Weather Records on 21 September 1947

534 weather records were set or tied worldwide on 21 September 1947. Highest significance: Dixon Wwtp, US.

Key Facts for 21 September 1947

On 21 September 1947, 534 weather records were set or tied at long-record stations worldwide.
178 were record highs and 55 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 28 monthly and 504 daily.
Dixon Wwtp set a daily record precipitation of 95.3 mm (3.8 in) on 21 September 1947.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 450 records.

Record Map

534 stations

534 station records on 21 September 1947 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1947: highest significance records shown on the map
Station	Country	Type	Value	Significance
Dixon Wwtp	United States	Record daily precipitation	95.3 mm (3.8 in)	61 of 100 (Major)
Garnett 1 E	United States	Record daily precipitation	153.4 mm (6.0 in)	60 of 100 (Major)
Gladwin	United States	Record daily precipitation	61.0 mm (2.4 in)	60 of 100 (Major)
Galva	United States	Record daily precipitation	76.2 mm (3.0 in)	53 of 100 (Notable)
La Harpe	United States	Record daily precipitation	110.2 mm (4.3 in)	53 of 100 (Notable)
Harrisville	United States	Record daily precipitation	51.6 mm (2.0 in)	53 of 100 (Notable)
Midland 2	United States	Record daily precipitation	55.4 mm (2.2 in)	53 of 100 (Notable)
Harrison 1 NNW	United States	Record daily precipitation	50.8 mm (2.0 in)	52 of 100 (Notable)
Burlington Muni AP	United States	Record daily precipitation	97.0 mm (3.8 in)	52 of 100 (Notable)
Elgin Water	United States	Record daily precipitation	81.8 mm (3.2 in)	51 of 100 (Notable)
Clinton #1	United States	Record daily precipitation	92.7 mm (3.6 in)	50 of 100 (Notable)
Grayling	United States	Record daily precipitation	61.0 mm (2.4 in)	50 of 100 (Notable)
S Haven	United States	Record daily precipitation	71.9 mm (2.8 in)	50 of 100 (Notable)
East Lansing Exp Farm	United States	Record daily precipitation	51.3 mm (2.0 in)	49 of 100 (Notable)
Macon	United States	Record daily precipitation	116.8 mm (4.6 in)	49 of 100 (Notable)
Galesburg	United States	Record daily precipitation	97.8 mm (3.9 in)	48 of 100 (Notable)
Geneseo	United States	Record daily precipitation	111.0 mm (4.4 in)	48 of 100 (Notable)
Monmouth	United States	Record daily precipitation	113.0 mm (4.4 in)	48 of 100 (Notable)
Morrison	United States	Record daily precipitation	94.2 mm (3.7 in)	48 of 100 (Notable)
Walnut	United States	Record daily precipitation	99.3 mm (3.9 in)	48 of 100 (Notable)
Wapello	United States	Record daily precipitation	120.7 mm (4.8 in)	48 of 100 (Notable)
Ft Scott	United States	Record daily precipitation	99.1 mm (3.9 in)	48 of 100 (Notable)
Pleasanton	United States	Record daily precipitation	106.4 mm (4.2 in)	48 of 100 (Notable)
Manistee 3SE	United States	Record daily precipitation	77.0 mm (3.0 in)	48 of 100 (Notable)
Harrisonville	United States	Record daily precipitation	101.1 mm (4.0 in)	48 of 100 (Notable)
Steffenville	United States	Record daily precipitation	130.3 mm (5.1 in)	48 of 100 (Notable)
Clinton 2	United States	Record daily precipitation	88.6 mm (3.5 in)	47 of 100 (Notable)
