Weather Records on 21 May 1964

788 weather records were set or tied worldwide on 21 May 1964. Highest significance: Haidargarh, IN.

Key Facts for 21 May 1964

On 21 May 1964, 788 weather records were set or tied at long-record stations worldwide.
524 were record highs and 113 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 29 monthly and 759 daily.
Haidargarh set a daily record precipitation of 41.2 mm (1.6 in) on 21 May 1964.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 458 records.

Record Map

788 stations

788 station records on 21 May 1964 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1964: highest significance records shown on the map
Station	Country	Type	Value	Significance
Haidargarh	India	Record daily precipitation	41.2 mm (1.6 in)	61 of 100 (Major)
Paliganj	India	Record daily precipitation	95.0 mm (3.7 in)	60 of 100 (Major)
Fort Chipewyan	Canada	Record daily precipitation	31.0 mm (1.2 in)	57 of 100 (Notable)
Bihar	India	Record daily precipitation	44.8 mm (1.8 in)	54 of 100 (Notable)
Ballia	India	Record daily precipitation	45.2 mm (1.8 in)	52 of 100 (Notable)
Jaunpur	India	Record daily precipitation	29.5 mm (1.2 in)	52 of 100 (Notable)
Jhunjhunu	India	Record daily precipitation	49.0 mm (1.9 in)	50 of 100 (Notable)
Acude Riachao	Brazil	Record daily precipitation	65.4 mm (2.6 in)	49 of 100 (Notable)
Koath	India	Record daily precipitation	48.8 mm (1.9 in)	49 of 100 (Notable)
Chapra Obsy Sr	India	Record daily precipitation	58.6 mm (2.3 in)	48 of 100 (Notable)
Bumping Lake	United States	Record daily precipitation	33.0 mm (1.3 in)	48 of 100 (Notable)
Phulwari	India	Record daily precipitation	42.2 mm (1.7 in)	43 of 100 (Notable)
Ghosi	India	Record daily precipitation	33.8 mm (1.3 in)	43 of 100 (Notable)
Mussoorie	India	Record daily precipitation	32.2 mm (1.3 in)	43 of 100 (Notable)
Chakaibanda	India	Record daily precipitation	42.7 mm (1.7 in)	41 of 100 (Notable)
Landsburg	United States	Record daily precipitation	41.9 mm (1.6 in)	39 of 100 (Notable)
Sarajevo	Bosnia and Herzegovina	Record daily precipitation	36.0 mm (1.4 in)	36 of 100 (Notable)
Fairview	Canada	Record daily precipitation	39.4 mm (1.6 in)	36 of 100 (Notable)
Barh	India	Record daily precipitation	75.0 mm (3.0 in)	36 of 100 (Notable)
Langdon Exp Farm	United States	Record high minimum temperature	18.3 C (64.9 F)	36 of 100 (Notable)
Aracati	Brazil	Record daily precipitation	46.8 mm (1.8 in)	35 of 100 (Notable)
Ft Lauderdale	United States	Record daily precipitation	108.5 mm (4.3 in)	35 of 100 (Notable)
Kallatty	India	Record daily precipitation	125.0 mm (4.9 in)	34 of 100 (Routine)
Cooperstown	United States	Record high maximum temperature	36.7 C (98.1 F)	34 of 100 (Routine)
Kerakat	India	Record daily precipitation	26.4 mm (1.0 in)	33 of 100 (Routine)
Lucknow	India	Record daily precipitation	26.8 mm (1.1 in)	33 of 100 (Routine)
Biloxi	United States	Record high maximum temperature	34.4 C (93.9 F)	33 of 100 (Routine)
Manchester	United States	Record low minimum temperature	1.1 C (34.0 F)	33 of 100 (Routine)
Portal	United States	Record high maximum temperature	35.0 C (95.0 F)	33 of 100 (Routine)
