Riverton Threshold Days by Year (USC00447254)

6 fixed thresholds counted per year at Riverton (USC00447254): 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 56 years, most in 1906 with 52.
Riverton: days with 25 mm (0.98 in) or more of precipitation in 53 years, most in 1906 with 15.
Riverton: days with 50 mm (1.97 in) or more of precipitation in 39 years, most in 1893 with 4.
Riverton: days with 10 cm (3.9 in) or more of snowfall in 22 years, most in 1902 with 4.
6 fixed thresholds have at least one qualifying day at Riverton.

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

56 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 52 in 1906.

Days with 10 mm (0.39 in) or more of precipitation per year at Riverton
Year	Days	Decade average
1893	21	21
1902	34	31
1903	25	31
1904	24	31
1905	35	31
1906	52	31
1907	31	31
1909	16	31
1910	25	23.4
1911	23	23.4
1912	20	23.4
1913	17	23.4
1914	22	23.4
1915	23	23.4
1916	15	23.4
1917	18	23.4
1918	37	23.4
1919	34	23.4
1921	26	17.6
1922	12	17.6
1923	11	17.6
1926	18	17.6
1929	21	17.6
1931	27	30
1935	25	30
1936	35	30
1937	39	30
1938	27	30
1939	27	30
1946	21	26.5
1949	32	26.5
1950	33	31.1
1951	31	31.1
1952	35	31.1
1953	32	31.1
1954	33	31.1
1955	24	31.1
1956	30	31.1
1957	28	31.1
1958	37	31.1
1959	28	31.1
1960	29	30.7
1961	39	30.7
1962	36	30.7
1963	27	30.7
1965	22	30.7
1966	28	30.7
1967	29	30.7
1968	29	30.7
1969	37	30.7
1970	35	35.2
1973	37	35.2
1974	35	35.2
1975	40	35.2
1976	34	35.2
1977	30	35.2

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
1893	1893-01-01	1893-11-28
1902	1902-01-22	1902-12-16
1903	1903-01-03	1903-10-08
1904	1904-01-29	1904-12-27
1905	1905-01-03	1905-12-29
1906	1906-01-04	1906-12-21
1907	1907-01-09	1907-12-21
1909	1909-03-03	1909-12-26
1910	1910-01-07	1910-12-07
1911	1911-01-02	1911-12-29
1912	1912-01-09	1912-09-25
1913	1913-01-03	1913-12-26
1914	1914-01-04	1914-12-07
1915	1915-01-07	1915-12-26
1916	1916-03-28	1916-12-22
1917	1917-03-04	1917-10-30
1918	1918-02-20	1918-12-25
1919	1919-01-01	1919-12-09
1921	1921-01-15	1921-12-03
1922	1922-02-02	1922-10-11
1923	1923-01-01	1923-12-31
1926	1926-02-01	1926-12-26
1929	1929-02-07	1929-12-24
1931	1931-01-06	1931-10-29
1935	1935-01-21	1935-12-14
1936	1936-01-03	1936-12-20
1937	1937-01-03	1937-11-28
1938	1938-02-20	1938-12-27
1939	1939-01-14	1939-12-20
1946	1946-01-21	1946-12-21
1949	1949-01-06	1949-12-27
1950	1950-01-13	1950-12-11
1951	1951-01-15	1951-12-21
1952	1952-01-05	1952-11-22
1953	1953-01-01	1953-12-14
1954	1954-01-11	1954-12-30
1955	1955-02-07	1955-11-11
1956	1956-01-11	1956-12-23
1957	1957-01-10	1957-12-26
1958	1958-01-14	1958-12-30
1959	1959-01-02	1959-12-29
1960	1960-01-03	1960-11-30
1961	1961-01-01	1961-12-28
1962	1962-01-06	1962-12-30
1963	1963-01-13	1963-12-25
1965	1965-01-02	1965-10-07
1966	1966-01-02	1966-12-29
1967	1967-01-27	1967-12-11
1968	1968-03-01	1968-11-19
1969	1969-01-22	1969-12-31
1970	1970-01-01	1970-11-20
1973	1973-01-27	1973-12-27
1974	1974-01-11	1974-12-16
1975	1975-01-07	1975-12-09
1976	1976-01-01	1976-12-07
1977	1977-03-12	1977-12-18

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	56	52	1906	30
25 mm (0.98 in): Days with 25 mm or more rain	53	15	1906	12
50 mm (1.97 in): Days with 50 mm or more rain	39	4	1893	2
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1903	1
10 cm (3.9 in): Days with 10 cm or more snowfall	22	4	1902	3
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1941	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 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Riverton Threshold Days by Year (USC00447254)

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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