Weather Records on 21 September 1931

681 weather records were set or tied worldwide on 21 September 1931. Highest significance: Mohanpur, IN.

Key Facts for 21 September 1931

On 21 September 1931, 681 weather records were set or tied at long-record stations worldwide.
480 were record highs and 46 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 19 monthly and 662 daily.
Mohanpur set a monthly record daily precipitation of 186.4 mm (7.3 in) on 21 September 1931.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 450 records.

Record Map

681 stations

681 station records on 21 September 1931 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1931: highest significance records shown on the map
Station	Country	Type	Value	Significance
Mohanpur	India	Record daily precipitation	186.4 mm (7.3 in)	60 of 100 (Major)
Anthony	United States	Record daily precipitation	76.5 mm (3.0 in)	51 of 100 (Notable)
Norwich	United States	Record daily precipitation	109.0 mm (4.3 in)	44 of 100 (Notable)
St Joseph	United States	Record daily precipitation	66.8 mm (2.6 in)	44 of 100 (Notable)
Mt Hope	United States	Record daily precipitation	64.5 mm (2.5 in)	38 of 100 (Notable)
Cheyyar	India	Record daily precipitation	81.3 mm (3.2 in)	37 of 100 (Notable)
Trenton	United States	Record daily precipitation	73.7 mm (2.9 in)	37 of 100 (Notable)
Daryapur	India	Record daily precipitation	82.6 mm (3.3 in)	36 of 100 (Notable)
Orenburg	Russia	Record daily precipitation	30.6 mm (1.2 in)	36 of 100 (Notable)
Ottawa	United States	Record daily precipitation	90.2 mm (3.6 in)	35 of 100 (Notable)
Winnipeg St Johns Coll	Canada	Record daily precipitation	30.2 mm (1.2 in)	34 of 100 (Routine)
Olathe 3E	United States	Record daily precipitation	63.8 mm (2.5 in)	34 of 100 (Routine)
Conception	United States	Record daily precipitation	73.7 mm (2.9 in)	34 of 100 (Routine)
Unionville	United States	Record daily precipitation	64.8 mm (2.6 in)	34 of 100 (Routine)
Wamego 4 W	United States	Record daily precipitation	43.9 mm (1.7 in)	31 of 100 (Routine)
Washington	United States	Record daily precipitation	63.0 mm (2.5 in)	30 of 100 (Routine)
Oregon	United States	Record daily precipitation	82.0 mm (3.2 in)	30 of 100 (Routine)
Horton	United States	Record daily precipitation	81.3 mm (3.2 in)	29 of 100 (Routine)
Genoa 2 W	United States	Record daily precipitation	37.6 mm (1.5 in)	29 of 100 (Routine)
St Albans	Canada	Record daily precipitation	37.1 mm (1.5 in)	28 of 100 (Routine)
Atchison	United States	Record daily precipitation	74.7 mm (2.9 in)	28 of 100 (Routine)
Newton	United States	Record daily precipitation	67.6 mm (2.7 in)	28 of 100 (Routine)
Pratt 3NW	United States	Record daily precipitation	35.1 mm (1.4 in)	28 of 100 (Routine)
Fairfield	United States	Record daily precipitation	68.6 mm (2.7 in)	26 of 100 (Routine)
Rehli	India	Record daily precipitation	52.1 mm (2.1 in)	25 of 100 (Routine)
Rajapur	India	Record daily precipitation	77.5 mm (3.1 in)	25 of 100 (Routine)
