Weather Records on 21 August 1964

794 weather records were set or tied worldwide on 21 August 1964. Highest significance: Lead, US.

Key Facts for 21 August 1964

On 21 August 1964, 794 weather records were set or tied at long-record stations worldwide.
88 were record highs and 449 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 48 monthly and 744 daily.
Lead set a monthly record daily precipitation of 102.6 mm (4.0 in) on 21 August 1964.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 448 records.

Record Map

794 stations

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

Weather records on 21 August 1964: highest significance records shown on the map
Station	Country	Type	Value	Significance
Lead	United States	Record daily precipitation	102.6 mm (4.0 in)	70 of 100 (Major)
Shahpura	India	Record daily precipitation	200.0 mm (7.9 in)	59 of 100 (Notable)
Amenia	United States	Record daily precipitation	75.2 mm (3.0 in)	59 of 100 (Notable)
Valley City 3 NNW	United States	Record daily precipitation	96.5 mm (3.8 in)	59 of 100 (Notable)
Ft Meade	United States	Record daily precipitation	46.7 mm (1.8 in)	57 of 100 (Notable)
Sharon	United States	Record daily precipitation	80.0 mm (3.1 in)	56 of 100 (Notable)
Colgate	United States	Record daily precipitation	85.1 mm (3.4 in)	54 of 100 (Notable)
Darlington Wwtp	United States	Record daily precipitation	88.4 mm (3.5 in)	53 of 100 (Notable)
Forman 5 SSE	United States	Record daily precipitation	67.1 mm (2.6 in)	52 of 100 (Notable)
Lisbon	United States	Record daily precipitation	80.3 mm (3.2 in)	52 of 100 (Notable)
Mayville	United States	Record daily precipitation	52.3 mm (2.1 in)	52 of 100 (Notable)
Hoopeston	United States	Record daily precipitation	58.7 mm (2.3 in)	49 of 100 (Notable)
Dodgeville Wwtp	United States	Record daily precipitation	119.1 mm (4.7 in)	49 of 100 (Notable)
Davenport L&D 15	United States	Record daily precipitation	70.1 mm (2.8 in)	49 of 100 (Notable)
Timiryazevskij	Russia	Record daily precipitation	97.2 mm (3.8 in)	47 of 100 (Notable)
Havana	United States	Record daily precipitation	73.7 mm (2.9 in)	47 of 100 (Notable)
Fayette	United States	Record daily precipitation	59.9 mm (2.4 in)	47 of 100 (Notable)
Courtenay 1 NW	United States	Record daily precipitation	54.1 mm (2.1 in)	47 of 100 (Notable)
Padampur	India	Record daily precipitation	83.8 mm (3.3 in)	46 of 100 (Notable)
Jokkmokk	Sweden	Record daily precipitation	34.5 mm (1.4 in)	46 of 100 (Notable)
Mt Pulaski	United States	Record daily precipitation	55.4 mm (2.2 in)	45 of 100 (Notable)
Hankinson	United States	Record daily precipitation	43.2 mm (1.7 in)	45 of 100 (Notable)
Sisseton	United States	Record daily precipitation	65.5 mm (2.6 in)	45 of 100 (Notable)
Spearfish	United States	Record daily precipitation	44.7 mm (1.8 in)	45 of 100 (Notable)
Hillsboro 3 N	United States	Record daily precipitation	57.9 mm (2.3 in)	44 of 100 (Notable)
Ludlow 3 SSE	United States	Record daily precipitation	33.0 mm (1.3 in)	43 of 100 (Notable)
