Weather Records on 21 August 1984

975 weather records were set or tied worldwide on 21 August 1984. Highest significance: Deal Island, AU.

Key Facts for 21 August 1984

On 21 August 1984, 975 weather records were set or tied at long-record stations worldwide.
198 were record highs and 187 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 25 monthly and 949 daily.
Deal Island set a daily record precipitation of 26.0 mm (1.0 in) on 21 August 1984.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 447 records.

Record Map

975 stations

975 station records on 21 August 1984 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Deal Island	Australia	Record daily precipitation	26.0 mm (1.0 in)	62 of 100 (Major)
Iacri	Brazil	Record daily precipitation	72.5 mm (2.9 in)	61 of 100 (Major)
Ellery Lake	United States	Record daily precipitation	38.6 mm (1.5 in)	59 of 100 (Notable)
Cafelandia	Brazil	Record daily precipitation	36.2 mm (1.4 in)	58 of 100 (Notable)
Rinopolis	Brazil	Record daily precipitation	73.9 mm (2.9 in)	58 of 100 (Notable)
Atkinson 3SW	United States	Record daily precipitation	57.2 mm (2.3 in)	58 of 100 (Notable)
Chiltern (Post Office)	Australia	Record daily precipitation	39.0 mm (1.5 in)	56 of 100 (Notable)
Wilsons Promontory Lighthouse	Australia	Record daily precipitation	42.8 mm (1.7 in)	56 of 100 (Notable)
Promissao	Brazil	Record daily precipitation	40.5 mm (1.6 in)	56 of 100 (Notable)
Altair	Brazil	Record daily precipitation	36.7 mm (1.4 in)	55 of 100 (Notable)
Dandongadale (Mountain View)	Australia	Record daily precipitation	67.6 mm (2.7 in)	54 of 100 (Notable)
Beechworth Composite	Australia	Record daily precipitation	48.0 mm (1.9 in)	53 of 100 (Notable)
Elmore	Australia	Record daily precipitation	29.6 mm (1.2 in)	52 of 100 (Notable)
Fazenda Bom Retiro	Brazil	Record daily precipitation	70.0 mm (2.8 in)	52 of 100 (Notable)
Eurobin	Australia	Record daily precipitation	58.0 mm (2.3 in)	51 of 100 (Notable)
Usina Avanhandava (Cpfl)	Brazil	Record daily precipitation	37.7 mm (1.5 in)	51 of 100 (Notable)
Grand Lake 1 NW	United States	Record daily precipitation	39.9 mm (1.6 in)	51 of 100 (Notable)
Abilene	United States	Record daily precipitation	94.0 mm (3.7 in)	51 of 100 (Notable)
Corowa Airport	Australia	Record daily precipitation	31.0 mm (1.2 in)	50 of 100 (Notable)
Nagambie (Goulburn Weir)	Australia	Record daily precipitation	29.0 mm (1.1 in)	50 of 100 (Notable)
Castores	Brazil	Record daily precipitation	47.8 mm (1.9 in)	50 of 100 (Notable)
Lobethal	Australia	Record daily precipitation	40.8 mm (1.6 in)	49 of 100 (Notable)
Berrigan Post Office	Australia	Record daily precipitation	26.5 mm (1.0 in)	49 of 100 (Notable)
Corryong (Parish Lane)	Australia	Record daily precipitation	32.4 mm (1.3 in)	49 of 100 (Notable)
Ust-Uda	Russia	Record daily precipitation	43.9 mm (1.7 in)	49 of 100 (Notable)
Yackandandah	Australia	Record daily precipitation	53.0 mm (2.1 in)	48 of 100 (Notable)
Fazenda Chantebled	Brazil	Record daily precipitation	33.0 mm (1.3 in)	48 of 100 (Notable)