Mt Ayr	United States	Record daily precipitation	52.1 mm (2.1 in)	25 of 100 (Routine)
Maryville 2E	United States	Record daily precipitation	44.2 mm (1.7 in)	25 of 100 (Routine)
Quakertown	United States	Record high maximum temperature	34.4 C (93.9 F)	25 of 100 (Routine)
Prentice #2	United States	Record daily precipitation	57.7 mm (2.3 in)	25 of 100 (Routine)
Borsad	India	Record daily precipitation	82.8 mm (3.3 in)	24 of 100 (Routine)
Mercanam	India	Record daily precipitation	54.9 mm (2.2 in)	24 of 100 (Routine)
Albia 3 NNE	United States	Record daily precipitation	38.9 mm (1.5 in)	24 of 100 (Routine)
Oskaloosa	United States	Record daily precipitation	45.5 mm (1.8 in)	24 of 100 (Routine)
Osage City	United States	Record daily precipitation	91.4 mm (3.6 in)	24 of 100 (Routine)
Jennings	United States	Record high minimum temperature	26.7 C (80.1 F)	24 of 100 (Routine)
Jacksonville Wb City	United States	Record high minimum temperature	25.6 C (78.1 F)	24 of 100 (Routine)
Leipzig-Holzhausen	Germany	Record low maximum temperature	10.6 C (51.1 F)	23 of 100 (Routine)
Burlington	United States	Record daily precipitation	106.7 mm (4.2 in)	23 of 100 (Routine)
Palitana	India	Record daily precipitation	66.0 mm (2.6 in)	22 of 100 (Routine)
Vastervik	Sweden	Record low maximum temperature	9.0 C (48.2 F)	22 of 100 (Routine)
Granite Reef Dam	United States	Record low minimum temperature	10.6 C (51.1 F)	22 of 100 (Routine)
Storm Lake	United States	Record daily precipitation	32.8 mm (1.3 in)	22 of 100 (Routine)
Emporia 1 S	United States	Record daily precipitation	50.8 mm (2.0 in)	22 of 100 (Routine)
Manhattan	United States	Record daily precipitation	28.7 mm (1.1 in)	22 of 100 (Routine)
Mt Sterling	United States	Record high maximum temperature	35.6 C (96.1 F)	22 of 100 (Routine)
Bethany	United States	Record daily precipitation	55.4 mm (2.2 in)	22 of 100 (Routine)
Osceola	United States	Record daily precipitation	30.2 mm (1.2 in)	22 of 100 (Routine)
Dubuque River	United States	Record daily precipitation	30.7 mm (1.2 in)	22 of 100 (Routine)
Tittagudi	India	Record daily precipitation	38.9 mm (1.5 in)	21 of 100 (Routine)
Chariton 1 E	United States	Record daily precipitation	66.5 mm (2.6 in)	21 of 100 (Routine)
Grinnell 3 SW	United States	Record daily precipitation	36.8 mm (1.4 in)	21 of 100 (Routine)
Midland 2	United States	Record high minimum temperature	22.8 C (73.0 F)	21 of 100 (Routine)
Grant City	United States	Record daily precipitation	59.9 mm (2.4 in)	21 of 100 (Routine)
Hendersonville 1 NE	United States	Record high maximum temperature	34.4 C (93.9 F)	21 of 100 (Routine)
Fort Macleod	Canada	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Swift Current	Canada	Record daily precipitation	10.9 mm (0.4 in)	20 of 100 (Routine)
Cheljabinsk-Balandi	Russia	Record daily precipitation	20.2 mm (0.8 in)	20 of 100 (Routine)
Dickinson Exp STN	United States	Record daily precipitation	23.4 mm (0.9 in)	20 of 100 (Routine)
Haileybury	Canada	Record daily precipitation	33.3 mm (1.3 in)	20 of 100 (Routine)

