Weather Records on 21 May 2021

1,131 weather records were set or tied worldwide on 21 May 2021. Highest significance: Silverton, US.

Key Facts for 21 May 2021

On 21 May 2021, 1,131 weather records were set or tied at long-record stations worldwide.
382 were record highs and 474 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 73 monthly and 1,057 daily.
Silverton set a daily record precipitation of 35.8 mm (1.4 in) on 21 May 2021.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 456 records.

Record Map

1,131 stations

1,131 station records on 21 May 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Silverton	United States	Record daily precipitation	35.8 mm (1.4 in)	74 of 100 (Major)
Ft Benton	United States	Record daily snowfall	15.0 cm (5.9 in)	70 of 100 (Major)
Upper Rio Grande	United States	Record daily precipitation	63.5 mm (2.5 in)	69 of 100 (Major)
Hermit 8 SE	United States	Record daily precipitation	34.0 mm (1.3 in)	67 of 100 (Major)
Osaka	Japan	Record daily precipitation	191.0 mm (7.5 in)	63 of 100 (Major)
Choteau	United States	Record snow depth	17.8 cm (7.0 in)	62 of 100 (Major)
Beartown	United States	Record daily precipitation	68.6 mm (2.7 in)	62 of 100 (Major)
Pitea	Sweden	Record daily precipitation	28.0 mm (1.1 in)	61 of 100 (Major)
Bynum 4 SSE	United States	Record daily snowfall	15.7 cm (6.2 in)	61 of 100 (Major)
Molas Lake	United States	Record daily precipitation	50.8 mm (2.0 in)	61 of 100 (Major)
Middle Creek	United States	Record daily precipitation	53.3 mm (2.1 in)	59 of 100 (Notable)
Goldbutte 7 N	United States	Record snow depth	22.9 cm (9.0 in)	58 of 100 (Notable)
Key West NAS	United States	Record low minimum temperature	16.1 C (61.0 F)	58 of 100 (Notable)
Goldbutte 7 N	United States	Record daily snowfall	17.8 cm (7.0 in)	56 of 100 (Notable)
Red Mountain Pass	United States	Record daily precipitation	55.9 mm (2.2 in)	56 of 100 (Notable)
Big Timber	United States	Record daily snowfall	7.6 cm (3.0 in)	55 of 100 (Notable)
Loma	United States	Record daily snowfall	13.5 cm (5.3 in)	55 of 100 (Notable)
Chinook	United States	Record daily snowfall	8.9 cm (3.5 in)	53 of 100 (Notable)
Dunkirk 19NNE	United States	Record daily snowfall	6.6 cm (2.6 in)	53 of 100 (Notable)
Silver Creek Divide	United States	Record daily precipitation	30.5 mm (1.2 in)	52 of 100 (Notable)
Great Falls AP	United States	Record daily snowfall	8.1 cm (3.2 in)	52 of 100 (Notable)
Mineral Creek	United States	Record daily precipitation	35.6 mm (1.4 in)	51 of 100 (Notable)
Lizard Head Pass	United States	Record daily precipitation	33.0 mm (1.3 in)	51 of 100 (Notable)
Holter Dam	United States	Record daily snowfall	5.1 cm (2.0 in)	50 of 100 (Notable)
Holter Dam	United States	Record snow depth	10.2 cm (4.0 in)	50 of 100 (Notable)
Valentine	United States	Record daily snowfall	5.1 cm (2.0 in)	50 of 100 (Notable)
Kenmare 1 WSW	United States	Record daily precipitation	41.9 mm (1.6 in)	49 of 100 (Notable)
Mukteshwar Kumaon	India	Record daily precipitation	113.0 mm (4.4 in)	48 of 100 (Notable)
Gibson Dam	United States	Record low maximum temperature	1.1 C (34.0 F)	48 of 100 (Notable)