Potirendaba	Brazil	Record daily precipitation	31.6 mm (1.2 in)	48 of 100 (Notable)
Bay Springs	United States	Record daily precipitation	61.5 mm (2.4 in)	48 of 100 (Notable)
Rutherglen Research	Australia	Record daily precipitation	31.2 mm (1.2 in)	47 of 100 (Notable)
Strathbogie North	Australia	Record daily precipitation	61.4 mm (2.4 in)	47 of 100 (Notable)
Alto Alegre	Brazil	Record daily precipitation	40.0 mm (1.6 in)	47 of 100 (Notable)
Pompeia	Brazil	Record daily precipitation	36.3 mm (1.4 in)	46 of 100 (Notable)
Mingo 6E	United States	Record daily precipitation	59.9 mm (2.4 in)	46 of 100 (Notable)
Sterlington	United States	Record daily precipitation	94.2 mm (3.7 in)	46 of 100 (Notable)
Goorambat	Australia	Record daily precipitation	26.2 mm (1.0 in)	45 of 100 (Notable)
Yarrawonga Post Office	Australia	Record daily precipitation	27.4 mm (1.1 in)	44 of 100 (Notable)
Pitangueiras	Brazil	Record daily precipitation	26.8 mm (1.1 in)	44 of 100 (Notable)
Balagansk	Russia	Record daily precipitation	44.0 mm (1.7 in)	44 of 100 (Notable)
Batlow Post Office	Australia	Record daily precipitation	54.1 mm (2.1 in)	43 of 100 (Notable)
Wooragee	Australia	Record daily precipitation	42.4 mm (1.7 in)	43 of 100 (Notable)
Quinter	United States	Record daily precipitation	71.4 mm (2.8 in)	43 of 100 (Notable)
Monte Alto	Brazil	Record daily precipitation	33.2 mm (1.3 in)	42 of 100 (Notable)
Macucos	Brazil	Record daily precipitation	39.0 mm (1.5 in)	42 of 100 (Notable)
Gorodovikovsk	Russia	Record daily precipitation	33.9 mm (1.3 in)	42 of 100 (Notable)
Russell Springs	United States	Record daily precipitation	56.4 mm (2.2 in)	42 of 100 (Notable)
Hahndorf	Australia	Record daily precipitation	29.7 mm (1.2 in)	41 of 100 (Notable)
Violet Town	Australia	Record daily precipitation	28.4 mm (1.1 in)	41 of 100 (Notable)
Mount Buffalo Chalet	Australia	Record daily precipitation	92.4 mm (3.6 in)	41 of 100 (Notable)
Guaimbe	Brazil	Record daily precipitation	33.0 mm (1.3 in)	41 of 100 (Notable)
Bastos	Brazil	Record daily precipitation	38.9 mm (1.5 in)	41 of 100 (Notable)
Salina Muni AP	United States	Record daily precipitation	81.5 mm (3.2 in)	41 of 100 (Notable)
Finley Post Office	Australia	Record daily precipitation	25.0 mm (1.0 in)	40 of 100 (Notable)
Harrietville	Australia	Record daily precipitation	63.0 mm (2.5 in)	40 of 100 (Notable)
Genoa 2 W	United States	Record daily precipitation	38.6 mm (1.5 in)	40 of 100 (Notable)
Tawonga	Australia	Record daily precipitation	47.0 mm (1.9 in)	39 of 100 (Notable)
Tupa	Brazil	Record daily precipitation	28.9 mm (1.1 in)	39 of 100 (Notable)
Concordia ASOS	United States	Record daily precipitation	36.6 mm (1.4 in)	39 of 100 (Notable)
Springhurst	Australia	Record daily precipitation	30.2 mm (1.2 in)	38 of 100 (Notable)
Chapman	United States	Record daily precipitation	82.6 mm (3.3 in)	38 of 100 (Notable)

Counts by Type and Timescale

975 records

Records set or tied on 21 August 1984 by type: Highest daily maximum 86, Lowest daily maximum 56, Highest daily minimum 112, Lowest daily minimum 131, Heaviest daily rainfall 590.

