Ioco Refinery Threshold Days by Year (CA001103660)

6 fixed thresholds counted per year at Ioco Refinery (CA001103660): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ioco Refinery Thresholds

Ioco Refinery: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1953 with 91.
Ioco Refinery: days with 25 mm (0.98 in) or more of precipitation in 53 years, most in 1961 with 34.
Ioco Refinery: days with 50 mm (1.97 in) or more of precipitation in 52 years, most in 1935 with 11.
Ioco Refinery: days with 10 cm (3.9 in) or more of snowfall in 43 years, most in 1949 with 11.
6 fixed thresholds have at least one qualifying day at Ioco Refinery.

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

53 years with a qualifying day

Days per year at Ioco Refinery with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 91 in 1953.

Days with 10 mm (0.39 in) or more of precipitation per year at Ioco Refinery
Year	Days	Decade average
1917	73	72.3
1918	73	72.3
1919	71	72.3
1920	73	66.1
1921	79	66.1
1922	57	66.1
1923	62	66.1
1924	67	66.1
1925	69	66.1
1926	68	66.1
1927	70	66.1
1928	66	66.1
1929	50	66.1
1930	60	73.6
1931	87	73.6
1932	85	73.6
1933	82	73.6
1934	79	73.6
1935	63	73.6
1936	61	73.6
1937	77	73.6
1938	65	73.6
1939	77	73.6
1940	66	68.6
1941	77	68.6
1942	59	68.6
1943	54	68.6
1944	60	68.6
1945	72	68.6
1946	72	68.6
1947	75	68.6
1948	81	68.6
1949	70	68.6
1950	84	74.4
1951	71	74.4
1952	66	74.4
1953	91	74.4
1954	82	74.4
1955	76	74.4
1956	70	74.4
1958	59	74.4
1959	71	74.4
1960	74	75
1961	79	75
1968	72	75
1975	66	57.8
1976	62	57.8
1977	58	57.8
1978	45	57.8
1980	69	68.3
1981	66	68.3
1982	65	68.3
1983	73	68.3

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

First to last qualifying date each year at Ioco Refinery
Year	First date	Last date
1917	1917-01-01	1917-12-31
1918	1918-01-01	1918-12-27
1919	1919-01-14	1919-12-29
1920	1920-01-11	1920-12-31
1921	1921-01-01	1921-12-31
1922	1922-01-01	1922-12-31
1923	1923-01-01	1923-12-24
1924	1924-01-06	1924-12-28
1925	1925-01-01	1925-12-22
1926	1926-01-04	1926-12-30
1927	1927-01-01	1927-12-26
1928	1928-01-01	1928-12-29
1929	1929-01-01	1929-12-31
1930	1930-01-03	1930-12-22
1931	1931-01-02	1931-12-24
1932	1932-01-03	1932-12-28
1933	1933-01-01	1933-12-28
1934	1934-01-02	1934-12-31
1935	1935-01-01	1935-12-30
1936	1936-01-01	1936-12-23
1937	1937-01-03	1937-12-30
1938	1938-01-09	1938-12-31
1939	1939-01-01	1939-12-29
1940	1940-01-01	1940-12-28
1941	1941-01-03	1941-12-22
1942	1942-01-09	1942-12-30
1943	1943-01-13	1943-12-31
1944	1944-01-01	1944-12-31
1945	1945-01-04	1945-12-31
1946	1946-01-03	1946-12-21
1947	1947-01-09	1947-12-31
1948	1948-01-01	1948-12-30
1949	1949-01-05	1949-12-30
1950	1950-01-01	1950-12-29
1951	1951-01-01	1951-12-22
1952	1952-01-05	1952-12-31
1953	1953-01-02	1953-12-31
1954	1954-01-01	1954-12-31
1955	1955-01-04	1955-12-21
1956	1956-01-01	1956-12-31
1958	1958-01-03	1958-12-29
1959	1959-01-05	1959-12-24
1960	1960-01-05	1960-12-30
1961	1961-01-03	1961-12-28
1968	1968-01-04	1968-12-31
1975	1975-01-04	1975-12-29
1976	1976-01-02	1976-12-25
1977	1977-01-16	1977-12-28
1978	1978-01-03	1978-12-21
1980	1980-01-11	1980-12-27
1981	1981-01-20	1981-12-31
1982	1982-01-07	1982-12-25
1983	1983-01-02	1983-12-30

Every Fixed Threshold

Fixed thresholds at Ioco Refinery
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	53	91	1953	73
25 mm (0.98 in): Days with 25 mm or more rain	53	34	1961	19
50 mm (1.97 in): Days with 50 mm or more rain	52	11	1935	6
100 mm (3.94 in): Days with 100 mm or more rain	14	3	1968	3
10 cm (3.9 in): Days with 10 cm or more snowfall	43	11	1949	1
25 cm (9.8 in): Days with 25 cm or more snowfall	8	2	1933	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

Data for Ioco Refinery 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).

Ioco Refinery Threshold Days by Year (CA001103660)

Key Facts for Ioco Refinery Thresholds

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

Every Fixed Threshold

Download the Data

Related