Weather Records on 21 May 1984

950 weather records were set or tied worldwide on 21 May 1984. Highest significance: Den Helder-1, NL.

Key Facts for 21 May 1984

On 21 May 1984, 950 weather records were set or tied at long-record stations worldwide.
328 were record highs and 87 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 86 monthly and 864 daily.
Den Helder-1 set a daily record precipitation of 35.0 mm (1.4 in) on 21 May 1984.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 457 records.

Record Map

950 stations

950 station records on 21 May 1984 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Den Helder-1	Netherlands	Record daily precipitation	35.0 mm (1.4 in)	80 of 100 (Exceptional)
Arnhem	Netherlands	Record daily precipitation	34.4 mm (1.4 in)	69 of 100 (Major)
Arneiroz	Brazil	Record daily precipitation	50.0 mm (2.0 in)	59 of 100 (Notable)
Nordhorn	Germany	Record daily precipitation	33.8 mm (1.3 in)	59 of 100 (Notable)
Muenster	Germany	Record daily precipitation	40.3 mm (1.6 in)	58 of 100 (Notable)
De Haukes	Netherlands	Record daily precipitation	39.4 mm (1.6 in)	58 of 100 (Notable)
Koln-Bonn	Germany	Record daily precipitation	45.8 mm (1.8 in)	56 of 100 (Notable)
Schagen	Netherlands	Record daily precipitation	40.0 mm (1.6 in)	56 of 100 (Notable)
Lowestoft	United Kingdom	Record daily precipitation	26.3 mm (1.0 in)	55 of 100 (Notable)
Callantsoog	Netherlands	Record daily precipitation	41.4 mm (1.6 in)	54 of 100 (Notable)
Hengelo (O)	Netherlands	Record daily precipitation	42.2 mm (1.7 in)	54 of 100 (Notable)
Waldhauser (National Park)	Germany	Record daily precipitation	59.9 mm (2.4 in)	53 of 100 (Notable)
Jacobina	Brazil	Record daily precipitation	39.4 mm (1.6 in)	52 of 100 (Notable)
Monchengladbach	Germany	Record daily precipitation	27.8 mm (1.1 in)	52 of 100 (Notable)
Solingen-Hohenscheid	Germany	Record daily precipitation	51.1 mm (2.0 in)	52 of 100 (Notable)
Neuwied	Germany	Record daily precipitation	31.6 mm (1.2 in)	52 of 100 (Notable)
Cedar Run (River)	United States	Record daily precipitation	74.9 mm (2.9 in)	52 of 100 (Notable)
Herleshausen	Germany	Record daily precipitation	44.3 mm (1.7 in)	51 of 100 (Notable)
Koln-Botanischer Garten	Germany	Record daily precipitation	37.3 mm (1.5 in)	51 of 100 (Notable)
Remscheid-Lennep	Germany	Record daily precipitation	39.7 mm (1.6 in)	51 of 100 (Notable)
Klazienaveen	Netherlands	Record daily precipitation	29.9 mm (1.2 in)	51 of 100 (Notable)
Koblenz-Horchheim	Germany	Record daily precipitation	33.1 mm (1.3 in)	50 of 100 (Notable)
Brotterode	Germany	Record daily precipitation	39.7 mm (1.6 in)	50 of 100 (Notable)
Duiven	Netherlands	Record daily precipitation	28.7 mm (1.1 in)	50 of 100 (Notable)
Sosnovo-Ozerskoe	Russia	Record daily precipitation	36.2 mm (1.4 in)	50 of 100 (Notable)
Schotten	Germany	Record daily precipitation	42.5 mm (1.7 in)	49 of 100 (Notable)
Bonn-Friesdorf	Germany	Record daily precipitation	34.7 mm (1.4 in)	49 of 100 (Notable)
