Weather Records on 20 September 1991

1,835 weather records were set or tied worldwide on 20 September 1991. Highest significance: Keahua 410, US.

Key Facts for 20 September 1991

On 20 September 1991, 1,835 weather records were set or tied at long-record stations worldwide.
180 were record highs and 1,353 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 74 monthly and 1,761 daily.
Keahua 410 set a monthly record daily precipitation of 38.1 mm (1.5 in) on 20 September 1991.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 433 records.

Record Map

1,835 stations

1,835 station records on 20 September 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Keahua 410	United States	Record daily precipitation	38.1 mm (1.5 in)	68 of 100 (Major)
Wailuku 386	United States	Record daily precipitation	50.8 mm (2.0 in)	62 of 100 (Major)
Porciuncula	Brazil	Record daily precipitation	43.4 mm (1.7 in)	58 of 100 (Notable)
Resplendor-Jusante	Brazil	Record daily precipitation	55.0 mm (2.2 in)	56 of 100 (Notable)
Barra Do Cuiete-Jusante	Brazil	Record daily precipitation	54.8 mm (2.2 in)	55 of 100 (Notable)
Hope	United States	Record low maximum temperature	10.0 C (50.0 F)	53 of 100 (Notable)
Spur	United States	Record low maximum temperature	9.4 C (48.9 F)	51 of 100 (Notable)
Hobbs	United States	Record low maximum temperature	8.9 C (48.0 F)	50 of 100 (Notable)
Rive	Brazil	Record daily precipitation	45.2 mm (1.8 in)	49 of 100 (Notable)
Camden 1	United States	Record low maximum temperature	17.2 C (63.0 F)	49 of 100 (Notable)
Marlin	United States	Record low maximum temperature	18.9 C (66.0 F)	49 of 100 (Notable)
Vermelho Velho	Brazil	Record daily precipitation	65.3 mm (2.6 in)	48 of 100 (Notable)
Malvern	United States	Record low maximum temperature	17.2 C (63.0 F)	47 of 100 (Notable)
Menard	United States	Record low maximum temperature	12.8 C (55.0 F)	47 of 100 (Notable)
Sao Jose Do Calcado	Brazil	Record daily precipitation	55.4 mm (2.2 in)	46 of 100 (Notable)
Crystal Springs Exp STN	United States	Record low maximum temperature	19.4 C (66.9 F)	46 of 100 (Notable)
Marble Hill	United States	Record low maximum temperature	15.0 C (59.0 F)	46 of 100 (Notable)
Alamogordo	United States	Record low maximum temperature	17.2 C (63.0 F)	46 of 100 (Notable)
Ft Sumner	United States	Record low maximum temperature	8.9 C (48.0 F)	46 of 100 (Notable)
Hillsboro	United States	Record low maximum temperature	17.2 C (63.0 F)	46 of 100 (Notable)
Spreckelsville 400	United States	Record daily precipitation	31.2 mm (1.2 in)	46 of 100 (Notable)
Ibitirama (Dnos)	Brazil	Record daily precipitation	69.2 mm (2.7 in)	45 of 100 (Notable)
Usina Fortaleza (Dnos)	Brazil	Record daily precipitation	49.2 mm (1.9 in)	45 of 100 (Notable)
Warren 2 ENE	United States	Record low maximum temperature	16.7 C (62.1 F)	45 of 100 (Notable)
Pearl	United States	Record low maximum temperature	8.3 C (46.9 F)	45 of 100 (Notable)
Tularosa	United States	Record low maximum temperature	17.2 C (63.0 F)	45 of 100 (Notable)
Taloga	United States	Record low maximum temperature	15.6 C (60.1 F)	45 of 100 (Notable)
Portage Wwtp	United States	Record low maximum temperature	8.9 C (48.0 F)	45 of 100 (Notable)
