Weather Records on 21 August 1974

564 weather records were set or tied worldwide on 21 August 1974. Highest significance: Simao Dias (Anapolis), BR.

Key Facts for 21 August 1974

On 21 August 1974, 564 weather records were set or tied at long-record stations worldwide.
103 were record highs and 262 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 18 monthly and 546 daily.
Simao Dias (Anapolis) set a monthly record daily precipitation of 88.0 mm (3.5 in) on 21 August 1974.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 449 records.

Record Map

564 stations

564 station records on 21 August 1974 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 1974: highest significance records shown on the map
Station	Country	Type	Value	Significance
Simao Dias (Anapolis)	Brazil	Record daily precipitation	88.0 mm (3.5 in)	74 of 100 (Major)
McGregor (Pol)	South Africa	Record daily precipitation	47.5 mm (1.9 in)	66 of 100 (Major)
Sanborn	United States	Record daily precipitation	99.8 mm (3.9 in)	60 of 100 (Major)
Pedro Alexandre (Voturuna)	Brazil	Record daily precipitation	72.2 mm (2.8 in)	56 of 100 (Notable)
Montagu (Pol)	South Africa	Record daily precipitation	53.0 mm (2.1 in)	53 of 100 (Notable)
Nossa Senhora da Gloria	Brazil	Record daily precipitation	48.0 mm (1.9 in)	52 of 100 (Notable)
Irgiz	Kazakhstan	Record daily precipitation	39.1 mm (1.5 in)	52 of 100 (Notable)
Primghar	United States	Record daily precipitation	90.4 mm (3.6 in)	52 of 100 (Notable)
Zagreb-Gric	Croatia	Record daily precipitation	47.3 mm (1.9 in)	50 of 100 (Notable)
Sibley	United States	Record daily precipitation	61.2 mm (2.4 in)	50 of 100 (Notable)
Perpignan	France	Record daily precipitation	58.2 mm (2.3 in)	49 of 100 (Notable)
Euclides da Cunha (Cumbe)	Brazil	Record daily precipitation	25.3 mm (1.0 in)	47 of 100 (Notable)
Cipo de Leite	Brazil	Record daily precipitation	39.0 mm (1.5 in)	46 of 100 (Notable)
Cicero Dantas	Brazil	Record daily precipitation	56.0 mm (2.2 in)	46 of 100 (Notable)
Tobias Barreto	Brazil	Record daily precipitation	50.5 mm (2.0 in)	46 of 100 (Notable)
Estancia	Brazil	Record daily precipitation	100.0 mm (3.9 in)	44 of 100 (Notable)
Emmetsburg	United States	Record daily precipitation	38.6 mm (1.5 in)	43 of 100 (Notable)
Caribou 2 S	United States	Record daily precipitation	46.7 mm (1.8 in)	43 of 100 (Notable)
Medicine Lake 3 SE	United States	Record daily precipitation	40.9 mm (1.6 in)	43 of 100 (Notable)
Swellendam (Tnk)	South Africa	Record daily precipitation	54.5 mm (2.1 in)	42 of 100 (Notable)
Rainier Paradise Rs	United States	Record snow depth	30.5 cm (12.0 in)	42 of 100 (Notable)
Springbok	South Africa	Record daily precipitation	39.0 mm (1.5 in)	41 of 100 (Notable)
Bulgroo Station	Australia	Record daily precipitation	29.0 mm (1.1 in)	40 of 100 (Notable)
Barrydale (Pol)	South Africa	Record daily precipitation	52.5 mm (2.1 in)	40 of 100 (Notable)
Japaratuba	Brazil	Record daily precipitation	35.2 mm (1.4 in)	38 of 100 (Notable)
Mayaguez City	Puerto Rico [United States]	Record low minimum temperature	16.1 C (61.0 F)	38 of 100 (Notable)
Rangely 1E	United States	Record high minimum temperature	19.4 C (66.9 F)	37 of 100 (Notable)
