Riverton Threshold Days by Year (ASN00023314)

4 fixed thresholds counted per year at Riverton (ASN00023314): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riverton Thresholds

Riverton: days with 10 mm (0.39 in) or more of precipitation in 109 years, most in 1917 with 25.
Riverton: days with 25 mm (0.98 in) or more of precipitation in 86 years, most in 1889 with 9.
Riverton: days with 50 mm (1.97 in) or more of precipitation in 17 years, most in 1889 with 2.
Riverton: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1889 with 1.
4 fixed thresholds have at least one qualifying day at Riverton.

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

109 years with a qualifying day

Days per year at Riverton with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 25 in 1917.

Days with 10 mm (0.39 in) or more of precipitation per year at Riverton
Year	Days	Decade average
1885	12	12
1886	10	12
1887	12	12
1888	8	12
1889	18	12
1890	24	9.9
1891	7	9.9
1892	7	9.9
1893	11	9.9
1894	4	9.9
1895	10	9.9
1896	6	9.9
1897	6	9.9
1898	15	9.9
1899	9	9.9
1900	12	13.4
1901	12	13.4
1902	12	13.4
1903	13	13.4
1904	10	13.4
1905	20	13.4
1906	14	13.4
1907	15	13.4
1908	8	13.4
1909	18	13.4
1910	20	14.6
1911	11	14.6
1912	10	14.6
1913	12	14.6
1914	5	14.6
1915	17	14.6
1916	22	14.6
1917	25	14.6
1918	10	14.6
1919	14	14.6
1920	13	13.4
1921	15	13.4
1922	15	13.4
1923	16	13.4
1925	8	13.4
1926	16	13.4
1927	16	13.4
1928	11	13.4
1929	11	13.4
1930	9	12.3
1931	12	12.3
1932	14	12.3
1933	14	12.3
1934	14	12.3
1935	10	12.3
1936	15	12.3
1937	17	12.3
1938	6	12.3
1939	12	12.3
1940	13	13
1941	16	13
1942	16	13
1943	11	13
1944	10	13
1945	15	13
1946	17	13
1947	17	13
1948	9	13
1949	6	13
1950	10	9.9
1951	9	9.9
1952	15	9.9
1953	12	9.9
1954	8	9.9
1955	14	9.9
1956	14	9.9
1957	4	9.9
1958	8	9.9
1959	5	9.9
1960	17	10.7
1961	11	10.7
1962	11	10.7
1963	9	10.7
1964	13	10.7
1965	8	10.7
1966	8	10.7
1967	4	10.7
1968	16	10.7
1969	10	10.7
1970	10	13.3
1971	13	13.3
1973	17	13.3
1999	7	7
2000	15	13.7
2002	8	13.7
2006	9	13.7
2007	14	13.7
2008	16	13.7
2009	20	13.7
2010	21	13.6
2011	17	13.6
2012	12	13.6
2013	14	13.6
2014	17	13.6
2015	13	13.6
2017	13	13.6
2018	10	13.6
2019	5	13.6
2020	13	11.2
2021	11	11.2
2022	21	11.2
2023	8	11.2
2024	6	11.2
2026	8	11.2

