Weather Records on 27 September 1977

852 weather records were set or tied worldwide on 27 September 1977. Highest significance: Boqueirao, BR.

Key Facts for 27 September 1977

On 27 September 1977, 852 weather records were set or tied at long-record stations worldwide.
366 were record highs and 150 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 64 monthly and 787 daily.
Boqueirao set an all-time record daily precipitation of 213.8 mm (8.4 in) on 27 September 1977.
Across 154 earlier years (1799 to 2026) the same calendar date averaged 448 records.

Record Map

852 stations

852 station records on 27 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 27 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Boqueirao	Brazil	Record daily precipitation	213.8 mm (8.4 in)	66 of 100 (Major)
Oorsprong-Oos	South Africa	Record daily precipitation	47.0 mm (1.9 in)	62 of 100 (Major)
Groblersplaas	South Africa	Record daily precipitation	60.5 mm (2.4 in)	61 of 100 (Major)
Bontfontein	South Africa	Record daily precipitation	39.0 mm (1.5 in)	61 of 100 (Major)
Palmaryville	South Africa	Record daily precipitation	52.0 mm (2.0 in)	60 of 100 (Major)
Santa Rita de Cassia	Brazil	Record daily precipitation	124.4 mm (4.9 in)	57 of 100 (Notable)
Chorrocho	Brazil	Record daily precipitation	50.0 mm (2.0 in)	56 of 100 (Notable)
Jacobina	Brazil	Record daily precipitation	32.0 mm (1.3 in)	54 of 100 (Notable)
Jacobina	Brazil	Record daily precipitation	50.2 mm (2.0 in)	53 of 100 (Notable)
Porto	Brazil	Record daily precipitation	53.0 mm (2.1 in)	53 of 100 (Notable)
Fayette	United States	Record daily precipitation	89.9 mm (3.5 in)	53 of 100 (Notable)
Ibitiara (Bom Sucesso)	Brazil	Record daily precipitation	35.0 mm (1.4 in)	50 of 100 (Notable)
Salgadalia	Brazil	Record daily precipitation	25.6 mm (1.0 in)	49 of 100 (Notable)
Zoetveld	South Africa	Record daily precipitation	44.5 mm (1.8 in)	49 of 100 (Notable)
Bonito (Ibiapora)	Brazil	Record daily precipitation	52.6 mm (2.1 in)	48 of 100 (Notable)
Driefontein	South Africa	Record daily precipitation	41.0 mm (1.6 in)	47 of 100 (Notable)
Andarai	Brazil	Record daily precipitation	50.2 mm (2.0 in)	46 of 100 (Notable)
Banderlierkop (Pol)	South Africa	Record daily precipitation	38.0 mm (1.5 in)	45 of 100 (Notable)
Cordes	United States	Record daily precipitation	40.1 mm (1.6 in)	45 of 100 (Notable)
Formosa Do Rio Preto (Pcd)	Brazil	Record daily precipitation	44.4 mm (1.7 in)	44 of 100 (Notable)
Barisaho	Georgia	Record daily precipitation	59.2 mm (2.3 in)	44 of 100 (Notable)
Vaalbank	South Africa	Record daily precipitation	49.5 mm (1.9 in)	43 of 100 (Notable)
Mac Mac Bos	South Africa	Record daily precipitation	51.2 mm (2.0 in)	43 of 100 (Notable)
Milner	South Africa	Record daily precipitation	30.3 mm (1.2 in)	42 of 100 (Notable)
Schoongezicht	South Africa	Record daily precipitation	63.0 mm (2.5 in)	42 of 100 (Notable)
Nebo	South Africa	Record daily precipitation	25.5 mm (1.0 in)	42 of 100 (Notable)
