Weather Records on 1 September 1977

500 weather records were set or tied worldwide on 1 September 1977. Highest significance: Wittenberg, DE.

Key Facts for 1 September 1977

On 1 September 1977, 500 weather records were set or tied at long-record stations worldwide.
167 were record highs and 100 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 27 monthly and 470 daily.
Wittenberg set a monthly record daily precipitation of 68.7 mm (2.7 in) on 1 September 1977.
Across 161 earlier years (1797 to 2026) the same calendar date averaged 441 records.

Record Map

500 stations

500 station records on 1 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 1 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Wittenberg	Germany	Record daily precipitation	68.7 mm (2.7 in)	80 of 100 (Exceptional)
Iturbide	Mexico	Record daily precipitation	179.8 mm (7.1 in)	66 of 100 (Major)
Berlin-Dahlem	Germany	Record daily precipitation	28.1 mm (1.1 in)	62 of 100 (Major)
Morris River	United States	Record daily precipitation	91.9 mm (3.6 in)	59 of 100 (Notable)
Wheatfield	United States	Record daily precipitation	74.9 mm (2.9 in)	55 of 100 (Notable)
Holton	United States	Record daily precipitation	133.6 mm (5.3 in)	54 of 100 (Notable)
Mirassol	Brazil	Record daily precipitation	48.3 mm (1.9 in)	52 of 100 (Notable)
Chicago Midway AP 3SW	United States	Record daily precipitation	74.2 mm (2.9 in)	52 of 100 (Notable)
Utica Starved Rock Dam	United States	Record daily precipitation	74.4 mm (2.9 in)	52 of 100 (Notable)
Grand Is Cntrl NE Rgnl AP	United States	Record daily precipitation	142.7 mm (5.6 in)	52 of 100 (Notable)
Montemorelos	Mexico	Record daily precipitation	145.8 mm (5.7 in)	51 of 100 (Notable)
Detour Village	United States	Record daily precipitation	50.8 mm (2.0 in)	49 of 100 (Notable)
Ingenio Tamazula	Mexico	Record daily precipitation	64.8 mm (2.6 in)	48 of 100 (Notable)
Gary	United States	Record daily precipitation	55.9 mm (2.2 in)	48 of 100 (Notable)
Kedabek	Azerbaijan	Record daily precipitation	34.4 mm (1.4 in)	46 of 100 (Notable)
Ariri	Brazil	Record daily precipitation	133.0 mm (5.2 in)	46 of 100 (Notable)
Renningen-Ihinger Hof	Germany	Record daily precipitation	31.7 mm (1.2 in)	46 of 100 (Notable)
Marseilles Lock/Dam	United States	Record daily precipitation	121.7 mm (4.8 in)	43 of 100 (Notable)
Norwich	United States	Record daily precipitation	81.3 mm (3.2 in)	43 of 100 (Notable)
Khankandy	Azerbaijan	Record daily precipitation	36.5 mm (1.4 in)	42 of 100 (Notable)
Channahon Dresden Isl Dam	United States	Record daily precipitation	62.2 mm (2.4 in)	42 of 100 (Notable)
S Bend AP	United States	Record daily precipitation	76.2 mm (3.0 in)	42 of 100 (Notable)
Dmanisi	Georgia	Record daily precipitation	44.4 mm (1.7 in)	41 of 100 (Notable)
Valparaiso Wtr Wks	United States	Record daily precipitation	44.7 mm (1.8 in)	39 of 100 (Notable)
Rayones	Mexico	Record daily precipitation	124.0 mm (4.9 in)	38 of 100 (Notable)
Tucson WFO	United States	Record high minimum temperature	27.8 C (82.0 F)	38 of 100 (Notable)
