Weather Records on 21 May 2011

959 weather records were set or tied worldwide on 21 May 2011. Highest significance: Dickinson Exp STN, US.

Key Facts for 21 May 2011

On 21 May 2011, 959 weather records were set or tied at long-record stations worldwide.
394 were record highs and 216 were record lows, counting maximum and minimum temperature.
By timescale, 5 were all-time records, 17 monthly and 937 daily.
Dickinson Exp STN set a daily record precipitation of 53.3 mm (2.1 in) on 21 May 2011.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 457 records.

Record Map

959 stations

959 station records on 21 May 2011 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 2011: highest significance records shown on the map
Station	Country	Type	Value	Significance
Dickinson Exp STN	United States	Record daily precipitation	53.3 mm (2.1 in)	68 of 100 (Major)
Watford City	United States	Record daily precipitation	46.2 mm (1.8 in)	64 of 100 (Major)
Dunn Ctr 1E	United States	Record daily precipitation	57.4 mm (2.3 in)	63 of 100 (Major)
Guayama 1SW	Puerto Rico [United States]	Record daily precipitation	108.7 mm (4.3 in)	62 of 100 (Major)
New Salem 5NW	United States	Record daily precipitation	54.4 mm (2.1 in)	60 of 100 (Major)
Batesville L&D 1	United States	Record daily precipitation	108.5 mm (4.3 in)	59 of 100 (Notable)
Newport	United States	Record daily precipitation	76.2 mm (3.0 in)	59 of 100 (Notable)
Colstrip	United States	Record daily precipitation	51.3 mm (2.0 in)	58 of 100 (Notable)
Batesville Lvstk	United States	Record daily precipitation	101.6 mm (4.0 in)	57 of 100 (Notable)
Black Rock	United States	Record daily precipitation	91.7 mm (3.6 in)	56 of 100 (Notable)
Ekalaka	United States	Record daily precipitation	46.5 mm (1.8 in)	56 of 100 (Notable)
Windrush	Australia	Record daily precipitation	45.2 mm (1.8 in)	55 of 100 (Notable)
Nagappattinam	India	Record daily precipitation	49.0 mm (1.9 in)	55 of 100 (Notable)
Burgess Junction	United States	Record daily precipitation	50.3 mm (2.0 in)	55 of 100 (Notable)
Burgess Junction	United States	Record daily snowfall	50.8 cm (20.0 in)	55 of 100 (Notable)
Amity	United States	Record daily precipitation	95.8 mm (3.8 in)	54 of 100 (Notable)
Arundel	Australia	Record daily precipitation	33.0 mm (1.3 in)	53 of 100 (Notable)
Munglinup Melaleuca	Australia	Record daily precipitation	43.9 mm (1.7 in)	53 of 100 (Notable)
Carson	United States	Record daily precipitation	71.4 mm (2.8 in)	52 of 100 (Notable)
Biskra	Algeria	Record daily precipitation	51.1 mm (2.0 in)	51 of 100 (Notable)
Benmore: Younger Botanic Garde	United Kingdom	Record daily precipitation	48.4 mm (1.9 in)	51 of 100 (Notable)
Hebron	United States	Record daily precipitation	76.2 mm (3.0 in)	51 of 100 (Notable)
Placer Basin	United States	Record daily precipitation	48.3 mm (1.9 in)	51 of 100 (Notable)
Perry	United States	Record daily precipitation	110.0 mm (4.3 in)	50 of 100 (Notable)
Warra Jarra	Australia	Record daily precipitation	67.0 mm (2.6 in)	49 of 100 (Notable)
Lort River	Australia	Record daily precipitation	30.0 mm (1.2 in)	49 of 100 (Notable)
Biskra	Algeria	Record low maximum temperature	20.5 C (68.9 F)	48 of 100 (Notable)