Carangola	Brazil	Record daily precipitation	32.4 mm (1.3 in)	44 of 100 (Notable)
Fredericksburg	United States	Record low maximum temperature	15.6 C (60.1 F)	44 of 100 (Notable)
Lampasas	United States	Record low maximum temperature	12.2 C (54.0 F)	44 of 100 (Notable)
Marfa 3W	United States	Record low maximum temperature	8.9 C (48.0 F)	44 of 100 (Notable)
Redencao da Serra	Brazil	Record daily precipitation	36.1 mm (1.4 in)	43 of 100 (Notable)
Sedalia Wtp	United States	Record low minimum temperature	0.0 C (32.0 F)	43 of 100 (Notable)
Midland 4 ENE	United States	Record low maximum temperature	10.0 C (50.0 F)	43 of 100 (Notable)
Lahaina 361	United States	Record daily precipitation	36.6 mm (1.4 in)	43 of 100 (Notable)
Coroaci	Brazil	Record daily precipitation	38.0 mm (1.5 in)	42 of 100 (Notable)
Jimenez (Smn)	Mexico	Record low maximum temperature	15.0 C (59.0 F)	42 of 100 (Notable)
Osceola	United States	Record low minimum temperature	-1.1 C (30.0 F)	42 of 100 (Notable)
Shelbyville 1 E	United States	Record low minimum temperature	0.6 C (33.1 F)	42 of 100 (Notable)
Okmulgee Wtr Wks	United States	Record low maximum temperature	15.6 C (60.1 F)	42 of 100 (Notable)
Sonora	United States	Record low maximum temperature	13.9 C (57.0 F)	42 of 100 (Notable)
Ojinaga (Smn)	Mexico	Record low maximum temperature	15.0 C (59.0 F)	41 of 100 (Notable)
Warsaw	United States	Record low maximum temperature	13.3 C (55.9 F)	41 of 100 (Notable)
Cresco 1 NE	United States	Record low minimum temperature	-2.8 C (27.0 F)	41 of 100 (Notable)
Waynesboro 2 W	United States	Record low maximum temperature	23.9 C (75.0 F)	41 of 100 (Notable)
Lexington 3E	United States	Record low minimum temperature	0.0 C (32.0 F)	41 of 100 (Notable)
Healdton 3 E	United States	Record low maximum temperature	17.2 C (63.0 F)	41 of 100 (Notable)
Honokohua 493	United States	Record daily precipitation	40.6 mm (1.6 in)	41 of 100 (Notable)
Muniz Freire (Dnos)	Brazil	Record daily precipitation	39.3 mm (1.5 in)	40 of 100 (Notable)
Villa Ahumada	Mexico	Record low maximum temperature	16.7 C (62.1 F)	40 of 100 (Notable)
Albion	United States	Record low maximum temperature	16.1 C (61.0 F)	40 of 100 (Notable)
Watseka Public Works	United States	Record low maximum temperature	13.9 C (57.0 F)	40 of 100 (Notable)
White Hall 1 E	United States	Record low maximum temperature	13.3 C (55.9 F)	40 of 100 (Notable)
Oskaloosa	United States	Record low minimum temperature	-2.8 C (27.0 F)	40 of 100 (Notable)
Amite	United States	Record low maximum temperature	22.8 C (73.0 F)	40 of 100 (Notable)
Detour Village	United States	Record low maximum temperature	10.6 C (51.1 F)	40 of 100 (Notable)
Faribault	United States	Record low minimum temperature	-1.7 C (28.9 F)	40 of 100 (Notable)
Grand Meadow	United States	Record low maximum temperature	4.4 C (39.9 F)	40 of 100 (Notable)
Pine Rvr Dam	United States	Record low maximum temperature	7.8 C (46.0 F)	40 of 100 (Notable)

Counts by Type and Timescale

1,835 records

Records set or tied on 20 September 1991 by type: Highest daily maximum 111, Lowest daily maximum 851, Highest daily minimum 69, Lowest daily minimum 502, Heaviest daily rainfall 302.

