Weather Records on 20 September 1984

895 weather records were set or tied worldwide on 20 September 1984. Highest significance: Coen Post Office, AU.

Key Facts for 20 September 1984

On 20 September 1984, 895 weather records were set or tied at long-record stations worldwide.
354 were record highs and 202 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 20 monthly and 874 daily.
Coen Post Office set a daily record precipitation of 31.0 mm (1.2 in) on 20 September 1984.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 439 records.

Record Map

895 stations

895 station records on 20 September 1984 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Coen Post Office	Australia	Record daily precipitation	31.0 mm (1.2 in)	77 of 100 (Major)
Koonmarra	Australia	Record daily precipitation	34.0 mm (1.3 in)	63 of 100 (Major)
Apizaco	Mexico	Record daily precipitation	89.9 mm (3.5 in)	63 of 100 (Major)
Eureka	United States	Record daily precipitation	33.0 mm (1.3 in)	63 of 100 (Major)
Sta. Cruz de Tenerife	Spain	Record daily precipitation	34.4 mm (1.4 in)	54 of 100 (Notable)
Angatuba	Brazil	Record daily precipitation	51.3 mm (2.0 in)	53 of 100 (Notable)
Fazenda Vista Redonda	Brazil	Record daily precipitation	78.0 mm (3.1 in)	53 of 100 (Notable)
Ibiuna	Brazil	Record daily precipitation	63.2 mm (2.5 in)	53 of 100 (Notable)
Salto de Pirapora	Brazil	Record daily precipitation	50.4 mm (2.0 in)	52 of 100 (Notable)
Tapirai	Brazil	Record daily precipitation	52.4 mm (2.1 in)	51 of 100 (Notable)
Warren	United States	Record high minimum temperature	8.9 C (48.0 F)	51 of 100 (Notable)
Usina Turvinho	Brazil	Record daily precipitation	42.3 mm (1.7 in)	50 of 100 (Notable)
Monte Belo	Brazil	Record daily precipitation	46.7 mm (1.8 in)	49 of 100 (Notable)
Fazenda Aterradinho	Brazil	Record daily precipitation	53.7 mm (2.1 in)	49 of 100 (Notable)
Servico Social de Menores	Brazil	Record daily precipitation	61.8 mm (2.4 in)	49 of 100 (Notable)
Barmedman Post Office	Australia	Record daily precipitation	61.0 mm (2.4 in)	48 of 100 (Notable)
Eden (Pirajibu)	Brazil	Record daily precipitation	44.3 mm (1.7 in)	48 of 100 (Notable)
Bairro Do Sarapu	Brazil	Record daily precipitation	61.8 mm (2.4 in)	48 of 100 (Notable)
Juquia	Brazil	Record daily precipitation	56.5 mm (2.2 in)	48 of 100 (Notable)
Pedro Beicht	Brazil	Record daily precipitation	69.1 mm (2.7 in)	48 of 100 (Notable)
Cerqueira Cesar	Brazil	Record daily precipitation	50.0 mm (2.0 in)	48 of 100 (Notable)
Recalque Abc	Brazil	Record daily precipitation	47.2 mm (1.9 in)	47 of 100 (Notable)
Juquitiba	Brazil	Record daily precipitation	52.0 mm (2.0 in)	46 of 100 (Notable)
Perus	Brazil	Record daily precipitation	56.4 mm (2.2 in)	45 of 100 (Notable)
Eldorado	Brazil	Record daily precipitation	55.9 mm (2.2 in)	45 of 100 (Notable)
Presa Mixcoac	Mexico	Record daily precipitation	54.1 mm (2.1 in)	44 of 100 (Notable)
Miracatu	Brazil	Record daily precipitation	42.0 mm (1.7 in)	43 of 100 (Notable)
