Weather Records on 21 May 1945

515 weather records were set or tied worldwide on 21 May 1945. Highest significance: Caledon (Pol), ZA.

Key Facts for 21 May 1945

On 21 May 1945, 515 weather records were set or tied at long-record stations worldwide.
33 were record highs and 101 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 13 monthly and 502 daily.
Caledon (Pol) set a daily record precipitation of 55.9 mm (2.2 in) on 21 May 1945.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 460 records.

Record Map

515 stations

515 station records on 21 May 1945 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1945: highest significance records shown on the map
Station	Country	Type	Value	Significance
Caledon (Pol)	South Africa	Record daily precipitation	55.9 mm (2.2 in)	63 of 100 (Major)
Robertson	South Africa	Record daily precipitation	45.7 mm (1.8 in)	63 of 100 (Major)
Fremont	United States	Record daily precipitation	99.1 mm (3.9 in)	63 of 100 (Major)
Tomsk	Russia	Record daily precipitation	43.5 mm (1.7 in)	56 of 100 (Notable)
Houston Wb City	United States	Record daily precipitation	138.4 mm (5.4 in)	56 of 100 (Notable)
Cape Town Fire Station	South Africa	Record daily precipitation	55.9 mm (2.2 in)	54 of 100 (Notable)
Lincoln 1 SE	United States	Record daily precipitation	101.6 mm (4.0 in)	53 of 100 (Notable)
McGregor (Pol)	South Africa	Record daily precipitation	47.2 mm (1.9 in)	52 of 100 (Notable)
Kewaunee	United States	Record daily precipitation	88.1 mm (3.5 in)	51 of 100 (Notable)
Homestead 985	United States	Record daily precipitation	58.4 mm (2.3 in)	50 of 100 (Notable)
Arcoverde (Rio Branco)	Brazil	Record daily precipitation	55.0 mm (2.2 in)	48 of 100 (Notable)
Chirawa	India	Record daily precipitation	29.5 mm (1.2 in)	48 of 100 (Notable)
Little Sioux	United States	Record daily precipitation	61.2 mm (2.4 in)	45 of 100 (Notable)
Cochrane	Canada	Record daily precipitation	30.5 mm (1.2 in)	44 of 100 (Notable)
Jefferson	United States	Record daily precipitation	69.1 mm (2.7 in)	42 of 100 (Notable)
Sac City	United States	Record daily precipitation	67.3 mm (2.6 in)	42 of 100 (Notable)
Marshfield Exp Farm	United States	Record daily precipitation	56.1 mm (2.2 in)	42 of 100 (Notable)
Hatfield	United States	Record daily precipitation	64.5 mm (2.5 in)	41 of 100 (Notable)
Cumberland	United States	Record daily precipitation	72.9 mm (2.9 in)	40 of 100 (Notable)
Hays 1 S	United States	Record daily precipitation	63.2 mm (2.5 in)	40 of 100 (Notable)
Weeping Water	United States	Record daily precipitation	74.4 mm (2.9 in)	40 of 100 (Notable)
Superior	United States	Record daily precipitation	57.4 mm (2.3 in)	39 of 100 (Notable)
Umzimkulu (Tnk)	South Africa	Record daily precipitation	31.0 mm (1.2 in)	38 of 100 (Notable)
Alton 1 W	United States	Record daily precipitation	77.5 mm (3.1 in)	38 of 100 (Notable)
Seward	United States	Record daily precipitation	54.4 mm (2.1 in)	38 of 100 (Notable)
Boone	United States	Record daily precipitation	81.3 mm (3.2 in)	37 of 100 (Notable)
Auburn 5 ESE	United States	Record daily precipitation	112.3 mm (4.4 in)	37 of 100 (Notable)
Royal Observatory	South Africa	Record daily precipitation	47.7 mm (1.9 in)	35 of 100 (Notable)