Big Rapids Wtp	United States	Record daily precipitation	53.3 mm (2.1 in)	47 of 100 (Notable)
Aurora Water	United States	Record daily precipitation	67.1 mm (2.6 in)	46 of 100 (Notable)
Stockport	United States	Record daily precipitation	76.2 mm (3.0 in)	46 of 100 (Notable)
Lawrence	United States	Record daily precipitation	84.6 mm (3.3 in)	46 of 100 (Notable)
Hastings	United States	Record daily precipitation	53.3 mm (2.1 in)	46 of 100 (Notable)
Tiskilwa 2 SE	United States	Record daily precipitation	65.0 mm (2.6 in)	45 of 100 (Notable)
Shelbina	United States	Record daily precipitation	124.0 mm (4.9 in)	45 of 100 (Notable)
Watrap	India	Record daily precipitation	71.6 mm (2.8 in)	44 of 100 (Notable)
Mt Carroll	United States	Record daily precipitation	87.9 mm (3.5 in)	44 of 100 (Notable)
Quincy Mem Brg	United States	Record daily precipitation	96.5 mm (3.8 in)	44 of 100 (Notable)
Whiting	United States	Record daily precipitation	57.7 mm (2.3 in)	44 of 100 (Notable)
Hale Loud Dam	United States	Record daily precipitation	88.9 mm (3.5 in)	44 of 100 (Notable)
Holland Wtp	United States	Record daily precipitation	72.1 mm (2.8 in)	43 of 100 (Notable)
Warrensburg 4NW	United States	Record daily precipitation	86.6 mm (3.4 in)	43 of 100 (Notable)
Joliet	United States	Record daily precipitation	63.5 mm (2.5 in)	43 of 100 (Notable)
St Catharines	Canada	Record daily precipitation	40.1 mm (1.6 in)	41 of 100 (Notable)
Boonville	United States	Record daily precipitation	78.7 mm (3.1 in)	41 of 100 (Notable)
Beloit	United States	Record daily precipitation	77.5 mm (3.1 in)	41 of 100 (Notable)
Effingham 3SW	United States	Record daily precipitation	42.7 mm (1.7 in)	40 of 100 (Notable)
Ottawa 4SW	United States	Record daily precipitation	58.4 mm (2.3 in)	40 of 100 (Notable)
Greenville 2 NNE	United States	Record daily precipitation	73.4 mm (2.9 in)	40 of 100 (Notable)
Waverly	United States	Record daily precipitation	109.7 mm (4.3 in)	40 of 100 (Notable)
Dahiwadi	India	Record daily precipitation	72.9 mm (2.9 in)	39 of 100 (Notable)
Grand Rapids Wb City	United States	Record daily precipitation	79.2 mm (3.1 in)	39 of 100 (Notable)
Hart 3 WSW	United States	Record daily precipitation	50.8 mm (2.0 in)	39 of 100 (Notable)
Racine Wwtp	United States	Record daily precipitation	78.7 mm (3.1 in)	39 of 100 (Notable)
Decatur Wtp	United States	Record daily precipitation	61.2 mm (2.4 in)	38 of 100 (Notable)
Freeport	United States	Record daily precipitation	82.6 mm (3.3 in)	38 of 100 (Notable)
Le Claire	United States	Record daily precipitation	111.5 mm (4.4 in)	38 of 100 (Notable)
Moran	United States	Record daily precipitation	58.4 mm (2.3 in)	38 of 100 (Notable)
Central Michigan UNIV	United States	Record daily precipitation	57.7 mm (2.3 in)	38 of 100 (Notable)
Lexington 3E	United States	Record daily precipitation	96.8 mm (3.8 in)	38 of 100 (Notable)
Port Washington	United States	Record daily precipitation	57.4 mm (2.3 in)	38 of 100 (Notable)

Counts by Type and Timescale

534 records

Records set or tied on 21 September 1947 by type: Highest daily maximum 72, Lowest daily maximum 21, Highest daily minimum 106, Lowest daily minimum 34, Heaviest daily rainfall 297, Heaviest daily snowfall 4.

