Weather Records on 21 May 1947

485 weather records were set or tied worldwide on 21 May 1947. Highest significance: Diamond Harbour, IN.

Key Facts for 21 May 1947

On 21 May 1947, 485 weather records were set or tied at long-record stations worldwide.
150 were record highs and 86 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 8 monthly and 477 daily.
Diamond Harbour set a daily record precipitation of 171.5 mm (6.8 in) on 21 May 1947.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 460 records.

Record Map

485 stations

485 station records on 21 May 1947 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1947: highest significance records shown on the map
Station	Country	Type	Value	Significance
Diamond Harbour	India	Record daily precipitation	171.5 mm (6.8 in)	55 of 100 (Notable)
Harrington (Oxley Anchorage Ca	Australia	Record daily precipitation	80.5 mm (3.2 in)	50 of 100 (Notable)
Bulahdelah Post Office	Australia	Record daily precipitation	129.5 mm (5.1 in)	49 of 100 (Notable)
Rajauli	India	Record daily precipitation	66.0 mm (2.6 in)	49 of 100 (Notable)
Mantova	Italy	Record daily precipitation	44.8 mm (1.8 in)	49 of 100 (Notable)
Uluberia	India	Record daily precipitation	154.9 mm (6.1 in)	48 of 100 (Notable)
Pine Bluff	United States	Record daily precipitation	94.7 mm (3.7 in)	48 of 100 (Notable)
Texas Station	Australia	Record daily precipitation	45.2 mm (1.8 in)	47 of 100 (Notable)
Stroud Post Office	Australia	Record daily precipitation	71.6 mm (2.8 in)	46 of 100 (Notable)
Budge Budge	India	Record daily precipitation	215.4 mm (8.5 in)	44 of 100 (Notable)
Ozark 6 NNW	United States	Record daily precipitation	77.5 mm (3.1 in)	44 of 100 (Notable)
Morgan City	United States	Record daily precipitation	114.3 mm (4.5 in)	44 of 100 (Notable)
Point Pleasant	United States	Record daily precipitation	77.5 mm (3.1 in)	44 of 100 (Notable)
Ashwood	United States	Record daily precipitation	52.1 mm (2.1 in)	43 of 100 (Notable)
Monkerai Upper (Redleaf)	Australia	Record daily precipitation	53.3 mm (2.1 in)	41 of 100 (Notable)
Marianna Sch For Boys	United States	Record daily precipitation	63.5 mm (2.5 in)	41 of 100 (Notable)
Texas Post Office	Australia	Record daily precipitation	48.3 mm (1.9 in)	40 of 100 (Notable)
Auburn	United States	Record daily precipitation	38.4 mm (1.5 in)	40 of 100 (Notable)
Kitchener	Canada	Record daily precipitation	47.0 mm (1.9 in)	38 of 100 (Notable)
Laurieton (Elouera St)	Australia	Record daily precipitation	79.0 mm (3.1 in)	37 of 100 (Notable)
Belleville Dam 2O	United States	Record daily precipitation	47.0 mm (1.9 in)	37 of 100 (Notable)
Wauchope (Avondale Street)	Australia	Record daily precipitation	59.7 mm (2.4 in)	36 of 100 (Notable)
De Funiak Springs 1 E	United States	Record daily precipitation	112.8 mm (4.4 in)	36 of 100 (Notable)
Franklin Sewage Plt	United States	Record daily precipitation	83.1 mm (3.3 in)	36 of 100 (Notable)
Cockle Creek (Pasminco Metals)	Australia	Record daily precipitation	50.8 mm (2.0 in)	35 of 100 (Notable)
Dungog Post Office	Australia	Record daily precipitation	48.0 mm (1.9 in)	35 of 100 (Notable)
Bikram	India	Record daily precipitation	38.1 mm (1.5 in)	35 of 100 (Notable)