Kislovodsk	Russia	Record daily precipitation	26.0 mm (1.0 in)	40 of 100 (Notable)
Bochum	South Africa	Record daily precipitation	29.0 mm (1.1 in)	40 of 100 (Notable)
Pinetop 2E	United States	Record daily precipitation	35.6 mm (1.4 in)	39 of 100 (Notable)
Livermore	United States	Record high minimum temperature	18.9 C (66.0 F)	39 of 100 (Notable)
Cheyenne Wells 2NE	United States	Record high minimum temperature	18.3 C (64.9 F)	39 of 100 (Notable)
Dzaore	Russia	Record daily precipitation	39.8 mm (1.6 in)	38 of 100 (Notable)
Timovskoe	Russia	Record daily precipitation	41.1 mm (1.6 in)	38 of 100 (Notable)
Turffontein	South Africa	Record daily precipitation	62.0 mm (2.4 in)	38 of 100 (Notable)
Eastport	United States	Record daily precipitation	39.6 mm (1.6 in)	38 of 100 (Notable)
Elk	United States	Record high minimum temperature	12.8 C (55.0 F)	37 of 100 (Notable)
Ibiquera	Brazil	Record daily precipitation	30.4 mm (1.2 in)	36 of 100 (Notable)
Boa Vista Do Tupim	Brazil	Record daily precipitation	43.2 mm (1.7 in)	36 of 100 (Notable)
Guadalajara (Dge)	Mexico	Record high minimum temperature	20.0 C (68.0 F)	36 of 100 (Notable)
Vladikavkaz	Russia	Record low maximum temperature	6.0 C (42.8 F)	36 of 100 (Notable)
Inyoko	South Africa	Record daily precipitation	66.5 mm (2.6 in)	36 of 100 (Notable)
Versamelhoek	South Africa	Record daily precipitation	50.5 mm (2.0 in)	36 of 100 (Notable)
Maasbult	South Africa	Record daily precipitation	36.5 mm (1.4 in)	36 of 100 (Notable)
Uman	Ukraine	Record low minimum temperature	-2.3 C (27.9 F)	36 of 100 (Notable)
Harrington Harbour	Canada	Record daily precipitation	45.8 mm (1.8 in)	35 of 100 (Notable)
Velikie Luki	Russia	Record low minimum temperature	-6.1 C (21.0 F)	35 of 100 (Notable)
Pilanesberg-Pol	South Africa	Record daily precipitation	43.5 mm (1.7 in)	35 of 100 (Notable)
Pilgrims Rest (Pol)	South Africa	Record daily precipitation	32.2 mm (1.3 in)	35 of 100 (Notable)
Orono	United States	Record daily precipitation	62.2 mm (2.4 in)	35 of 100 (Notable)
Van Buren 1 NE	United States	Record daily precipitation	58.4 mm (2.3 in)	35 of 100 (Notable)
Cape May 2 NW	United States	Record high maximum temperature	27.8 C (82.0 F)	35 of 100 (Notable)
Tahlequah	United States	Record high minimum temperature	23.9 C (75.0 F)	35 of 100 (Notable)
Georgetown	United States	Record high maximum temperature	38.9 C (102.0 F)	35 of 100 (Notable)
Vasilevici	Belarus	Record low minimum temperature	-3.9 C (25.0 F)	34 of 100 (Routine)
Atlatlahuacan	Mexico	Record high minimum temperature	17.8 C (64.0 F)	34 of 100 (Routine)
Potchefstroom Agr.	South Africa	Record daily precipitation	35.0 mm (1.4 in)	34 of 100 (Routine)
Mimosa Park	South Africa	Record daily precipitation	36.0 mm (1.4 in)	34 of 100 (Routine)
New Iberia AP - Acadiana Rgnl	United States	Record high minimum temperature	23.9 C (75.0 F)	34 of 100 (Routine)
Grapevine Dam	United States	Record high minimum temperature	25.0 C (77.0 F)	34 of 100 (Routine)
Mochudi	Botswana	Record daily precipitation	25.0 mm (1.0 in)	33 of 100 (Routine)

