Weather Records on 25 September 1977

875 weather records were set or tied worldwide on 25 September 1977. Highest significance: Portageville 1N, US.

Key Facts for 25 September 1977

On 25 September 1977, 875 weather records were set or tied at long-record stations worldwide.
327 were record highs and 135 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 38 monthly and 837 daily.
Portageville 1N set a daily record precipitation of 57.7 mm (2.3 in) on 25 September 1977.
Across 163 earlier years (1825 to 2026) the same calendar date averaged 423 records.

Record Map

875 stations

875 station records on 25 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 25 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Portageville 1N	United States	Record daily precipitation	57.7 mm (2.3 in)	70 of 100 (Major)
Simferopol	Ukraine	Record daily precipitation	43.9 mm (1.7 in)	67 of 100 (Major)
Jackson Exp STN	United States	Record daily precipitation	70.1 mm (2.8 in)	63 of 100 (Major)
Ridgetown	Canada	Record daily precipitation	60.0 mm (2.4 in)	62 of 100 (Major)
Maseru	Lesotho	Record daily precipitation	38.4 mm (1.5 in)	58 of 100 (Notable)
Mt Morris 2W	United States	Record daily precipitation	46.0 mm (1.8 in)	56 of 100 (Notable)
Byhalia	United States	Record daily precipitation	84.8 mm (3.3 in)	55 of 100 (Notable)
Port Stanley	Canada	Record daily precipitation	45.2 mm (1.8 in)	54 of 100 (Notable)
Klepinino	Ukraine	Record daily precipitation	31.6 mm (1.2 in)	54 of 100 (Notable)
Clocolan (Pol)	South Africa	Record daily precipitation	46.0 mm (1.8 in)	53 of 100 (Notable)
Des Arc	United States	Record daily precipitation	78.5 mm (3.1 in)	53 of 100 (Notable)
Savannah 6 SW	United States	Record daily precipitation	67.8 mm (2.7 in)	53 of 100 (Notable)
Barnes	United States	Record daily precipitation	54.6 mm (2.1 in)	52 of 100 (Notable)
Ponta da Praia	Brazil	Record daily precipitation	101.1 mm (4.0 in)	50 of 100 (Notable)
Hickory Flat	United States	Record daily precipitation	68.6 mm (2.7 in)	50 of 100 (Notable)
Paris 3 ESE	United States	Record daily precipitation	78.7 mm (3.1 in)	50 of 100 (Notable)
Barro Vermelho (Ibipitanga)	Brazil	Record daily precipitation	42.6 mm (1.7 in)	49 of 100 (Notable)
Dickson	United States	Record daily precipitation	61.2 mm (2.4 in)	49 of 100 (Notable)
Georgetown	United States	Record daily precipitation	106.7 mm (4.2 in)	48 of 100 (Notable)
Ruy Barbosa	Brazil	Record daily precipitation	29.0 mm (1.1 in)	47 of 100 (Notable)
Mt Pleasant 4SW	United States	Record daily precipitation	98.0 mm (3.9 in)	47 of 100 (Notable)
Bolton	United States	Record daily precipitation	88.4 mm (3.5 in)	47 of 100 (Notable)
Gorjacij Kljuc	Russia	Record daily precipitation	47.7 mm (1.9 in)	46 of 100 (Notable)
Pontotoc	United States	Record daily precipitation	50.8 mm (2.0 in)	46 of 100 (Notable)
Ripley	United States	Record daily precipitation	47.0 mm (1.9 in)	46 of 100 (Notable)
Vance 1 SW	United States	Record daily precipitation	77.0 mm (3.0 in)	46 of 100 (Notable)
