Weather Records on 21 May 1963

598 weather records were set or tied worldwide on 21 May 1963. Highest significance: Hornepayne, CA.

Key Facts for 21 May 1963

On 21 May 1963, 598 weather records were set or tied at long-record stations worldwide.
189 were record highs and 263 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 31 monthly and 567 daily.
Hornepayne set a monthly record daily snowfall of 27.9 cm (11.0 in) on 21 May 1963.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 460 records.

Record Map

598 stations

598 station records on 21 May 1963 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1963: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hornepayne	Canada	Record daily snowfall	27.9 cm (11.0 in)	58 of 100 (Notable)
Bullara	Australia	Record daily precipitation	75.7 mm (3.0 in)	57 of 100 (Notable)
Weebo	Australia	Record daily precipitation	62.7 mm (2.5 in)	55 of 100 (Notable)
Estancia	Brazil	Record daily precipitation	131.7 mm (5.2 in)	48 of 100 (Notable)
Hedrum	Norway	Record daily precipitation	46.8 mm (1.8 in)	48 of 100 (Notable)
Apslawn	Australia	Record daily precipitation	41.9 mm (1.6 in)	45 of 100 (Notable)
Bjornholt	Norway	Record daily precipitation	64.5 mm (2.5 in)	45 of 100 (Notable)
Wandagee	Australia	Record daily precipitation	84.3 mm (3.3 in)	43 of 100 (Notable)
Cythera	Australia	Record daily precipitation	35.6 mm (1.4 in)	43 of 100 (Notable)
Wallabadah (Gaspard)	Australia	Record daily precipitation	38.9 mm (1.5 in)	41 of 100 (Notable)
Abitibi Canyon	Canada	Record daily snowfall	11.7 cm (4.6 in)	41 of 100 (Notable)
Meekatharra Post Office	Australia	Record daily precipitation	26.2 mm (1.0 in)	39 of 100 (Notable)
Kathleen Valley	Australia	Record daily precipitation	29.5 mm (1.2 in)	37 of 100 (Notable)
Itaporanga Dajuda	Brazil	Record daily precipitation	85.2 mm (3.4 in)	37 of 100 (Notable)
Nord Odal	Norway	Record daily precipitation	27.1 mm (1.1 in)	36 of 100 (Notable)
Chilliwack	Canada	Record high minimum temperature	17.2 C (63.0 F)	35 of 100 (Notable)
Arcade	United States	Record daily precipitation	25.7 mm (1.0 in)	35 of 100 (Notable)
Conconully	United States	Record high minimum temperature	15.6 C (60.1 F)	35 of 100 (Notable)
Port Townsend	United States	Record high maximum temperature	29.4 C (84.9 F)	35 of 100 (Notable)
Snoqualmie Falls	United States	Record high maximum temperature	34.4 C (93.9 F)	35 of 100 (Notable)
Pillar Valley	Australia	Record daily precipitation	88.9 mm (3.5 in)	34 of 100 (Routine)
Anacortes	United States	Record high maximum temperature	30.6 C (87.1 F)	34 of 100 (Routine)
Belka	Australia	Record daily precipitation	29.5 mm (1.2 in)	32 of 100 (Routine)
Walkerston	Australia	Record daily precipitation	30.5 mm (1.2 in)	32 of 100 (Routine)
Moorcroft 3S	United States	Record low minimum temperature	-4.4 C (24.1 F)	32 of 100 (Routine)
Yeelirrie	Australia	Record daily precipitation	26.7 mm (1.1 in)	31 of 100 (Routine)
Agassiz Cda	Canada	Record high maximum temperature	32.8 C (91.0 F)	31 of 100 (Routine)
Chilliwack	Canada	Record high maximum temperature	33.3 C (91.9 F)	31 of 100 (Routine)
Edmore 4NW	United States	Record low maximum temperature	3.3 C (37.9 F)	31 of 100 (Routine)
