Weather Records on 21 September 1984

707 weather records were set or tied worldwide on 21 September 1984. Highest significance: Blackburn, ZA.

Key Facts for 21 September 1984

On 21 September 1984, 707 weather records were set or tied at long-record stations worldwide.
131 were record highs and 159 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 11 monthly and 696 daily.
Blackburn set a daily record precipitation of 77.0 mm (3.0 in) on 21 September 1984.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 449 records.

Record Map

707 stations

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

Weather records on 21 September 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Blackburn	South Africa	Record daily precipitation	77.0 mm (3.0 in)	52 of 100 (Notable)
Tabou	Cote D'Ivoire	Record daily precipitation	113.0 mm (4.4 in)	47 of 100 (Notable)
Ogden Pioneer Ph	United States	Record daily precipitation	34.5 mm (1.4 in)	47 of 100 (Notable)
Gospic	Croatia	Record daily precipitation	71.0 mm (2.8 in)	46 of 100 (Notable)
Atlatlahuacan	Mexico	Record daily precipitation	75.9 mm (3.0 in)	46 of 100 (Notable)
Pirapitingui	Brazil	Record daily precipitation	49.5 mm (1.9 in)	45 of 100 (Notable)
Sete Barras	Brazil	Record daily precipitation	70.9 mm (2.8 in)	44 of 100 (Notable)
Guaianas	Brazil	Record daily precipitation	48.7 mm (1.9 in)	43 of 100 (Notable)
Tenerife/Los Rodeos	Spain	Record daily precipitation	33.5 mm (1.3 in)	42 of 100 (Notable)
Abre Campo	Brazil	Record daily precipitation	50.4 mm (2.0 in)	41 of 100 (Notable)
McCall	United States	Record daily precipitation	32.0 mm (1.3 in)	41 of 100 (Notable)
Dutch Harbor	United States	Record daily precipitation	50.3 mm (2.0 in)	41 of 100 (Notable)
Casa Grande	Brazil	Record daily precipitation	49.3 mm (1.9 in)	39 of 100 (Notable)
Porto Santa Terezinha An/Cesp	Brazil	Record daily precipitation	49.0 mm (1.9 in)	39 of 100 (Notable)
Nazare Paulista	Brazil	Record daily precipitation	46.3 mm (1.8 in)	39 of 100 (Notable)
Reit Im Winkl	Germany	Record daily precipitation	61.9 mm (2.4 in)	39 of 100 (Notable)
Westbury (Valley View)	Australia	Record daily precipitation	32.8 mm (1.3 in)	38 of 100 (Notable)
Vila Prosperidade (Gm)	Brazil	Record daily precipitation	53.9 mm (2.1 in)	38 of 100 (Notable)
Bozeman 12 NE	United States	Record daily precipitation	49.5 mm (1.9 in)	38 of 100 (Notable)
Leola	United States	Record high maximum temperature	33.3 C (91.9 F)	38 of 100 (Notable)
Sodrelia	Brazil	Record daily precipitation	57.6 mm (2.3 in)	37 of 100 (Notable)
Ponta da Praia	Brazil	Record daily precipitation	59.4 mm (2.3 in)	37 of 100 (Notable)
Midland	United States	Record high maximum temperature	34.4 C (93.9 F)	37 of 100 (Notable)
Carrick (Oaks Road)	Australia	Record daily precipitation	32.0 mm (1.3 in)	36 of 100 (Notable)
Ulverstone (Knights Road)	Australia	Record daily precipitation	40.6 mm (1.6 in)	36 of 100 (Notable)
Sumidouro-Usina Sao Jorge	Brazil	Record daily precipitation	104.0 mm (4.1 in)	36 of 100 (Notable)
