Tracy Threshold Days by Year (USC00218323)

18 fixed thresholds counted per year at Tracy (USC00218323): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tracy Thresholds

Tracy: days with a maximum temperature at or above 30 C (86 F) in 108 years, most in 1959 with 78.
Tracy: days with a maximum temperature at or above 90 F (32.2 C) in 108 years, most in 1959 with 55.
Tracy: days with a maximum temperature at or below 0 C (32 F) in 108 years, most in 2018 with 109.
Tracy: days with 10 mm (0.39 in) or more of precipitation in 107 years, most in 1993 with 36.
18 fixed thresholds have at least one qualifying day at Tracy.

Days at or above 30 C (86 F)

108 years with a qualifying day

Days per year at Tracy with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 78 in 1959.

Days at or above 30 C (86 F) per year at Tracy
Year	Days	Decade average
1914	63	38.7
1915	21	38.7
1916	45	38.7
1917	27	38.7
1918	36	38.7
1919	40	38.7
1920	32	38.6
1921	53	38.6
1922	50	38.6
1923	50	38.6
1924	21	38.6
1925	48	38.6
1926	44	38.6
1927	29	38.6
1928	25	38.6
1929	34	38.6
1930	49	55.9
1931	66	55.9
1932	42	55.9
1933	64	55.9
1934	70	55.9
1935	50	55.9
1936	55	55.9
1937	55	55.9
1938	49	55.9
1939	59	55.9
1940	45	43.3
1941	57	43.3
1942	24	43.3
1943	41	43.3
1944	32	43.3
1946	35	43.3
1947	57	43.3
1949	55	43.3
1950	40	55.6
1951	21	55.6
1952	72	55.6
1953	63	55.6
1954	59	55.6
1955	73	55.6
1956	48	55.6
1957	43	55.6
1958	59	55.6
1959	78	55.6
1960	50	37.3
1961	55	37.3
1962	20	37.3
1963	35	37.3
1964	47	37.3
1966	41	37.3
1967	35	37.3
1968	28	37.3
1969	25	37.3
1970	42	37.7
1971	26	37.7
1972	35	37.7
1973	40	37.7
1974	36	37.7
1975	45	37.7
1976	57	37.7
1977	34	37.7
1979	24	37.7
1980	44	34.6
1981	29	34.6
1982	20	34.6
1983	53	34.6
1984	24	34.6
1985	22	34.6
1986	22	34.6
1987	42	34.6
1988	61	34.6
1989	29	34.6
1990	35	25.5
1991	30	25.5
1992	13	25.5
1993	11	25.5
1994	17	25.5
1995	35	25.5
1996	18	25.5
1997	30	25.5
1998	28	25.5
1999	38	25.5
2000	22	29.3
2001	42	29.3
2002	47	29.3
2003	32	29.3
2004	19	29.3
2005	32	29.3
2006	26	29.3
2007	35	29.3
2008	21	29.3
2009	17	29.3
2010	36	27.3
2012	47	27.3
2013	33	27.3
2014	12	27.3
2015	23	27.3
2016	22	27.3
2017	21	27.3
2018	30	27.3
2019	22	27.3
2020	37	39
2021	48	39
2022	37	39
2023	48	39
2024	30	39
2025	38	39
2026	35	39

For each year, a bar from the first to the last day at Tracy meeting 30 C (86 F).

