Weather Records on 21 September 2011

542 weather records were set or tied worldwide on 21 September 2011. Highest significance: Shirakawa, JP.

Key Facts for 21 September 2011

On 21 September 2011, 542 weather records were set or tied at long-record stations worldwide.
271 were record highs and 131 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 16 monthly and 523 daily.
Shirakawa set an all-time record daily precipitation of 229.1 mm (9.0 in) on 21 September 2011.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 450 records.

Record Map

542 stations

542 station records on 21 September 2011 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 2011: highest significance records shown on the map
Station	Country	Type	Value	Significance
Shirakawa	Japan	Record daily precipitation	229.1 mm (9.0 in)	66 of 100 (Major)
Langdon Exp Farm	United States	Record daily precipitation	64.0 mm (2.5 in)	66 of 100 (Major)
Matsuyama	Japan	Record daily precipitation	134.6 mm (5.3 in)	61 of 100 (Major)
Ishinomaki	Japan	Record daily precipitation	188.0 mm (7.4 in)	58 of 100 (Notable)
Sendai	Japan	Record daily precipitation	132.1 mm (5.2 in)	57 of 100 (Notable)
Niigata	Japan	Record daily precipitation	97.0 mm (3.8 in)	54 of 100 (Notable)
Angaston	Australia	Record daily precipitation	28.8 mm (1.1 in)	53 of 100 (Notable)
Wakayama	Japan	Record daily precipitation	120.9 mm (4.8 in)	52 of 100 (Notable)
Kobe	Japan	Record daily precipitation	112.0 mm (4.4 in)	51 of 100 (Notable)
Cavalier 7NW	United States	Record daily precipitation	57.1 mm (2.2 in)	51 of 100 (Notable)
Aikawa	Japan	Record daily precipitation	96.0 mm (3.8 in)	50 of 100 (Notable)
Opelika	United States	Record daily precipitation	101.6 mm (4.0 in)	50 of 100 (Notable)
Nikko	Japan	Record daily precipitation	297.9 mm (11.7 in)	49 of 100 (Notable)
Takamatsu	Japan	Record daily precipitation	136.9 mm (5.4 in)	49 of 100 (Notable)
Culver City	United States	Record low minimum temperature	5.6 C (42.1 F)	49 of 100 (Notable)
Shinjo	Japan	Record daily precipitation	71.9 mm (2.8 in)	48 of 100 (Notable)
Kawaguchiko	Japan	Record daily precipitation	225.0 mm (8.9 in)	48 of 100 (Notable)
Ajiro	Japan	Record daily precipitation	192.0 mm (7.6 in)	48 of 100 (Notable)
Richmond Wtr Wks	United States	Record daily precipitation	59.9 mm (2.4 in)	48 of 100 (Notable)
Tsuruga	Japan	Record daily precipitation	152.9 mm (6.0 in)	47 of 100 (Notable)
Wajima	Japan	Record daily precipitation	141.0 mm (5.6 in)	45 of 100 (Notable)
Prilep	Macedonia	Record daily precipitation	43.6 mm (1.7 in)	45 of 100 (Notable)
Pembina	United States	Record daily precipitation	45.7 mm (1.8 in)	45 of 100 (Notable)
Lincolnton 4 W	United States	Record daily precipitation	78.0 mm (3.1 in)	44 of 100 (Notable)
Maizuru Reg Met HQ	Japan	Record daily precipitation	134.1 mm (5.3 in)	43 of 100 (Notable)
Douglas	United States	Record daily precipitation	69.8 mm (2.7 in)	43 of 100 (Notable)
Gaston Shoals	United States	Record daily precipitation	46.5 mm (1.8 in)	43 of 100 (Notable)
