Weather Records on 21 September 1977

918 weather records were set or tied worldwide on 21 September 1977. Highest significance: Windham 3 E, US.

Key Facts for 21 September 1977

On 21 September 1977, 918 weather records were set or tied at long-record stations worldwide.
155 were record highs and 351 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 13 monthly and 905 daily.
Windham 3 E set a daily record precipitation of 60.5 mm (2.4 in) on 21 September 1977.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 448 records.

Record Map

918 stations

918 station records on 21 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Windham 3 E	United States	Record daily precipitation	60.5 mm (2.4 in)	65 of 100 (Major)
Tygerfontein	South Africa	Record daily precipitation	103.5 mm (4.1 in)	59 of 100 (Notable)
Rooijantjiesfontein	South Africa	Record daily precipitation	38.0 mm (1.5 in)	59 of 100 (Notable)
Theunissen (Mun)	South Africa	Record daily precipitation	35.0 mm (1.4 in)	55 of 100 (Notable)
Excelsior (Mun)	South Africa	Record daily precipitation	26.5 mm (1.0 in)	53 of 100 (Notable)
Brooks Ahrc	Canada	Record daily precipitation	47.5 mm (1.9 in)	52 of 100 (Notable)
Palmerville	Australia	Record low maximum temperature	28.0 C (82.4 F)	50 of 100 (Notable)
Cape Vasileva	Russia	Record daily precipitation	87.2 mm (3.4 in)	50 of 100 (Notable)
Olivine	South Africa	Record daily precipitation	27.0 mm (1.1 in)	50 of 100 (Notable)
Hertzogville (Pol)	South Africa	Record daily precipitation	41.5 mm (1.6 in)	49 of 100 (Notable)
Edenburg (Pol)	South Africa	Record daily precipitation	31.0 mm (1.2 in)	48 of 100 (Notable)
Kirklington	South Africa	Record daily precipitation	30.6 mm (1.2 in)	48 of 100 (Notable)
Doornpoort	South Africa	Record daily precipitation	30.0 mm (1.2 in)	47 of 100 (Notable)
Nietverdiend (Pol)	South Africa	Record daily precipitation	38.0 mm (1.5 in)	47 of 100 (Notable)
Nashua 2 NNW	United States	Record daily precipitation	64.3 mm (2.5 in)	47 of 100 (Notable)
Pedra Selada (Pcd)	Brazil	Record daily precipitation	62.2 mm (2.4 in)	46 of 100 (Notable)
Lisbon	United States	Record daily precipitation	33.8 mm (1.3 in)	46 of 100 (Notable)
Ludlow 3 SSE	United States	Record daily precipitation	44.7 mm (1.8 in)	46 of 100 (Notable)
Nachiki	Russia	Record daily precipitation	45.5 mm (1.8 in)	45 of 100 (Notable)
Clocolan (Pol)	South Africa	Record daily precipitation	39.0 mm (1.5 in)	44 of 100 (Notable)
Marquard - Pol 29	South Africa	Record daily precipitation	29.5 mm (1.2 in)	43 of 100 (Notable)
Lamounier	Brazil	Record daily precipitation	45.0 mm (1.8 in)	42 of 100 (Notable)
Usina Do Chicao	Brazil	Record daily precipitation	46.3 mm (1.8 in)	42 of 100 (Notable)
Yakutat AP	United States	Record daily precipitation	139.4 mm (5.5 in)	42 of 100 (Notable)
Belleville	Canada	Record low maximum temperature	11.0 C (51.8 F)	41 of 100 (Notable)
Mequatlingsnek	South Africa	Record daily precipitation	29.5 mm (1.2 in)	41 of 100 (Notable)
