Radyr Park Threshold Days by Year (ASN00009598)

4 fixed thresholds counted per year at Radyr Park (ASN00009598): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Radyr Park Thresholds

Radyr Park: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1917 with 56.
Radyr Park: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 1923 with 19.
Radyr Park: days with 50 mm (1.97 in) or more of precipitation in 34 years, most in 1945 with 5.
Radyr Park: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1945 with 1.
4 fixed thresholds have at least one qualifying day at Radyr Park.

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

47 years with a qualifying day

Days per year at Radyr Park with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 56 in 1917.

Days with 10 mm (0.39 in) or more of precipitation per year at Radyr Park
Year	Days	Decade average
1917	56	42.7
1918	37	42.7
1919	35	42.7
1920	31	38.2
1921	46	38.2
1922	34	38.2
1923	43	38.2
1924	37	38.2
1925	30	38.2
1926	50	38.2
1927	37	38.2
1928	42	38.2
1929	32	38.2
1930	44	40.6
1931	42	40.6
1935	47	40.6
1936	32	40.6
1937	42	40.6
1938	33	40.6
1939	44	40.6
1940	25	39.5
1943	36	39.5
1944	30	39.5
1945	50	39.5
1946	50	39.5
1947	42	39.5
1948	39	39.5
1949	44	39.5
1950	35	33.2
1951	30	33.2
1952	32	33.2
1953	28	33.2
1954	24	33.2
1955	50	33.2
1956	38	33.2
1957	35	33.2
1958	35	33.2
1959	25	33.2
1960	31	34.6
1961	37	34.6
1962	32	34.6
1965	41	34.6
1966	38	34.6
1967	39	34.6
1968	33	34.6
1969	26	34.6
1970	41	41

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

First to last qualifying date each year at Radyr Park
Year	First date	Last date
1917	1917-02-10	1917-12-20
1918	1918-02-15	1918-10-28
1919	1919-03-29	1919-10-16
1920	1920-05-07	1920-10-10
1921	1921-02-19	1921-11-04
1922	1922-04-29	1922-12-07
1923	1923-01-20	1923-10-30
1924	1924-02-03	1924-11-03
1925	1925-01-16	1925-10-17
1926	1926-02-24	1926-11-19
1927	1927-03-13	1927-10-25
1928	1928-04-09	1928-11-02
1929	1929-05-03	1929-11-01
1930	1930-04-15	1930-10-19
1931	1931-03-05	1931-10-07
1935	1935-02-25	1935-12-01
1936	1936-03-21	1936-10-03
1937	1937-02-11	1937-12-05
1938	1938-03-16	1938-11-03
1939	1939-01-23	1939-11-25
1940	1940-05-23	1940-12-06
1943	1943-01-31	1943-12-08
1944	1944-04-29	1944-12-15
1945	1945-03-26	1945-12-25
1946	1946-04-19	1946-11-12
1947	1947-04-16	1947-10-25
1948	1948-03-29	1948-12-24
1949	1949-03-12	1949-10-28
1950	1950-05-04	1950-12-27
1951	1951-02-22	1951-12-05
1952	1952-03-28	1952-11-05
1953	1953-02-02	1953-11-16
1954	1954-04-22	1954-11-11
1955	1955-02-15	1955-12-14
1956	1956-03-04	1956-11-29
1957	1957-03-19	1957-10-20
1958	1958-04-17	1958-11-03
1959	1959-04-12	1959-12-31
1960	1960-01-01	1960-10-15
1961	1961-03-27	1961-12-15
1962	1962-05-12	1962-11-30
1965	1965-03-26	1965-12-27
1966	1966-01-02	1966-12-27
1967	1967-01-18	1967-11-16
1968	1968-01-07	1968-10-21
1969	1969-03-13	1969-12-09
1970	1970-02-05	1970-10-06

Every Fixed Threshold

Fixed thresholds at Radyr Park
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	47	56	1917	41
25 mm (0.98 in): Days with 25 mm or more rain	47	19	1923	10
50 mm (1.97 in): Days with 50 mm or more rain	34	5	1945	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1945	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.

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Data for Radyr Park 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).

Radyr Park Threshold Days by Year (ASN00009598)

Key Facts for Radyr Park Thresholds

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

Every Fixed Threshold

Download the Data

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