First to last qualifying date each year at Tracy
Year	First date	Last date
1914	1914-04-16	1914-09-18
1915	1915-05-11	1915-09-07
1916	1916-05-05	1916-09-05
1917	1917-05-18	1917-08-26
1918	1918-05-03	1918-08-27
1919	1919-05-28	1919-09-19
1920	1920-05-24	1920-09-25
1921	1921-05-21	1921-09-01
1922	1922-06-04	1922-10-04
1923	1923-06-01	1923-09-26
1924	1924-04-24	1924-09-03
1925	1925-05-19	1925-09-19
1926	1926-04-20	1926-09-07
1927	1927-06-08	1927-10-26
1928	1928-05-08	1928-10-10
1929	1929-04-04	1929-09-23
1930	1930-05-20	1930-09-22
1931	1931-04-08	1931-09-20
1932	1932-05-13	1932-09-18
1933	1933-05-16	1933-09-25
1934	1934-04-28	1934-10-11
1935	1935-06-13	1935-09-24
1936	1936-05-05	1936-10-05
1937	1937-05-29	1937-09-23
1938	1938-05-02	1938-10-03
1939	1939-05-04	1939-10-06
1940	1940-05-12	1940-09-19
1941	1941-05-14	1941-09-20
1942	1942-06-04	1942-09-11
1943	1943-05-28	1943-08-31
1944	1944-05-15	1944-09-17
1946	1946-06-06	1946-09-05
1947	1947-06-26	1947-10-21
1949	1949-05-03	1949-09-03
1950	1950-05-22	1950-10-30
1951	1951-06-16	1951-10-02
1952	1952-04-27	1952-09-30
1953	1953-05-25	1953-10-15
1954	1954-04-14	1954-09-26
1955	1955-05-02	1955-10-10
1956	1956-05-20	1956-09-28
1957	1957-06-04	1957-09-01
1958	1958-05-10	1958-10-16
1959	1959-05-01	1959-09-14
1960	1960-04-22	1960-09-07
1961	1961-05-11	1961-10-16
1962	1962-04-24	1962-08-28
1963	1963-05-08	1963-10-06
1964	1964-04-17	1964-09-10
1966	1966-05-23	1966-09-01
1967	1967-05-25	1967-10-02
1968	1968-04-30	1968-08-24
1969	1969-05-26	1969-08-30
1970	1970-04-29	1970-09-21
1971	1971-05-15	1971-09-08
1972	1972-05-17	1972-09-20
1973	1973-05-22	1973-09-11
1974	1974-06-04	1974-09-27
1975	1975-05-18	1975-09-11
1976	1976-06-06	1976-10-01
1977	1977-04-10	1977-09-09
1979	1979-05-29	1979-09-05
1980	1980-04-21	1980-10-08
1981	1981-04-28	1981-09-11
1982	1982-06-28	1982-08-20
1983	1983-05-28	1983-09-28
1984	1984-06-06	1984-09-20
1985	1985-04-18	1985-08-09
1986	1986-05-31	1986-08-17
1987	1987-04-20	1987-10-05
1988	1988-05-13	1988-09-18
1989	1989-05-24	1989-09-18
1990	1990-04-23	1990-09-27
1991	1991-05-15	1991-09-07
1992	1992-05-01	1992-10-03
1993	1993-06-12	1993-10-07
1994	1994-05-19	1994-09-15
1995	1995-06-15	1995-09-05
1996	1996-05-18	1996-08-26
1997	1997-06-15	1997-10-04
1998	1998-05-05	1998-09-20
1999	1999-05-29	1999-09-04
2000	2000-05-05	2000-09-18
2001	2001-05-09	2001-10-02
2002	2002-04-15	2002-09-16
2003	2003-04-14	2003-09-07
2004	2004-04-18	2004-09-19
2005	2005-06-07	2005-10-02
2006	2006-05-24	2006-10-02
2007	2007-04-30	2007-10-07
2008	2008-05-25	2008-09-27
2009	2009-04-24	2009-08-15
2010	2010-05-23	2010-10-09
2012	2012-05-18	2012-09-12
2013	2013-05-15	2013-09-19
2014	2014-05-30	2014-08-22
2015	2015-06-10	2015-10-12
2016	2016-05-07	2016-08-29
2017	2017-05-09	2017-09-25
2018	2018-05-18	2018-09-17
2019	2019-06-01	2019-09-21
2020	2020-06-02	2020-08-27
2021	2021-05-02	2021-09-29
2022	2022-05-13	2022-09-21
2023	2023-04-14	2023-10-03
2024	2024-05-13	2024-09-30
2025	2025-05-10	2025-10-05
2026	2026-04-23	2026-09-01

Every Fixed Threshold

Fixed thresholds at Tracy
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	108	78	1959	35
35 C (95 F): Days	93	31	1955	2
40 C (104 F): Days	13	6	1936	2
90 F (32.2 C): Days	108	55	1959	15
100 F (37.8 C): Days	36	14	1955	1
0 C (32 F): Ice days (max	108	109	2018	36
0 C (32 F): Frost days (min	103	188	2013	92
-10 C (14 F): Days with min	103	104	1950	40
-20 C (-4 F): Days with min	103	48	1936	7
-30 C (-22 F): Days with min	50	10	1936	1
20 C (68 F): Tropical nights (min	103	27	1937	30
25 C (77 F): Days with min	27	5	1940	1
10 mm (0.39 in): Days with 10 mm or more rain	107	36	1993	15
25 mm (0.98 in): Days with 25 mm or more rain	107	13	2018	4
50 mm (1.97 in): Days with 50 mm or more rain	65	4	1968	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1996	1
10 cm (3.9 in): Days with 10 cm or more snowfall	81	9	2013	1
25 cm (9.8 in): Days with 25 cm or more snowfall	31	2	1951	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1914.

Download the Data

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

Tracy Threshold Days by Year (USC00218323)

Key Facts for Tracy Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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