Counts by Type and Timescale

681 records

Records set or tied on 21 September 1931 by type: Highest daily maximum 193, Lowest daily maximum 26, Highest daily minimum 287, Lowest daily minimum 20, Heaviest daily rainfall 153, Deepest snow cover 2.

Records on 21 September 1931 by type
Record type	Records
Highest daily maximum	193
Lowest daily maximum	26
Highest daily minimum	287
Lowest daily minimum	20
Heaviest daily rainfall	153
Heaviest daily snowfall	0
Deepest snow cover	2

Records on 21 September 1931 by timescale: all-time 0, monthly 19, daily 662.

How Much Records Were Beaten By

530 broken records

Margins by which the 530 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 101.3. Ties are not counted.

Top 20 by Significance

21 September 1931

Top 20 records on 21 September 1931 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1931	Mohanpur, IN	monthly rain	186.4 mm (7.3 in)	101.3 mm (4.0 in)	26 years	60 of 100 (Major)
21 September 1931	Anthony, US	daily rain	76.5 mm (3.0 in)	67.4 mm (2.7 in)	26 years	51 of 100 (Notable)
21 September 1931	Norwich, US	daily rain	109.0 mm (4.3 in)	84.6 mm (3.3 in)	5 years	44 of 100 (Notable)
21 September 1931	St Joseph, US	daily rain	66.8 mm (2.6 in)	52.6 mm (2.1 in)	20 years	44 of 100 (Notable)
21 September 1931	Mt Hope, US	monthly rain	64.5 mm (2.5 in)	19.3 mm (0.8 in)	26 years	38 of 100 (Notable)
21 September 1931	Cheyyar, IN	daily rain	81.3 mm (3.2 in)	49.5 mm (1.9 in)	24 years	37 of 100 (Notable)
21 September 1931	Trenton, US	daily rain	73.7 mm (2.9 in)	49.8 mm (2.0 in)	16 years	37 of 100 (Notable)
21 September 1931	Daryapur, IN	daily rain	82.6 mm (3.3 in)	60.8 mm (2.4 in)	5 years	36 of 100 (Notable)
21 September 1931	Orenburg, RU	monthly rain	30.6 mm (1.2 in)	7.9 mm (0.31 in)	4 years	36 of 100 (Notable)
21 September 1931	Ottawa, US	daily rain	90.2 mm (3.6 in)	54.6 mm (2.1 in)	5 years	35 of 100 (Notable)
21 September 1931	Winnipeg St Johns Coll, CA	daily rain	30.2 mm (1.2 in)	19.8 mm (0.8 in)	16 years	34 of 100 (Routine)
21 September 1931	Olathe 3E, US	daily rain	63.8 mm (2.5 in)	38.4 mm (1.5 in)	36 years	34 of 100 (Routine)
21 September 1931	Conception, US	daily rain	73.7 mm (2.9 in)	45.8 mm (1.8 in)	16 years	34 of 100 (Routine)
21 September 1931	Unionville, US	daily rain	64.8 mm (2.6 in)	45.7 mm (1.8 in)	9 years	34 of 100 (Routine)
21 September 1931	Wamego 4 W, US	daily rain	43.9 mm (1.7 in)	32.2 mm (1.3 in)	28 years	31 of 100 (Routine)
21 September 1931	Washington, US	daily rain	63.0 mm (2.5 in)	27.4 mm (1.1 in)	36 years	30 of 100 (Routine)
21 September 1931	Oregon, US	daily rain	82.0 mm (3.2 in)	49.7 mm (2.0 in)	12 years	30 of 100 (Routine)
21 September 1931	Horton, US	daily rain	81.3 mm (3.2 in)	22.9 mm (0.9 in)	36 years	29 of 100 (Routine)
21 September 1931	Genoa 2 W, US	daily rain	37.6 mm (1.5 in)	30.5 mm (1.2 in)	28 years	29 of 100 (Routine)
21 September 1931	St Albans, CA	daily rain	37.1 mm (1.5 in)	16.5 mm (0.6 in)	16 years	28 of 100 (Routine)

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 1931

Records set or tied on this calendar date in each year from 1805 to 1931. 1931 had 681 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	591
2026	478

Download the Data

Data for records on 1931-09-21: 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 20	480
20 to 40	36
40 to 60	10
60 to 80	2
80 to 100	1
100 to 120	1