Franco da Rocha (Hosp.Juqueri)	Brazil	Record daily precipitation	45.0 mm (1.8 in)	43 of 100 (Notable)
Itapetininga	Brazil	Record daily precipitation	50.7 mm (2.0 in)	43 of 100 (Notable)
Monte Carmelo	Brazil	Record daily precipitation	28.6 mm (1.1 in)	42 of 100 (Notable)
Biritiba Mirim	Brazil	Record daily precipitation	32.7 mm (1.3 in)	42 of 100 (Notable)
Itaquaquecetuba	Brazil	Record daily precipitation	43.0 mm (1.7 in)	42 of 100 (Notable)
Sao Miguel Arcanjo	Brazil	Record daily precipitation	42.2 mm (1.7 in)	42 of 100 (Notable)
Cesario Lange	Brazil	Record daily precipitation	38.4 mm (1.5 in)	42 of 100 (Notable)
Campina Do Monte Alegre An/Ces	Brazil	Record daily precipitation	49.4 mm (1.9 in)	41 of 100 (Notable)
Apizaco	Mexico	Record high maximum temperature	30.0 C (86.0 F)	41 of 100 (Notable)
Ponce 4 E	Puerto Rico [United States]	Record daily precipitation	70.1 mm (2.8 in)	41 of 100 (Notable)
Ndola	Zambia	Record daily precipitation	25.9 mm (1.0 in)	41 of 100 (Notable)
Sarapui	Brazil	Record daily precipitation	57.1 mm (2.2 in)	40 of 100 (Notable)
Presa Ansaldo	Mexico	Record daily precipitation	57.4 mm (2.3 in)	40 of 100 (Notable)
American Falls 6 NE	United States	Record high minimum temperature	16.1 C (61.0 F)	40 of 100 (Notable)
Riverside 7 SSW	United States	Record high minimum temperature	15.0 C (59.0 F)	40 of 100 (Notable)
Cape Grim (Woolnorth)	Australia	Record daily precipitation	33.8 mm (1.3 in)	39 of 100 (Notable)
Bairro Represa	Brazil	Record daily precipitation	39.7 mm (1.6 in)	39 of 100 (Notable)
Pariquera-Acu	Brazil	Record daily precipitation	49.4 mm (1.9 in)	39 of 100 (Notable)
Avare	Brazil	Record daily precipitation	42.7 mm (1.7 in)	38 of 100 (Notable)
Angatuba	Brazil	Record daily precipitation	41.8 mm (1.6 in)	38 of 100 (Notable)
Petropavlovsk-Kamchatskij	Russia	Record high maximum temperature	19.7 C (67.5 F)	38 of 100 (Notable)
Songkhla	Thailand	Record daily precipitation	110.2 mm (4.3 in)	38 of 100 (Notable)
Hutchinson 1 N	United States	Record high maximum temperature	35.0 C (95.0 F)	38 of 100 (Notable)
Hood Rvr Exp STN	United States	Record high minimum temperature	16.1 C (61.0 F)	38 of 100 (Notable)
Nerriga Composite	Australia	Record daily precipitation	29.8 mm (1.2 in)	37 of 100 (Notable)
St. Leonards (Lowfields)	Australia	Record daily precipitation	33.8 mm (1.3 in)	37 of 100 (Notable)
Tenerife/Los Rodeos	Spain	Record daily precipitation	48.7 mm (1.9 in)	37 of 100 (Notable)
Tower 2S	United States	Record high maximum temperature	30.0 C (86.0 F)	37 of 100 (Notable)
Itaiquara	Brazil	Record daily precipitation	45.8 mm (1.8 in)	36 of 100 (Notable)
Fazenda Santo Angelo	Brazil	Record daily precipitation	37.1 mm (1.5 in)	36 of 100 (Notable)
Cachoeira da Graca	Brazil	Record daily precipitation	80.0 mm (3.1 in)	36 of 100 (Notable)
Oakley	United States	Record high minimum temperature	13.3 C (55.9 F)	36 of 100 (Notable)
Sandy Lake Dam Libby	United States	Record high maximum temperature	32.2 C (90.0 F)	36 of 100 (Notable)