Buxar	India	Record daily precipitation	30.2 mm (1.2 in)	32 of 100 (Routine)
Crookston NW Exp STN	United States	Record high minimum temperature	18.3 C (64.9 F)	32 of 100 (Routine)
Hillsboro 3 N	United States	Record high minimum temperature	20.0 C (68.0 F)	32 of 100 (Routine)
Intl Falls Intl AP	United States	Record high maximum temperature	35.0 C (95.0 F)	32 of 100 (Routine)
Robe Comparison	Australia	Record high minimum temperature	14.0 C (57.2 F)	31 of 100 (Routine)
Gudauri	Georgia	Record daily precipitation	54.0 mm (2.1 in)	31 of 100 (Routine)
Thief River Falls	United States	Record high maximum temperature	37.8 C (100.0 F)	31 of 100 (Routine)
Pine Ridge	United States	Record high maximum temperature	36.1 C (97.0 F)	31 of 100 (Routine)
Dilley	United States	Record daily precipitation	49.8 mm (2.0 in)	31 of 100 (Routine)
Touros	Brazil	Record daily precipitation	91.2 mm (3.6 in)	30 of 100 (Routine)
Jamestown State Hosp	United States	Record high minimum temperature	17.2 C (63.0 F)	30 of 100 (Routine)
Granville	United States	Record high minimum temperature	18.9 C (66.0 F)	29 of 100 (Routine)
Westhope	United States	Record high minimum temperature	16.7 C (62.1 F)	29 of 100 (Routine)
Tyndall	United States	Record high minimum temperature	20.6 C (69.1 F)	29 of 100 (Routine)
Palmer 3 ESE	United States	Record daily precipitation	47.2 mm (1.9 in)	29 of 100 (Routine)
Indian Head Cda	Canada	Record high minimum temperature	13.9 C (57.0 F)	28 of 100 (Routine)
Kapuskasing Cda	Canada	Record daily precipitation	33.0 mm (1.3 in)	28 of 100 (Routine)
Caledonia	United States	Record high maximum temperature	30.0 C (86.0 F)	28 of 100 (Routine)
Pearlington	United States	Record high maximum temperature	34.4 C (93.9 F)	28 of 100 (Routine)
Hansboro 4 NNE	United States	Record high minimum temperature	16.1 C (61.0 F)	28 of 100 (Routine)
Yellowstone Park Mammoth	United States	Record high minimum temperature	11.1 C (52.0 F)	28 of 100 (Routine)
Griffiss AFB	United States	Record low minimum temperature	-0.6 C (30.9 F)	28 of 100 (Routine)
Talkeetna AP	United States	Record daily snowfall	6.1 cm (2.4 in)	28 of 100 (Routine)
Santana Do Matos	Brazil	Record daily precipitation	26.4 mm (1.0 in)	27 of 100 (Routine)
Victoria Gonzales Hts	Canada	Record low maximum temperature	9.4 C (48.9 F)	27 of 100 (Routine)
Mine Centre	Canada	Record high maximum temperature	34.4 C (93.9 F)	27 of 100 (Routine)
Belle Isle	Canada	Record daily snowfall	7.6 cm (3.0 in)	27 of 100 (Routine)
Pablillo (Smn)	Mexico	Record daily precipitation	81.8 mm (3.2 in)	27 of 100 (Routine)
Pembina	United States	Record high minimum temperature	16.1 C (61.0 F)	27 of 100 (Routine)
Neemkathana	India	Record daily precipitation	26.7 mm (1.1 in)	26 of 100 (Routine)
Storlien	Sweden	Record high maximum temperature	18.0 C (64.4 F)	26 of 100 (Routine)

Counts by Type and Timescale

788 records

Records set or tied on 21 May 1964 by type: Highest daily maximum 304, Lowest daily maximum 46, Highest daily minimum 220, Lowest daily minimum 67, Heaviest daily rainfall 145, Heaviest daily snowfall 6.

