3
1997	17	13.3
1998	13	13.3
1999	10	13.3
2000	19	12.8
2001	17	12.8
2002	10	12.8
2003	17	12.8
2004	12	12.8
2005	12	12.8
2006	9	12.8
2007	11	12.8
2008	10	12.8
2009	11	12.8
2010	19	15.1
2011	10	15.1
2012	18	15.1
2013	22	15.1
2014	13	15.1
2015	9	15.1
2016	21	15.1
2018	9	15.1

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

First to last qualifying date each year at American River
Year	First date	Last date
1884	1884-05-11	1884-10-09
1885	1885-02-14	1885-12-22
1886	1886-04-03	1886-10-01
1887	1887-02-16	1887-12-13
1888	1888-05-10	1888-08-16
1889	1889-01-01	1889-11-14
1890	1890-01-27	1890-11-13
1891	1891-01-04	1891-12-11
1892	1892-01-21	1892-12-10
1893	1893-04-01	1893-09-24
1894	1894-03-23	1894-12-25
1895	1895-01-03	1895-08-18
1896	1896-01-16	1896-12-26
1897	1897-05-23	1897-10-23
1898	1898-04-02	1898-08-29
1911	1911-02-07	1911-10-31
1912	1912-02-23	1912-12-03
1913	1913-01-03	1913-12-24
1914	1914-03-12	1914-11-24
1915	1915-04-11	1915-09-29
1916	1916-02-09	1916-10-21
1917	1917-02-14	1917-12-12
1918	1918-05-10	1918-08-22
1919	1919-01-07	1919-12-17
1920	1920-04-14	1920-11-27
1921	1921-05-23	1921-11-25
1922	1922-01-06	1922-12-08
1923	1923-05-05	1923-12-14
1924	1924-03-27	1924-11-07
1925	1925-04-02	1925-11-18
1926	1926-04-23	1926-12-05
1927	1927-01-05	1927-11-01
1928	1928-02-02	1928-10-13
1929	1929-04-24	1929-10-08
1930	1930-02-21	1930-10-05
1931	1931-04-18	1931-12-22
1932	1932-02-05	1932-10-12
1933	1933-01-20	1933-09-17
1934	1934-03-29	1934-11-06
1935	1935-03-24	1935-11-27
1936	1936-06-01	1936-12-03
1937	1937-04-27	1937-12-10
1938	1938-02-19	1938-08-28
1940	1940-01-05	1940-11-21
1944	1944-04-01	1944-12-21
1945	1945-06-20	1945-07-13
1946	1946-01-17	1946-09-11
1950	1950-05-13	1950-12-20
1951	1951-05-13	1951-10-24
1952	1952-01-24	1952-11-27
1953	1953-06-10	1953-11-15
1954	1954-04-06	1954-12-12
1960	1960-02-02	1960-09-13
1961	1961-04-06	1961-09-13
1962	1962-03-28	1962-11-07
1963	1963-04-25	1963-10-28
1964	1964-02-01	1964-12-23
1965	1965-03-12	1965-11-24
1966	1966-03-16	1966-12-04
1967	1967-02-23	1967-12-12
1968	1968-03-29	1968-12-22
1969	1969-02-08	1969-11-04
1970	1970-01-01	1970-12-10
1971	1971-04-15	1971-12-10
1972	1972-01-08	1972-11-02
1973	1973-03-18	1973-12-15
1974	1974-01-28	1974-10-31
1975	1975-01-25	1975-12-14
1976	1976-01-09	1976-12-23
1977	1977-01-15	1977-11-28
1978	1978-04-09	1978-12-04
1979	1979-02-24	1979-11-15
1980	1980-04-18	1980-12-16
1981	1981-03-01	1981-10-03
1983	1983-02-17	1983-12-06
1986	1986-04-24	1986-12-16
1987	1987-05-02	1987-12-01
1988	1988-01-14	1988-12-05
1989	1989-04-26	1989-08-29
1990	1990-02-09	1990-12-06
1991	1991-04-25	1991-09-26
1992	1992-03-01	1992-12-25
1993	1993-05-08	1993-11-02
1994	1994-05-09	1994-11-02
1995	1995-01-14	1995-09-24
1996	1996-02-08	1996-09-29
1997	1997-01-15	1997-12-09
1998	1998-04-12	1998-12-20
1999	1999-03-07	1999-12-03
2000	2000-01-25	2000-10-19
2001	2001-02-13	2001-11-23
2002	2002-04-13	2002-11-26
2003	2003-01-30	2003-12-20
2004	2004-03-06	2004-09-08
2005	2005-01-04	2005-11-07
2006	2006-01-29	2006-07-15
2007	2007-01-20	2007-12-22
2008	2008-02-20	2008-12-13
2009	2009-04-24	2009-12-17
2010	2010-01-12	2010-12-08
2011	2011-02-19	2011-12-18
2012	2012-03-15	2012-10-11
2013	2013-04-21	2013-12-05
2014	2014-01-02	2014-12-11
2015	2015-01-13	2015-11-04
2016	2016-01-30	2016-12-28
2018	2018-05-03	2018-11-25

Every Fixed Threshold

Fixed thresholds at American River
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	107	27	1922	9
25 mm (0.98 in): Days with 25 mm or more rain	85	4	1890	1
50 mm (1.97 in): Days with 50 mm or more rain	11	2	2011	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1884.

Download the Data

Data for American River 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).

American River Threshold Days by Year

Key Facts for American River Thresholds

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

Every Fixed Threshold

Download the Data

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