Records on 20 September 1991 by type
Record type	Records
Highest daily maximum	111
Lowest daily maximum	851
Highest daily minimum	69
Lowest daily minimum	502
Heaviest daily rainfall	302
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 September 1991 by timescale: all-time 0, monthly 74, daily 1,761.

How Much Records Were Beaten By

1,471 broken records

Margins by which the 1,471 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 63.5. Ties are not counted.

Top 20 by Significance

20 September 1991

Top 20 records on 20 September 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1991	Keahua 410, US	monthly rain	38.1 mm (1.5 in)	15.0 mm (0.6 in)	44 years	68 of 100 (Major)
20 September 1991	Wailuku 386, US	monthly rain	50.8 mm (2.0 in)	21.6 mm (0.9 in)	28 years	62 of 100 (Major)
20 September 1991	Porciuncula, BR	daily rain	43.4 mm (1.7 in)	36.4 mm (1.4 in)	52 years	58 of 100 (Notable)
20 September 1991	Resplendor-Jusante, BR	daily rain	55.0 mm (2.2 in)	45.0 mm (1.8 in)	38 years	56 of 100 (Notable)
20 September 1991	Barra Do Cuiete-Jusante, BR	daily rain	54.8 mm (2.2 in)	46.7 mm (1.8 in)	38 years	55 of 100 (Notable)
20 September 1991	Hope, US	daily low max	10.0 C (50.0 F)	12.2 C (22.0 F)	64 years	53 of 100 (Notable)
20 September 1991	Spur, US	daily low max	9.4 C (48.9 F)	10.0 C (18.0 F)	78 years	51 of 100 (Notable)
20 September 1991	Hobbs, US	daily low max	8.9 C (48.0 F)	10.0 C (18.0 F)	72 years	50 of 100 (Notable)
20 September 1991	Rive, BR	daily rain	45.2 mm (1.8 in)	33.9 mm (1.3 in)	16 years	49 of 100 (Notable)
20 September 1991	Camden 1, US	daily low max	17.2 C (63.0 F)	3.9 C (7.0 F)	100 years	49 of 100 (Notable)
20 September 1991	Marlin, US	daily low max	18.9 C (66.0 F)	5.5 C (9.9 F)	85 years	49 of 100 (Notable)
20 September 1991	Vermelho Velho, BR	daily rain	65.3 mm (2.6 in)	63.5 mm (2.5 in)	16 years	48 of 100 (Notable)
20 September 1991	Malvern, US	daily low max	17.2 C (63.0 F)	3.4 C (6.1 F)	107 years	47 of 100 (Notable)
20 September 1991	Menard, US	daily low max	12.8 C (55.0 F)	8.3 C (14.9 F)	64 years	47 of 100 (Notable)
20 September 1991	Sao Jose Do Calcado, BR	daily rain	55.4 mm (2.2 in)	53.2 mm (2.1 in)	8 years	46 of 100 (Notable)
20 September 1991	Crystal Springs Exp STN, US	daily low max	19.4 C (66.9 F)	3.4 C (6.1 F)	92 years	46 of 100 (Notable)
20 September 1991	Marble Hill, US	daily low max	15.0 C (59.0 F)	4.4 C (7.9 F)	94 years	46 of 100 (Notable)
20 September 1991	Alamogordo, US	daily low max	17.2 C (63.0 F)	6.1 C (11.0 F)	77 years	46 of 100 (Notable)
20 September 1991	Ft Sumner, US	daily low max	8.9 C (48.0 F)	8.9 C (16.0 F)	64 years	46 of 100 (Notable)
20 September 1991	Hillsboro, US	daily low max	17.2 C (63.0 F)	3.4 C (6.1 F)	94 years	46 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 1991

Records set or tied on this calendar date in each year from 1812 to 1991. 1991 had 1,835 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 1991-09-20: 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	1,344
10 to 20	87
20 to 30	29
30 to 40	4
40 to 50	2
50 to 60	4
60 to 70	1