Eersterivier (Bos)	South Africa	Record daily precipitation	38.1 mm (1.5 in)	35 of 100 (Notable)
George Airport	South Africa	Record daily precipitation	53.3 mm (2.1 in)	35 of 100 (Notable)
Vlakfontein	South Africa	Record daily precipitation	33.8 mm (1.3 in)	34 of 100 (Routine)
Le Mars	United States	Record daily precipitation	54.6 mm (2.1 in)	34 of 100 (Routine)
Schuyler	United States	Record daily precipitation	74.9 mm (2.9 in)	34 of 100 (Routine)
Englesberg Village	Australia	Record daily precipitation	34.5 mm (1.4 in)	33 of 100 (Routine)
Dwingelo	Netherlands	Record daily precipitation	35.0 mm (1.4 in)	33 of 100 (Routine)
De Rust (Pol)	South Africa	Record daily precipitation	44.5 mm (1.8 in)	33 of 100 (Routine)
Beloit	United States	Record daily precipitation	46.2 mm (1.8 in)	33 of 100 (Routine)
Ashland #2	United States	Record daily precipitation	50.8 mm (2.0 in)	33 of 100 (Routine)
Robben Island (Vrt)	South Africa	Record daily precipitation	27.4 mm (1.1 in)	32 of 100 (Routine)
Ficksburg	South Africa	Record daily precipitation	25.9 mm (1.0 in)	32 of 100 (Routine)
West Bend	United States	Record daily precipitation	72.4 mm (2.9 in)	32 of 100 (Routine)
Big St Germain Dam	United States	Record daily precipitation	38.9 mm (1.5 in)	32 of 100 (Routine)
Strawberry North	Australia	Record daily precipitation	36.3 mm (1.4 in)	31 of 100 (Routine)
Lowood Don St	Australia	Record daily precipitation	29.5 mm (1.2 in)	31 of 100 (Routine)
Rivertree (Myall)	Australia	Record daily precipitation	38.1 mm (1.5 in)	31 of 100 (Routine)
Minneapolis	United States	Record daily precipitation	55.6 mm (2.2 in)	31 of 100 (Routine)
Mc Cool Junction	United States	Record daily precipitation	35.6 mm (1.4 in)	31 of 100 (Routine)
Prentice #2	United States	Record daily precipitation	45.7 mm (1.8 in)	31 of 100 (Routine)
Murarrie Road Csiro	Australia	Record daily precipitation	48.8 mm (1.9 in)	30 of 100 (Routine)
Schreiber	Canada	Record daily precipitation	28.2 mm (1.1 in)	30 of 100 (Routine)
Kerkwerve	Netherlands	Record daily precipitation	28.3 mm (1.1 in)	30 of 100 (Routine)
Cape Town Maitland (Cem)	South Africa	Record daily precipitation	34.5 mm (1.4 in)	30 of 100 (Routine)
Pocahontas	United States	Record daily precipitation	48.5 mm (1.9 in)	30 of 100 (Routine)
Groot Constantia	South Africa	Record daily precipitation	44.5 mm (1.8 in)	29 of 100 (Routine)
The Towers	South Africa	Record daily precipitation	27.4 mm (1.1 in)	29 of 100 (Routine)
Flagstaff (Tnk)	South Africa	Record daily precipitation	30.5 mm (1.2 in)	29 of 100 (Routine)
Dresden	United States	Record daily precipitation	32.0 mm (1.3 in)	29 of 100 (Routine)
Heilbron (Tnk)	South Africa	Record daily precipitation	26.2 mm (1.0 in)	28 of 100 (Routine)
La Crosse Wb City	United States	Record daily precipitation	71.9 mm (2.8 in)	28 of 100 (Routine)
Rhinelander	United States	Record daily precipitation	43.9 mm (1.7 in)	28 of 100 (Routine)

Counts by Type and Timescale

515 records

Records set or tied on 21 May 1945 by type: Highest daily maximum 9, Lowest daily maximum 24, Highest daily minimum 24, Lowest daily minimum 77, Heaviest daily rainfall 377, Heaviest daily snowfall 4.