Watford City 14S	United States	Record daily precipitation	41.4 mm (1.6 in)	48 of 100 (Notable)
Belle Fourche	United States	Record daily precipitation	27.7 mm (1.1 in)	48 of 100 (Notable)
Warriup	Australia	Record daily precipitation	50.5 mm (2.0 in)	47 of 100 (Notable)
Wellstead	Australia	Record daily precipitation	61.4 mm (2.4 in)	47 of 100 (Notable)
Wills Pt	United States	Record daily precipitation	56.9 mm (2.2 in)	47 of 100 (Notable)
Oldfield	Australia	Record daily precipitation	35.0 mm (1.4 in)	46 of 100 (Notable)
Dillon 1 E	United States	Record daily snowfall	7.6 cm (3.0 in)	46 of 100 (Notable)
Bowdle	United States	Record daily precipitation	36.6 mm (1.4 in)	46 of 100 (Notable)
Minneapolis-St Paul Intl AP	United States	Record daily precipitation	44.2 mm (1.7 in)	46 of 100 (Notable)
Woodburn	Australia	Record daily precipitation	41.0 mm (1.6 in)	45 of 100 (Notable)
Gurabo Substn	Puerto Rico [United States]	Record daily precipitation	123.2 mm (4.9 in)	45 of 100 (Notable)
Antoine 1 SW	United States	Record daily precipitation	82.3 mm (3.2 in)	45 of 100 (Notable)
Paonia 1SW	United States	Record low maximum temperature	11.1 C (52.0 F)	45 of 100 (Notable)
Busby	United States	Record daily precipitation	46.2 mm (1.8 in)	45 of 100 (Notable)
Zortman	United States	Record daily precipitation	76.2 mm (3.0 in)	45 of 100 (Notable)
Mettler	Australia	Record daily precipitation	63.0 mm (2.5 in)	44 of 100 (Notable)
Glenwood 4 NNE	United States	Record daily precipitation	103.6 mm (4.1 in)	44 of 100 (Notable)
Alger-Dar El Beida	Algeria	Record daily precipitation	26.9 mm (1.1 in)	43 of 100 (Notable)
Frankland	Australia	Record daily precipitation	32.0 mm (1.3 in)	43 of 100 (Notable)
Coomalbidgup	Australia	Record daily precipitation	32.6 mm (1.3 in)	43 of 100 (Notable)
Glenwood Spgs #2	United States	Record low maximum temperature	10.0 C (50.0 F)	43 of 100 (Notable)
Collegeville St John's	United States	Record daily precipitation	30.5 mm (1.2 in)	43 of 100 (Notable)
Roscoe	United States	Record daily precipitation	35.3 mm (1.4 in)	43 of 100 (Notable)
Texarkana	United States	Record daily precipitation	77.7 mm (3.1 in)	43 of 100 (Notable)
Karralea	Australia	Record daily precipitation	55.0 mm (2.2 in)	42 of 100 (Notable)
Benton	United States	Record daily precipitation	88.1 mm (3.5 in)	42 of 100 (Notable)
Crested Butte	United States	Record low maximum temperature	3.9 C (39.0 F)	42 of 100 (Notable)
Kremmling	United States	Record low maximum temperature	7.2 C (45.0 F)	42 of 100 (Notable)
Greene	United States	Record daily precipitation	32.0 mm (1.3 in)	42 of 100 (Notable)
Atoka	United States	Record daily precipitation	51.3 mm (2.0 in)	42 of 100 (Notable)
Jaral de Berrios	Mexico	Record high maximum temperature	41.1 C (106.0 F)	41 of 100 (Notable)
Eureka Springs 3 WNW	United States	Record daily precipitation	53.8 mm (2.1 in)	41 of 100 (Notable)
Lake Maumelle	United States	Record daily precipitation	113.3 mm (4.5 in)	41 of 100 (Notable)

Counts by Type and Timescale

959 records

Records set or tied on 21 May 2011 by type: Highest daily maximum 229, Lowest daily maximum 104, Highest daily minimum 165, Lowest daily minimum 112, Heaviest daily rainfall 336, Heaviest daily snowfall 7, Deepest snow cover 6.