Henryville Sf	United States	Record daily precipitation	41.4 mm (1.6 in)	35 of 100 (Notable)
Abbeville	United States	Record daily precipitation	113.8 mm (4.5 in)	35 of 100 (Notable)
Charleston	United States	Record daily precipitation	37.1 mm (1.5 in)	33 of 100 (Routine)
Hopkinsville	United States	Record daily precipitation	47.8 mm (1.9 in)	33 of 100 (Routine)
Manly Town Hall	Australia	Record daily precipitation	95.5 mm (3.8 in)	32 of 100 (Routine)
Kislovodsk	Russia	Record daily precipitation	32.8 mm (1.3 in)	32 of 100 (Routine)
Jeanerette 5 NW	United States	Record daily precipitation	112.3 mm (4.4 in)	32 of 100 (Routine)
Seal Rocks Camping Reserve	Australia	Record daily precipitation	46.5 mm (1.8 in)	31 of 100 (Routine)
Algonquin Park	Canada	Record daily precipitation	31.8 mm (1.3 in)	31 of 100 (Routine)
Russellville	United States	Record daily precipitation	35.3 mm (1.4 in)	31 of 100 (Routine)
Dover 1 W	United States	Record daily precipitation	30.0 mm (1.2 in)	31 of 100 (Routine)
Kendall Post Office	Australia	Record daily precipitation	42.7 mm (1.7 in)	30 of 100 (Routine)
Maitland West	Australia	Record daily precipitation	33.0 mm (1.3 in)	30 of 100 (Routine)
Spring Hill	United States	Record daily precipitation	76.7 mm (3.0 in)	30 of 100 (Routine)
Quincy	United States	Record high minimum temperature	12.2 C (54.0 F)	30 of 100 (Routine)
Concord	United States	Record daily precipitation	45.2 mm (1.8 in)	30 of 100 (Routine)
Franklin	United States	Record daily precipitation	39.4 mm (1.6 in)	30 of 100 (Routine)
Dickson	United States	Record daily precipitation	47.2 mm (1.9 in)	30 of 100 (Routine)
Moorland (Denro-An)	Australia	Record daily precipitation	40.6 mm (1.6 in)	29 of 100 (Routine)
Winamac 2SSE	United States	Record daily precipitation	30.0 mm (1.2 in)	29 of 100 (Routine)
Palmetto	United States	Record daily precipitation	51.6 mm (2.0 in)	29 of 100 (Routine)
Helensburgh (Sawan St)	Australia	Record daily precipitation	87.6 mm (3.4 in)	28 of 100 (Routine)
Calcutta/Barracks	India	Record daily precipitation	63.5 mm (2.5 in)	28 of 100 (Routine)
Cape Girardeau	United States	Record daily precipitation	48.0 mm (1.9 in)	28 of 100 (Routine)
Medicine Lake 3 SE	United States	Record daily precipitation	36.8 mm (1.4 in)	28 of 100 (Routine)
Lewisburg Exp STN	United States	Record daily precipitation	47.8 mm (1.9 in)	28 of 100 (Routine)
Telegraph Point (Farrawells Ro	Australia	Record daily precipitation	63.2 mm (2.5 in)	27 of 100 (Routine)
Campbells Hill	Australia	Record daily precipitation	37.8 mm (1.5 in)	27 of 100 (Routine)
West Branch	United States	Record high minimum temperature	14.4 C (57.9 F)	27 of 100 (Routine)
Wheatfield	United States	Record daily precipitation	27.9 mm (1.1 in)	27 of 100 (Routine)
Gordon	United States	Record high minimum temperature	20.0 C (68.0 F)	27 of 100 (Routine)
Lynnville 4 SSW	United States	Record daily precipitation	46.2 mm (1.8 in)	27 of 100 (Routine)
Savannah 6 SW	United States	Record daily precipitation	35.1 mm (1.4 in)	27 of 100 (Routine)

Counts by Type and Timescale

485 records

Records set or tied on 21 May 1947 by type: Highest daily maximum 58, Lowest daily maximum 45, Highest daily minimum 92, Lowest daily minimum 41, Heaviest daily rainfall 245, Heaviest daily snowfall 4.