Records on 21 May 1945 by type
Record type	Records
Highest daily maximum	9
Lowest daily maximum	24
Highest daily minimum	24
Lowest daily minimum	77
Heaviest daily rainfall	377
Heaviest daily snowfall	4
Deepest snow cover	0

Records on 21 May 1945 by timescale: all-time 0, monthly 13, daily 502.

How Much Records Were Beaten By

446 broken records

Margins by which the 446 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 111.2. Ties are not counted.

Top 20 by Significance

21 May 1945

Top 20 records on 21 May 1945 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1945	Caledon (Pol), ZA	daily rain	55.9 mm (2.2 in)	41.2 mm (1.6 in)	56 years	63 of 100 (Major)
21 May 1945	Robertson, ZA	daily rain	45.7 mm (1.8 in)	30.0 mm (1.2 in)	56 years	63 of 100 (Major)
21 May 1945	Fremont, US	monthly rain	99.1 mm (3.9 in)	38.6 mm (1.5 in)	39 years	63 of 100 (Major)
21 May 1945	Tomsk, RU	daily rain	43.5 mm (1.7 in)	32.9 mm (1.3 in)	36 years	56 of 100 (Notable)
21 May 1945	Houston Wb City, US	daily rain	138.4 mm (5.4 in)	111.2 mm (4.4 in)	35 years	56 of 100 (Notable)
21 May 1945	Cape Town Fire Station, ZA	daily rain	55.9 mm (2.2 in)	31.3 mm (1.2 in)	54 years	54 of 100 (Notable)
21 May 1945	Lincoln 1 SE, US	monthly rain	101.6 mm (4.0 in)	43.9 mm (1.7 in)	7 years	53 of 100 (Notable)
21 May 1945	McGregor (Pol), ZA	daily rain	47.2 mm (1.9 in)	44.4 mm (1.7 in)	27 years	52 of 100 (Notable)
21 May 1945	Kewaunee, US	monthly rain	88.1 mm (3.5 in)	37.3 mm (1.5 in)	3 years	51 of 100 (Notable)
21 May 1945	Homestead 985, US	daily rain	58.4 mm (2.3 in)	42.4 mm (1.7 in)	24 years	50 of 100 (Notable)
21 May 1945	Arcoverde (Rio Branco), BR	daily rain	55.0 mm (2.2 in)	42.6 mm (1.7 in)	18 years	48 of 100 (Notable)
21 May 1945	Chirawa, IN	daily rain	29.5 mm (1.2 in)	21.9 mm (0.9 in)	32 years	48 of 100 (Notable)
21 May 1945	Little Sioux, US	daily rain	61.2 mm (2.4 in)	34.5 mm (1.4 in)	34 years	45 of 100 (Notable)
21 May 1945	Cochrane, CA	daily rain	30.5 mm (1.2 in)	22.4 mm (0.9 in)	24 years	44 of 100 (Notable)
21 May 1945	Jefferson, US	daily rain	69.1 mm (2.7 in)	34.3 mm (1.4 in)	43 years	42 of 100 (Notable)
21 May 1945	Sac City, US	daily rain	67.3 mm (2.6 in)	33.5 mm (1.3 in)	30 years	42 of 100 (Notable)
21 May 1945	Marshfield Exp Farm, US	daily rain	56.1 mm (2.2 in)	33.2 mm (1.3 in)	30 years	42 of 100 (Notable)
21 May 1945	Hatfield, US	daily rain	64.5 mm (2.5 in)	34.8 mm (1.4 in)	31 years	41 of 100 (Notable)
21 May 1945	Cumberland, US	monthly rain	72.9 mm (2.9 in)	20.6 mm (0.8 in)	26 years	40 of 100 (Notable)
21 May 1945	Hays 1 S, US	daily rain	63.2 mm (2.5 in)	37.3 mm (1.5 in)	30 years	40 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 1945

Records set or tied on this calendar date in each year from 1793 to 1945. 1945 had 515 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 1945-05-21: 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	398
20 to 40	39
40 to 60	7
60 to 80	1
80 to 100	0
100 to 120	1