Ottawa 4SW	United States	Record daily precipitation	109.2 mm (4.3 in)	38 of 100 (Notable)
Lindsborg 3E	United States	Record daily precipitation	74.9 mm (2.9 in)	38 of 100 (Notable)
Potsdam	Germany	Record daily precipitation	35.7 mm (1.4 in)	37 of 100 (Notable)
Tenosique (Smn)	Mexico	Record high minimum temperature	25.6 C (78.1 F)	37 of 100 (Notable)
Batatais	Brazil	Record daily precipitation	30.8 mm (1.2 in)	36 of 100 (Notable)
Cosmorama	Brazil	Record daily precipitation	28.3 mm (1.1 in)	36 of 100 (Notable)
Munchen-Nymphenburg	Germany	Record high minimum temperature	15.8 C (60.4 F)	35 of 100 (Notable)
Caribou 2 S	United States	Record daily precipitation	66.0 mm (2.6 in)	35 of 100 (Notable)
Onda Verde	Brazil	Record daily precipitation	27.9 mm (1.1 in)	33 of 100 (Routine)
El Dorado	United States	Record daily precipitation	57.2 mm (2.3 in)	33 of 100 (Routine)
Nueva Casas Grandes	Mexico	Record daily precipitation	31.6 mm (1.2 in)	32 of 100 (Routine)
Lawrence	United States	Record daily precipitation	87.6 mm (3.4 in)	32 of 100 (Routine)
Pitangueiras	Brazil	Record daily precipitation	28.0 mm (1.1 in)	31 of 100 (Routine)
Bernburg/Saale (Nord)	Germany	Record high minimum temperature	17.2 C (63.0 F)	31 of 100 (Routine)
Nuevo Casas Grandes (Dge)	Mexico	Record daily precipitation	31.5 mm (1.2 in)	31 of 100 (Routine)
Tepacaltepec	Mexico	Record daily precipitation	59.9 mm (2.4 in)	31 of 100 (Routine)
Joliet Brandon Road Lock/Dam	United States	Record daily precipitation	93.2 mm (3.7 in)	31 of 100 (Routine)
Lucerne	United States	Record daily precipitation	71.1 mm (2.8 in)	31 of 100 (Routine)
Cliff 11 SE	United States	Record daily precipitation	29.0 mm (1.1 in)	31 of 100 (Routine)
Ft Bayard 4W	United States	Record daily precipitation	39.6 mm (1.6 in)	31 of 100 (Routine)
Tbilisi	Georgia	Record low maximum temperature	18.4 C (65.1 F)	30 of 100 (Routine)
Rinconada	Mexico	Record daily precipitation	59.9 mm (2.4 in)	30 of 100 (Routine)
Plymouth Pwr Substn	United States	Record daily precipitation	46.0 mm (1.8 in)	30 of 100 (Routine)
Eskridge	United States	Record daily precipitation	68.1 mm (2.7 in)	30 of 100 (Routine)
Eau Claire 4 NE	United States	Record daily precipitation	49.5 mm (1.9 in)	30 of 100 (Routine)
Ripley	United States	Record high maximum temperature	37.2 C (99.0 F)	30 of 100 (Routine)
Rugby	United States	Record low maximum temperature	14.4 C (57.9 F)	30 of 100 (Routine)
Murdo	United States	Record low maximum temperature	16.1 C (61.0 F)	30 of 100 (Routine)
Kyra	Russia	Record high minimum temperature	15.1 C (59.2 F)	29 of 100 (Routine)
Inman 5SW	United States	Record daily precipitation	62.7 mm (2.5 in)	29 of 100 (Routine)
Amos	Canada	Record high minimum temperature	18.3 C (64.9 F)	28 of 100 (Routine)
Vladivostok	Russia	Record high maximum temperature	28.5 C (83.3 F)	28 of 100 (Routine)
Winkelman 6 S	United States	Record high minimum temperature	26.1 C (79.0 F)	28 of 100 (Routine)
Chillicothe	United States	Record daily precipitation	29.0 mm (1.1 in)	28 of 100 (Routine)

