Bryn Euryn Threshold Days by Year

5 fixed thresholds counted per year at Bryn Euryn (ASN00040030): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bryn Euryn Thresholds

Bryn Euryn: days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 1971 with 54.
Bryn Euryn: days with 25 mm (0.98 in) or more of precipitation in 39 years, most in 1924 with 24.
Bryn Euryn: days with 50 mm (1.97 in) or more of precipitation in 37 years, most in 1947 with 12.
Bryn Euryn: days with 100 mm (3.94 in) or more of precipitation in 23 years, most in 1928 with 4.
5 fixed thresholds have at least one qualifying day at Bryn Euryn.

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

39 years with a qualifying day

Days per year at Bryn Euryn with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 1971.

Days with 10 mm (0.39 in) or more of precipitation per year at Bryn Euryn
Year	Days	Decade average
1918	25	25
1919	25	25
1920	37	42.5
1921	52	42.5
1923	21	42.5
1924	49	42.5
1925	53	42.5
1927	43	42.5
1928	47	42.5
1929	38	42.5
1930	42	38.5
1931	52	38.5
1932	30	38.5
1933	40	38.5
1934	39	38.5
1935	28	38.5
1936	24	38.5
1937	43	38.5
1938	41	38.5
1939	46	38.5
1940	29	34.6
1941	27	34.6
1944	31	34.6
1945	30	34.6
1946	36	34.6
1947	49	34.6
1948	40	34.6
1949	35	34.6
1962	46	38.8
1963	35	38.8
1964	36	38.8
1965	36	38.8
1966	35	38.8
1967	48	38.8
1968	35	38.8
1969	39	38.8
1970	41	45
1971	54	45
1972	40	45

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

First to last qualifying date each year at Bryn Euryn
Year	First date	Last date
1918	1918-01-02	1918-12-19
1919	1919-02-19	1919-12-18
1920	1920-01-01	1920-11-22
1921	1921-01-06	1921-12-31
1923	1923-01-04	1923-12-27
1924	1924-01-08	1924-12-31
1925	1925-01-02	1925-12-31
1927	1927-01-18	1927-12-26
1928	1928-01-09	1928-12-20
1929	1929-01-11	1929-12-31
1930	1930-01-13	1930-12-18
1931	1931-01-09	1931-12-10
1932	1932-01-04	1932-12-21
1933	1933-01-06	1933-12-27
1934	1934-01-03	1934-12-28
1935	1935-01-06	1935-12-27
1936	1936-01-10	1936-12-25
1937	1937-01-11	1937-12-30
1938	1938-01-19	1938-12-22
1939	1939-01-01	1939-12-27
1940	1940-01-05	1940-12-21
1941	1941-01-07	1941-12-30
1944	1944-01-02	1944-12-30
1945	1945-01-03	1945-12-05
1946	1946-01-06	1946-12-30
1947	1947-01-23	1947-12-25
1948	1948-01-02	1948-12-31
1949	1949-01-04	1949-12-20
1962	1962-01-02	1962-12-31
1963	1963-01-01	1963-12-31
1964	1964-01-11	1964-12-27
1965	1965-01-07	1965-12-14
1966	1966-02-04	1966-12-30
1967	1967-01-05	1967-12-29
1968	1968-01-03	1968-12-11
1969	1969-01-01	1969-12-30
1970	1970-01-02	1970-12-30
1971	1971-01-01	1971-12-28
1972	1972-01-01	1972-12-27

Every Fixed Threshold

Fixed thresholds at Bryn Euryn
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	39	54	1971	40
25 mm (0.98 in): Days with 25 mm or more rain	39	24	1924	19
50 mm (1.97 in): Days with 50 mm or more rain	37	12	1947	7
100 mm (3.94 in): Days with 100 mm or more rain	23	4	1928	2
200 mm (7.87 in): Days with 200 mm or more rain	5	2	1947	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1918.

Download the Data

Data for Bryn Euryn 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).

Bryn Euryn Threshold Days by Year

Key Facts for Bryn Euryn Thresholds

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

Every Fixed Threshold

Download the Data

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