Sherburne	United States	Record daily precipitation	39.9 mm (1.6 in)	41 of 100 (Notable)
Usina de Varginha	Brazil	Record daily precipitation	50.0 mm (2.0 in)	40 of 100 (Notable)
Morgenrood	South Africa	Record daily precipitation	31.0 mm (1.2 in)	40 of 100 (Notable)
De Ruyter 4 N	United States	Record daily precipitation	45.0 mm (1.8 in)	40 of 100 (Notable)
Tenosique (Smn)	Mexico	Record daily precipitation	123.4 mm (4.9 in)	39 of 100 (Notable)
Poretskoye	Russia	Record low maximum temperature	3.4 C (38.1 F)	39 of 100 (Notable)
Vaalkop	South Africa	Record daily precipitation	25.5 mm (1.0 in)	39 of 100 (Notable)
Engeland	South Africa	Record daily precipitation	27.0 mm (1.1 in)	39 of 100 (Notable)
Gardiner	United States	Record low maximum temperature	8.9 C (48.0 F)	39 of 100 (Notable)
North End	South Africa	Record daily precipitation	35.5 mm (1.4 in)	38 of 100 (Notable)
Barletta	South Africa	Record daily precipitation	25.5 mm (1.0 in)	38 of 100 (Notable)
Pelserskraal	South Africa	Record daily precipitation	39.0 mm (1.5 in)	38 of 100 (Notable)
Odendaalsrus	South Africa	Record daily precipitation	33.5 mm (1.3 in)	38 of 100 (Notable)
Corumbatai	Brazil	Record daily precipitation	27.7 mm (1.1 in)	37 of 100 (Notable)
Sunny Hills	South Africa	Record daily precipitation	31.8 mm (1.3 in)	37 of 100 (Notable)
Nelsdrift	South Africa	Record daily precipitation	44.0 mm (1.7 in)	37 of 100 (Notable)
Durham	United Kingdom	Record low maximum temperature	9.7 C (49.5 F)	37 of 100 (Notable)
Farmington	United States	Record low maximum temperature	7.8 C (46.0 F)	37 of 100 (Notable)
Newburyport	United States	Record daily precipitation	53.3 mm (2.1 in)	37 of 100 (Notable)
Visconde de Maua (Esc.Agrot)	Brazil	Record daily precipitation	44.0 mm (1.7 in)	36 of 100 (Notable)
Orlandia	Brazil	Record daily precipitation	42.5 mm (1.7 in)	36 of 100 (Notable)
Petropavlovsk-Kamchatskij	Russia	Record daily precipitation	46.6 mm (1.8 in)	36 of 100 (Notable)
Dontsa	South Africa	Record daily precipitation	40.0 mm (1.6 in)	36 of 100 (Notable)
Grootkuil	South Africa	Record daily precipitation	27.5 mm (1.1 in)	36 of 100 (Notable)
Nashua 2 NNW	United States	Record low maximum temperature	10.6 C (51.1 F)	36 of 100 (Notable)
Cedar Lake	United States	Record daily precipitation	59.7 mm (2.4 in)	36 of 100 (Notable)
Altair	Brazil	Record daily precipitation	45.6 mm (1.8 in)	35 of 100 (Notable)
Irkutsk	Russia	Record high maximum temperature	25.6 C (78.1 F)	35 of 100 (Notable)
Monte Carmelo	Brazil	Record daily precipitation	40.0 mm (1.6 in)	34 of 100 (Routine)
Susanville 2SW	United States	Record low minimum temperature	-2.2 C (28.0 F)	34 of 100 (Routine)
Lewiston	United States	Record low maximum temperature	8.3 C (46.9 F)	34 of 100 (Routine)
Galway	Ireland	Record low maximum temperature	11.5 C (52.7 F)	33 of 100 (Routine)
Lambertina	South Africa	Record daily precipitation	26.5 mm (1.0 in)	33 of 100 (Routine)
Amherst	United States	Record low maximum temperature	13.3 C (55.9 F)	33 of 100 (Routine)