Records on 21 May 2011 by type
Record type	Records
Highest daily maximum	229
Lowest daily maximum	104
Highest daily minimum	165
Lowest daily minimum	112
Heaviest daily rainfall	336
Heaviest daily snowfall	7
Deepest snow cover	6

Records on 21 May 2011 by timescale: all-time 5, monthly 17, daily 937.

How Much Records Were Beaten By

745 broken records

Margins by which the 745 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 330.0. Ties are not counted.

Top 20 by Significance

21 May 2011

Top 20 records on 21 May 2011 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 2011	Dickinson Exp STN, US	daily rain	53.3 mm (2.1 in)	24.6 mm (1.0 in)	98 years	68 of 100 (Major)
21 May 2011	Watford City, US	daily rain	46.2 mm (1.8 in)	31.5 mm (1.2 in)	53 years	64 of 100 (Major)
21 May 2011	Dunn Ctr 1E, US	daily rain	57.4 mm (2.3 in)	31.2 mm (1.2 in)	53 years	63 of 100 (Major)
21 May 2011	Guayama 1SW, PR	daily rain	108.7 mm (4.3 in)	47.0 mm (1.9 in)	73 years	62 of 100 (Major)
21 May 2011	New Salem 5NW, US	daily rain	54.4 mm (2.1 in)	17.3 mm (0.7 in)	98 years	60 of 100 (Major)
21 May 2011	Batesville L&D 1, US	daily rain	108.5 mm (4.3 in)	54.1 mm (2.1 in)	56 years	59 of 100 (Notable)
21 May 2011	Newport, US	daily rain	76.2 mm (3.0 in)	29.2 mm (1.1 in)	100 years	59 of 100 (Notable)
21 May 2011	Colstrip, US	daily rain	51.3 mm (2.0 in)	27.4 mm (1.1 in)	58 years	58 of 100 (Notable)
21 May 2011	Batesville Lvstk, US	daily rain	101.6 mm (4.0 in)	57.1 mm (2.2 in)	56 years	57 of 100 (Notable)
21 May 2011	Black Rock, US	daily rain	91.7 mm (3.6 in)	50.0 mm (2.0 in)	56 years	56 of 100 (Notable)
21 May 2011	Ekalaka, US	daily rain	46.5 mm (1.8 in)	26.7 mm (1.1 in)	53 years	56 of 100 (Notable)
21 May 2011	Windrush, AU	daily rain	45.2 mm (1.8 in)	31.5 mm (1.2 in)	37 years	55 of 100 (Notable)
21 May 2011	Nagappattinam, IN	daily rain	49.0 mm (1.9 in)	36.8 mm (1.4 in)	102 years	55 of 100 (Notable)
21 May 2011	Burgess Junction, US	daily rain	50.3 mm (2.0 in)	32.8 mm (1.3 in)	36 years	55 of 100 (Notable)
21 May 2011	Burgess Junction, US	daily snowfall	50.8 cm (20.0 in)	33.0 cm (13.0 in)	36 years	55 of 100 (Notable)
21 May 2011	Amity, US	daily rain	95.8 mm (3.8 in)	32.6 mm (1.3 in)	112 years	54 of 100 (Notable)
21 May 2011	Arundel, AU	daily rain	33.0 mm (1.3 in)	9.9 mm (0.39 in)	96 years	53 of 100 (Notable)
21 May 2011	Munglinup Melaleuca, AU	daily rain	43.9 mm (1.7 in)	30.9 mm (1.2 in)	36 years	53 of 100 (Notable)
21 May 2011	Carson, US	monthly rain	71.4 mm (2.8 in)	17.6 mm (0.7 in)	38 years	52 of 100 (Notable)
21 May 2011	Biskra, DZ	daily rain	51.1 mm (2.0 in)	38.4 mm (1.5 in)	77 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 2011

Records set or tied on this calendar date in each year from 1793 to 2011. 2011 had 959 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 2011-05-21: 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 2026-10-13 (13 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 50	728
50 to 100	14
100 to 150	1
150 to 200	1
200 to 250	0
250 to 300	0
300 to 350	1