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

First to last qualifying date each year at Riverton
Year	First date	Last date
1885	1885-02-27	1885-12-23
1886	1886-01-06	1886-11-25
1887	1887-06-12	1887-12-02
1888	1888-05-03	1888-09-21
1889	1889-01-03	1889-11-15
1890	1890-01-26	1890-11-24
1891	1891-04-14	1891-12-12
1892	1892-01-23	1892-11-19
1893	1893-04-01	1893-10-14
1894	1894-04-19	1894-10-06
1895	1895-01-04	1895-12-07
1896	1896-01-14	1896-08-28
1897	1897-04-27	1897-09-29
1898	1898-02-26	1898-11-25
1899	1899-02-28	1899-09-10
1900	1900-04-03	1900-11-17
1901	1901-03-03	1901-10-28
1902	1902-02-01	1902-12-19
1903	1903-02-15	1903-12-24
1904	1904-01-03	1904-11-02
1905	1905-01-03	1905-10-30
1906	1906-03-24	1906-11-19
1907	1907-04-05	1907-12-28
1908	1908-01-31	1908-10-17
1909	1909-04-27	1909-10-01
1910	1910-03-05	1910-12-23
1911	1911-02-09	1911-12-04
1912	1912-06-14	1912-12-08
1913	1913-02-14	1913-12-23
1914	1914-03-13	1914-12-15
1915	1915-04-09	1915-12-05
1916	1916-01-04	1916-12-13
1917	1917-01-20	1917-12-12
1918	1918-03-05	1918-10-04
1919	1919-02-16	1919-12-27
1920	1920-03-07	1920-12-27
1921	1921-02-25	1921-12-03
1922	1922-01-05	1922-12-26
1923	1923-05-10	1923-12-18
1925	1925-04-05	1925-10-17
1926	1926-02-25	1926-10-12
1927	1927-02-03	1927-12-02
1928	1928-01-27	1928-10-06
1929	1929-05-06	1929-12-28
1930	1930-04-24	1930-10-24
1931	1931-03-13	1931-11-17
1932	1932-02-05	1932-12-15
1933	1933-03-04	1933-12-14
1934	1934-04-04	1934-12-09
1935	1935-03-14	1935-12-24
1936	1936-01-07	1936-12-16
1937	1937-01-19	1937-12-11
1938	1938-01-15	1938-10-23
1939	1939-02-25	1939-11-05
1940	1940-01-05	1940-12-19
1941	1941-01-24	1941-12-27
1942	1942-01-20	1942-11-05
1943	1943-02-17	1943-12-17
1944	1944-04-09	1944-12-21
1945	1945-01-10	1945-11-19
1946	1946-01-17	1946-12-26
1947	1947-02-05	1947-12-03
1948	1948-04-11	1948-12-25
1949	1949-02-27	1949-11-01
1950	1950-02-02	1950-09-01
1951	1951-02-21	1951-10-25
1952	1952-01-25	1952-11-27
1953	1953-05-19	1953-11-06
1954	1954-01-28	1954-12-24
1955	1955-02-08	1955-09-27
1956	1956-04-19	1956-10-18
1957	1957-06-19	1957-10-24
1958	1958-03-27	1958-10-16
1959	1959-02-06	1959-10-24
1960	1960-02-02	1960-11-12
1961	1961-02-08	1961-11-17
1962	1962-01-09	1962-12-29
1963	1963-05-15	1963-09-12
1964	1964-01-09	1964-12-23
1965	1965-05-08	1965-12-23
1966	1966-01-12	1966-12-01
1967	1967-02-23	1967-09-15
1968	1968-01-20	1968-12-03
1969	1969-01-14	1969-12-01
1970	1970-05-06	1970-12-11
1971	1971-03-15	1971-11-25
1973	1973-02-05	1973-12-31
1999	1999-05-25	1999-12-03
2000	2000-02-22	2000-11-20
2002	2002-01-22	2002-12-31
2006	2006-03-27	2006-12-22
2007	2007-01-19	2007-12-22
2008	2008-04-03	2008-12-14
2009	2009-03-04	2009-12-08
2010	2010-04-07	2010-12-08
2011	2011-02-18	2011-12-18
2012	2012-01-08	2012-10-12
2013	2013-02-28	2013-12-04
2014	2014-02-14	2014-11-21
2015	2015-01-10	2015-11-05
2017	2017-01-10	2017-12-02
2018	2018-04-15	2018-12-14
2019	2019-05-10	2019-09-21
2020	2020-02-01	2020-10-08
2021	2021-05-25	2021-11-24
2022	2022-01-24	2022-12-22
2023	2023-05-26	2023-12-11
2024	2024-06-01	2024-10-18
2026	2026-03-17	2026-10-02

Every Fixed Threshold

Fixed thresholds at Riverton
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	109	25	1917	8
25 mm (0.98 in): Days with 25 mm or more rain	86	9	1889	1
50 mm (1.97 in): Days with 50 mm or more rain	17	2	1889	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1889	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1885.

Download the Data

Data for Riverton 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).

Riverton Threshold Days by Year (ASN00023314)

Key Facts for Riverton Thresholds

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

Every Fixed Threshold

Download the Data

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