Weather Records on 21 May 1937

227 weather records were set or tied worldwide on 21 May 1937. Highest significance: Aschersleben, DE.

Key Facts for 21 May 1937

On 21 May 1937, 227 weather records were set or tied at long-record stations worldwide.
123 were record highs and 24 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 4 monthly and 222 daily.
Aschersleben set a daily record precipitation of 35.4 mm (1.4 in) on 21 May 1937.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 462 records.

Record Map

227 stations

227 station records on 21 May 1937 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1937: highest significance records shown on the map
Station	Country	Type	Value	Significance
Aschersleben	Germany	Record daily precipitation	35.4 mm (1.4 in)	42 of 100 (Notable)
Hawi 168	United States	Record daily precipitation	37.6 mm (1.5 in)	41 of 100 (Notable)
Sairang	India	Record daily precipitation	99.1 mm (3.9 in)	39 of 100 (Notable)
Greenfield	United States	Record daily precipitation	54.6 mm (2.1 in)	36 of 100 (Notable)
Milbank 4 NW	United States	Record daily precipitation	115.1 mm (4.5 in)	32 of 100 (Routine)
Wien	Austria	Record high minimum temperature	19.7 C (67.5 F)	31 of 100 (Routine)
Sonnblick	Austria	Record daily precipitation	25.8 mm (1.0 in)	31 of 100 (Routine)
Rapid City Forrest	Canada	Record daily precipitation	41.9 mm (1.6 in)	30 of 100 (Routine)
Coloso	Puerto Rico [United States]	Record low maximum temperature	27.8 C (82.0 F)	29 of 100 (Routine)
Schwerin	Germany	Record high minimum temperature	18.1 C (64.6 F)	27 of 100 (Routine)
Lubeck-Werft	Germany	Record high minimum temperature	16.3 C (61.3 F)	27 of 100 (Routine)
Artern	Germany	Record daily precipitation	31.0 mm (1.2 in)	26 of 100 (Routine)
Wahpeton 3 N	United States	Record daily precipitation	27.9 mm (1.1 in)	26 of 100 (Routine)
Haparanda	Sweden	Record high maximum temperature	23.0 C (73.4 F)	25 of 100 (Routine)
Boras	Sweden	Record high minimum temperature	12.0 C (53.6 F)	24 of 100 (Routine)
Berlin-Dahlem	Germany	Record high minimum temperature	18.3 C (64.9 F)	23 of 100 (Routine)
Karesuando	Sweden	Record high minimum temperature	5.8 C (42.4 F)	23 of 100 (Routine)
Plainville 4WNW	United States	Record daily precipitation	50.3 mm (2.0 in)	23 of 100 (Routine)
Berlin-Dahlem	Germany	Record high maximum temperature	32.1 C (89.8 F)	22 of 100 (Routine)
Seleng	India	Record daily precipitation	57.2 mm (2.3 in)	22 of 100 (Routine)
Thurman	United States	Record daily precipitation	62.2 mm (2.4 in)	22 of 100 (Routine)
McPherson	United States	Record daily precipitation	50.8 mm (2.0 in)	22 of 100 (Routine)
Kailua 446	United States	Record low maximum temperature	21.7 C (71.1 F)	22 of 100 (Routine)
Haleakala Rch 432	United States	Record daily precipitation	36.8 mm (1.4 in)	21 of 100 (Routine)
Koebenhavn: Landbohojskolen-1	Denmark	Record daily precipitation	21.5 mm (0.8 in)	20 of 100 (Routine)
Ulan-Ude	Russia	Record daily precipitation	14.3 mm (0.6 in)	20 of 100 (Routine)
Simcoe	Canada	Record daily precipitation	14.7 mm (0.6 in)	20 of 100 (Routine)
Mahoba	India	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Ebrach	Germany	Record daily precipitation	22.8 mm (0.9 in)	20 of 100 (Routine)
St Georges	Canada	Record daily precipitation	10.9 mm (0.4 in)	20 of 100 (Routine)
Sion 2	Switzerland	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Geneve Observatoire	Switzerland	Record daily precipitation	18.2 mm (0.7 in)	20 of 100 (Routine)
Agra	India	Record daily precipitation	8.4 mm (0.33 in)	20 of 100 (Routine)
Jhansi	India	Record daily precipitation	10.2 mm (0.4 in)	20 of 100 (Routine)
Campbell	United States	Record daily precipitation	23.4 mm (0.9 in)	20 of 100 (Routine)
Bamberg (Sternwarte)	Germany	Record daily precipitation	13.2 mm (0.5 in)	20 of 100 (Routine)
Chemnitz	Germany	Record high minimum temperature	16.0 C (60.8 F)	20 of 100 (Routine)
Osijek	Croatia	Record high minimum temperature	18.0 C (64.4 F)	20 of 100 (Routine)
Ponce 4 E	Puerto Rico [United States]	Record low maximum temperature	28.3 C (82.9 F)	20 of 100 (Routine)
Storlien	Sweden	Record high minimum temperature	7.2 C (45.0 F)	20 of 100 (Routine)
Karesuando	Sweden	Record high maximum temperature	19.0 C (66.2 F)	20 of 100 (Routine)
Eufaula	United States	Record high maximum temperature	36.1 C (97.0 F)	20 of 100 (Routine)
Columbus	United States	Record daily precipitation	39.6 mm (1.6 in)	20 of 100 (Routine)
Conway	United States	Record low minimum temperature	8.3 C (46.9 F)	20 of 100 (Routine)
Parnu	Estonia	Record high minimum temperature	16.6 C (61.9 F)	19 of 100 (Routine)
Pecs Pogany	Hungary	Record high minimum temperature	20.6 C (69.1 F)	19 of 100 (Routine)
Bikrampur	India	Record daily precipitation	108.0 mm (4.3 in)	19 of 100 (Routine)
Garotha	India	Record daily precipitation	10.2 mm (0.4 in)	19 of 100 (Routine)
Osage City	United States	Record daily precipitation	30.5 mm (1.2 in)	19 of 100 (Routine)
Guthrie 5S	United States	Record high minimum temperature	21.7 C (71.1 F)	19 of 100 (Routine)
White River	Canada	Record daily precipitation	14.5 mm (0.6 in)	18 of 100 (Routine)
Bhikapur	India	Record daily precipitation	5.1 mm (0.20 in)	18 of 100 (Routine)
Greensboro	United States	Record high maximum temperature	35.0 C (95.0 F)	18 of 100 (Routine)
Henderson 2 NNW	United States	Record low minimum temperature	7.2 C (45.0 F)	18 of 100 (Routine)
Crosbyton	United States	Record high maximum temperature	37.8 C (100.0 F)	18 of 100 (Routine)
Haiku 490	United States	Record low maximum temperature	22.2 C (72.0 F)	18 of 100 (Routine)
Kohala 179.1	United States	Record daily precipitation	20.8 mm (0.8 in)	18 of 100 (Routine)
Wallaceburg	Canada	Record daily precipitation	20.8 mm (0.8 in)	17 of 100 (Routine)
Lubeck-Werft	Germany	Record high maximum temperature	29.4 C (84.9 F)	17 of 100 (Routine)
Hvar	Croatia	Record high minimum temperature	21.0 C (69.8 F)	17 of 100 (Routine)