Konstantinovsk	Russia	Record daily precipitation	30.9 mm (1.2 in)	45 of 100 (Notable)
Corinth 5 WSW	United States	Record daily precipitation	79.2 mm (3.1 in)	45 of 100 (Notable)
Canandaigua 3 S	United States	Record daily precipitation	45.0 mm (1.8 in)	45 of 100 (Notable)
Moscow	United States	Record daily precipitation	85.1 mm (3.4 in)	45 of 100 (Notable)
Serowe	Botswana	Record daily precipitation	29.5 mm (1.2 in)	44 of 100 (Notable)
Vicente de Carvalho	Brazil	Record daily precipitation	85.5 mm (3.4 in)	44 of 100 (Notable)
Milan Exp STN	United States	Record daily precipitation	51.6 mm (2.0 in)	44 of 100 (Notable)
Pleasant Hill	United States	Record daily precipitation	91.2 mm (3.6 in)	43 of 100 (Notable)
Addison	United States	Record daily precipitation	40.6 mm (1.6 in)	43 of 100 (Notable)
Searcy	United States	Record daily precipitation	92.2 mm (3.6 in)	42 of 100 (Notable)
Dansville	United States	Record daily precipitation	39.1 mm (1.5 in)	42 of 100 (Notable)
Martin U of T Branch Exp STN	United States	Record daily precipitation	72.6 mm (2.9 in)	42 of 100 (Notable)
Sion	Canada	Record daily precipitation	25.7 mm (1.0 in)	41 of 100 (Notable)
Nizhny-Chir	Russia	Record daily precipitation	27.2 mm (1.1 in)	41 of 100 (Notable)
Wonderboom	South Africa	Record daily precipitation	38.0 mm (1.5 in)	41 of 100 (Notable)
Charleston	United States	Record daily precipitation	46.5 mm (1.8 in)	41 of 100 (Notable)
Brownsville	United States	Record daily precipitation	58.4 mm (2.3 in)	41 of 100 (Notable)
Sao Goncalo Dos Campos	Brazil	Record daily precipitation	120.0 mm (4.7 in)	40 of 100 (Notable)
Minas Nuevas	Mexico	Record daily precipitation	53.3 mm (2.1 in)	40 of 100 (Notable)
Gorodovikovsk	Russia	Record daily precipitation	26.5 mm (1.0 in)	40 of 100 (Notable)
Petrusberg (Pol)	South Africa	Record daily precipitation	38.0 mm (1.5 in)	40 of 100 (Notable)
Tweespruit	South Africa	Record daily precipitation	46.0 mm (1.8 in)	39 of 100 (Notable)
Ashland	United States	Record daily precipitation	62.7 mm (2.5 in)	39 of 100 (Notable)
University	United States	Record daily precipitation	45.7 mm (1.8 in)	39 of 100 (Notable)
Bowie	United States	Record high maximum temperature	42.2 C (108.0 F)	39 of 100 (Notable)
Guarani	Brazil	Record daily precipitation	42.2 mm (1.7 in)	38 of 100 (Notable)
Convamore	South Africa	Record daily precipitation	38.0 mm (1.5 in)	38 of 100 (Notable)
E Stroudsburg	United States	Record daily precipitation	45.0 mm (1.8 in)	38 of 100 (Notable)
St Catharines	Canada	Record daily precipitation	25.0 mm (1.0 in)	37 of 100 (Notable)
Doornplaat	South Africa	Record daily precipitation	35.0 mm (1.4 in)	37 of 100 (Notable)
Kane 1NNE	United States	Record daily precipitation	37.3 mm (1.5 in)	37 of 100 (Notable)
Porciuncula	Brazil	Record daily precipitation	43.2 mm (1.7 in)	36 of 100 (Notable)
Fazenda Sao Gabriel	Brazil	Record daily precipitation	35.0 mm (1.4 in)	36 of 100 (Notable)
Delhi Cda	Canada	Record daily precipitation	40.1 mm (1.6 in)	36 of 100 (Notable)