Mohall	United States	Record daily precipitation	31.5 mm (1.2 in)	37 of 100 (Notable)
Kamiesberg	South Africa	Record daily precipitation	61.2 mm (2.4 in)	36 of 100 (Notable)
Culbertson	United States	Record daily precipitation	34.3 mm (1.4 in)	36 of 100 (Notable)
Itabaianinha	Brazil	Record daily precipitation	72.0 mm (2.8 in)	35 of 100 (Notable)
Brandon Cda	Canada	Record low maximum temperature	13.3 C (55.9 F)	35 of 100 (Notable)
Eckman 2 SE	United States	Record daily precipitation	42.4 mm (1.7 in)	35 of 100 (Notable)
Milford 4 NW	United States	Record daily precipitation	53.3 mm (2.1 in)	34 of 100 (Routine)
White River	Canada	Record high minimum temperature	18.3 C (64.9 F)	33 of 100 (Routine)
Smoky Falls	Canada	Record daily precipitation	36.1 mm (1.4 in)	33 of 100 (Routine)
Tussenbeide	South Africa	Record daily precipitation	69.0 mm (2.7 in)	33 of 100 (Routine)
Bottineau	United States	Record daily precipitation	50.8 mm (2.0 in)	33 of 100 (Routine)
Fillmore	United States	Record low minimum temperature	3.9 C (39.0 F)	33 of 100 (Routine)
Laketown	United States	Record low minimum temperature	-1.7 C (28.9 F)	33 of 100 (Routine)
Ely AP	United States	Record low minimum temperature	-1.7 C (28.9 F)	33 of 100 (Routine)
Sherwood Park Station	Australia	Record daily precipitation	36.0 mm (1.4 in)	32 of 100 (Routine)
Cruz Do Espirito Santo	Brazil	Record daily precipitation	25.3 mm (1.0 in)	32 of 100 (Routine)
Cochrane	Canada	Record high minimum temperature	18.9 C (66.0 F)	32 of 100 (Routine)
Timovskoe	Russia	Record low maximum temperature	13.6 C (56.5 F)	32 of 100 (Routine)
Windom	United States	Record daily precipitation	35.1 mm (1.4 in)	32 of 100 (Routine)
Vestervig	Denmark	Record low minimum temperature	6.7 C (44.1 F)	31 of 100 (Routine)
Camargo (Smn)	Mexico	Record daily precipitation	39.9 mm (1.6 in)	31 of 100 (Routine)
Jimenez (Smn)	Mexico	Record high minimum temperature	20.0 C (68.0 F)	31 of 100 (Routine)
Tabl.Mtn Molteno Rsv	South Africa	Record daily precipitation	56.5 mm (2.2 in)	31 of 100 (Routine)
Fairfield	United States	Record daily precipitation	28.2 mm (1.1 in)	31 of 100 (Routine)
Lake Park 3SSE	United States	Record daily precipitation	70.6 mm (2.8 in)	31 of 100 (Routine)
Tecumseh 1S	United States	Record high minimum temperature	23.9 C (75.0 F)	31 of 100 (Routine)
Fabens	United States	Record daily precipitation	27.9 mm (1.1 in)	31 of 100 (Routine)
Soldier Summit	United States	Record low minimum temperature	-3.9 C (25.0 F)	31 of 100 (Routine)
Coalville	United States	Record low minimum temperature	-4.4 C (24.1 F)	31 of 100 (Routine)
Lankeys Creek (Woodridge)	Australia	Record daily precipitation	25.0 mm (1.0 in)	30 of 100 (Routine)
Haileybury	Canada	Record high minimum temperature	22.8 C (73.0 F)	30 of 100 (Routine)
Robertson	South Africa	Record daily precipitation	26.0 mm (1.0 in)	30 of 100 (Routine)
Canelo 1 NW	United States	Record low minimum temperature	9.4 C (48.9 F)	30 of 100 (Routine)

Counts by Type and Timescale

564 records

Records set or tied on 21 August 1974 by type: Highest daily maximum 53, Lowest daily maximum 119, Highest daily minimum 50, Lowest daily minimum 143, Heaviest daily rainfall 196, Heaviest daily snowfall 2, Deepest snow cover 1.

