Weather Records on 21 September 1919

54 weather records were set or tied worldwide on 21 September 1919. Highest significance: London South, CA.

Key Facts for 21 September 1919

On 21 September 1919, 54 weather records were set or tied at long-record stations worldwide.
22 were record highs and 6 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 1 monthly and 53 daily.
London South set a daily record precipitation of 40.6 mm (1.6 in) on 21 September 1919.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 454 records.

Record Map

54 stations

54 station records on 21 September 1919 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1919: highest significance records shown on the map
Station	Country	Type	Value	Significance
London South	Canada	Record daily precipitation	40.6 mm (1.6 in)	43 of 100 (Notable)
Watford	Canada	Record daily precipitation	44.5 mm (1.8 in)	34 of 100 (Routine)
Port Stanley	Canada	Record daily precipitation	42.2 mm (1.7 in)	34 of 100 (Routine)
Stratford	Canada	Record daily precipitation	30.2 mm (1.2 in)	31 of 100 (Routine)
Woodstock	Canada	Record daily precipitation	41.1 mm (1.6 in)	31 of 100 (Routine)
Alma	United States	Record daily precipitation	38.9 mm (1.5 in)	30 of 100 (Routine)
Hamilton	Canada	Record high minimum temperature	18.3 C (64.9 F)	23 of 100 (Routine)
Allegan 1	United States	Record daily precipitation	35.6 mm (1.4 in)	21 of 100 (Routine)
Southampton	Canada	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Oran-Hopital Militaire	Algeria	Record daily precipitation	24.0 mm (0.9 in)	20 of 100 (Routine)
Algiers-Ville/Universite	Algeria	Record daily precipitation	22.7 mm (0.9 in)	20 of 100 (Routine)
Algiers-Ville/Universite	Algeria	Record low maximum temperature	21.0 C (69.8 F)	20 of 100 (Routine)
Georgetown	Canada	Record daily precipitation	17.5 mm (0.7 in)	20 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record daily precipitation	11.5 mm (0.5 in)	20 of 100 (Routine)
Brantford	Canada	Record daily precipitation	22.9 mm (0.9 in)	19 of 100 (Routine)
Paris	Canada	Record daily precipitation	24.1 mm (0.9 in)	19 of 100 (Routine)
Toledo Blade	United States	Record daily precipitation	17.5 mm (0.7 in)	19 of 100 (Routine)
Montreal McGill	Canada	Record daily precipitation	15.2 mm (0.6 in)	17 of 100 (Routine)
Chatham	Canada	Record high minimum temperature	16.1 C (61.0 F)	17 of 100 (Routine)
Gravenhurst	Canada	Record daily precipitation	17.3 mm (0.7 in)	16 of 100 (Routine)
Haliburton A	Canada	Record high minimum temperature	17.2 C (63.0 F)	15 of 100 (Routine)
Sacramento 5 ESE	United States	Record high minimum temperature	18.9 C (66.0 F)	15 of 100 (Routine)
Kardella (Fleetwood)	Australia	Record daily precipitation	17.3 mm (0.7 in)	14 of 100 (Routine)
Hoorn	Netherlands	Record daily precipitation	16.9 mm (0.7 in)	14 of 100 (Routine)
Nemours (Ghazaouet)	Algeria	Record high minimum temperature	22.0 C (71.6 F)	13 of 100 (Routine)
Gravenhurst	Canada	Record high minimum temperature	17.8 C (64.0 F)	13 of 100 (Routine)
Yarmouth	Canada	Record high minimum temperature	14.4 C (57.9 F)	13 of 100 (Routine)
Nordby (Fano)	Denmark	Record daily precipitation	11.7 mm (0.5 in)	13 of 100 (Routine)
Bamberg	Germany	Record low maximum temperature	9.8 C (49.6 F)	13 of 100 (Routine)
Weissenburg	Germany	Record low maximum temperature	9.2 C (48.6 F)	13 of 100 (Routine)
Northfield	United States	Record high minimum temperature	16.7 C (62.1 F)	13 of 100 (Routine)
Houston Wb City	United States	Record high minimum temperature	24.4 C (75.9 F)	13 of 100 (Routine)
Woodstock	Canada	Record high minimum temperature	17.8 C (64.0 F)	12 of 100 (Routine)
Oudenbosch	Netherlands	Record daily precipitation	13.6 mm (0.5 in)	12 of 100 (Routine)
London South	Canada	Record high minimum temperature	18.3 C (64.9 F)	10 of 100 (Routine)
Chattanooga Wb City	United States	Record high minimum temperature	21.7 C (71.1 F)	10 of 100 (Routine)
Welland	Canada	Record daily precipitation	13.2 mm (0.5 in)	9 of 100 (Routine)
Guelph Oac	Canada	Record high minimum temperature	17.8 C (64.0 F)	9 of 100 (Routine)
Morgantown 1	United States	Record high minimum temperature	20.6 C (69.1 F)	9 of 100 (Routine)
Kingston Queens U	Canada	Record high maximum temperature	27.2 C (81.0 F)	8 of 100 (Routine)
Ottawa	Canada	Record high maximum temperature	29.4 C (84.9 F)	7 of 100 (Routine)
Hamilton	Canada	Record daily precipitation	15.2 mm (0.6 in)	7 of 100 (Routine)
Saentis	Switzerland	Record low minimum temperature	-8.6 C (16.5 F)	7 of 100 (Routine)
Port Dover	Canada	Record daily precipitation	7.4 mm (0.29 in)	6 of 100 (Routine)
Plauen	Germany	Record low maximum temperature	7.7 C (45.9 F)	6 of 100 (Routine)
Kiev	Ukraine	Record high maximum temperature	25.8 C (78.4 F)	6 of 100 (Routine)
Pointe Au Pere	Canada	Record high maximum temperature	27.8 C (82.0 F)	5 of 100 (Routine)
Altastenberg	Germany	Record low minimum temperature	-0.1 C (31.8 F)	4 of 100 (Routine)
Constantine	Algeria	Record daily precipitation	4.0 mm (0.16 in)	3 of 100 (Routine)
Sacramento 5 ESE	United States	Record high maximum temperature	36.7 C (98.1 F)	3 of 100 (Routine)
Washington	United States	Record high minimum temperature	21.1 C (70.0 F)	3 of 100 (Routine)
Jacksonville Wb City	United States	Record high minimum temperature	24.4 C (75.9 F)	3 of 100 (Routine)
Lexington Bluegrass AP	United States	Record high minimum temperature	21.1 C (70.0 F)	2 of 100 (Routine)
Haliburton A	Canada	Record daily precipitation	27.9 mm (1.1 in)	0 of 100 (Routine)