Records on 21 May 1947 by type
Record type	Records
Highest daily maximum	58
Lowest daily maximum	45
Highest daily minimum	92
Lowest daily minimum	41
Heaviest daily rainfall	245
Heaviest daily snowfall	4
Deepest snow cover	0

Records on 21 May 1947 by timescale: all-time 0, monthly 8, daily 477.

How Much Records Were Beaten By

403 broken records

Margins by which the 403 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 137.5. Ties are not counted.

Top 20 by Significance

21 May 1947

Top 20 records on 21 May 1947 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1947	Diamond Harbour, IN	daily rain	171.5 mm (6.8 in)	137.5 mm (5.4 in)	37 years	55 of 100 (Notable)
21 May 1947	Harrington (Oxley Anchorage Ca, AU	daily rain	80.5 mm (3.2 in)	56.4 mm (2.2 in)	32 years	50 of 100 (Notable)
21 May 1947	Bulahdelah Post Office, AU	daily rain	129.5 mm (5.1 in)	114.3 mm (4.5 in)	18 years	49 of 100 (Notable)
21 May 1947	Rajauli, IN	monthly rain	66.0 mm (2.6 in)	23.3 mm (0.9 in)	36 years	49 of 100 (Notable)
21 May 1947	Mantova, IT	daily rain	44.8 mm (1.8 in)	11.3 mm (0.4 in)	81 years	49 of 100 (Notable)
21 May 1947	Uluberia, IN	daily rain	154.9 mm (6.1 in)	66.0 mm (2.6 in)	40 years	48 of 100 (Notable)
21 May 1947	Pine Bluff, US	daily rain	94.7 mm (3.7 in)	59.9 mm (2.4 in)	24 years	48 of 100 (Notable)
21 May 1947	Texas Station, AU	daily rain	45.2 mm (1.8 in)	29.2 mm (1.1 in)	50 years	47 of 100 (Notable)
21 May 1947	Stroud Post Office, AU	daily rain	71.6 mm (2.8 in)	59.2 mm (2.3 in)	6 years	46 of 100 (Notable)
21 May 1947	Budge Budge, IN	monthly rain	215.4 mm (8.5 in)	45.2 mm (1.8 in)	28 years	44 of 100 (Notable)
21 May 1947	Ozark 6 NNW, US	daily rain	77.5 mm (3.1 in)	51.8 mm (2.0 in)	16 years	44 of 100 (Notable)
21 May 1947	Morgan City, US	daily rain	114.3 mm (4.5 in)	67.1 mm (2.6 in)	18 years	44 of 100 (Notable)
21 May 1947	Point Pleasant, US	daily rain	77.5 mm (3.1 in)	35.3 mm (1.4 in)	12 years	44 of 100 (Notable)
21 May 1947	Ashwood, US	daily rain	52.1 mm (2.1 in)	38.1 mm (1.5 in)	36 years	43 of 100 (Notable)
21 May 1947	Monkerai Upper (Redleaf), AU	daily rain	53.3 mm (2.1 in)	37.6 mm (1.5 in)	4 years	41 of 100 (Notable)
21 May 1947	Marianna Sch For Boys, US	daily rain	63.5 mm (2.5 in)	43.2 mm (1.7 in)	45 years	41 of 100 (Notable)
21 May 1947	Texas Post Office, AU	daily rain	48.3 mm (1.9 in)	28.5 mm (1.1 in)	25 years	40 of 100 (Notable)
21 May 1947	Auburn, US	daily rain	38.4 mm (1.5 in)	19.3 mm (0.8 in)	34 years	40 of 100 (Notable)
21 May 1947	Kitchener, CA	daily rain	47.0 mm (1.9 in)	32.8 mm (1.3 in)	4 years	38 of 100 (Notable)
21 May 1947	Laurieton (Elouera St), AU	daily rain	79.0 mm (3.1 in)	51.1 mm (2.0 in)	32 years	37 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 1947

Records set or tied on this calendar date in each year from 1793 to 1947. 1947 had 485 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 1947-05-21: 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	346
20 to 40	36
40 to 60	14
60 to 80	5
80 to 100	0
100 to 120	1
120 to 140	1