Macomb	United States	Record daily precipitation	44.5 mm (1.8 in)	42 of 100 (Notable)
Cooperstown	United States	Record daily precipitation	106.9 mm (4.2 in)	42 of 100 (Notable)
Havana	United States	Record daily precipitation	64.3 mm (2.5 in)	41 of 100 (Notable)
Sparta 1 W	United States	Record daily precipitation	67.1 mm (2.6 in)	40 of 100 (Notable)
Ft Madison	United States	Record daily precipitation	41.4 mm (1.6 in)	40 of 100 (Notable)
Kirksville	United States	Record daily precipitation	42.7 mm (1.7 in)	40 of 100 (Notable)
Muscoda	United States	Record daily precipitation	61.5 mm (2.4 in)	40 of 100 (Notable)
Wrixum/Fohr	Germany	Record low minimum temperature	6.0 C (42.8 F)	39 of 100 (Notable)
Panskura	India	Record daily precipitation	110.7 mm (4.4 in)	39 of 100 (Notable)
Fessenden	United States	Record daily precipitation	31.0 mm (1.2 in)	39 of 100 (Notable)
Karera	India	Record daily precipitation	119.2 mm (4.7 in)	38 of 100 (Notable)
Loup City	United States	Record daily precipitation	42.2 mm (1.7 in)	38 of 100 (Notable)
Tekamah	United States	Record daily precipitation	35.6 mm (1.4 in)	38 of 100 (Notable)
Minas Nuevas	Mexico	Record low minimum temperature	14.4 C (57.9 F)	37 of 100 (Notable)
Hansboro 4 NNE	United States	Record daily precipitation	35.6 mm (1.4 in)	37 of 100 (Notable)
Oak Ridges	Canada	Record daily precipitation	50.3 mm (2.0 in)	36 of 100 (Notable)
Toronto	Canada	Record low maximum temperature	16.1 C (61.0 F)	36 of 100 (Notable)
Freeport	United States	Record daily precipitation	45.7 mm (1.8 in)	36 of 100 (Notable)
Delaware 3 WSW	United States	Record daily precipitation	35.1 mm (1.4 in)	36 of 100 (Notable)
Beardsley	United States	Record daily precipitation	86.9 mm (3.4 in)	36 of 100 (Notable)
West Bend	United States	Record daily precipitation	41.7 mm (1.6 in)	36 of 100 (Notable)
Spencer 10 NE	United States	Record low maximum temperature	13.9 C (57.0 F)	36 of 100 (Notable)
Sundance	United States	Record daily precipitation	71.1 mm (2.8 in)	36 of 100 (Notable)
Salzburg	Austria	Record low minimum temperature	7.4 C (45.3 F)	35 of 100 (Notable)
Durham	Canada	Record low maximum temperature	13.9 C (57.0 F)	35 of 100 (Notable)
Dublin Phoenix Park	Ireland	Record low minimum temperature	3.0 C (37.4 F)	35 of 100 (Notable)
Glenwood Spgs #2	United States	Record low minimum temperature	0.0 C (32.0 F)	35 of 100 (Notable)
Montpelier Rs	United States	Record low maximum temperature	16.1 C (61.0 F)	35 of 100 (Notable)
Golden	United States	Record daily precipitation	79.2 mm (3.1 in)	35 of 100 (Notable)
Kahoka	United States	Record daily precipitation	85.6 mm (3.4 in)	35 of 100 (Notable)
Guna	India	Record daily precipitation	112.0 mm (4.4 in)	34 of 100 (Routine)
Bhopal	India	Record daily precipitation	113.3 mm (4.5 in)	34 of 100 (Routine)
Iglas	India	Record daily precipitation	57.0 mm (2.2 in)	34 of 100 (Routine)
Castle Rock	United States	Record low minimum temperature	2.2 C (36.0 F)	34 of 100 (Routine)