Records on 21 August 1984 by type
Record type	Records
Highest daily maximum	86
Lowest daily maximum	56
Highest daily minimum	112
Lowest daily minimum	131
Heaviest daily rainfall	590
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 1984 by timescale: all-time 1, monthly 25, daily 949.

How Much Records Were Beaten By

844 broken records

Margins by which the 844 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 63.7. Ties are not counted.

Top 20 by Significance

21 August 1984

Top 20 records on 21 August 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1984	Deal Island, AU	daily rain	26.0 mm (1.0 in)	15.8 mm (0.6 in)	74 years	62 of 100 (Major)
21 August 1984	Iacri, BR	monthly rain	72.5 mm (2.9 in)	34.7 mm (1.4 in)	28 years	61 of 100 (Major)
21 August 1984	Ellery Lake, US	daily rain	38.6 mm (1.5 in)	29.7 mm (1.2 in)	45 years	59 of 100 (Notable)
21 August 1984	Cafelandia, BR	daily rain	36.2 mm (1.4 in)	36.2 mm (1.4 in)	47 years	58 of 100 (Notable)
21 August 1984	Rinopolis, BR	monthly rain	73.9 mm (2.9 in)	32.7 mm (1.3 in)	20 years	58 of 100 (Notable)
21 August 1984	Atkinson 3SW, US	daily rain	57.2 mm (2.3 in)	34.3 mm (1.4 in)	68 years	58 of 100 (Notable)
21 August 1984	Chiltern (Post Office), AU	daily rain	39.0 mm (1.5 in)	17.2 mm (0.7 in)	66 years	56 of 100 (Notable)
21 August 1984	Wilsons Promontory Lighthouse, AU	daily rain	42.8 mm (1.7 in)	11.6 mm (0.5 in)	103 years	56 of 100 (Notable)
21 August 1984	Promissao, BR	daily rain	40.5 mm (1.6 in)	40.5 mm (1.6 in)	40 years	56 of 100 (Notable)
21 August 1984	Altair, BR	daily rain	36.7 mm (1.4 in)	36.7 mm (1.4 in)	41 years	55 of 100 (Notable)
21 August 1984	Dandongadale (Mountain View), AU	daily rain	67.6 mm (2.7 in)	32.0 mm (1.3 in)	66 years	54 of 100 (Notable)
21 August 1984	Beechworth Composite, AU	daily rain	48.0 mm (1.9 in)	20.1 mm (0.8 in)	66 years	53 of 100 (Notable)
21 August 1984	Elmore, AU	daily rain	29.6 mm (1.2 in)	15.9 mm (0.6 in)	45 years	52 of 100 (Notable)
21 August 1984	Fazenda Bom Retiro, BR	monthly rain	70.0 mm (2.8 in)	29.7 mm (1.2 in)	28 years	52 of 100 (Notable)
21 August 1984	Eurobin, AU	daily rain	58.0 mm (2.3 in)	22.4 mm (0.9 in)	71 years	51 of 100 (Notable)
21 August 1984	Usina Avanhandava (Cpfl), BR	daily rain	37.7 mm (1.5 in)	36.4 mm (1.4 in)	20 years	51 of 100 (Notable)
21 August 1984	Grand Lake 1 NW, US	daily rain	39.9 mm (1.6 in)	27.2 mm (1.1 in)	15 years	51 of 100 (Notable)
21 August 1984	Abilene, US	daily rain	94.0 mm (3.7 in)	34.1 mm (1.3 in)	72 years	51 of 100 (Notable)
21 August 1984	Corowa Airport, AU	daily rain	31.0 mm (1.2 in)	9.4 mm (0.37 in)	83 years	50 of 100 (Notable)
21 August 1984	Nagambie (Goulburn Weir), AU	daily rain	29.0 mm (1.1 in)	14.8 mm (0.6 in)	66 years	50 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 1984

Records set or tied on this calendar date in each year from 1800 to 1984. 1984 had 975 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 1984-08-21: 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 10	623
10 to 20	139
20 to 30	48
30 to 40	23
40 to 50	9
50 to 60	1
60 to 70	1