Weather Records on 18 September 1991

1,377 weather records were set or tied worldwide on 18 September 1991. Highest significance: Ciudad Lerdo (Dge), MX.

Key Facts for 18 September 1991

On 18 September 1991, 1,377 weather records were set or tied at long-record stations worldwide.
595 were record highs and 515 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 29 monthly and 1,348 daily.
Ciudad Lerdo (Dge) set a daily record precipitation of 55.1 mm (2.2 in) on 18 September 1991.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 415 records.

Record Map

1,377 stations

1,377 station records on 18 September 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ciudad Lerdo (Dge)	Mexico	Record daily precipitation	55.1 mm (2.2 in)	53 of 100 (Notable)
Hatch	United States	Record daily precipitation	33.0 mm (1.3 in)	53 of 100 (Notable)
Choibalsan	Mongolia	Record daily precipitation	42.0 mm (1.7 in)	49 of 100 (Notable)
San Marcos	Mexico	Record daily precipitation	51.8 mm (2.0 in)	48 of 100 (Notable)
Ashton Co-Op	Australia	Record daily precipitation	46.8 mm (1.8 in)	47 of 100 (Notable)
Rubicon Sec	Australia	Record daily precipitation	92.6 mm (3.6 in)	47 of 100 (Notable)
Monahans	United States	Record daily precipitation	71.1 mm (2.8 in)	45 of 100 (Notable)
Clare (Hill River)	Australia	Record daily precipitation	30.4 mm (1.2 in)	43 of 100 (Notable)
Pearce - Sunsites	United States	Record low maximum temperature	22.2 C (72.0 F)	43 of 100 (Notable)
New Ulm 2 SE	United States	Record low maximum temperature	6.1 C (43.0 F)	43 of 100 (Notable)
Roseau	United States	Record low maximum temperature	5.6 C (42.1 F)	42 of 100 (Notable)
Toms River	United States	Record high maximum temperature	35.6 C (96.1 F)	42 of 100 (Notable)
Mohall	United States	Record low maximum temperature	5.0 C (41.0 F)	42 of 100 (Notable)
Slaton	United States	Record daily precipitation	67.8 mm (2.7 in)	42 of 100 (Notable)
Warburton (O'Shannassy Reservo	Australia	Record daily precipitation	46.8 mm (1.8 in)	41 of 100 (Notable)
Middletown 4 W	United States	Record high maximum temperature	31.1 C (88.0 F)	41 of 100 (Notable)
College Park	United States	Record high maximum temperature	36.7 C (98.1 F)	41 of 100 (Notable)
Hot Springs	United States	Record low minimum temperature	-5.0 C (23.0 F)	41 of 100 (Notable)
Oelrichs	United States	Record low minimum temperature	-4.4 C (24.1 F)	41 of 100 (Notable)
Foster (Post Office)	Australia	Record daily precipitation	37.0 mm (1.5 in)	40 of 100 (Notable)
Warragul	Australia	Record daily precipitation	34.6 mm (1.4 in)	40 of 100 (Notable)
Vermelho Velho	Brazil	Record daily precipitation	42.0 mm (1.7 in)	40 of 100 (Notable)
Newark Ag Farm	United States	Record high maximum temperature	32.8 C (91.0 F)	40 of 100 (Notable)
Forest City 2 NNE	United States	Record low maximum temperature	9.4 C (48.9 F)	40 of 100 (Notable)
Boonton 1 SE	United States	Record high maximum temperature	32.8 C (91.0 F)	40 of 100 (Notable)
Grafton	United States	Record low maximum temperature	7.8 C (46.0 F)	40 of 100 (Notable)
Jamestown State Hosp	United States	Record low maximum temperature	5.0 C (41.0 F)	40 of 100 (Notable)
Ashland	United States	Record high maximum temperature	35.6 C (96.1 F)	40 of 100 (Notable)