Records on 21 May 1964 by type
Record type	Records
Highest daily maximum	304
Lowest daily maximum	46
Highest daily minimum	220
Lowest daily minimum	67
Heaviest daily rainfall	145
Heaviest daily snowfall	6
Deepest snow cover	0

Records on 21 May 1964 by timescale: all-time 0, monthly 29, daily 759.

How Much Records Were Beaten By

592 broken records

Margins by which the 592 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 95.0. Ties are not counted.

Top 20 by Significance

21 May 1964

Top 20 records on 21 May 1964 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1964	Haidargarh, IN	daily rain	41.2 mm (1.6 in)	36.1 mm (1.4 in)	51 years	61 of 100 (Major)
21 May 1964	Paliganj, IN	daily rain	95.0 mm (3.7 in)	95.0 mm (3.7 in)	50 years	60 of 100 (Major)
21 May 1964	Fort Chipewyan, CA	daily rain	31.0 mm (1.2 in)	23.6 mm (0.9 in)	32 years	57 of 100 (Notable)
21 May 1964	Bihar, IN	daily rain	44.8 mm (1.8 in)	40.2 mm (1.6 in)	51 years	54 of 100 (Notable)
21 May 1964	Ballia, IN	daily rain	45.2 mm (1.8 in)	34.0 mm (1.3 in)	52 years	52 of 100 (Notable)
21 May 1964	Jaunpur, IN	daily rain	29.5 mm (1.2 in)	25.4 mm (1.0 in)	52 years	52 of 100 (Notable)
21 May 1964	Jhunjhunu, IN	monthly rain	49.0 mm (1.9 in)	12.2 mm (0.5 in)	51 years	50 of 100 (Notable)
21 May 1964	Acude Riachao, BR	daily rain	65.4 mm (2.6 in)	50.0 mm (2.0 in)	29 years	49 of 100 (Notable)
21 May 1964	Koath, IN	daily rain	48.8 mm (1.9 in)	39.1 mm (1.5 in)	51 years	49 of 100 (Notable)
21 May 1964	Chapra Obsy Sr, IN	monthly rain	58.6 mm (2.3 in)	17.5 mm (0.7 in)	52 years	48 of 100 (Notable)
21 May 1964	Bumping Lake, US	daily rain	33.0 mm (1.3 in)	24.4 mm (1.0 in)	11 years	48 of 100 (Notable)
21 May 1964	Phulwari, IN	daily rain	42.2 mm (1.7 in)	42.2 mm (1.7 in)	50 years	43 of 100 (Notable)
21 May 1964	Ghosi, IN	daily rain	33.8 mm (1.3 in)	33.8 mm (1.3 in)	59 years	43 of 100 (Notable)
21 May 1964	Mussoorie, IN	daily rain	32.2 mm (1.3 in)	22.5 mm (0.9 in)	47 years	43 of 100 (Notable)
21 May 1964	Chakaibanda, IN	daily rain	42.7 mm (1.7 in)	23.1 mm (0.9 in)	56 years	41 of 100 (Notable)
21 May 1964	Landsburg, US	daily rain	41.9 mm (1.6 in)	20.8 mm (0.8 in)	11 years	39 of 100 (Notable)
21 May 1964	Sarajevo, BA	daily rain	36.0 mm (1.4 in)	18.8 mm (0.7 in)	16 years	36 of 100 (Notable)
21 May 1964	Fairview, CA	monthly rain	39.4 mm (1.6 in)	9.2 mm (0.36 in)	25 years	36 of 100 (Notable)
21 May 1964	Barh, IN	monthly rain	75.0 mm (3.0 in)	14.0 mm (0.6 in)	27 years	36 of 100 (Notable)
21 May 1964	Langdon Exp Farm, US	daily high min	18.3 C (64.9 F)	6.1 C (11.0 F)	60 years	36 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 1964

Records set or tied on this calendar date in each year from 1793 to 1964. 1964 had 788 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 1964-05-21: 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	564
20 to 40	21
40 to 60	4
60 to 80	2
80 to 100	1