Records on 21 August 1974 by type
Record type	Records
Highest daily maximum	53
Lowest daily maximum	119
Highest daily minimum	50
Lowest daily minimum	143
Heaviest daily rainfall	196
Heaviest daily snowfall	2
Deepest snow cover	1

Records on 21 August 1974 by timescale: all-time 0, monthly 18, daily 546.

How Much Records Were Beaten By

450 broken records

Margins by which the 450 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 305.0. Ties are not counted.

Top 20 by Significance

21 August 1974

Top 20 records on 21 August 1974 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1974	Simao Dias (Anapolis), BR	monthly rain	88.0 mm (3.5 in)	30.6 mm (1.2 in)	60 years	74 of 100 (Major)
21 August 1974	McGregor (Pol), ZA	daily rain	47.5 mm (1.9 in)	40.9 mm (1.6 in)	64 years	66 of 100 (Major)
21 August 1974	Sanborn, US	daily rain	99.8 mm (3.9 in)	55.9 mm (2.2 in)	52 years	60 of 100 (Major)
21 August 1974	Pedro Alexandre (Voturuna), BR	monthly rain	72.2 mm (2.8 in)	42.1 mm (1.7 in)	10 years	56 of 100 (Notable)
21 August 1974	Montagu (Pol), ZA	daily rain	53.0 mm (2.1 in)	31.7 mm (1.2 in)	52 years	53 of 100 (Notable)
21 August 1974	Nossa Senhora da Gloria, BR	monthly rain	48.0 mm (1.9 in)	16.0 mm (0.6 in)	38 years	52 of 100 (Notable)
21 August 1974	Irgiz, KZ	monthly rain	39.1 mm (1.5 in)	15.8 mm (0.6 in)	15 years	52 of 100 (Notable)
21 August 1974	Primghar, US	daily rain	90.4 mm (3.6 in)	63.0 mm (2.5 in)	29 years	52 of 100 (Notable)
21 August 1974	Zagreb-Gric, HR	daily rain	47.3 mm (1.9 in)	11.0 mm (0.4 in)	107 years	50 of 100 (Notable)
21 August 1974	Sibley, US	daily rain	61.2 mm (2.4 in)	25.4 mm (1.0 in)	77 years	50 of 100 (Notable)
21 August 1974	Perpignan, FR	daily rain	58.2 mm (2.3 in)	38.6 mm (1.5 in)	8 years	49 of 100 (Notable)
21 August 1974	Euclides da Cunha (Cumbe), BR	daily rain	25.3 mm (1.0 in)	16.0 mm (0.6 in)	49 years	47 of 100 (Notable)
21 August 1974	Cipo de Leite, BR	monthly rain	39.0 mm (1.5 in)	14.0 mm (0.6 in)	14 years	46 of 100 (Notable)
21 August 1974	Cicero Dantas, BR	daily rain	56.0 mm (2.2 in)	40.0 mm (1.6 in)	0 years	46 of 100 (Notable)
21 August 1974	Tobias Barreto, BR	daily rain	50.5 mm (2.0 in)	25.5 mm (1.0 in)	0 years	46 of 100 (Notable)
21 August 1974	Estancia, BR	monthly rain	100.0 mm (3.9 in)	12.0 mm (0.5 in)	51 years	44 of 100 (Notable)
21 August 1974	Emmetsburg, US	daily rain	38.6 mm (1.5 in)	15.7 mm (0.6 in)	80 years	43 of 100 (Notable)
21 August 1974	Caribou 2 S, US	daily rain	46.7 mm (1.8 in)	43.9 mm (1.7 in)	1 year	43 of 100 (Notable)
21 August 1974	Medicine Lake 3 SE, US	daily rain	40.9 mm (1.6 in)	15.5 mm (0.6 in)	56 years	43 of 100 (Notable)
21 August 1974	Swellendam (Tnk), ZA	daily rain	54.5 mm (2.1 in)	27.8 mm (1.1 in)	35 years	42 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 1974

Records set or tied on this calendar date in each year from 1800 to 1974. 1974 had 564 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	768
2022	917
2023	1,826
2024	777
2025	1,230
2026	1,291

Download the Data

Data for records on 1974-08-21: 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 50	447
50 to 100	2
100 to 150	0
150 to 200	0
200 to 250	0
250 to 300	0
300 to 350	1