Records on 21 September 1947 by type
Record type	Records
Highest daily maximum	72
Lowest daily maximum	21
Highest daily minimum	106
Lowest daily minimum	34
Heaviest daily rainfall	297
Heaviest daily snowfall	4
Deepest snow cover	0

Records on 21 September 1947 by timescale: all-time 2, monthly 28, daily 504.

How Much Records Were Beaten By

457 broken records

Margins by which the 457 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 95.5. Ties are not counted.

Top 20 by Significance

21 September 1947

Top 20 records on 21 September 1947 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1947	Dixon Wwtp, US	daily rain	95.3 mm (3.8 in)	59.2 mm (2.3 in)	53 years	61 of 100 (Major)
21 September 1947	Garnett 1 E, US	monthly rain	153.4 mm (6.0 in)	82.3 mm (3.2 in)	21 years	60 of 100 (Major)
21 September 1947	Gladwin, US	daily rain	61.0 mm (2.4 in)	58.7 mm (2.3 in)	52 years	60 of 100 (Major)
21 September 1947	Galva, US	daily rain	76.2 mm (3.0 in)	53.1 mm (2.1 in)	34 years	53 of 100 (Notable)
21 September 1947	La Harpe, US	daily rain	110.2 mm (4.3 in)	71.6 mm (2.8 in)	28 years	53 of 100 (Notable)
21 September 1947	Harrisville, US	daily rain	51.6 mm (2.0 in)	26.7 mm (1.1 in)	53 years	53 of 100 (Notable)
21 September 1947	Midland 2, US	daily rain	55.4 mm (2.2 in)	39.9 mm (1.6 in)	28 years	53 of 100 (Notable)
21 September 1947	Harrison 1 NNW, US	daily rain	50.8 mm (2.0 in)	33.5 mm (1.3 in)	53 years	52 of 100 (Notable)
21 September 1947	Burlington Muni AP, US	daily rain	97.0 mm (3.8 in)	64.5 mm (2.5 in)	25 years	52 of 100 (Notable)
21 September 1947	Elgin Water, US	daily rain	81.8 mm (3.2 in)	55.4 mm (2.2 in)	24 years	51 of 100 (Notable)
21 September 1947	Clinton #1, US	daily rain	92.7 mm (3.6 in)	52.8 mm (2.1 in)	53 years	50 of 100 (Notable)
21 September 1947	Grayling, US	daily rain	61.0 mm (2.4 in)	29.2 mm (1.1 in)	53 years	50 of 100 (Notable)
21 September 1947	S Haven, US	daily rain	71.9 mm (2.8 in)	44.0 mm (1.7 in)	22 years	50 of 100 (Notable)
21 September 1947	East Lansing Exp Farm, US	daily rain	51.3 mm (2.0 in)	40.6 mm (1.6 in)	22 years	49 of 100 (Notable)
21 September 1947	Macon, US	monthly rain	116.8 mm (4.6 in)	35.3 mm (1.4 in)	32 years	49 of 100 (Notable)
21 September 1947	Galesburg, US	daily rain	97.8 mm (3.9 in)	74.9 mm (2.9 in)	12 years	48 of 100 (Notable)
21 September 1947	Geneseo, US	daily rain	111.0 mm (4.4 in)	95.5 mm (3.8 in)	12 years	48 of 100 (Notable)
21 September 1947	Monmouth, US	daily rain	113.0 mm (4.4 in)	75.7 mm (3.0 in)	12 years	48 of 100 (Notable)
21 September 1947	Morrison, US	daily rain	94.2 mm (3.7 in)	60.9 mm (2.4 in)	12 years	48 of 100 (Notable)
21 September 1947	Walnut, US	daily rain	99.3 mm (3.9 in)	64.2 mm (2.5 in)	12 years	48 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 1947

Records set or tied on this calendar date in each year from 1805 to 1947. 1947 had 534 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 1947-09-21: 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	348
20 to 40	64
40 to 60	30
60 to 80	11
80 to 100	4