Sarapui	Brazil	Record daily precipitation	41.3 mm (1.6 in)	36 of 100 (Notable)
Hostotipaquillo	Mexico	Record low minimum temperature	7.8 C (46.0 F)	36 of 100 (Notable)
Cordele	United States	Record low minimum temperature	9.4 C (48.9 F)	36 of 100 (Notable)
Fargo Hector Intl AP	United States	Record high maximum temperature	31.1 C (88.0 F)	36 of 100 (Notable)
Cressy House	Australia	Record daily precipitation	32.4 mm (1.3 in)	35 of 100 (Notable)
Salesopolis	Brazil	Record daily precipitation	44.4 mm (1.7 in)	35 of 100 (Notable)
Servico Social de Menores	Brazil	Record daily precipitation	45.7 mm (1.8 in)	35 of 100 (Notable)
Fitzgerald	United States	Record low minimum temperature	10.0 C (50.0 F)	35 of 100 (Notable)
Laghouat	Algeria	Record low minimum temperature	8.7 C (47.7 F)	34 of 100 (Routine)
Deloraine (Athol)	Australia	Record daily precipitation	34.2 mm (1.3 in)	34 of 100 (Routine)
Bairro Do Sarapu	Brazil	Record daily precipitation	38.5 mm (1.5 in)	34 of 100 (Routine)
Camden 3 W	United States	Record low minimum temperature	6.1 C (43.0 F)	34 of 100 (Routine)
Ourinhos	Brazil	Record daily precipitation	46.8 mm (1.8 in)	33 of 100 (Routine)
Itapetininga	Brazil	Record daily precipitation	45.2 mm (1.8 in)	33 of 100 (Routine)
Ciudad Lerdo (Dge)	Mexico	Record low minimum temperature	11.7 C (53.1 F)	33 of 100 (Routine)
Fajardo	Puerto Rico [United States]	Record daily precipitation	87.4 mm (3.4 in)	33 of 100 (Routine)
Frankford (Rossville)	Australia	Record daily precipitation	33.0 mm (1.3 in)	32 of 100 (Routine)
Sao Bento Do Sapucai	Brazil	Record daily precipitation	42.8 mm (1.7 in)	32 of 100 (Routine)
Tejupa	Brazil	Record daily precipitation	34.4 mm (1.4 in)	32 of 100 (Routine)
Fazenda Sao Luiz	Brazil	Record daily precipitation	44.0 mm (1.7 in)	32 of 100 (Routine)
Elk City 1NE	United States	Record daily precipitation	26.7 mm (1.1 in)	32 of 100 (Routine)
Grand Cane Fire Twr	United States	Record daily precipitation	32.5 mm (1.3 in)	32 of 100 (Routine)
Milesville 5 NE	United States	Record high maximum temperature	33.9 C (93.0 F)	32 of 100 (Routine)
Liffey	Australia	Record daily precipitation	48.0 mm (1.9 in)	31 of 100 (Routine)
Fartura	Brazil	Record daily precipitation	43.4 mm (1.7 in)	31 of 100 (Routine)
Agua Branca	Brazil	Record daily precipitation	48.2 mm (1.9 in)	30 of 100 (Routine)
Luz (Estacao)	Brazil	Record daily precipitation	40.4 mm (1.6 in)	30 of 100 (Routine)
Maua	Brazil	Record daily precipitation	44.6 mm (1.8 in)	30 of 100 (Routine)
Ferreira Das Almas	Brazil	Record daily precipitation	51.9 mm (2.0 in)	30 of 100 (Routine)
Buri	Brazil	Record daily precipitation	46.0 mm (1.8 in)	30 of 100 (Routine)
Nacozari (Smn)	Mexico	Record daily precipitation	43.2 mm (1.7 in)	30 of 100 (Routine)
Sahuaripa	Mexico	Record daily precipitation	27.9 mm (1.1 in)	30 of 100 (Routine)
Avon Park 2 W	United States	Record low maximum temperature	26.7 C (80.1 F)	30 of 100 (Routine)
Eastman 1 W	United States	Record low minimum temperature	10.0 C (50.0 F)	30 of 100 (Routine)