Counts by Type and Timescale

875 records

Records set or tied on 25 September 1977 by type: Highest daily maximum 153, Lowest daily maximum 75, Highest daily minimum 174, Lowest daily minimum 60, Heaviest daily rainfall 413.

Records on 25 September 1977 by type
Record type	Records
Highest daily maximum	153
Lowest daily maximum	75
Highest daily minimum	174
Lowest daily minimum	60
Heaviest daily rainfall	413
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 25 September 1977 by timescale: all-time 0, monthly 38, daily 837.

How Much Records Were Beaten By

695 broken records

Margins by which the 695 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 86.3. Ties are not counted.

Top 20 by Significance

25 September 1977

Top 20 records on 25 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 September 1977	Portageville 1N, US	daily rain	57.7 mm (2.3 in)	39.9 mm (1.6 in)	75 years	70 of 100 (Major)
25 September 1977	Simferopol, UA	monthly rain	43.9 mm (1.7 in)	12.5 mm (0.5 in)	90 years	67 of 100 (Major)
25 September 1977	Jackson Exp STN, US	daily rain	70.1 mm (2.8 in)	51.8 mm (2.0 in)	72 years	63 of 100 (Major)
25 September 1977	Ridgetown, CA	daily rain	60.0 mm (2.4 in)	39.7 mm (1.6 in)	46 years	62 of 100 (Major)
25 September 1977	Maseru, LS	daily rain	38.4 mm (1.5 in)	33.1 mm (1.3 in)	72 years	58 of 100 (Notable)
25 September 1977	Mt Morris 2W, US	daily rain	46.0 mm (1.8 in)	35.6 mm (1.4 in)	28 years	56 of 100 (Notable)
25 September 1977	Byhalia, US	daily rain	84.8 mm (3.3 in)	68.3 mm (2.7 in)	32 years	55 of 100 (Notable)
25 September 1977	Port Stanley, CA	daily rain	45.2 mm (1.8 in)	22.8 mm (0.9 in)	62 years	54 of 100 (Notable)
25 September 1977	Klepinino, UA	daily rain	31.6 mm (1.2 in)	21.6 mm (0.9 in)	38 years	54 of 100 (Notable)
25 September 1977	Clocolan (Pol), ZA	daily rain	46.0 mm (1.8 in)	38.4 mm (1.5 in)	27 years	53 of 100 (Notable)
25 September 1977	Des Arc, US	daily rain	78.5 mm (3.1 in)	49.8 mm (2.0 in)	36 years	53 of 100 (Notable)
25 September 1977	Savannah 6 SW, US	daily rain	67.8 mm (2.7 in)	30.7 mm (1.2 in)	83 years	53 of 100 (Notable)
25 September 1977	Barnes, US	daily rain	54.6 mm (2.1 in)	44.4 mm (1.7 in)	32 years	52 of 100 (Notable)
25 September 1977	Ponta da Praia, BR	daily rain	101.1 mm (4.0 in)	77.9 mm (3.1 in)	20 years	50 of 100 (Notable)
25 September 1977	Hickory Flat, US	daily rain	68.6 mm (2.7 in)	48.8 mm (1.9 in)	59 years	50 of 100 (Notable)
25 September 1977	Paris 3 ESE, US	daily rain	78.7 mm (3.1 in)	52.8 mm (2.1 in)	26 years	50 of 100 (Notable)
25 September 1977	Barro Vermelho (Ibipitanga), BR	monthly rain	42.6 mm (1.7 in)	29.8 mm (1.2 in)	22 years	49 of 100 (Notable)
25 September 1977	Dickson, US	daily rain	61.2 mm (2.4 in)	31.2 mm (1.2 in)	72 years	49 of 100 (Notable)
25 September 1977	Georgetown, US	daily rain	106.7 mm (4.2 in)	54.6 mm (2.1 in)	40 years	48 of 100 (Notable)
25 September 1977	Ruy Barbosa, BR	daily rain	29.0 mm (1.1 in)	25.0 mm (1.0 in)	12 years	47 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

1825 to 1977

Records set or tied on this calendar date in each year from 1825 to 1977. 1977 had 875 records.

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

Records on 09-25 in each year
Year	Records
1825	1
1834	1
1836	1
1842	1
1843	1
1847	1
1851	1
1852	1
1855	1
1857	2
1859	1
1860	1
1863	1
1865	1
1866	2
1867	2
1868	1
1871	2
1872	1
1874	1
1875	1
1877	3
1879	2
1881	3
1884	3
1885	6
1886	1
1887	3
1889	7
1891	3
1893	7
1894	3
1895	5
1896	5
1897	2
1898	1
1899	2
1900	7
1901	6
1902	11
1903	4
1904	10
1905	16
1906	7
1907	35
1908	20
1909	22
1910	5
1911	9
1912	63
1913	13
1914	15
1915	43
1916	139
1917	138
1918	16
1919	20
1920	75
1921	32
1922	47
1923	68
1924	157
1925	141
1926	740
1927	166
1928	480
1929	158
1930	489
1931	500
1932	260
1933	542
1934	394
1935	258
1936	274
1937	190
1938	335
1939	454
1940	517
1941	269
1942	970
1943	488
1944	246
1945	514
1946	292
1947	666
1948	501
1949	479
1950	1,163
1951	639
1952	515
1953	242
1954	292
1955	546
1956	503
1957	231
1958	454
1959	396
1960	694
1961	530
1962	305
1963	602
1964	403
1965	690
1966	334
1967	428
1968	300
1969	196
1970	783
1971	323
1972	706
1973	650
1974	995
1975	1,166
1976	541
1977	875
1978	462
1979	719
1980	687
1981	669
1982	759
1983	647
1984	1,305
1985	446
1986	1,766
1987	560
1988	571
1989	1,367
1990	875
1991	1,243
1992	1,346
1993	1,015
1994	666
1995	1,013
1996	648
1997	1,278
1998	1,346
1999	804
2000	1,536
2001	1,536
2002	876
2003	758
2004	519
2005	1,484
2006	767
2007	1,284
2008	766
2009	854
2010	1,125
2011	763
2012	505
2013	615
2014	800
2015	868
2016	781
2017	1,253
2018	648
2019	530
2020	1,089
2021	355
2022	301
2023	580
2024	1,120
2025	569
2026	473

Download the Data

Data for records on 1977-09-25: 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	616
20 to 40	55
40 to 60	17
60 to 80	5
80 to 100	2