Buchten	Netherlands	Record daily precipitation	34.2 mm (1.3 in)	49 of 100 (Notable)
St Anthonis	Netherlands	Record daily precipitation	29.7 mm (1.2 in)	49 of 100 (Notable)
Weilerswist-Lommersum	Germany	Record daily precipitation	29.9 mm (1.2 in)	48 of 100 (Notable)
Waltershausen	Germany	Record daily precipitation	30.1 mm (1.2 in)	48 of 100 (Notable)
Oudenbosch	Netherlands	Record daily precipitation	32.0 mm (1.3 in)	48 of 100 (Notable)
Oostvoorne	Netherlands	Record daily precipitation	31.0 mm (1.2 in)	48 of 100 (Notable)
Valkenburg (L)	Netherlands	Record daily precipitation	39.3 mm (1.5 in)	48 of 100 (Notable)
Eureka	United States	Record high maximum temperature	35.0 C (95.0 F)	48 of 100 (Notable)
Norwalk Wwtp	United States	Record daily precipitation	40.1 mm (1.6 in)	48 of 100 (Notable)
Rantoul	United States	Record daily precipitation	45.7 mm (1.8 in)	48 of 100 (Notable)
Dusseldorf-Sudfriedhof	Germany	Record daily precipitation	35.5 mm (1.4 in)	47 of 100 (Notable)
Grebenhain-Herchenhain	Germany	Record daily precipitation	43.7 mm (1.7 in)	47 of 100 (Notable)
Oud Alblas	Netherlands	Record daily precipitation	37.5 mm (1.5 in)	47 of 100 (Notable)
Stein (L)	Netherlands	Record daily precipitation	33.7 mm (1.3 in)	47 of 100 (Notable)
Bad Schwalbach	Germany	Record daily precipitation	28.8 mm (1.1 in)	46 of 100 (Notable)
Wuppertal-Buchenhofen	Germany	Record daily precipitation	38.4 mm (1.5 in)	46 of 100 (Notable)
Lettele	Netherlands	Record daily precipitation	32.7 mm (1.3 in)	46 of 100 (Notable)
Klundert	Netherlands	Record daily precipitation	33.3 mm (1.3 in)	46 of 100 (Notable)
Almelo	Netherlands	Record daily precipitation	47.5 mm (1.9 in)	46 of 100 (Notable)
Rekken	Netherlands	Record daily precipitation	29.4 mm (1.2 in)	46 of 100 (Notable)
Schinnen	Netherlands	Record daily precipitation	41.3 mm (1.6 in)	46 of 100 (Notable)
Versailles	United States	Record daily precipitation	35.1 mm (1.4 in)	46 of 100 (Notable)
Geldern-Walbeck	Germany	Record daily precipitation	27.2 mm (1.1 in)	45 of 100 (Notable)
Bad-Ahrweiler Neuenahr	Germany	Record daily precipitation	28.5 mm (1.1 in)	45 of 100 (Notable)
Aksuat	Kazakhstan	Record daily precipitation	32.1 mm (1.3 in)	45 of 100 (Notable)
Roermond	Netherlands	Record daily precipitation	30.8 mm (1.2 in)	45 of 100 (Notable)
Emmen	Netherlands	Record daily precipitation	30.8 mm (1.2 in)	45 of 100 (Notable)
Ubachsberg	Netherlands	Record daily precipitation	41.2 mm (1.6 in)	45 of 100 (Notable)
Borken In Westfalen	Germany	Record daily precipitation	36.9 mm (1.5 in)	44 of 100 (Notable)
Petten	Netherlands	Record daily precipitation	34.4 mm (1.4 in)	44 of 100 (Notable)
Joure	Netherlands	Record daily precipitation	25.9 mm (1.0 in)	44 of 100 (Notable)
Nagele	Netherlands	Record daily precipitation	35.9 mm (1.4 in)	44 of 100 (Notable)
Pinjarra	Australia	Record daily precipitation	55.2 mm (2.2 in)	43 of 100 (Notable)