Nagoya	Japan	Record daily precipitation	135.4 mm (5.3 in)	41 of 100 (Notable)
Okayama	Japan	Record daily precipitation	71.1 mm (2.8 in)	41 of 100 (Notable)
Oita	Japan	Record daily precipitation	149.1 mm (5.9 in)	41 of 100 (Notable)
Aspendell	United States	Record high minimum temperature	10.0 C (50.0 F)	41 of 100 (Notable)
Edmore 4NW	United States	Record daily precipitation	40.6 mm (1.6 in)	41 of 100 (Notable)
Hachinohe	Japan	Record daily precipitation	70.1 mm (2.8 in)	40 of 100 (Notable)
Fukui	Japan	Record daily precipitation	93.5 mm (3.7 in)	40 of 100 (Notable)
Alvsbyn_A	Sweden	Record daily precipitation	43.1 mm (1.7 in)	40 of 100 (Notable)
Jones Bluff L&D	United States	Record daily precipitation	77.5 mm (3.1 in)	40 of 100 (Notable)
Moore Haven Lock 1	United States	Record high maximum temperature	35.6 C (96.1 F)	40 of 100 (Notable)
Greer	United States	Record daily precipitation	73.2 mm (2.9 in)	40 of 100 (Notable)
Onahama	Japan	Record daily precipitation	141.0 mm (5.6 in)	39 of 100 (Notable)
Clemson UNIV	United States	Record daily precipitation	29.2 mm (1.1 in)	39 of 100 (Notable)
Yamagata	Japan	Record daily precipitation	139.4 mm (5.5 in)	37 of 100 (Notable)
Palisade	United States	Record high minimum temperature	19.4 C (66.9 F)	37 of 100 (Notable)
Juliette	United States	Record daily precipitation	58.4 mm (2.3 in)	37 of 100 (Notable)
Cascajal	Mexico	Record daily precipitation	75.7 mm (3.0 in)	36 of 100 (Notable)
Labuan	Malaysia	Record low minimum temperature	21.0 C (69.8 F)	36 of 100 (Notable)
Kirensk	Russia	Record high minimum temperature	8.4 C (47.1 F)	36 of 100 (Notable)
Elephant Butte Dam	United States	Record high maximum temperature	34.4 C (93.9 F)	36 of 100 (Notable)
Tsu	Japan	Record daily precipitation	122.4 mm (4.8 in)	35 of 100 (Notable)
Wittmann 1SE	United States	Record high maximum temperature	42.8 C (109.0 F)	35 of 100 (Notable)
Shelby 2 NW	United States	Record daily precipitation	52.6 mm (2.1 in)	35 of 100 (Notable)
Santa Maria Ecatepec	Mexico	Record low minimum temperature	10.6 C (51.1 F)	34 of 100 (Routine)
Oneonta	United States	Record daily precipitation	55.9 mm (2.2 in)	34 of 100 (Routine)
Northport	United States	Record high maximum temperature	36.7 C (98.1 F)	34 of 100 (Routine)
Hamamatsu	Japan	Record daily precipitation	155.2 mm (6.1 in)	33 of 100 (Routine)
Alma Bacon Co AP	United States	Record daily precipitation	56.6 mm (2.2 in)	33 of 100 (Routine)
Mersa Matruh	Egypt	Record high maximum temperature	36.6 C (97.9 F)	32 of 100 (Routine)
Ofunato	Japan	Record daily precipitation	92.2 mm (3.6 in)	32 of 100 (Routine)
Michoacanejo	Mexico	Record high maximum temperature	32.2 C (90.0 F)	32 of 100 (Routine)
Ust-Maja	Russia	Record low minimum temperature	-10.7 C (12.7 F)	32 of 100 (Routine)
Izana	Spain	Record high maximum temperature	23.9 C (75.0 F)	32 of 100 (Routine)

Counts by Type and Timescale

542 records

Records set or tied on 21 September 2011 by type: Highest daily maximum 167, Lowest daily maximum 53, Highest daily minimum 104, Lowest daily minimum 78, Heaviest daily rainfall 140.