Counts by Type and Timescale

707 records

Records set or tied on 21 September 1984 by type: Highest daily maximum 78, Lowest daily maximum 46, Highest daily minimum 53, Lowest daily minimum 113, Heaviest daily rainfall 415, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 21 September 1984 by type
Record type	Records
Highest daily maximum	78
Lowest daily maximum	46
Highest daily minimum	53
Lowest daily minimum	113
Heaviest daily rainfall	415
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 21 September 1984 by timescale: all-time 0, monthly 11, daily 696.

How Much Records Were Beaten By

611 broken records

Margins by which the 611 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 79.6. Ties are not counted.

Top 20 by Significance

21 September 1984

Top 20 records on 21 September 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1984	Blackburn, ZA	daily rain	77.0 mm (3.0 in)	56.0 mm (2.2 in)	24 years	52 of 100 (Notable)
21 September 1984	Tabou, CI	daily rain	113.0 mm (4.4 in)	79.6 mm (3.1 in)	13 years	47 of 100 (Notable)
21 September 1984	Ogden Pioneer Ph, US	daily rain	34.5 mm (1.4 in)	29.4 mm (1.2 in)	25 years	47 of 100 (Notable)
21 September 1984	Gospic, HR	daily rain	71.0 mm (2.8 in)	34.2 mm (1.3 in)	59 years	46 of 100 (Notable)
21 September 1984	Atlatlahuacan, MX	daily rain	75.9 mm (3.0 in)	31.4 mm (1.2 in)	56 years	46 of 100 (Notable)
21 September 1984	Pirapitingui, BR	daily rain	49.5 mm (1.9 in)	33.9 mm (1.3 in)	27 years	45 of 100 (Notable)
21 September 1984	Sete Barras, BR	daily rain	70.9 mm (2.8 in)	42.3 mm (1.7 in)	4 years	44 of 100 (Notable)
21 September 1984	Guaianas, BR	daily rain	48.7 mm (1.9 in)	37.6 mm (1.5 in)	15 years	43 of 100 (Notable)
21 September 1984	Tenerife/Los Rodeos, ES	daily rain	33.5 mm (1.3 in)	19.6 mm (0.8 in)	34 years	42 of 100 (Notable)
21 September 1984	Abre Campo, BR	daily rain	50.4 mm (2.0 in)	30.0 mm (1.2 in)	32 years	41 of 100 (Notable)
21 September 1984	McCall, US	daily rain	32.0 mm (1.3 in)	18.0 mm (0.7 in)	15 years	41 of 100 (Notable)
21 September 1984	Dutch Harbor, US	daily rain	50.3 mm (2.0 in)	19.6 mm (0.8 in)	44 years	41 of 100 (Notable)
21 September 1984	Casa Grande, BR	daily rain	49.3 mm (1.9 in)	28.7 mm (1.1 in)	18 years	39 of 100 (Notable)
21 September 1984	Porto Santa Terezinha An/Cesp, BR	daily rain	49.0 mm (1.9 in)	41.0 mm (1.6 in)	14 years	39 of 100 (Notable)
21 September 1984	Nazare Paulista, BR	daily rain	46.3 mm (1.8 in)	34.7 mm (1.4 in)	22 years	39 of 100 (Notable)
21 September 1984	Reit Im Winkl, DE	daily rain	61.9 mm (2.4 in)	33.0 mm (1.3 in)	5 years	39 of 100 (Notable)
21 September 1984	Westbury (Valley View), AU	daily rain	32.8 mm (1.3 in)	18.6 mm (0.7 in)	18 years	38 of 100 (Notable)
21 September 1984	Vila Prosperidade (Gm), BR	daily rain	53.9 mm (2.1 in)	31.5 mm (1.2 in)	4 years	38 of 100 (Notable)
21 September 1984	Bozeman 12 NE, US	daily rain	49.5 mm (1.9 in)	26.1 mm (1.0 in)	25 years	38 of 100 (Notable)
21 September 1984	Leola, US	daily high max	33.3 C (91.9 F)	4.4 C (7.9 F)	79 years	38 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

1805 to 1984

Records set or tied on this calendar date in each year from 1805 to 1984. 1984 had 707 records.

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

Records on 09-21 in each year
Year	Records
1805	1
1812	1
1825	2
1840	1
1841	1
1842	1
1848	1
1854	1
1856	2
1868	1
1872	2
1873	1
1877	1
1878	1
1881	1
1882	1
1884	1
1886	1
1888	2
1889	1
1891	10
1892	1
1893	10
1894	2
1895	3
1896	2
1897	6
1898	6
1899	3
1900	2
1901	5
1902	5
1903	8
1904	20
1905	12
1906	17
1907	10
1908	17
1909	10
1910	8
1911	18
1912	26
1913	37
1914	29
1915	34
1916	48
1917	28
1918	43
1919	54
1920	29
1921	64
1922	35
1923	232
1924	291
1925	278
1926	178
1927	165
1928	81
1929	232
1930	82
1931	681
1932	242
1933	193
1934	492
1935	199
1936	329
1937	487
1938	508
1939	308
1940	908
1941	416
1942	291
1943	407
1944	413
1945	507
1946	176
1947	534
1948	301
1949	298
1950	334
1951	241
1952	430
1953	382
1954	453
1955	752
1956	1,100
1957	366
1958	588
1959	513
1960	418
1961	441
1962	1,085
1963	306
1964	374
1965	1,088
1966	565
1967	577
1968	790
1969	593
1970	708
1971	645
1972	599
1973	421
1974	652
1975	528
1976	694
1977	918
1978	818
1979	736
1980	990
1981	696
1982	1,484
1983	2,207
1984	707
1985	796
1986	671
1987	965
1988	557
1989	1,002
1990	716
1991	1,021
1992	752
1993	911
1994	713
1995	2,002
1996	1,233
1997	1,112
1998	1,481
1999	1,025
2000	884
2001	718
2002	696
2003	959
2004	888
2005	1,143
2006	920
2007	742
2008	740
2009	715
2010	1,290
2011	542
2012	595
2013	769
2014	716
2015	565
2016	989
2017	1,178
2018	1,051
2019	833
2020	580
2021	465
2022	1,049
2023	783
2024	470
2025	591
2026	478

Download the Data

Data for records on 1984-09-21: 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 10	456
10 to 20	104
20 to 30	33
30 to 40	10
40 to 50	6
50 to 60	1
60 to 70	0
70 to 80	1