Rowena (Iffley) Threshold Days by Year

4 fixed thresholds counted per year at Rowena (Iffley) (ASN00052002): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rowena (Iffley) Thresholds

Rowena (Iffley): days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1950 with 31.
Rowena (Iffley): days with 25 mm (0.98 in) or more of precipitation in 64 years, most in 1950 with 13.
Rowena (Iffley): days with 50 mm (1.97 in) or more of precipitation in 40 years, most in 1950 with 5.
Rowena (Iffley): days with 100 mm (3.94 in) or more of precipitation in 5 years, most in 1976 with 2.
4 fixed thresholds have at least one qualifying day at Rowena (Iffley).

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

66 years with a qualifying day

Days per year at Rowena (Iffley) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 31 in 1950.

Days with 10 mm (0.39 in) or more of precipitation per year at Rowena (Iffley)
Year	Days	Decade average
1902	8	16.8
1903	21	16.8
1904	19	16.8
1905	14	16.8
1906	19	16.8
1907	21	16.8
1908	17	16.8
1909	15	16.8
1910	14	15.4
1911	15	15.4
1912	16	15.4
1913	18	15.4
1914	19	15.4
1916	20	15.4
1917	15	15.4
1918	7	15.4
1919	15	15.4
1920	18	17.1
1921	28	17.1
1922	10	17.1
1923	11	17.1
1924	19	17.1
1925	13	17.1
1926	21	17.1
1930	10	11.8
1933	12	11.8
1935	7	11.8
1937	13	11.8
1938	13	11.8
1939	16	11.8
1940	9	11.8
1941	16	11.8
1942	14	11.8
1943	11	11.8
1944	9	11.8
1945	5	11.8
1946	6	11.8
1947	16	11.8
1948	14	11.8
1949	18	11.8
1950	31	15.3
1951	11	15.3
1952	11	15.3
1957	8	15.3
1961	18	14.9
1962	20	14.9
1963	19	14.9
1964	18	14.9
1965	6	14.9
1966	10	14.9
1967	8	14.9
1969	20	14.9
1971	17	15.6
1972	11	15.6
1973	15	15.6
1974	15	15.6
1975	17	15.6
1976	21	15.6
1977	15	15.6
1978	18	15.6
1979	11	15.6
1981	12	14.4
1985	14	14.4
1986	10	14.4
1988	23	14.4
1989	13	14.4

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

First to last qualifying date each year at Rowena (Iffley)
Year	First date	Last date
1902	1902-02-18	1902-12-18
1903	1903-03-25	1903-12-26
1904	1904-01-03	1904-12-18
1905	1905-01-15	1905-11-30
1906	1906-01-11	1906-10-04
1907	1907-01-09	1907-12-28
1908	1908-02-09	1908-12-22
1909	1909-01-20	1909-11-28
1910	1910-01-13	1910-12-11
1911	1911-01-11	1911-12-31
1912	1912-01-01	1912-12-23
1913	1913-01-07	1913-12-18
1914	1914-02-25	1914-11-12
1916	1916-02-26	1916-12-12
1917	1917-01-18	1917-12-12
1918	1918-01-30	1918-10-30
1919	1919-01-02	1919-12-29
1920	1920-01-21	1920-12-06
1921	1921-02-07	1921-12-27
1922	1922-01-11	1922-12-20
1923	1923-03-09	1923-12-27
1924	1924-01-23	1924-12-16
1925	1925-01-03	1925-12-31
1926	1926-01-01	1926-12-27
1930	1930-01-24	1930-12-25
1933	1933-01-27	1933-11-19
1935	1935-01-04	1935-12-29
1937	1937-02-07	1937-11-20
1938	1938-01-25	1938-11-27
1939	1939-01-26	1939-10-19
1940	1940-02-04	1940-12-31
1941	1941-01-03	1941-11-05
1942	1942-01-15	1942-12-31
1943	1943-01-01	1943-12-18
1944	1944-01-25	1944-11-27
1945	1945-01-11	1945-12-29
1946	1946-01-06	1946-11-19
1947	1947-01-31	1947-12-10
1948	1948-01-02	1948-12-28
1949	1949-01-08	1949-11-22
1950	1950-01-17	1950-12-31
1951	1951-01-07	1951-09-27
1952	1952-02-18	1952-11-26
1957	1957-01-04	1957-12-31
1961	1961-01-02	1961-12-31
1962	1962-01-04	1962-12-30
1963	1963-01-10	1963-11-16
1964	1964-01-13	1964-10-18
1965	1965-01-25	1965-12-15
1966	1966-01-06	1966-11-08
1967	1967-01-25	1967-08-18
1969	1969-01-03	1969-12-23
1971	1971-01-14	1971-12-04
1972	1972-01-13	1972-11-25
1973	1973-01-13	1973-12-31
1974	1974-01-07	1974-11-17
1975	1975-02-12	1975-12-23
1976	1976-01-14	1976-12-24
1977	1977-01-14	1977-11-30
1978	1978-01-06	1978-12-26
1979	1979-01-26	1979-11-09
1981	1981-02-10	1981-11-02
1985	1985-02-20	1985-12-07
1986	1986-04-17	1986-12-01
1988	1988-01-02	1988-12-16
1989	1989-01-01	1989-11-01

Every Fixed Threshold

Fixed thresholds at Rowena (Iffley)
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	66	31	1950	13
25 mm (0.98 in): Days with 25 mm or more rain	64	13	1950	9
50 mm (1.97 in): Days with 50 mm or more rain	40	5	1950	3
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1976	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

Data for Rowena (Iffley) 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Rowena (Iffley) Threshold Days by Year

Key Facts for Rowena (Iffley) Thresholds

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

Every Fixed Threshold

Download the Data

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