Corona Threshold Days by Year (USC00292093)

17 fixed thresholds counted per year at Corona (USC00292093): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Corona Thresholds

Corona: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1941 with 32.
Corona: days with a maximum temperature at or above 30 C (86 F) in 61 years, most in 1943 with 76.
Corona: days with a maximum temperature at or below 0 C (32 F) in 59 years, most in 1929 with 14.
Corona: nights with a minimum temperature at or below 0 C (32 F) in 57 years, most in 1964 with 171.
17 fixed thresholds have at least one qualifying day at Corona.

Days at or above 30 C (86 F)

61 years with a qualifying day

Days per year at Corona with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 76 in 1943.

Days at or above 30 C (86 F) per year at Corona
Year	Days	Decade average
1912	21	29.5
1913	12	29.5
1914	11	29.5
1915	27	29.5
1916	43	29.5
1917	56	29.5
1918	53	29.5
1919	13	29.5
1920	15	27.4
1921	12	27.4
1922	65	27.4
1923	26	27.4
1924	42	27.4
1925	19	27.4
1926	8	27.4
1927	29	27.4
1928	28	27.4
1929	30	27.4
1930	19	30.2
1931	20	30.2
1932	7	30.2
1933	5	30.2
1934	66	30.2
1935	21	30.2
1936	47	30.2
1937	55	30.2
1938	29	30.2
1939	33	30.2
1940	25	45.9
1941	36	45.9
1942	29	45.9
1943	76	45.9
1944	35	45.9
1945	49	45.9
1946	37	45.9
1947	76	45.9
1948	50	45.9
1950	24	37.5
1951	63	37.5
1952	63	37.5
1953	49	37.5
1954	37	37.5
1955	12	37.5
1956	41	37.5
1957	27	37.5
1958	32	37.5
1959	27	37.5
1960	27	26.6
1961	35	26.6
1962	23	26.6
1963	32	26.6
1964	31	26.6
1965	18	26.6
1966	27	26.6
1967	22	26.6
1968	19	26.6
1969	32	26.6
1970	24	22.3
1971	24	22.3
1972	20	22.3
1976	21	22.3

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

First to last qualifying date each year at Corona
Year	First date	Last date
1912	1912-05-29	1912-08-11
1913	1913-06-28	1913-08-12
1914	1914-06-26	1914-08-18
1915	1915-05-13	1915-08-23
1916	1916-06-03	1916-09-27
1917	1917-06-09	1917-09-07
1918	1918-05-22	1918-08-31
1919	1919-06-25	1919-09-02
1920	1920-06-07	1920-08-21
1921	1921-06-25	1921-09-19
1922	1922-05-27	1922-09-16
1923	1923-06-12	1923-08-27
1924	1924-06-10	1924-09-08
1925	1925-05-18	1925-07-26
1926	1926-06-29	1926-08-30
1927	1927-06-09	1927-08-02
1928	1928-06-06	1928-09-01
1929	1929-06-08	1929-09-02
1930	1930-06-22	1930-09-07
1931	1931-06-03	1931-08-27
1932	1932-06-25	1932-08-16
1933	1933-07-02	1933-08-10
1934	1934-06-06	1934-08-25
1935	1935-07-28	1935-09-17
1936	1936-05-11	1936-09-15
1937	1937-05-16	1937-09-04
1938	1938-05-26	1938-08-22
1939	1939-06-08	1939-09-06
1940	1940-06-02	1940-08-17
1941	1941-06-13	1941-09-17
1942	1942-07-01	1942-08-28
1943	1943-04-29	1943-09-04
1944	1944-06-19	1944-08-22
1945	1945-05-28	1945-09-11
1946	1946-06-05	1946-08-17
1947	1947-05-04	1947-09-23
1948	1948-05-15	1948-09-21
1950	1950-06-13	1950-09-26
1951	1951-05-27	1951-09-06
1952	1952-06-07	1952-09-19
1953	1953-05-22	1953-09-26
1954	1954-06-16	1954-09-19
1955	1955-06-07	1955-07-15
1956	1956-05-05	1956-09-20
1957	1957-06-08	1957-08-27
1958	1958-05-30	1958-08-16
1959	1959-06-10	1959-09-07
1960	1960-06-15	1960-08-26
1961	1961-06-01	1961-08-29
1962	1962-06-09	1962-08-26
1963	1963-06-15	1963-09-30
1964	1964-05-15	1964-09-03
1965	1965-06-27	1965-08-27
1966	1966-06-17	1966-08-14
1967	1967-05-29	1967-08-08
1968	1968-06-13	1968-07-17
1969	1969-05-30	1969-08-19
1970	1970-06-17	1970-09-13
1971	1971-06-16	1971-07-18
1972	1972-06-19	1972-08-17
1976	1976-06-19	1976-08-27

Every Fixed Threshold

Fixed thresholds at Corona
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	61	76	1943	21
35 C (95 F): Days	25	16	1918	1
40 C (104 F): Days	2	3	1944	3
90 F (32.2 C): Days	56	45	1943	4
100 F (37.8 C): Days	6	6	1918	4
110 F (43.3 C): Days	1	1	1944	1
0 C (32 F): Ice days (max	59	14	1929	7
0 C (32 F): Frost days (min	57	171	1964	159
-10 C (14 F): Days with min	57	48	1964	47
-20 C (-4 F): Days with min	35	8	1963	2
-30 C (-22 F): Days with min	3	2	1971	2
20 C (68 F): Tropical nights (min	20	8	1937	1
10 mm (0.39 in): Days with 10 mm or more rain	64	32	1941	12
25 mm (0.98 in): Days with 25 mm or more rain	53	8	1937	4
50 mm (1.97 in): Days with 50 mm or more rain	7	3	1941	1
10 cm (3.9 in): Days with 10 cm or more snowfall	57	10	1931	2
25 cm (9.8 in): Days with 25 cm or more snowfall	18	3	1944	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 Corona 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).

Corona Threshold Days by Year (USC00292093)

Key Facts for Corona Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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