Counts by Type and Timescale

895 records

Records set or tied on 20 September 1984 by type: Highest daily maximum 189, Lowest daily maximum 78, Highest daily minimum 165, Lowest daily minimum 124, Heaviest daily rainfall 336, Deepest snow cover 3.

Records on 20 September 1984 by type
Record type	Records
Highest daily maximum	189
Lowest daily maximum	78
Highest daily minimum	165
Lowest daily minimum	124
Heaviest daily rainfall	336
Heaviest daily snowfall	0
Deepest snow cover	3

Records on 20 September 1984 by timescale: all-time 1, monthly 20, daily 874.

How Much Records Were Beaten By

737 broken records

Margins by which the 737 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 74.4. Ties are not counted.

Top 20 by Significance

20 September 1984

Top 20 records on 20 September 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1984	Coen Post Office, AU	daily rain	31.0 mm (1.2 in)	28.0 mm (1.1 in)	93 years	77 of 100 (Major)
20 September 1984	Koonmarra, AU	monthly rain	34.0 mm (1.3 in)	21.0 mm (0.8 in)	28 years	63 of 100 (Major)
20 September 1984	Apizaco, MX	all-time rain	89.9 mm (3.5 in)	19.8 mm (0.8 in)	54 years	63 of 100 (Major)
20 September 1984	Eureka, US	daily rain	33.0 mm (1.3 in)	20.3 mm (0.8 in)	82 years	63 of 100 (Major)
20 September 1984	Sta. Cruz de Tenerife, ES	daily rain	34.4 mm (1.4 in)	31.4 mm (1.2 in)	33 years	54 of 100 (Notable)
20 September 1984	Angatuba, BR	daily rain	51.3 mm (2.0 in)	46.2 mm (1.8 in)	30 years	53 of 100 (Notable)
20 September 1984	Fazenda Vista Redonda, BR	daily rain	78.0 mm (3.1 in)	74.4 mm (2.9 in)	30 years	53 of 100 (Notable)
20 September 1984	Ibiuna, BR	daily rain	63.2 mm (2.5 in)	47.0 mm (1.9 in)	32 years	53 of 100 (Notable)
20 September 1984	Salto de Pirapora, BR	daily rain	50.4 mm (2.0 in)	48.0 mm (1.9 in)	30 years	52 of 100 (Notable)
20 September 1984	Tapirai, BR	daily rain	52.4 mm (2.1 in)	36.9 mm (1.5 in)	30 years	51 of 100 (Notable)
20 September 1984	Warren, US	daily high min	8.9 C (48.0 F)	5.6 C (10.1 F)	87 years	51 of 100 (Notable)
20 September 1984	Usina Turvinho, BR	daily rain	42.3 mm (1.7 in)	32.3 mm (1.3 in)	41 years	50 of 100 (Notable)
20 September 1984	Monte Belo, BR	daily rain	46.7 mm (1.8 in)	39.5 mm (1.6 in)	30 years	49 of 100 (Notable)
20 September 1984	Fazenda Aterradinho, BR	daily rain	53.7 mm (2.1 in)	36.5 mm (1.4 in)	43 years	49 of 100 (Notable)
20 September 1984	Servico Social de Menores, BR	daily rain	61.8 mm (2.4 in)	53.5 mm (2.1 in)	18 years	49 of 100 (Notable)
20 September 1984	Barmedman Post Office, AU	monthly rain	61.0 mm (2.4 in)	4.6 mm (0.18 in)	78 years	48 of 100 (Notable)
20 September 1984	Eden (Pirajibu), BR	daily rain	44.3 mm (1.7 in)	39.8 mm (1.6 in)	30 years	48 of 100 (Notable)
20 September 1984	Bairro Do Sarapu, BR	daily rain	61.8 mm (2.4 in)	48.0 mm (1.9 in)	15 years	48 of 100 (Notable)
20 September 1984	Juquia, BR	daily rain	56.5 mm (2.2 in)	44.8 mm (1.8 in)	15 years	48 of 100 (Notable)
20 September 1984	Pedro Beicht, BR	daily rain	69.1 mm (2.7 in)	56.4 mm (2.2 in)	15 years	48 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

1812 to 1984

Records set or tied on this calendar date in each year from 1812 to 1984. 1984 had 895 records.

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

Records on 09-20 in each year
Year	Records
1812	1
1837	1
1840	1
1844	1
1848	2
1851	1
1852	1
1854	2
1855	1
1856	2
1859	2
1860	1
1862	1
1870	1
1871	2
1882	2
1883	1
1884	1
1886	2
1887	1
1888	2
1889	8
1891	4
1893	5
1894	1
1895	2
1896	1
1897	16
1898	4
1899	1
1900	2
1901	3
1902	3
1903	3
1904	12
1905	8
1906	22
1907	11
1908	24
1909	10
1910	8
1911	21
1912	34
1913	48
1914	28
1915	239
1916	28
1917	100
1918	59
1919	55
1920	64
1921	40
1922	52
1923	249
1924	329
1925	330
1926	129
1927	169
1928	144
1929	373
1930	102
1931	564
1932	270
1933	223
1934	349
1935	201
1936	133
1937	385
1938	506
1939	312
1940	591
1941	582
1942	436
1943	419
1944	466
1945	406
1946	766
1947	460
1948	454
1949	268
1950	435
1951	267
1952	434
1953	479
1954	628
1955	625
1956	985
1957	514
1958	410
1959	489
1960	352
1961	384
1962	707
1963	290
1964	482
1965	1,180
1966	414
1967	449
1968	617
1969	604
1970	591
1971	884
1972	582
1973	569
1974	771
1975	527
1976	375
1977	776
1978	1,216
1979	767
1980	567
1981	979
1982	911
1983	1,958
1984	895
1985	730
1986	743
1987	856
1988	698
1989	968
1990	743
1991	1,835
1992	718
1993	1,031
1994	788
1995	1,374
1996	1,077
1997	1,282
1998	1,157
1999	923
2000	908
2001	821
2002	845
2003	910
2004	1,156
2005	960
2006	732
2007	645
2008	648
2009	715
2010	1,497
2011	650
2012	549
2013	595
2014	577
2015	439
2016	778
2017	920
2018	1,020
2019	835
2020	630
2021	565
2022	786
2023	482
2024	596
2025	877
2026	682

Download the Data

Data for records on 1984-09-20: 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 2026-10-17 (17 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	613
10 to 20	60
20 to 30	26
30 to 40	25
40 to 50	10
50 to 60	2
60 to 70	0
70 to 80	1