Counts by Type and Timescale

227 records

Records set or tied on 21 May 1937 by type: Highest daily maximum 57, Lowest daily maximum 8, Highest daily minimum 66, Lowest daily minimum 16, Heaviest daily rainfall 80.

Records on 21 May 1937 by type
Record type	Records
Highest daily maximum	57
Lowest daily maximum	8
Highest daily minimum	66
Lowest daily minimum	16
Heaviest daily rainfall	80
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 May 1937 by timescale: all-time 1, monthly 4, daily 222.

How Much Records Were Beaten By

182 broken records

Margins by which the 182 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 59.5. Ties are not counted.

Top 20 by Significance

21 May 1937

Top 20 records on 21 May 1937 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1937	Aschersleben, DE	daily rain	35.4 mm (1.4 in)	19.6 mm (0.8 in)	28 years	42 of 100 (Notable)
21 May 1937	Hawi 168, US	daily rain	37.6 mm (1.5 in)	25.7 mm (1.0 in)	23 years	41 of 100 (Notable)
21 May 1937	Sairang, IN	daily rain	99.1 mm (3.9 in)	59.5 mm (2.3 in)	12 years	39 of 100 (Notable)
21 May 1937	Greenfield, US	daily rain	54.6 mm (2.1 in)	28.7 mm (1.1 in)	38 years	36 of 100 (Notable)
21 May 1937	Milbank 4 NW, US	all-time rain	115.1 mm (4.5 in)	8.2 mm (0.32 in)	5 years	32 of 100 (Routine)
21 May 1937	Wien, AT	daily high min	19.7 C (67.5 F)	1.4 C (2.5 F)	66 years	31 of 100 (Routine)
21 May 1937	Sonnblick, AT	daily rain	25.8 mm (1.0 in)	15.7 mm (0.6 in)	31 years	31 of 100 (Routine)
21 May 1937	Rapid City Forrest, CA	daily rain	41.9 mm (1.6 in)	17.0 mm (0.7 in)	19 years	30 of 100 (Routine)
21 May 1937	Coloso, PR	daily low max	27.8 C (82.0 F)	2.2 C (4.0 F)	30 years	29 of 100 (Routine)
21 May 1937	Schwerin, DE	monthly high min	18.1 C (64.6 F)	0.3 C (0.5 F)	44 years	27 of 100 (Routine)
21 May 1937	Lubeck-Werft, DE	daily high min	16.3 C (61.3 F)	3.1 C (5.6 F)	46 years	27 of 100 (Routine)
21 May 1937	Artern, DE	daily rain	31.0 mm (1.2 in)	10.6 mm (0.4 in)	12 years	26 of 100 (Routine)
21 May 1937	Wahpeton 3 N, US	daily rain	27.9 mm (1.1 in)	12.7 mm (0.5 in)	32 years	26 of 100 (Routine)
21 May 1937	Haparanda, SE	daily high max	23.0 C (73.4 F)	3.0 C (5.4 F)	49 years	25 of 100 (Routine)
21 May 1937	Boras, SE	daily high min	12.0 C (53.6 F)	2.0 C (3.6 F)	48 years	24 of 100 (Routine)
21 May 1937	Berlin-Dahlem, DE	daily high min	18.3 C (64.9 F)	1.4 C (2.5 F)	46 years	23 of 100 (Routine)
21 May 1937	Karesuando, SE	daily high min	5.8 C (42.4 F)	1.8 C (3.2 F)	46 years	23 of 100 (Routine)
21 May 1937	Plainville 4WNW, US	daily rain	50.3 mm (2.0 in)	13.7 mm (0.5 in)	19 years	23 of 100 (Routine)
21 May 1937	Berlin-Dahlem, DE	daily high max	32.1 C (89.8 F)	0.6 C (1.1 F)	50 years	22 of 100 (Routine)
21 May 1937	Seleng, IN	daily rain	57.2 mm (2.3 in)	20.1 mm (0.8 in)	26 years	22 of 100 (Routine)

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 1937

Records set or tied on this calendar date in each year from 1793 to 1937. 1937 had 227 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 1937-05-21: 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 10	157
10 to 20	19
20 to 30	5
30 to 40	0
40 to 50	0
50 to 60	1