Hagerstown 1E	United States	Record daily precipitation	126.5 mm (5.0 in)	39 of 100 (Notable)
Taunton	United States	Record high maximum temperature	32.2 C (90.0 F)	39 of 100 (Notable)
Fairmont	United States	Record low maximum temperature	8.9 C (48.0 F)	39 of 100 (Notable)
O'Neill	United States	Record low minimum temperature	-5.0 C (23.0 F)	39 of 100 (Notable)
Clearwater	United States	Record high maximum temperature	28.3 C (82.9 F)	39 of 100 (Notable)
Bayfield 6 N	United States	Record low minimum temperature	2.8 C (37.0 F)	39 of 100 (Notable)
Chilton	United States	Record low maximum temperature	11.1 C (52.0 F)	39 of 100 (Notable)
Trafalgar Toseland Road	Australia	Record daily precipitation	38.8 mm (1.5 in)	38 of 100 (Notable)
Birni N'Konni	Niger	Record daily precipitation	75.9 mm (3.0 in)	38 of 100 (Notable)
Belfast	United States	Record high maximum temperature	29.4 C (84.9 F)	38 of 100 (Notable)
Tecumseh 1W	United States	Record daily precipitation	66.0 mm (2.6 in)	38 of 100 (Notable)
Toms River	United States	Record high minimum temperature	20.6 C (69.1 F)	38 of 100 (Notable)
Klamath Falls 2 SSW	United States	Record high maximum temperature	32.8 C (91.0 F)	38 of 100 (Notable)
Walhalla	United States	Record high minimum temperature	20.6 C (69.1 F)	38 of 100 (Notable)
Fergus Falls	United States	Record low maximum temperature	7.8 C (46.0 F)	37 of 100 (Notable)
Jefferson City Wtp	United States	Record low maximum temperature	14.4 C (57.9 F)	37 of 100 (Notable)
Windsor	United States	Record low minimum temperature	0.0 C (32.0 F)	37 of 100 (Notable)
Grand Forks UNIV (NWS)	United States	Record low maximum temperature	8.3 C (46.9 F)	37 of 100 (Notable)
Wahpeton 3 N	United States	Record low maximum temperature	9.4 C (48.9 F)	37 of 100 (Notable)
Belle Fourche	United States	Record low minimum temperature	-3.9 C (25.0 F)	37 of 100 (Notable)
Clear Lake	United States	Record low minimum temperature	1.1 C (34.0 F)	37 of 100 (Notable)
Wessington Springs	United States	Record low minimum temperature	1.1 C (34.0 F)	37 of 100 (Notable)
Asheville	United States	Record high minimum temperature	19.4 C (66.9 F)	37 of 100 (Notable)
Guntersville	United States	Record high maximum temperature	35.6 C (96.1 F)	36 of 100 (Notable)
1 ENE Fairfield	United States	Record low maximum temperature	17.2 C (63.0 F)	36 of 100 (Notable)
Warrenton 1 N	United States	Record low maximum temperature	15.0 C (59.0 F)	36 of 100 (Notable)
Fairmont	United States	Record low minimum temperature	-1.7 C (28.9 F)	36 of 100 (Notable)
Hay Springs	United States	Record low minimum temperature	-4.4 C (24.1 F)	36 of 100 (Notable)
Ravenna	United States	Record low minimum temperature	-3.3 C (26.1 F)	36 of 100 (Notable)
Hobbs	United States	Record daily precipitation	128.3 mm (5.1 in)	36 of 100 (Notable)
Fullerton 1 ESE	United States	Record low maximum temperature	6.7 C (44.1 F)	36 of 100 (Notable)
Mc Henry 3W	United States	Record low maximum temperature	5.0 C (41.0 F)	36 of 100 (Notable)

Counts by Type and Timescale

1,377 records

Records set or tied on 18 September 1991 by type: Highest daily maximum 335, Lowest daily maximum 270, Highest daily minimum 260, Lowest daily minimum 245, Heaviest daily rainfall 262, Heaviest daily snowfall 5.