Coupeville 1 S	United States	Record high minimum temperature	11.7 C (53.1 F)	31 of 100 (Routine)
Faerder Fyr	Norway	Record daily precipitation	34.0 mm (1.3 in)	30 of 100 (Routine)
Arcadia	United States	Record low minimum temperature	10.6 C (51.1 F)	30 of 100 (Routine)
Buckley 1 NE	United States	Record high minimum temperature	15.6 C (60.1 F)	30 of 100 (Routine)
Yarraman Post Office	Australia	Record daily precipitation	26.7 mm (1.1 in)	29 of 100 (Routine)
Tallapoosa 2 N	United States	Record low minimum temperature	2.2 C (36.0 F)	29 of 100 (Routine)
Abilene	United States	Record low maximum temperature	13.9 C (57.0 F)	29 of 100 (Routine)
Ekalaka	United States	Record low minimum temperature	-7.8 C (18.0 F)	29 of 100 (Routine)
Napoleon	United States	Record low maximum temperature	7.2 C (45.0 F)	29 of 100 (Routine)
Sedro-Woolley	United States	Record high minimum temperature	16.1 C (61.0 F)	29 of 100 (Routine)
Snoqualmie Falls	United States	Record high minimum temperature	17.2 C (63.0 F)	29 of 100 (Routine)
Victoria Gonzales Hts	Canada	Record high minimum temperature	14.4 C (57.9 F)	28 of 100 (Routine)
New Westminster	Canada	Record high maximum temperature	31.7 C (89.1 F)	28 of 100 (Routine)
Kapuskasing Cda	Canada	Record daily snowfall	5.6 cm (2.2 in)	28 of 100 (Routine)
Bridger 2 N	United States	Record low minimum temperature	-2.2 C (28.0 F)	28 of 100 (Routine)
Mellette 4 W	United States	Record low minimum temperature	-2.2 C (28.0 F)	28 of 100 (Routine)
Clearbrook	United States	Record high maximum temperature	33.3 C (91.9 F)	28 of 100 (Routine)
Seattle UNIV of Washin	United States	Record high maximum temperature	33.9 C (93.0 F)	28 of 100 (Routine)
Saltspring Island	Canada	Record high maximum temperature	30.0 C (86.0 F)	27 of 100 (Routine)
Medicine Hat A	Canada	Record low minimum temperature	-1.7 C (28.9 F)	27 of 100 (Routine)
Nashlyn	Canada	Record low minimum temperature	-8.3 C (17.1 F)	27 of 100 (Routine)
Corning	United States	Record low maximum temperature	14.4 C (57.9 F)	27 of 100 (Routine)
Springview 2NW	United States	Record low minimum temperature	-1.1 C (30.0 F)	27 of 100 (Routine)
Corvallis State UNIV	United States	Record high maximum temperature	33.3 C (91.9 F)	27 of 100 (Routine)
Dodgeville Wwtp	United States	Record low minimum temperature	2.8 C (37.0 F)	27 of 100 (Routine)
Valencia Creek (Bulgar Park)	Australia	Record daily precipitation	44.5 mm (1.8 in)	26 of 100 (Routine)
Chapple Vale	Australia	Record daily precipitation	25.4 mm (1.0 in)	26 of 100 (Routine)
White Rock Campbell Scientific	Canada	Record high maximum temperature	30.0 C (86.0 F)	26 of 100 (Routine)
Coppermine	Canada	Record high maximum temperature	16.7 C (62.1 F)	26 of 100 (Routine)
Pogranichnyj	Russia	Record high maximum temperature	30.6 C (87.1 F)	26 of 100 (Routine)
Nogliki	Russia	Record high minimum temperature	5.5 C (41.9 F)	26 of 100 (Routine)

Counts by Type and Timescale

598 records

Records set or tied on 21 May 1963 by type: Highest daily maximum 112, Lowest daily maximum 118, Highest daily minimum 77, Lowest daily minimum 145, Heaviest daily rainfall 138, Heaviest daily snowfall 7, Deepest snow cover 1.