Counts by Type and Timescale

794 records

Records set or tied on 21 August 1964 by type: Highest daily maximum 20, Lowest daily maximum 271, Highest daily minimum 68, Lowest daily minimum 178, Heaviest daily rainfall 257.

Records on 21 August 1964 by type
Record type	Records
Highest daily maximum	20
Lowest daily maximum	271
Highest daily minimum	68
Lowest daily minimum	178
Heaviest daily rainfall	257
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 1964 by timescale: all-time 2, monthly 48, daily 744.

How Much Records Were Beaten By

648 broken records

Margins by which the 648 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 118.5. Ties are not counted.

Top 20 by Significance

21 August 1964

Top 20 records on 21 August 1964 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1964	Lead, US	monthly rain	102.6 mm (4.0 in)	55.1 mm (2.2 in)	51 years	70 of 100 (Major)
21 August 1964	Shahpura, IN	daily rain	200.0 mm (7.9 in)	118.5 mm (4.7 in)	49 years	59 of 100 (Notable)
21 August 1964	Amenia, US	daily rain	75.2 mm (3.0 in)	49.8 mm (2.0 in)	40 years	59 of 100 (Notable)
21 August 1964	Valley City 3 NNW, US	daily rain	96.5 mm (3.8 in)	88.6 mm (3.5 in)	43 years	59 of 100 (Notable)
21 August 1964	Ft Meade, US	daily rain	46.7 mm (1.8 in)	39.1 mm (1.5 in)	58 years	57 of 100 (Notable)
21 August 1964	Sharon, US	daily rain	80.0 mm (3.1 in)	66.3 mm (2.6 in)	40 years	56 of 100 (Notable)
21 August 1964	Colgate, US	monthly rain	85.1 mm (3.4 in)	27.9 mm (1.1 in)	46 years	54 of 100 (Notable)
21 August 1964	Darlington Wwtp, US	daily rain	88.4 mm (3.5 in)	52.8 mm (2.1 in)	60 years	53 of 100 (Notable)
21 August 1964	Forman 5 SSE, US	daily rain	67.1 mm (2.6 in)	42.2 mm (1.7 in)	40 years	52 of 100 (Notable)
21 August 1964	Lisbon, US	daily rain	80.3 mm (3.2 in)	45.5 mm (1.8 in)	40 years	52 of 100 (Notable)
21 August 1964	Mayville, US	daily rain	52.3 mm (2.1 in)	36.3 mm (1.4 in)	65 years	52 of 100 (Notable)
21 August 1964	Hoopeston, US	daily rain	58.7 mm (2.3 in)	40.9 mm (1.6 in)	49 years	49 of 100 (Notable)
21 August 1964	Dodgeville Wwtp, US	monthly rain	119.1 mm (4.7 in)	46.2 mm (1.8 in)	1 year	49 of 100 (Notable)
21 August 1964	Davenport L&D 15, US	daily rain	70.1 mm (2.8 in)	51.3 mm (2.0 in)	27 years	49 of 100 (Notable)
21 August 1964	Timiryazevskij, RU	daily rain	97.2 mm (3.8 in)	70.0 mm (2.8 in)	7 years	47 of 100 (Notable)
21 August 1964	Havana, US	daily rain	73.7 mm (2.9 in)	56.4 mm (2.2 in)	12 years	47 of 100 (Notable)
21 August 1964	Fayette, US	daily rain	59.9 mm (2.4 in)	31.5 mm (1.2 in)	60 years	47 of 100 (Notable)
21 August 1964	Courtenay 1 NW, US	daily rain	54.1 mm (2.1 in)	42.2 mm (1.7 in)	28 years	47 of 100 (Notable)
21 August 1964	Padampur, IN	daily rain	83.8 mm (3.3 in)	62.2 mm (2.4 in)	25 years	46 of 100 (Notable)
21 August 1964	Jokkmokk, SE	daily rain	34.5 mm (1.4 in)	13.1 mm (0.5 in)	48 years	46 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

1800 to 1964

Records set or tied on this calendar date in each year from 1800 to 1964. 1964 had 794 records.

Counts for years before the ledger starts come from the same station rules.

Records on 08-21 in each year
Year	Records
1800	1
1802	1
1804	1
1807	1
1816	1
1818	1
1832	1
1834	1
1839	3
1843	1
1847	1
1849	3
1850	1
1851	2
1863	1
1866	1
1867	2
1870	3
1871	2
1872	1
1873	1
1876	1
1877	2
1879	2
1884	2
1885	5
1886	1
1887	5
1888	2
1889	3
1890	4
1891	2
1893	4
1894	8
1895	3
1896	2
1897	4
1898	4
1899	7
1900	4
1901	9
1902	8
1903	6
1904	8
1905	4
1906	22
1907	20
1908	13
1909	17
1910	33
1911	19
1912	50
1913	37
1914	24
1915	21
1916	106
1917	101
1918	202
1919	19
1920	59
1921	34
1922	58
1923	111
1924	135
1925	220
1926	227
1927	228
1928	110
1929	234
1930	297
1931	277
1932	264
1933	328
1934	320
1935	318
1936	807
1937	762
1938	239
1939	630
1940	683
1941	180
1942	415
1943	438
1944	346
1945	544
1946	390
1947	954
1948	305
1949	508
1950	958
1951	699
1952	368
1953	331
1954	497
1955	885
1956	701
1957	490
1958	389
1959	704
1960	490
1961	644
1962	469
1963	338
1964	794
1965	455
1966	661
1967	541
1968	1,014
1969	650
1970	373
1971	660
1972	441
1973	438
1974	564
1975	545
1976	756
1977	764
1978	445
1979	778
1980	904
1981	1,015
1982	769
1983	1,407
1984	975
1985	623
1986	1,166
1987	740
1988	889
1989	828
1990	910
1991	828
1992	957
1993	698
1994	968
1995	962
1996	950
1997	1,291
1998	948
1999	717
2000	861
2001	797
2002	965
2003	1,241
2004	1,585
2005	1,071
2006	797
2007	1,829
2008	1,012
2009	1,319
2010	1,155
2011	1,022
2012	990
2013	513
2014	624
2015	651
2016	890
2017	347
2018	816
2019	631
2020	1,147
2021	767
2022	917
2023	1,826
2024	777
2025	1,230
2026	1,289

Download the Data

Data for records on 1964-08-21: 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	581
20 to 40	46
40 to 60	15
60 to 80	4
80 to 100	1
100 to 120	1