San Jacinto Threshold Days by Year (USC00047810)

15 fixed thresholds counted per year at San Jacinto (USC00047810): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Jacinto Thresholds

San Jacinto: days with a maximum temperature at or above 30 C (86 F) in 80 years, most in 1934 with 178.
San Jacinto: days with a maximum temperature at or above 35 C (95 F) in 80 years, most in 1962 with 110.
San Jacinto: days with a maximum temperature at or above 90 F (32.2 C) in 80 years, most in 1962 with 146.
San Jacinto: days with a maximum temperature at or above 100 F (37.8 C) in 80 years, most in 1964 with 74.
15 fixed thresholds have at least one qualifying day at San Jacinto.

Days at or above 30 C (86 F)

80 years with a qualifying day

Days per year at San Jacinto with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 178 in 1934.

Days at or above 30 C (86 F) per year at San Jacinto
Year	Days	Decade average
1893	123	137.3
1894	163	137.3
1895	135	137.3
1896	128	137.3
1900	136	130
1901	131	130
1902	132	130
1903	126	130
1905	65	130
1906	144	130
1907	135	130
1908	156	130
1909	145	130
1910	177	145
1911	142	145
1912	115	145
1913	152	145
1914	125	145
1915	148	145
1916	169	145
1917	163	145
1918	132	145
1919	127	145
1920	105	139.6
1921	116	139.6
1922	147	139.6
1923	121	139.6
1924	155	139.6
1925	120	139.6
1926	168	139.6
1927	163	139.6
1928	158	139.6
1929	143	139.6
1930	145	154.3
1931	158	154.3
1932	136	154.3
1933	159	154.3
1934	178	154.3
1935	139	154.3
1936	151	154.3
1937	164	154.3
1938	150	154.3
1939	163	154.3
1940	151	128.6
1941	120	128.6
1942	123	128.6
1943	138	128.6
1944	104	128.6
1945	117	128.6
1946	102	128.6
1947	141	128.6
1949	161	128.6
1950	156	136.6
1951	145	136.6
1952	145	136.6
1953	116	136.6
1954	129	136.6
1955	117	136.6
1956	141	136.6
1957	121	136.6
1958	152	136.6
1959	144	136.6
1960	164	151.9
1961	143	151.9
1962	171	151.9
1963	134	151.9
1964	162	151.9
1965	150	151.9
1966	158	151.9
1967	154	151.9
1968	142	151.9
1969	141	151.9
1970	152	146
1971	145	146
1972	147	146
1973	153	146
1974	147	146
1975	141	146
1976	132	146
1977	151	146

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

First to last qualifying date each year at San Jacinto
Year	First date	Last date
1893	1893-03-27	1893-10-14
1894	1894-03-12	1894-11-26
1895	1895-03-24	1895-11-19
1896	1896-03-24	1896-10-16
1900	1900-02-22	1900-11-12
1901	1901-02-28	1901-10-22
1902	1902-04-12	1902-10-19
1903	1903-05-13	1903-11-21
1905	1905-07-02	1905-10-29
1906	1906-04-18	1906-12-21
1907	1907-02-06	1907-12-23
1908	1908-02-14	1908-11-11
1909	1909-04-01	1909-11-20
1910	1910-01-22	1910-11-10
1911	1911-01-22	1911-12-02
1912	1912-01-13	1912-11-27
1913	1913-01-02	1913-11-09
1914	1914-03-16	1914-11-05
1915	1915-03-15	1915-12-23
1916	1916-02-12	1916-11-10
1917	1917-02-05	1917-12-30
1918	1918-01-01	1918-11-01
1919	1919-04-15	1919-11-24
1920	1920-01-17	1920-10-03
1921	1921-06-08	1921-11-05
1922	1922-04-19	1922-10-26
1923	1923-02-18	1923-11-23
1924	1924-02-13	1924-12-12
1925	1925-03-04	1925-12-25
1926	1926-03-23	1926-11-21
1927	1927-03-22	1927-12-03
1928	1928-01-12	1928-11-21
1929	1929-04-30	1929-11-20
1930	1930-02-07	1930-11-13
1931	1931-01-28	1931-11-07
1932	1932-03-30	1932-11-26
1933	1933-04-01	1933-12-08
1934	1934-03-03	1934-11-08
1935	1935-04-19	1935-10-28
1936	1936-03-04	1936-11-18
1937	1937-04-14	1937-12-06
1938	1938-04-17	1938-12-08
1939	1939-03-15	1939-11-22
1940	1940-04-10	1940-10-23
1941	1941-05-05	1941-11-06
1942	1942-03-28	1942-11-13
1943	1943-04-01	1943-10-25
1944	1944-05-04	1944-10-20
1945	1945-04-19	1945-11-04
1946	1946-04-11	1946-10-25
1947	1947-03-14	1947-10-31
1949	1949-04-10	1949-11-24
1950	1950-02-25	1950-11-28
1951	1951-01-24	1951-11-06
1952	1952-04-04	1952-10-29
1953	1953-03-23	1953-10-31
1954	1954-04-13	1954-10-22
1955	1955-04-09	1955-11-10
1956	1956-03-23	1956-11-11
1957	1957-04-05	1957-10-09
1958	1958-04-19	1958-12-03
1959	1959-03-31	1959-11-24
1960	1960-03-18	1960-11-01
1961	1961-04-01	1961-11-05
1962	1962-01-07	1962-12-09
1963	1963-02-03	1963-11-12
1964	1964-01-01	1964-11-30
1965	1965-04-19	1965-11-05
1966	1966-03-29	1966-11-02
1967	1967-03-01	1967-11-14
1968	1968-02-23	1968-11-23
1969	1969-01-06	1969-11-04
1970	1970-04-05	1970-11-24
1971	1971-01-18	1971-11-11
1972	1972-02-27	1972-10-07
1973	1973-04-25	1973-11-11
1974	1974-04-07	1974-11-14
1975	1975-05-09	1975-12-08
1976	1976-01-15	1976-11-09
1977	1977-02-15	1977-12-05

Every Fixed Threshold

Fixed thresholds at San Jacinto
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	80	178	1934	151
35 C (95 F): Days	80	110	1962	87
40 C (104 F): Days	78	41	1971	23
45 C (113 F): Days	17	4	1917	3
90 F (32.2 C): Days	80	146	1962	115
100 F (37.8 C): Days	80	74	1964	50
110 F (43.3 C): Days	45	8	1950	1
120 F (48.9 C): Days	1	1	1934	1
0 C (32 F): Frost days (min	77	84	1964	39
-10 C (14 F): Days with min	1	1	1913	1
20 C (68 F): Tropical nights (min	61	10	1916	3
25 C (77 F): Days with min	1	1	1933	1
10 mm (0.39 in): Days with 10 mm or more rain	67	26	1941	12
25 mm (0.98 in): Days with 25 mm or more rain	58	8	1941	2
50 mm (1.97 in): Days with 50 mm or more rain	20	3	1927	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 San Jacinto 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).

San Jacinto Threshold Days by Year (USC00047810)

Key Facts for San Jacinto Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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