Glasgow #2	United States	Record low maximum temperature	3.9 C (39.0 F)	48 of 100 (Notable)
Grass Range	United States	Record daily snowfall	7.6 cm (3.0 in)	48 of 100 (Notable)
Trout Creek	United States	Record daily precipitation	40.6 mm (1.6 in)	48 of 100 (Notable)
Progreso	Mexico	Record daily precipitation	65.5 mm (2.6 in)	47 of 100 (Notable)
Conrad	United States	Record low maximum temperature	-0.6 C (30.9 F)	47 of 100 (Notable)
Ft Benton	United States	Record snow depth	15.2 cm (6.0 in)	47 of 100 (Notable)
Goldbutte 7 N	United States	Record low maximum temperature	-0.6 C (30.9 F)	47 of 100 (Notable)
Butte Bert Mooney AP	United States	Record low maximum temperature	-1.0 C (30.2 F)	47 of 100 (Notable)
Havre AP ASOS	United States	Record daily snowfall	11.7 cm (4.6 in)	47 of 100 (Notable)
Kobe	Japan	Record daily precipitation	87.9 mm (3.5 in)	46 of 100 (Notable)
Worcester	South Africa	Record daily precipitation	30.0 mm (1.2 in)	46 of 100 (Notable)
Paradise	United States	Record high minimum temperature	16.7 C (62.1 F)	46 of 100 (Notable)
Leesville	United States	Record daily precipitation	93.0 mm (3.7 in)	46 of 100 (Notable)
Dunkirk 19NNE	United States	Record low maximum temperature	1.1 C (34.0 F)	46 of 100 (Notable)
Joplin	United States	Record daily snowfall	5.6 cm (2.2 in)	46 of 100 (Notable)
Dulce	United States	Record high minimum temperature	10.6 C (51.1 F)	46 of 100 (Notable)
Donaldsonville 4 SW	United States	Record daily precipitation	94.7 mm (3.7 in)	45 of 100 (Notable)
Beaver Is	United States	Record high minimum temperature	16.1 C (61.0 F)	45 of 100 (Notable)
Bozeman Montana State UNIV	United States	Record low maximum temperature	3.3 C (37.9 F)	45 of 100 (Notable)
Fairfield	United States	Record low maximum temperature	-1.1 C (30.0 F)	45 of 100 (Notable)
Ft Assiniboine	United States	Record snow depth	17.8 cm (7.0 in)	45 of 100 (Notable)
Bluff	United States	Record high minimum temperature	20.0 C (68.0 F)	45 of 100 (Notable)
Wallace	United States	Record high minimum temperature	17.8 C (64.0 F)	44 of 100 (Notable)
Melville 4 W	United States	Record daily snowfall	20.6 cm (8.1 in)	44 of 100 (Notable)
Sun Rvr 4 S	United States	Record daily snowfall	6.9 cm (2.7 in)	44 of 100 (Notable)
Yerington	United States	Record low maximum temperature	9.4 C (48.9 F)	44 of 100 (Notable)
Norris Madison Pwr House	United States	Record low minimum temperature	-1.7 C (28.9 F)	43 of 100 (Notable)
Graton	United States	Record low minimum temperature	1.7 C (35.1 F)	42 of 100 (Notable)
Susanville 2SW	United States	Record low maximum temperature	8.3 C (46.9 F)	42 of 100 (Notable)
Ft Lewis	United States	Record daily precipitation	26.2 mm (1.0 in)	42 of 100 (Notable)
Riggins	United States	Record low maximum temperature	8.3 C (46.9 F)	42 of 100 (Notable)

Counts by Type and Timescale

1,131 records

Records set or tied on 21 May 2021 by type: Highest daily maximum 126, Lowest daily maximum 326, Highest daily minimum 256, Lowest daily minimum 148, Heaviest daily rainfall 183, Heaviest daily snowfall 45, Deepest snow cover 47.

