Grass Valley Threshold Days by Year

4 fixed thresholds counted per year at Grass Valley (ASN00010150): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grass Valley Thresholds

Grass Valley: days with 10 mm (0.39 in) or more of precipitation in 104 years, most in 1964 with 22.
Grass Valley: days with 25 mm (0.98 in) or more of precipitation in 86 years, most in 1917 with 7.
Grass Valley: days with 50 mm (1.97 in) or more of precipitation in 16 years, most in 1967 with 2.
Grass Valley: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1934 with 1.
4 fixed thresholds have at least one qualifying day at Grass Valley.

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

104 years with a qualifying day

Days per year at Grass Valley with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 22 in 1964.

Days with 10 mm (0.39 in) or more of precipitation per year at Grass Valley
Year	Days	Decade average
1907	16	17
1908	14	17
1909	21	17
1910	21	14.8
1911	13	14.8
1912	17	14.8
1913	11	14.8
1914	5	14.8
1915	20	14.8
1916	12	14.8
1917	20	14.8
1918	14	14.8
1921	11	13.7
1922	16	13.7
1923	19	13.7
1924	12	13.7
1925	10	13.7
1926	19	13.7
1927	9	13.7
1931	11	12.8
1932	19	12.8
1933	12	12.8
1934	17	12.8
1935	9	12.8
1936	9	12.8
1937	8	12.8
1938	11	12.8
1939	19	12.8
1940	9	9.6
1941	7	9.6
1942	11	9.6
1943	12	9.6
1944	4	9.6
1945	13	9.6
1946	13	9.6
1947	12	9.6
1948	9	9.6
1949	6	9.6
1950	8	10.7
1951	10	10.7
1952	10	10.7
1953	13	10.7
1954	6	10.7
1955	16	10.7
1956	8	10.7
1957	12	10.7
1958	16	10.7
1959	8	10.7
1960	18	14
1961	10	14
1962	14	14
1963	18	14
1964	22	14
1965	14	14
1966	16	14
1967	8	14
1968	16	14
1969	4	14
1970	10	11.1
1971	11	11.1
1972	5	11.1
1973	12	11.1
1974	16	11.1
1975	13	11.1
1976	13	11.1
1977	9	11.1
1978	12	11.1
1979	10	11.1
1980	7	10.1
1981	11	10.1
1982	13	10.1
1983	18	10.1
1984	9	10.1
1985	6	10.1
1986	8	10.1
1987	13	10.1
1988	9	10.1
1989	7	10.1
1990	12	12.3
1991	15	12.3
1992	12	12.3
1993	11	12.3
1994	10	12.3
1995	15	12.3
1996	11	12.3
1997	10	12.3
1998	8	12.3
1999	19	12.3
2000	9	8
2001	7	8
2002	6	8
2003	14	8
2004	10	8
2005	5	8
2006	10	8
2007	6	8
2009	5	8
2012	9	7.7
2014	7	7.7
2019	7	7.7
2023	4	6.5
2024	10	6.5
2025	7	6.5
2026	5	6.5