Records on 18 September 1991 by type
Record type	Records
Highest daily maximum	335
Lowest daily maximum	270
Highest daily minimum	260
Lowest daily minimum	245
Heaviest daily rainfall	262
Heaviest daily snowfall	5
Deepest snow cover	0

Records on 18 September 1991 by timescale: all-time 0, monthly 29, daily 1,348.

How Much Records Were Beaten By

1,082 broken records

Margins by which the 1,082 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 55.9. Ties are not counted.

Top 20 by Significance

18 September 1991

Top 20 records on 18 September 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1991	Ciudad Lerdo (Dge), MX	daily rain	55.1 mm (2.2 in)	42.1 mm (1.7 in)	26 years	53 of 100 (Notable)
18 September 1991	Hatch, US	daily rain	33.0 mm (1.3 in)	15.7 mm (0.6 in)	94 years	53 of 100 (Notable)
18 September 1991	Choibalsan, MN	monthly rain	42.0 mm (1.7 in)	14.0 mm (0.6 in)	22 years	49 of 100 (Notable)
18 September 1991	San Marcos, MX	daily rain	51.8 mm (2.0 in)	35.0 mm (1.4 in)	28 years	48 of 100 (Notable)
18 September 1991	Ashton Co-Op, AU	daily rain	46.8 mm (1.8 in)	32.1 mm (1.3 in)	36 years	47 of 100 (Notable)
18 September 1991	Rubicon Sec, AU	daily rain	92.6 mm (3.6 in)	51.6 mm (2.0 in)	10 years	47 of 100 (Notable)
18 September 1991	Monahans, US	daily rain	71.1 mm (2.8 in)	55.9 mm (2.2 in)	20 years	45 of 100 (Notable)
18 September 1991	Clare (Hill River), AU	daily rain	30.4 mm (1.2 in)	8.0 mm (0.31 in)	78 years	43 of 100 (Notable)
18 September 1991	Pearce - Sunsites, US	daily low max	22.2 C (72.0 F)	4.5 C (8.1 F)	73 years	43 of 100 (Notable)
18 September 1991	New Ulm 2 SE, US	daily low max	6.1 C (43.0 F)	5.0 C (9.0 F)	89 years	43 of 100 (Notable)
18 September 1991	Roseau, US	daily low max	5.6 C (42.1 F)	3.3 C (5.9 F)	94 years	42 of 100 (Notable)
18 September 1991	Toms River, US	daily high max	35.6 C (96.1 F)	2.3 C (4.1 F)	92 years	42 of 100 (Notable)
18 September 1991	Mohall, US	daily low max	5.0 C (41.0 F)	5.0 C (9.0 F)	89 years	42 of 100 (Notable)
18 September 1991	Slaton, US	daily rain	67.8 mm (2.7 in)	43.4 mm (1.7 in)	20 years	42 of 100 (Notable)
18 September 1991	Warburton (O'Shannassy Reservo, AU	daily rain	46.8 mm (1.8 in)	14.8 mm (0.6 in)	65 years	41 of 100 (Notable)
18 September 1991	Middletown 4 W, US	daily high max	31.1 C (88.0 F)	1.1 C (2.0 F)	99 years	41 of 100 (Notable)
18 September 1991	College Park, US	daily high max	36.7 C (98.1 F)	2.3 C (4.1 F)	92 years	41 of 100 (Notable)
18 September 1991	Hot Springs, US	daily low min	-5.0 C (23.0 F)	2.8 C (5.0 F)	91 years	41 of 100 (Notable)
18 September 1991	Oelrichs, US	daily low min	-4.4 C (24.1 F)	2.2 C (4.0 F)	94 years	41 of 100 (Notable)
18 September 1991	Foster (Post Office), AU	daily rain	37.0 mm (1.5 in)	0.9 mm (0.04 in)	97 years	40 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

1803 to 1991

Records set or tied on this calendar date in each year from 1803 to 1991. 1991 had 1,377 records.

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

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1991-09-18: 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	1,013
10 to 20	39
20 to 30	13
30 to 40	7
40 to 50	6
50 to 60	4