Counts by Type and Timescale

950 records

Records set or tied on 21 May 1984 by type: Highest daily maximum 162, Lowest daily maximum 45, Highest daily minimum 166, Lowest daily minimum 42, Heaviest daily rainfall 533, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 21 May 1984 by type
Record type	Records
Highest daily maximum	162
Lowest daily maximum	45
Highest daily minimum	166
Lowest daily minimum	42
Heaviest daily rainfall	533
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 21 May 1984 by timescale: all-time 0, monthly 86, daily 864.

How Much Records Were Beaten By

826 broken records

Margins by which the 826 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 102.0. Ties are not counted.

Top 20 by Significance

21 May 1984

Top 20 records on 21 May 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1984	Den Helder-1, NL	daily rain	35.0 mm (1.4 in)	19.2 mm (0.8 in)	127 years	80 of 100 (Exceptional)
21 May 1984	Arnhem, NL	daily rain	34.4 mm (1.4 in)	21.1 mm (0.8 in)	76 years	69 of 100 (Major)
21 May 1984	Arneiroz, BR	daily rain	50.0 mm (2.0 in)	36.3 mm (1.4 in)	72 years	59 of 100 (Notable)
21 May 1984	Nordhorn, DE	daily rain	33.8 mm (1.3 in)	21.9 mm (0.9 in)	48 years	59 of 100 (Notable)
21 May 1984	Muenster, DE	daily rain	40.3 mm (1.6 in)	19.9 mm (0.8 in)	31 years	58 of 100 (Notable)
21 May 1984	De Haukes, NL	monthly rain	39.4 mm (1.6 in)	15.9 mm (0.6 in)	24 years	58 of 100 (Notable)
21 May 1984	Koln-Bonn, DE	daily rain	45.8 mm (1.8 in)	38.3 mm (1.5 in)	39 years	56 of 100 (Notable)
21 May 1984	Schagen, NL	monthly rain	40.0 mm (1.6 in)	18.2 mm (0.7 in)	12 years	56 of 100 (Notable)
21 May 1984	Lowestoft, GB	daily rain	26.3 mm (1.0 in)	15.9 mm (0.6 in)	22 years	55 of 100 (Notable)
21 May 1984	Callantsoog, NL	monthly rain	41.4 mm (1.6 in)	21.0 mm (0.8 in)	5 years	54 of 100 (Notable)
21 May 1984	Hengelo (O), NL	monthly rain	42.2 mm (1.7 in)	14.8 mm (0.6 in)	29 years	54 of 100 (Notable)
21 May 1984	Waldhauser (National Park), DE	monthly rain	59.9 mm (2.4 in)	23.0 mm (0.9 in)	18 years	53 of 100 (Notable)
21 May 1984	Jacobina, BR	daily rain	39.4 mm (1.6 in)	33.0 mm (1.3 in)	28 years	52 of 100 (Notable)
21 May 1984	Monchengladbach, DE	daily rain	27.8 mm (1.1 in)	19.0 mm (0.7 in)	33 years	52 of 100 (Notable)
21 May 1984	Solingen-Hohenscheid, DE	daily rain	51.1 mm (2.0 in)	39.0 mm (1.5 in)	24 years	52 of 100 (Notable)
21 May 1984	Neuwied, DE	daily rain	31.6 mm (1.2 in)	23.9 mm (0.9 in)	33 years	52 of 100 (Notable)
21 May 1984	Cedar Run (River), US	daily rain	74.9 mm (2.9 in)	38.1 mm (1.5 in)	13 years	52 of 100 (Notable)
21 May 1984	Herleshausen, DE	daily rain	44.3 mm (1.7 in)	36.4 mm (1.4 in)	27 years	51 of 100 (Notable)
21 May 1984	Koln-Botanischer Garten, DE	daily rain	37.3 mm (1.5 in)	26.0 mm (1.0 in)	24 years	51 of 100 (Notable)
21 May 1984	Remscheid-Lennep, DE	daily rain	39.7 mm (1.6 in)	24.1 mm (0.9 in)	31 years	51 of 100 (Notable)

Significance is a score from 0 to 100 combining margin, the age of the old record and the length of the station's record. How it is computed.

The Same Date in Other Years

1793 to 1984

Records set or tied on this calendar date in each year from 1793 to 1984. 1984 had 950 records.

Counts for years before the ledger starts come from the same station rules.

Records on 05-21 in each year
Year	Records
1793	1
1795	1
1811	1
1837	2
1842	1
1847	2
1854	1
1857	1
1858	1
1865	1
1866	1
1870	2
1875	1
1876	1
1880	2
1882	1
1885	1
1886	2
1887	3
1889	5
1890	3
1891	6
1892	1
1893	1
1894	4
1895	4
1896	5
1897	2
1898	1
1899	5
1900	1
1901	3
1902	4
1903	26
1904	8
1905	7
1906	12
1907	36
1908	13
1909	13
1910	14
1911	87
1912	24
1913	13
1914	26
1915	24
1916	13
1917	76
1918	51
1919	170
1920	39
1921	158
1922	39
1923	125
1924	148
1925	250
1926	221
1927	207
1928	173
1929	247
1930	133
1931	488
1932	343
1933	290
1934	590
1935	190
1936	328
1937	227
1938	348
1939	355
1940	456
1941	525
1942	482
1943	463
1944	310
1945	515
1946	324
1947	485
1948	312
1949	593
1950	403
1951	271
1952	385
1953	501
1954	961
1955	507
1956	409
1957	709
1958	511
1959	684
1960	615
1961	306
1962	553
1963	598
1964	788
1965	238
1966	296
1967	1,022
1968	549
1969	832
1970	449
1971	536
1972	557
1973	493
1974	847
1975	1,160
1976	393
1977	756
1978	575
1979	787
1980	857
1981	1,550
1982	599
1983	1,106
1984	950
1985	610
1986	908
1987	1,242
1988	819
1989	671
1990	947
1991	1,065
1992	1,143
1993	1,197
1994	656
1995	749
1996	1,461
1997	953
1998	1,200
1999	544
2000	897
2001	1,187
2002	2,048
2003	807
2004	898
2005	1,020
2006	810
2007	894
2008	740
2009	1,315
2010	962
2011	959
2012	848
2013	884
2014	522
2015	956
2016	567
2017	780
2018	525
2019	1,668
2020	707
2021	1,131
2022	1,512
2023	794
2024	751
2025	776
2026	356

Download the Data

Data for records on 1984-05-21: CSV or JSON. Field meanings are on the data page.

Sources: 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)) Made with Natural Earth. Public domain map data. Borders are Natural Earth's de facto depiction. Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 20	772
20 to 40	49
40 to 60	3
60 to 80	1
80 to 100	0
100 to 120	1