Counts by Type and Timescale

54 records

Records set or tied on 21 September 1919 by type: Highest daily maximum 5, Lowest daily maximum 4, Highest daily minimum 17, Lowest daily minimum 2, Heaviest daily rainfall 26.

Records on 21 September 1919 by type
Record type	Records
Highest daily maximum	5
Lowest daily maximum	4
Highest daily minimum	17
Lowest daily minimum	2
Heaviest daily rainfall	26
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 September 1919 by timescale: all-time 0, monthly 1, daily 53.

How Much Records Were Beaten By

47 broken records

Margins by which the 47 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 32.7. Ties are not counted.

Top 20 by Significance

21 September 1919

Top 20 records on 21 September 1919 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1919	London South, CA	daily rain	40.6 mm (1.6 in)	32.7 mm (1.3 in)	4 years	43 of 100 (Notable)
21 September 1919	Watford, CA	daily rain	44.5 mm (1.8 in)	30.8 mm (1.2 in)	0 years	34 of 100 (Routine)
21 September 1919	Port Stanley, CA	daily rain	42.2 mm (1.7 in)	16.3 mm (0.6 in)	35 years	34 of 100 (Routine)
21 September 1919	Stratford, CA	daily rain	30.2 mm (1.2 in)	12.7 mm (0.5 in)	52 years	31 of 100 (Routine)
21 September 1919	Woodstock, CA	daily rain	41.1 mm (1.6 in)	16.0 mm (0.6 in)	36 years	31 of 100 (Routine)
21 September 1919	Alma, US	daily rain	38.9 mm (1.5 in)	24.4 mm (1.0 in)	26 years	30 of 100 (Routine)
21 September 1919	Hamilton, CA	daily high min	18.3 C (64.9 F)	2.2 C (4.0 F)	49 years	23 of 100 (Routine)
21 September 1919	Allegan 1, US	daily rain	35.6 mm (1.4 in)	20.1 mm (0.8 in)	5 years	21 of 100 (Routine)
21 September 1919	Southampton, CA	daily rain	16.5 mm (0.6 in)	7.4 mm (0.29 in)	35 years	20 of 100 (Routine)
21 September 1919	Oran-Hopital Militaire, DZ	daily rain	24.0 mm (0.9 in)	1.2 mm (0.05 in)	51 years	20 of 100 (Routine)
21 September 1919	Algiers-Ville/Universite, DZ	daily rain	22.7 mm (0.9 in)	14.0 mm (0.6 in)	8 years	20 of 100 (Routine)
21 September 1919	Algiers-Ville/Universite, DZ	daily low max	21.0 C (69.8 F)	3.5 C (6.3 F)	21 years	20 of 100 (Routine)
21 September 1919	Georgetown, CA	daily rain	17.5 mm (0.7 in)	8.9 mm (0.35 in)	22 years	20 of 100 (Routine)
21 September 1919	Kvikkjokk-Arrenjarka, SE	daily rain	11.5 mm (0.5 in)	4.9 mm (0.19 in)	24 years	20 of 100 (Routine)
21 September 1919	Brantford, CA	daily rain	22.9 mm (0.9 in)	9.4 mm (0.37 in)	18 years	19 of 100 (Routine)
21 September 1919	Paris, CA	daily rain	24.1 mm (0.9 in)	12.4 mm (0.5 in)	5 years	19 of 100 (Routine)
21 September 1919	Toledo Blade, US	daily rain	17.5 mm (0.7 in)	5.3 mm (0.21 in)	36 years	19 of 100 (Routine)
21 September 1919	Montreal McGill, CA	daily rain	15.2 mm (0.6 in)	5.0 mm (0.20 in)	29 years	17 of 100 (Routine)
21 September 1919	Chatham, CA	daily high min	16.1 C (61.0 F)	0.5 C (0.9 F)	40 years	17 of 100 (Routine)
21 September 1919	Gravenhurst, CA	daily rain	17.3 mm (0.7 in)	7.4 mm (0.29 in)	18 years	16 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 1919

Records set or tied on this calendar date in each year from 1805 to 1919. 1919 had 54 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 1919-09-21: 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 5	31
5 to 10	7
10 to 15	3
15 to 20	2
20 to 25	2
25 to 30	0
30 to 35	2