Records on 21 May 1963 by type
Record type	Records
Highest daily maximum	112
Lowest daily maximum	118
Highest daily minimum	77
Lowest daily minimum	145
Heaviest daily rainfall	138
Heaviest daily snowfall	7
Deepest snow cover	1

Records on 21 May 1963 by timescale: all-time 0, monthly 31, daily 567.

How Much Records Were Beaten By

480 broken records

Margins by which the 480 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 127.0. Ties are not counted.

Top 20 by Significance

21 May 1963

Top 20 records on 21 May 1963 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1963	Hornepayne, CA	monthly snowfall	27.9 cm (11.0 in)	12.7 cm (5.0 in)	34 years	58 of 100 (Notable)
21 May 1963	Bullara, AU	daily rain	75.7 mm (3.0 in)	60.5 mm (2.4 in)	41 years	57 of 100 (Notable)
21 May 1963	Weebo, AU	monthly rain	62.7 mm (2.5 in)	35.5 mm (1.4 in)	8 years	55 of 100 (Notable)
21 May 1963	Estancia, BR	daily rain	131.7 mm (5.2 in)	89.4 mm (3.5 in)	13 years	48 of 100 (Notable)
21 May 1963	Hedrum, NO	daily rain	46.8 mm (1.8 in)	36.0 mm (1.4 in)	8 years	48 of 100 (Notable)
21 May 1963	Apslawn, AU	daily rain	41.9 mm (1.6 in)	30.0 mm (1.2 in)	56 years	45 of 100 (Notable)
21 May 1963	Bjornholt, NO	monthly rain	64.5 mm (2.5 in)	10.2 mm (0.4 in)	50 years	45 of 100 (Notable)
21 May 1963	Wandagee, AU	daily rain	84.3 mm (3.3 in)	40.1 mm (1.6 in)	44 years	43 of 100 (Notable)
21 May 1963	Cythera, AU	daily rain	35.6 mm (1.4 in)	33.8 mm (1.3 in)	4 years	43 of 100 (Notable)
21 May 1963	Wallabadah (Gaspard), AU	daily rain	38.9 mm (1.5 in)	22.9 mm (0.9 in)	41 years	41 of 100 (Notable)
21 May 1963	Abitibi Canyon, CA	daily snowfall	11.7 cm (4.6 in)	10.4 cm (4.1 in)	32 years	41 of 100 (Notable)
21 May 1963	Meekatharra Post Office, AU	daily rain	26.2 mm (1.0 in)	23.9 mm (0.9 in)	37 years	39 of 100 (Notable)
21 May 1963	Kathleen Valley, AU	daily rain	29.5 mm (1.2 in)	15.5 mm (0.6 in)	37 years	37 of 100 (Notable)
21 May 1963	Itaporanga Dajuda, BR	daily rain	85.2 mm (3.4 in)	34.0 mm (1.3 in)	44 years	37 of 100 (Notable)
21 May 1963	Nord Odal, NO	daily rain	27.1 mm (1.1 in)	8.1 mm (0.32 in)	56 years	36 of 100 (Notable)
21 May 1963	Chilliwack, CA	daily high min	17.2 C (63.0 F)	5.0 C (9.0 F)	34 years	35 of 100 (Notable)
21 May 1963	Arcade, US	daily rain	25.7 mm (1.0 in)	7.9 mm (0.31 in)	65 years	35 of 100 (Notable)
21 May 1963	Conconully, US	daily high min	15.6 C (60.1 F)	3.9 C (7.0 F)	62 years	35 of 100 (Notable)
21 May 1963	Port Townsend, US	daily high max	29.4 C (84.9 F)	5.0 C (9.0 F)	48 years	35 of 100 (Notable)
21 May 1963	Snoqualmie Falls, US	monthly high max	34.4 C (93.9 F)	1.6 C (2.9 F)	55 years	35 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 1963

Records set or tied on this calendar date in each year from 1793 to 1963. 1963 had 598 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 1963-05-21: 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 20	460
20 to 40	12
40 to 60	3
60 to 80	2
80 to 100	1
100 to 120	1
120 to 140	1