Onaka Threshold Days by Year (USC00396282)

7 fixed thresholds counted per year at Onaka (USC00396282): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Onaka Thresholds

Onaka: days with 10 mm (0.39 in) or more of precipitation in 89 years, most in 1921 with 26.
Onaka: days with 25 mm (0.98 in) or more of precipitation in 82 years, most in 1932 with 11.
Onaka: days with 10 cm (3.9 in) or more of snowfall in 51 years, most in 1993 with 6.
Onaka: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 1964 with 3.
7 fixed thresholds have at least one qualifying day at Onaka.

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

89 years with a qualifying day

Days per year at Onaka with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 26 in 1921.

Days with 10 mm (0.39 in) or more of precipitation per year at Onaka
Year	Days	Decade average
1912	19	19.8
1914	25	19.8
1916	22	19.8
1917	16	19.8
1918	19	19.8
1919	18	19.8
1921	26	16.1
1922	16	16.1
1923	18	16.1
1924	10	16.1
1925	13	16.1
1926	13	16.1
1927	20	16.1
1928	19	16.1
1929	10	16.1
1931	11	12.5
1932	20	12.5
1934	7	12.5
1935	19	12.5
1936	8	12.5
1937	11	12.5
1938	10	12.5
1939	14	12.5
1940	13	13.7
1941	11	13.7
1942	14	13.7
1943	14	13.7
1944	17	13.7
1945	13	13.7
1946	17	13.7
1947	11	13.7
1948	15	13.7
1949	12	13.7
1950	6	12.1
1951	13	12.1
1952	7	12.1
1953	19	12.1
1954	11	12.1
1955	8	12.1
1956	13	12.1
1957	22	12.1
1958	12	12.1
1959	10	12.1
1960	11	13.3
1961	10	13.3
1963	14	13.3
1964	15	13.3
1965	16	13.3
1966	10	13.3
1967	13	13.3
1968	21	13.3
1969	10	13.3
1971	13	11.8
1972	10	11.8
1974	10	11.8
1975	14	11.8
1976	5	11.8
1977	17	11.8
1978	14	11.8
1979	11	11.8
1980	12	13.8
1981	9	13.8
1982	15	13.8
1983	21	13.8
1984	24	13.8
1985	12	13.8
1987	9	13.8
1988	11	13.8
1989	11	13.8
1990	17	17.4
1991	21	17.4
1992	13	17.4
1993	22	17.4
1994	16	17.4
1995	19	17.4
1996	19	17.4
1997	14	17.4
1998	21	17.4
1999	12	17.4
2000	11	16
2001	16	16
2002	14	16
2003	17	16
2004	18	16
2006	12	16
2007	18	16
2009	22	16
2010	14	11
2012	8	11

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

First to last qualifying date each year at Onaka
Year	First date	Last date
1912	1912-02-03	1912-09-28
1914	1914-01-02	1914-10-11
1916	1916-01-11	1916-12-26
1917	1917-01-21	1917-09-23
1918	1918-02-14	1918-12-22
1919	1919-02-19	1919-11-11
1921	1921-03-23	1921-10-25
1922	1922-01-31	1922-11-12
1923	1923-04-06	1923-10-10
1924	1924-04-15	1924-10-04
1925	1925-04-08	1925-11-03
1926	1926-05-08	1926-10-04
1927	1927-04-04	1927-12-03
1928	1928-04-21	1928-11-14
1929	1929-01-30	1929-10-11
1931	1931-04-19	1931-12-31
1932	1932-04-23	1932-10-19
1934	1934-03-29	1934-10-16
1935	1935-03-04	1935-08-29
1936	1936-03-23	1936-08-27
1937	1937-02-07	1937-09-02
1938	1938-04-26	1938-09-07
1939	1939-01-09	1939-10-09
1940	1940-02-11	1940-10-31
1941	1941-04-09	1941-10-02
1942	1942-03-25	1942-09-01
1943	1943-05-30	1943-10-31
1944	1944-01-27	1944-11-25
1945	1945-04-10	1945-09-19
1946	1946-03-16	1946-11-07
1947	1947-04-22	1947-11-15
1948	1948-04-20	1948-10-07
1949	1949-01-04	1949-12-11
1950	1950-03-26	1950-09-10
1951	1951-02-28	1951-12-06
1952	1952-06-15	1952-11-18
1953	1953-01-15	1953-09-24
1954	1954-03-24	1954-10-26
1955	1955-04-04	1955-12-03
1956	1956-03-27	1956-11-02
1957	1957-04-04	1957-11-01
1958	1958-02-27	1958-08-30
1959	1959-05-05	1959-09-25
1960	1960-04-23	1960-11-28
1961	1961-04-23	1961-09-19
1963	1963-04-03	1963-10-21
1964	1964-04-12	1964-08-09
1965	1965-04-03	1965-12-11
1966	1966-06-05	1966-10-14
1967	1967-04-13	1967-12-21
1968	1968-03-19	1968-10-17
1969	1969-02-27	1969-09-17
1971	1971-04-21	1971-11-16
1972	1972-05-01	1972-10-05
1974	1974-04-11	1974-08-24
1975	1975-03-26	1975-10-24
1976	1976-04-16	1976-09-20
1977	1977-02-23	1977-11-20
1978	1978-04-18	1978-08-28
1979	1979-03-19	1979-10-31
1980	1980-02-04	1980-10-16
1981	1981-03-29	1981-11-30
1982	1982-01-02	1982-11-09
1983	1983-03-05	1983-11-08
1984	1984-03-04	1984-12-01
1985	1985-04-20	1985-10-12
1987	1987-02-27	1987-08-12
1988	1988-04-21	1988-09-28
1989	1989-01-07	1989-10-29
1990	1990-03-14	1990-10-17
1991	1991-02-18	1991-10-28
1992	1992-05-22	1992-11-01
1993	1993-04-07	1993-11-24
1994	1994-02-26	1994-12-14
1995	1995-03-27	1995-10-05
1996	1996-02-27	1996-12-18
1997	1997-02-03	1997-10-12
1998	1998-03-29	1998-11-10
1999	1999-03-28	1999-09-03
2000	2000-02-26	2000-11-01
2001	2001-04-07	2001-10-10
2002	2002-03-09	2002-09-28
2003	2003-02-02	2003-12-27
2004	2004-03-01	2004-10-30
2006	2006-04-06	2006-12-30
2007	2007-03-03	2007-12-01
2009	2009-02-09	2009-10-29
2010	2010-01-23	2010-12-31
2012	2012-04-12	2012-08-10

Every Fixed Threshold

Fixed thresholds at Onaka
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	89	26	1921	8
25 mm (0.98 in): Days with 25 mm or more rain	82	11	1932	2
50 mm (1.97 in): Days with 50 mm or more rain	42	3	1964	1
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	51	6	1993	1
25 cm (9.8 in): Days with 25 cm or more snowfall	8	2	1997	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1997	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

Data for Onaka 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).

Onaka Threshold Days by Year (USC00396282)

Key Facts for Onaka Thresholds

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

Every Fixed Threshold

Download the Data

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