Counts by Type and Timescale

500 records

Records set or tied on 1 September 1977 by type: Highest daily maximum 29, Lowest daily maximum 54, Highest daily minimum 138, Lowest daily minimum 46, Heaviest daily rainfall 231, Heaviest daily snowfall 2.

Records on 1 September 1977 by type
Record type	Records
Highest daily maximum	29
Lowest daily maximum	54
Highest daily minimum	138
Lowest daily minimum	46
Heaviest daily rainfall	231
Heaviest daily snowfall	2
Deepest snow cover	0

Records on 1 September 1977 by timescale: all-time 3, monthly 27, daily 470.

How Much Records Were Beaten By

409 broken records

Margins by which the 409 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 101.9. Ties are not counted.

Top 20 by Significance

1 September 1977

Top 20 records on 1 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 September 1977	Wittenberg, DE	monthly rain	68.7 mm (2.7 in)	23.0 mm (0.9 in)	74 years	80 of 100 (Exceptional)
1 September 1977	Iturbide, MX	all-time rain	179.8 mm (7.1 in)	52.8 mm (2.1 in)	30 years	66 of 100 (Major)
1 September 1977	Berlin-Dahlem, DE	daily rain	28.1 mm (1.1 in)	15.0 mm (0.6 in)	76 years	62 of 100 (Major)
1 September 1977	Morris River, US	daily rain	91.9 mm (3.6 in)	58.9 mm (2.3 in)	44 years	59 of 100 (Notable)
1 September 1977	Wheatfield, US	daily rain	74.9 mm (2.9 in)	55.8 mm (2.2 in)	32 years	55 of 100 (Notable)
1 September 1977	Holton, US	daily rain	133.6 mm (5.3 in)	77.2 mm (3.0 in)	24 years	54 of 100 (Notable)
1 September 1977	Mirassol, BR	daily rain	48.3 mm (1.9 in)	43.9 mm (1.7 in)	30 years	52 of 100 (Notable)
1 September 1977	Chicago Midway AP 3SW, US	daily rain	74.2 mm (2.9 in)	49.6 mm (2.0 in)	24 years	52 of 100 (Notable)
1 September 1977	Utica Starved Rock Dam, US	daily rain	74.4 mm (2.9 in)	51.5 mm (2.0 in)	32 years	52 of 100 (Notable)
1 September 1977	Grand Is Cntrl NE Rgnl AP, US	all-time rain	142.7 mm (5.6 in)	24.6 mm (1.0 in)	27 years	52 of 100 (Notable)
1 September 1977	Montemorelos, MX	daily rain	145.8 mm (5.7 in)	101.9 mm (4.0 in)	22 years	51 of 100 (Notable)
1 September 1977	Detour Village, US	daily rain	50.8 mm (2.0 in)	32.3 mm (1.3 in)	34 years	49 of 100 (Notable)
1 September 1977	Ingenio Tamazula, MX	daily rain	64.8 mm (2.6 in)	34.8 mm (1.4 in)	48 years	48 of 100 (Notable)
1 September 1977	Gary, US	daily rain	55.9 mm (2.2 in)	48.3 mm (1.9 in)	32 years	48 of 100 (Notable)
1 September 1977	Kedabek, AZ	daily rain	34.4 mm (1.4 in)	30.3 mm (1.2 in)	8 years	46 of 100 (Notable)
1 September 1977	Ariri, BR	monthly rain	133.0 mm (5.2 in)	34.0 mm (1.3 in)	27 years	46 of 100 (Notable)
1 September 1977	Renningen-Ihinger Hof, DE	daily rain	31.7 mm (1.2 in)	22.5 mm (0.9 in)	12 years	46 of 100 (Notable)
1 September 1977	Marseilles Lock/Dam, US	monthly rain	121.7 mm (4.8 in)	27.7 mm (1.1 in)	35 years	43 of 100 (Notable)
1 September 1977	Norwich, US	daily rain	81.3 mm (3.2 in)	53.4 mm (2.1 in)	8 years	43 of 100 (Notable)
1 September 1977	Khankandy, AZ	daily rain	36.5 mm (1.4 in)	23.3 mm (0.9 in)	28 years	42 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

1797 to 1977

Records set or tied on this calendar date in each year from 1797 to 1977. 1977 had 500 records.

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

Records on 09-01 in each year
Year	Records
1797	1
1806	1
1819	1
1827	1
1831	1
1838	1
1851	1
1853	1
1854	1
1857	1
1858	1
1859	1
1860	2
1861	1
1865	1
1866	1
1867	2
1869	3
1871	1
1873	1
1876	2
1877	2
1878	3
1879	2
1881	5
1883	1
1886	3
1887	3
1888	2
1890	2
1892	2
1894	3
1897	4
1898	10
1899	3
1900	2
1901	14
1902	5
1903	16
1904	9
1905	6
1906	26
1907	14
1908	26
1909	34
1910	22
1911	16
1912	47
1913	32
1914	23
1915	46
1916	16
1917	24
1918	31
1919	19
1920	31
1921	46
1922	67
1923	75
1924	210
1925	127
1926	182
1927	136
1928	166
1929	324
1930	264
1931	233
1932	550
1933	622
1934	654
1935	584
1936	385
1937	502
1938	373
1939	303
1940	333
1941	497
1942	532
1943	578
1944	377
1945	497
1946	642
1947	555
1948	460
1949	1,102
1950	849
1951	668
1952	644
1953	937
1954	407
1955	413
1956	504
1957	320
1958	427
1959	519
1960	408
1961	531
1962	368
1963	416
1964	621
1965	657
1966	596
1967	1,263
1968	604
1969	493
1970	502
1971	464
1972	518
1973	874
1974	895
1975	939
1976	627
1977	500
1978	809
1979	459
1980	671
1981	649
1982	642
1983	1,167
1984	619
1985	901
1986	964
1987	909
1988	651
1989	823
1990	749
1991	687
1992	1,010
1993	1,122
1994	1,291
1995	1,165
1996	823
1997	1,161
1998	1,159
1999	925
2000	1,613
2001	904
2002	778
2003	1,254
2004	827
2005	901
2006	1,157
2007	976
2008	1,204
2009	1,003
2010	1,313
2011	1,071
2012	874
2013	775
2014	515
2015	661
2016	522
2017	686
2018	399
2019	800
2020	689
2021	751
2022	1,016
2023	720
2024	938
2025	359
2026	521

Download the Data

Data for records on 1977-09-01: 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	367
20 to 40	31
40 to 60	9
60 to 80	1
80 to 100	0
100 to 120	1