Counts by Type and Timescale

918 records

Records set or tied on 21 September 1977 by type: Highest daily maximum 87, Lowest daily maximum 283, Highest daily minimum 68, Lowest daily minimum 68, Heaviest daily rainfall 407, Heaviest daily snowfall 4, Deepest snow cover 1.

Records on 21 September 1977 by type
Record type	Records
Highest daily maximum	87
Lowest daily maximum	283
Highest daily minimum	68
Lowest daily minimum	68
Heaviest daily rainfall	407
Heaviest daily snowfall	4
Deepest snow cover	1

Records on 21 September 1977 by timescale: all-time 0, monthly 13, daily 905.

How Much Records Were Beaten By

795 broken records

Margins by which the 795 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 139.0. Ties are not counted.

Top 20 by Significance

21 September 1977

Top 20 records on 21 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1977	Windham 3 E, US	daily rain	60.5 mm (2.4 in)	41.7 mm (1.6 in)	64 years	65 of 100 (Major)
21 September 1977	Tygerfontein, ZA	monthly rain	103.5 mm (4.1 in)	54.5 mm (2.1 in)	19 years	59 of 100 (Notable)
21 September 1977	Rooijantjiesfontein, ZA	daily rain	38.0 mm (1.5 in)	38.0 mm (1.5 in)	48 years	59 of 100 (Notable)
21 September 1977	Theunissen (Mun), ZA	daily rain	35.0 mm (1.4 in)	35.0 mm (1.4 in)	66 years	55 of 100 (Notable)
21 September 1977	Excelsior (Mun), ZA	daily rain	26.5 mm (1.0 in)	26.5 mm (1.0 in)	64 years	53 of 100 (Notable)
21 September 1977	Brooks Ahrc, CA	daily rain	47.5 mm (1.9 in)	26.9 mm (1.1 in)	20 years	52 of 100 (Notable)
21 September 1977	Palmerville, AU	daily low max	28.0 C (82.4 F)	3.7 C (6.7 F)	77 years	50 of 100 (Notable)
21 September 1977	Cape Vasileva, RU	daily rain	87.2 mm (3.4 in)	67.7 mm (2.7 in)	26 years	50 of 100 (Notable)
21 September 1977	Olivine, ZA	daily rain	27.0 mm (1.1 in)	27.0 mm (1.1 in)	44 years	50 of 100 (Notable)
21 September 1977	Hertzogville (Pol), ZA	daily rain	41.5 mm (1.6 in)	39.0 mm (1.5 in)	32 years	49 of 100 (Notable)
21 September 1977	Edenburg (Pol), ZA	daily rain	31.0 mm (1.2 in)	19.3 mm (0.8 in)	71 years	48 of 100 (Notable)
21 September 1977	Kirklington, ZA	daily rain	30.6 mm (1.2 in)	22.7 mm (0.9 in)	56 years	48 of 100 (Notable)
21 September 1977	Doornpoort, ZA	daily rain	30.0 mm (1.2 in)	25.7 mm (1.0 in)	32 years	47 of 100 (Notable)
21 September 1977	Nietverdiend (Pol), ZA	daily rain	38.0 mm (1.5 in)	36.7 mm (1.4 in)	36 years	47 of 100 (Notable)
21 September 1977	Nashua 2 NNW, US	daily rain	64.3 mm (2.5 in)	19.3 mm (0.8 in)	88 years	47 of 100 (Notable)
21 September 1977	Pedra Selada (Pcd), BR	daily rain	62.2 mm (2.4 in)	42.4 mm (1.7 in)	11 years	46 of 100 (Notable)
21 September 1977	Lisbon, US	daily rain	33.8 mm (1.3 in)	15.3 mm (0.6 in)	71 years	46 of 100 (Notable)
21 September 1977	Ludlow 3 SSE, US	daily rain	44.7 mm (1.8 in)	27.2 mm (1.1 in)	18 years	46 of 100 (Notable)
21 September 1977	Nachiki, RU	daily rain	45.5 mm (1.8 in)	31.7 mm (1.2 in)	26 years	45 of 100 (Notable)
21 September 1977	Clocolan (Pol), ZA	daily rain	39.0 mm (1.5 in)	28.8 mm (1.1 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

1805 to 1977

Records set or tied on this calendar date in each year from 1805 to 1977. 1977 had 918 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	588
2026	469

Download the Data

Data for records on 1977-09-21: 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 2026-10-14 (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 20	736
20 to 40	49
40 to 60	6
60 to 80	2
80 to 100	0
100 to 120	1
120 to 140	1