Counts by Type and Timescale

852 records

Records set or tied on 27 September 1977 by type: Highest daily maximum 135, Lowest daily maximum 86, Highest daily minimum 231, Lowest daily minimum 64, Heaviest daily rainfall 335, Heaviest daily snowfall 1.

Records on 27 September 1977 by type
Record type	Records
Highest daily maximum	135
Lowest daily maximum	86
Highest daily minimum	231
Lowest daily minimum	64
Heaviest daily rainfall	335
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 27 September 1977 by timescale: all-time 1, monthly 64, daily 787.

How Much Records Were Beaten By

694 broken records

Margins by which the 694 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 89.0. Ties are not counted.

Top 20 by Significance

27 September 1977

Top 20 records on 27 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 September 1977	Boqueirao, BR	all-time rain	213.8 mm (8.4 in)	72.0 mm (2.8 in)	6 years	66 of 100 (Major)
27 September 1977	Oorsprong-Oos, ZA	daily rain	47.0 mm (1.9 in)	29.0 mm (1.1 in)	56 years	62 of 100 (Major)
27 September 1977	Groblersplaas, ZA	daily rain	60.5 mm (2.4 in)	55.2 mm (2.2 in)	51 years	61 of 100 (Major)
27 September 1977	Bontfontein, ZA	daily rain	39.0 mm (1.5 in)	39.0 mm (1.5 in)	54 years	61 of 100 (Major)
27 September 1977	Palmaryville, ZA	daily rain	52.0 mm (2.0 in)	41.1 mm (1.6 in)	52 years	60 of 100 (Major)
27 September 1977	Santa Rita de Cassia, BR	monthly rain	124.4 mm (4.9 in)	59.2 mm (2.3 in)	8 years	57 of 100 (Notable)
27 September 1977	Chorrocho, BR	daily rain	50.0 mm (2.0 in)	50.0 mm (2.0 in)	40 years	56 of 100 (Notable)
27 September 1977	Jacobina, BR	daily rain	32.0 mm (1.3 in)	16.8 mm (0.7 in)	54 years	54 of 100 (Notable)
27 September 1977	Jacobina, BR	monthly rain	50.2 mm (2.0 in)	22.0 mm (0.9 in)	0 years	53 of 100 (Notable)
27 September 1977	Porto, BR	monthly rain	53.0 mm (2.1 in)	22.2 mm (0.9 in)	0 years	53 of 100 (Notable)
27 September 1977	Fayette, US	daily rain	89.9 mm (3.5 in)	48.5 mm (1.9 in)	52 years	53 of 100 (Notable)
27 September 1977	Ibitiara (Bom Sucesso), BR	daily rain	35.0 mm (1.4 in)	35.0 mm (1.4 in)	39 years	50 of 100 (Notable)
27 September 1977	Salgadalia, BR	daily rain	25.6 mm (1.0 in)	22.1 mm (0.9 in)	16 years	49 of 100 (Notable)
27 September 1977	Zoetveld, ZA	daily rain	44.5 mm (1.8 in)	30.3 mm (1.2 in)	52 years	49 of 100 (Notable)
27 September 1977	Bonito (Ibiapora), BR	monthly rain	52.6 mm (2.1 in)	19.1 mm (0.8 in)	4 years	48 of 100 (Notable)
27 September 1977	Driefontein, ZA	daily rain	41.0 mm (1.6 in)	20.7 mm (0.8 in)	56 years	47 of 100 (Notable)
27 September 1977	Andarai, BR	daily rain	50.2 mm (2.0 in)	38.4 mm (1.5 in)	10 years	46 of 100 (Notable)
27 September 1977	Banderlierkop (Pol), ZA	monthly rain	38.0 mm (1.5 in)	6.0 mm (0.24 in)	71 years	45 of 100 (Notable)
27 September 1977	Cordes, US	daily rain	40.1 mm (1.6 in)	35.0 mm (1.4 in)	42 years	45 of 100 (Notable)
27 September 1977	Formosa Do Rio Preto (Pcd), BR	daily rain	44.4 mm (1.7 in)	36.4 mm (1.4 in)	32 years	44 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

1799 to 1977

Records set or tied on this calendar date in each year from 1799 to 1977. 1977 had 852 records.

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

Records on 09-27 in each year
Year	Records
1799	1
1828	1
1836	2
1847	1
1851	1
1854	2
1855	2
1859	2
1866	2
1867	3
1874	1
1875	1
1877	2
1880	1
1881	4
1882	1
1885	5
1887	1
1890	3
1891	1
1892	1
1893	1
1894	5
1895	6
1896	1
1897	2
1898	4
1899	1
1900	5
1901	3
1902	12
1903	7
1904	12
1905	21
1906	21
1907	9
1908	36
1909	17
1910	20
1911	31
1912	25
1913	27
1914	24
1915	80
1916	57
1917	41
1918	58
1919	45
1920	54
1921	26
1922	111
1923	125
1924	115
1925	129
1926	581
1927	244
1928	288
1929	225
1930	178
1931	222
1932	194
1933	559
1934	298
1935	319
1936	435
1937	309
1938	366
1939	572
1940	706
1941	257
1942	1,353
1943	503
1944	323
1945	475
1946	387
1947	813
1948	405
1949	407
1950	223
1951	480
1952	539
1953	567
1954	507
1955	386
1956	825
1957	644
1958	585
1959	582
1960	337
1961	376
1962	352
1963	849
1964	724
1965	688
1966	426
1967	502
1968	286
1969	233
1970	773
1971	762
1972	989
1973	1,031
1974	408
1975	790
1976	905
1977	852
1978	773
1979	741
1980	559
1981	680
1982	1,076
1983	791
1984	1,297
1985	661
1986	1,772
1987	1,013
1988	494
1989	852
1990	379
1991	894
1992	659
1993	727
1994	764
1995	698
1996	1,468
1997	730
1998	1,774
1999	1,059
2000	1,031
2001	980
2002	992
2003	830
2004	665
2005	1,061
2006	596
2007	1,091
2008	659
2009	987
2010	1,153
2011	965
2012	624
2013	823
2014	813
2015	664
2016	600
2017	891
2018	600
2019	755
2020	659
2021	893
2022	642
2023	747
2024	1,449
2025	272
2026	358

Download the Data

Data for records on 1977-09-27: 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 20	647
20 to 40	38
40 to 60	7
60 to 80	1
80 to 100	1