Records on 21 September 2011 by type
Record type	Records
Highest daily maximum	167
Lowest daily maximum	53
Highest daily minimum	104
Lowest daily minimum	78
Heaviest daily rainfall	140
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 September 2011 by timescale: all-time 3, monthly 16, daily 523.

How Much Records Were Beaten By

380 broken records

Margins by which the 380 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 170.9. Ties are not counted.

Top 20 by Significance

21 September 2011

Top 20 records on 21 September 2011 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 2011	Shirakawa, JP	all-time rain	229.1 mm (9.0 in)	51.6 mm (2.0 in)	50 years	66 of 100 (Major)
21 September 2011	Langdon Exp Farm, US	daily rain	64.0 mm (2.5 in)	36.1 mm (1.4 in)	56 years	66 of 100 (Major)
21 September 2011	Matsuyama, JP	daily rain	134.6 mm (5.3 in)	100.1 mm (3.9 in)	52 years	61 of 100 (Major)
21 September 2011	Ishinomaki, JP	all-time rain	188.0 mm (7.4 in)	44.0 mm (1.7 in)	19 years	58 of 100 (Notable)
21 September 2011	Sendai, JP	daily rain	132.1 mm (5.2 in)	78.0 mm (3.1 in)	44 years	57 of 100 (Notable)
21 September 2011	Niigata, JP	daily rain	97.0 mm (3.8 in)	66.5 mm (2.6 in)	28 years	54 of 100 (Notable)
21 September 2011	Angaston, AU	daily rain	28.8 mm (1.1 in)	8.5 mm (0.33 in)	124 years	53 of 100 (Notable)
21 September 2011	Wakayama, JP	daily rain	120.9 mm (4.8 in)	97.3 mm (3.8 in)	52 years	52 of 100 (Notable)
21 September 2011	Kobe, JP	daily rain	112.0 mm (4.4 in)	76.5 mm (3.0 in)	40 years	51 of 100 (Notable)
21 September 2011	Cavalier 7NW, US	daily rain	57.1 mm (2.2 in)	30.4 mm (1.2 in)	56 years	51 of 100 (Notable)
21 September 2011	Aikawa, JP	daily rain	96.0 mm (3.8 in)	52.5 mm (2.1 in)	28 years	50 of 100 (Notable)
21 September 2011	Opelika, US	daily rain	101.6 mm (4.0 in)	49.8 mm (2.0 in)	53 years	50 of 100 (Notable)
21 September 2011	Nikko, JP	daily rain	297.9 mm (11.7 in)	170.9 mm (6.7 in)	12 years	49 of 100 (Notable)
21 September 2011	Takamatsu, JP	daily rain	136.9 mm (5.4 in)	122.9 mm (4.8 in)	12 years	49 of 100 (Notable)
21 September 2011	Culver City, US	daily low min	5.6 C (42.1 F)	5.5 C (9.9 F)	68 years	49 of 100 (Notable)
21 September 2011	Shinjo, JP	daily rain	71.9 mm (2.8 in)	55.1 mm (2.2 in)	12 years	48 of 100 (Notable)
21 September 2011	Kawaguchiko, JP	daily rain	225.0 mm (8.9 in)	144.2 mm (5.7 in)	8 years	48 of 100 (Notable)
21 September 2011	Ajiro, JP	daily rain	192.0 mm (7.6 in)	104.9 mm (4.1 in)	8 years	48 of 100 (Notable)
21 September 2011	Richmond Wtr Wks, US	daily rain	59.9 mm (2.4 in)	45.4 mm (1.8 in)	18 years	48 of 100 (Notable)
21 September 2011	Tsuruga, JP	daily rain	152.9 mm (6.0 in)	88.9 mm (3.5 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

1805 to 2011

Records set or tied on this calendar date in each year from 1805 to 2011. 2011 had 542 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 2011-09-21: 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 2026-10-13 (13 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 25	334
25 to 50	25
50 to 75	7
75 to 100	7
100 to 125	5
125 to 150	1
150 to 175	1