Records on 21 May 2021 by type
Record type	Records
Highest daily maximum	126
Lowest daily maximum	326
Highest daily minimum	256
Lowest daily minimum	148
Heaviest daily rainfall	183
Heaviest daily snowfall	45
Deepest snow cover	47

Records on 21 May 2021 by timescale: all-time 1, monthly 73, daily 1,057.

How Much Records Were Beaten By

932 broken records

Margins by which the 932 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 229.0. Ties are not counted.

Top 20 by Significance

21 May 2021

Top 20 records on 21 May 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 2021	Silverton, US	daily rain	35.8 mm (1.4 in)	16.7 mm (0.7 in)	100 years	74 of 100 (Major)
21 May 2021	Ft Benton, US	daily snowfall	15.0 cm (5.9 in)	15.0 cm (5.9 in)	121 years	70 of 100 (Major)
21 May 2021	Upper Rio Grande, US	all-time rain	63.5 mm (2.5 in)	15.2 mm (0.6 in)	31 years	69 of 100 (Major)
21 May 2021	Hermit 8 SE, US	daily rain	34.0 mm (1.3 in)	21.3 mm (0.8 in)	100 years	67 of 100 (Major)
21 May 2021	Osaka, JP	monthly rain	191.0 mm (7.5 in)	83.0 mm (3.3 in)	26 years	63 of 100 (Major)
21 May 2021	Choteau, US	daily snow depth	17.8 cm (7.0 in)	17.8 cm (7.0 in)	116 years	62 of 100 (Major)
21 May 2021	Beartown, US	monthly rain	68.6 mm (2.7 in)	22.9 mm (0.9 in)	31 years	62 of 100 (Major)
21 May 2021	Pitea, SE	daily rain	28.0 mm (1.1 in)	10.4 mm (0.4 in)	151 years	61 of 100 (Major)
21 May 2021	Bynum 4 SSE, US	daily snowfall	15.7 cm (6.2 in)	15.7 cm (6.2 in)	70 years	61 of 100 (Major)
21 May 2021	Molas Lake, US	monthly rain	50.8 mm (2.0 in)	20.3 mm (0.8 in)	28 years	61 of 100 (Major)
21 May 2021	Middle Creek, US	monthly rain	53.3 mm (2.1 in)	17.7 mm (0.7 in)	40 years	59 of 100 (Notable)
21 May 2021	Goldbutte 7 N, US	daily snow depth	22.9 cm (9.0 in)	22.9 cm (9.0 in)	116 years	58 of 100 (Notable)
21 May 2021	Key West NAS, US	daily low min	16.1 C (61.0 F)	6.1 C (11.0 F)	52 years	58 of 100 (Notable)
21 May 2021	Goldbutte 7 N, US	daily snowfall	17.8 cm (7.0 in)	11.4 cm (4.5 in)	104 years	56 of 100 (Notable)
21 May 2021	Red Mountain Pass, US	daily rain	55.9 mm (2.2 in)	45.7 mm (1.8 in)	40 years	56 of 100 (Notable)
21 May 2021	Big Timber, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	126 years	55 of 100 (Notable)
21 May 2021	Loma, US	daily snowfall	13.5 cm (5.3 in)	13.5 cm (5.3 in)	71 years	55 of 100 (Notable)
21 May 2021	Chinook, US	daily snowfall	8.9 cm (3.5 in)	6.6 cm (2.6 in)	120 years	53 of 100 (Notable)
21 May 2021	Dunkirk 19NNE, US	daily snowfall	6.6 cm (2.6 in)	6.6 cm (2.6 in)	108 years	53 of 100 (Notable)
21 May 2021	Silver Creek Divide, US	daily rain	30.5 mm (1.2 in)	25.4 mm (1.0 in)	34 years	52 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 2021

Records set or tied on this calendar date in each year from 1793 to 2021. 2021 had 1,131 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 2021-05-21: 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).

Margin	Records
0 to 50	873
50 to 100	44
100 to 150	9
150 to 200	4
200 to 250	2