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

First to last qualifying date each year at Grass Valley
Year	First date	Last date
1907	1907-03-08	1907-10-05
1908	1908-04-05	1908-11-09
1909	1909-01-06	1909-09-28
1910	1910-04-13	1910-09-03
1911	1911-03-15	1911-07-31
1912	1912-02-13	1912-12-28
1913	1913-06-10	1913-12-20
1914	1914-02-17	1914-11-15
1915	1915-01-15	1915-10-11
1916	1916-02-15	1916-10-07
1917	1917-03-18	1917-11-17
1918	1918-01-20	1918-10-17
1921	1921-02-16	1921-10-29
1922	1922-02-24	1922-09-18
1923	1923-01-19	1923-12-22
1924	1924-05-14	1924-11-03
1925	1925-01-24	1925-09-24
1926	1926-02-05	1926-11-19
1927	1927-03-13	1927-09-19
1931	1931-05-04	1931-09-05
1932	1932-04-06	1932-10-21
1933	1933-02-03	1933-10-06
1934	1934-03-08	1934-08-27
1935	1935-01-06	1935-10-21
1936	1936-05-22	1936-12-24
1937	1937-04-11	1937-11-24
1938	1938-03-13	1938-09-02
1939	1939-01-24	1939-11-02
1940	1940-01-23	1940-12-03
1941	1941-04-27	1941-09-19
1942	1942-03-18	1942-12-21
1943	1943-01-31	1943-08-02
1944	1944-05-18	1944-08-11
1945	1945-03-26	1945-08-08
1946	1946-05-07	1946-11-11
1947	1947-02-26	1947-10-25
1948	1948-06-05	1948-11-15
1949	1949-06-04	1949-11-05
1950	1950-05-09	1950-09-13
1951	1951-01-17	1951-08-05
1952	1952-05-05	1952-12-18
1953	1953-03-25	1953-10-03
1954	1954-05-23	1954-09-29
1955	1955-02-06	1955-12-28
1956	1956-05-22	1956-11-29
1957	1957-01-20	1957-09-04
1958	1958-01-13	1958-11-25
1959	1959-06-01	1959-12-31
1960	1960-03-27	1960-09-12
1961	1961-01-26	1961-08-31
1962	1962-05-13	1962-11-09
1963	1963-02-17	1963-09-18
1964	1964-03-28	1964-09-27
1965	1965-03-26	1965-12-27
1966	1966-01-23	1966-10-23
1967	1967-05-09	1967-07-27
1968	1968-01-27	1968-09-10
1969	1969-05-18	1969-09-27
1970	1970-02-16	1970-10-04
1971	1971-03-13	1971-09-30
1972	1972-03-02	1972-08-17
1973	1973-06-06	1973-09-25
1974	1974-04-03	1974-11-18
1975	1975-04-01	1975-09-16
1976	1976-01-07	1976-11-07
1977	1977-04-27	1977-12-28
1978	1978-02-15	1978-12-19
1979	1979-03-14	1979-08-19
1980	1980-02-24	1980-10-16
1981	1981-02-18	1981-11-12
1982	1982-01-21	1982-11-27
1983	1983-03-17	1983-12-31
1984	1984-03-04	1984-09-14
1985	1985-06-05	1985-09-22
1986	1986-02-21	1986-10-13
1987	1987-04-22	1987-12-24
1988	1988-03-24	1988-12-03
1989	1989-01-12	1989-08-18
1990	1990-01-27	1990-10-13
1991	1991-01-17	1991-12-25
1992	1992-02-09	1992-11-15
1993	1993-03-19	1993-12-28
1994	1994-05-23	1994-10-14
1995	1995-02-24	1995-10-18
1996	1996-06-18	1996-11-06
1997	1997-03-29	1997-09-06
1998	1998-04-16	1998-11-14
1999	1999-03-13	1999-12-30
2000	2000-01-15	2000-08-31
2001	2001-05-06	2001-11-19
2002	2002-01-15	2002-09-15
2003	2003-02-10	2003-12-06
2004	2004-05-16	2004-10-21
2005	2005-03-28	2005-08-18
2006	2006-01-03	2006-12-20
2007	2007-03-18	2007-12-17
2009	2009-05-22	2009-11-13
2012	2012-01-01	2012-12-14
2014	2014-05-08	2014-10-26
2019	2019-02-15	2019-08-23
2023	2023-03-30	2023-07-26
2024	2024-05-29	2024-11-21
2025	2025-03-14	2025-10-20
2026	2026-02-10	2026-08-27

Every Fixed Threshold

Fixed thresholds at Grass Valley
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	104	22	1964	5
25 mm (0.98 in): Days with 25 mm or more rain	86	7	1917	1
50 mm (1.97 in): Days with 50 mm or more rain	16	2	1967	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1934	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

Download the Data

Data for Grass Valley 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Grass Valley Threshold Days by Year

Key Facts for Grass Valley Thresholds

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

Every Fixed Threshold

Download the Data

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